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  • 251.
    Mahmood, Yasser Ahmed
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Ahmadi, Alireza
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Karim, Ramin
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Verma, Ajint
    Stord/Haugesund University College, Haugesund.
    Fransson, Niklas
    Trafikverket.
    Comparison of frequency converter outages: a case study on Swedish TPS system2012Konferensbidrag (Refereegranskat)
    Abstract [en]

    The purpose of this paper is to survey the unavailability of the two main types of converters used in the Swedish traction power supply (TPS) system, i.e. the rotary and the static converter. The number of outages and the outage rate has been used to analyze and compare the unavailability of rotary and static converters. The mean cumulative function (MCF) has been used to analyze the number of outages and the unavailability trends, while the forced outage rate (FOR) concept has been used to analyze the outage rates. The study shows that the outages due to converter failure occur at a constant rate by calendar time at most of the converter stations, while very few stations have an increasing or a decreasing rate. It has also been found that the static converters have a higher number of outages and a higher outage rate by calendar time compared to the rotary converter types. The results of the study show that combining the number of outages and the forced outage rate gives a better view of the converters’ performance, and provides support for the maintenance decision. In fact, using one of them alone does not reflect reality. Comparing these two indexes is also helpful in identifying the areas where extra resources are needed to improve maintenance planning and where improvements can reduce the outage in the TPS system.

  • 252.
    Mahmood, Yasser Ahmed
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Ahmadi, Alireza
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Verma, Ajint
    Stord/Haugesund University College.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Fuzzy fault tree analysis: a review of concept and application2013Ingår i: International Journal of Systems Assurance Engineering and Management, ISSN 0975-6809, E-ISSN 0976-4348, Vol. 4, nr 1, s. 19-32Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fault tree analysis (FTA) is a widely used method for analyzing a system’s failure logic and calculating overall reliability. However, application of conventional FTA has some shortcomings, e.g. in handling the uncertainties, allowing the use of linguistic variables, and integrating human error in failure logic model. Hence, Fuzzy set theory has been proposed to overcome the limitation of conventional FTA. Fuzzy logic provides a framework whereby basic notions such as similarity, uncertainty and preference can be modeled effectively.The aim of this paper is to present a review of the concept of fuzzy theory with fault tree analysis and their applications since 1981, to reflect the current status of Fuzzy Fault Tree Analysis (FFTA) methodologies, their strengths, weaknesses, and their applications. This paper explains the fundamentals of fuzzy theory and describes application of fuzzy importance for using FFTA. The concept of the failure possibility and uncertainty analysis by using FFTA is discussed, and concludes with discussion on the application of FFTA in different fields. The review reveals the effectiveness of the FFTA in comparison with conventional FTA, when there is inadequate amount of accurate reliability oriented information.

  • 253.
    Mahmood, Yasser Ahmed
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Ahmadi, Alireza
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Verma, Ajit
    Karim, Ramin
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Availability and reliability performance analysis of traction frequency converters: a case study2013Ingår i: International Review of Electrical Engineering, ISSN 1827-6660, Vol. 8, nr 4, s. 1231-1242Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The frequency converter is one of the main parts of the traction power supply system (TPSS) and converts adequate traction power from the power company to the electric vehicle. In the Swedish railway network, this system comprises around 133 frequency converters with a total capacity reach of 1,295 MVA and covers around 9,543 km of electrified railway. The aim of this article is to evaluate and compare the reliability, availability and maintainability (RAM) performances of the ten models of converters used in the Swedish railway system. The key performance indicators introduced by the IEEE Std 762 methodology have been used to measure and compare the RAM performance of the converters. Moreover, the mean cumulative function (MCF) has also been used for the monitoring and comparison of the field reliability of converters versus the operating time, capacity factor and converted power. The study shows that, in general, both the static and the rotary types have a high level of availability ranging from 97%-99%. The results also show that the TGTO model (a static type) has the lowest RAM performance among all the models. In addition, it has been found that using IEEE Std 762 or the MCF alone does not always provide a complete answer. Therefore, the study suggests using both the IEEE Std 762 and the MCF methodology to arrive at a more realistic result. The study has shown that the MCF based on the capacity factor gives a good result compared with the results obtained using the MCF based on the operating time and on the converted power as a measure of the usage intensity.

  • 254.
    Markeset, T.
    et al.
    Stavanger University College.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Dimensioning of product support: issues, challenges, and opportunities2004Ingår i: 2004 proceedings: Annual Reliability and Maintainability Symposium : Los Angeles, California, USA, 26 - 29 January 2004, Piscataway, NJ: IEEE Communications Society, 2004, s. 565-570Konferensbidrag (Refereegranskat)
    Abstract [en]

    Dimensioning of product support is influenced by the product's designed-in characteristics, especially those related to RAMS. Based on a case study conducted in a manufacturing company that produces advanced automated production systems, this paper examines issues related to dimensioning of product support for advanced industrial products. The focus is mainly on the investigating engineering factors/parameters that influence product support strategy. In the case study, we examine various approaches and methods to integrate RAMS in combination with LCC in design work processes to arrive at the most cost effective product support strategy for industrial systems and components. Various aspects of product support strategies for functional products where the customer buys only the performance, not the physical product is studied and analyzed. In the conventional product scenario, the manufacturer benefits from selling support services, whilst this profit generating process becomes a cost and liability in the functional product scenario. It is concluded that the product support strategy for functional products will differ considerably compared to that for conventional products.

  • 255.
    Markeset, T.
    et al.
    University of Stavanger.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    The use of life cycle cost and profit assessment to improve operations and supply chain management performance of complex oil production facilities2005Ingår i: Proceedings of the First International Conference on Operations and Supply Chain Management: December 15-17th, 2005, Bali, Indonesia, International Conference on Operations and Supply Chain Management , 2005Konferensbidrag (Refereegranskat)
  • 256.
    Markeset, Tore
    et al.
    Stavanger University College.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Design and development of product support and maintenance concepts for industrial systems2003Ingår i: Journal of Quality in Maintenance Engineering, ISSN 1355-2511, E-ISSN 1758-7832, Vol. 9, nr 4, s. 376-392Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Product design and service delivery both affect service performance, and therefore a product support strategy must be defined during design stage, in terms of these two dimensions, to ensure the delivery of “promised product performance” to customers. Furthermore, product support strategy should not only be focused around product, or its operating characteristics, but also on assisting customers with services that enhance product use and add additional value to their business processes. This paper examines various issues such as reliability, availability, maintainability, and supportability (RAMS), etc., which directly or indirectly affect product support, maintenance needs and related costs on the basis of a case study conducted in a manufacturing company. The main purpose of the study was to analyse the critical issues related to the product support and service delivery strategy as being practised by the company, and to suggest means for improvements. On the basis of the case study, the paper presents an approach for design and development of product support and maintenance concepts for industrial systems in a multinational environment. The paper emphasizes that the strategy for product support should not be centred only on “product”, but should also take into account important issues such as the service delivery capability of the manufacturers, service suppliers, the capability of users' maintenance organization, etc.

  • 257. Markeset, Tore
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Design and development of service and maintenance concept for the mining industry2001Ingår i: Mine planning and equipment selection 2001: proceedings of the Tenth International Symposium on Mine Planning and Equipment Selection, New Delhi, India, November 19-21, 2001 / [ed] Raj K. Singhal; Bhaskar P. Singh., Enfield, NH: InderScience Publishers, 2001, s. 997-1004Konferensbidrag (Refereegranskat)
  • 258.
    Markeset, Tore
    et al.
    School of Science and Technology, Stavanger University College.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Integration of RAMS and risk analysis in product design and development work processes: case study2003Ingår i: Journal of Quality in Maintenance Engineering, ISSN 1355-2511, E-ISSN 1758-7832, Vol. 9, nr 4, s. 393-410Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Most industrial customers are looking for products that meet the functional performance needs and have predictable life cycle cost (LCC). Due to design problems and poor product support, these systems are not able to meet the customers' requirements. Major causes of customer dissatisfaction are often traced back to unexpected failures, leading to unexpected costs. However, with proper consideration of reliability, availability, maintainability and supportability (RAMS) in the design, manufacturing, and installation phases, the number of failures can be reduced and their consequences minimized. Based on a case study in a manufacturing company, an approach for integration of RAMS and risk analysis in design, development and manufacturing is presented. The importance of LCC analysis, use of feedback information, and integration of various information sources to facilitate easy RAMS implementation, in combination with risk analysis in the design phase, is discussed. An approach is suggested for integration of RAMS in the Stage Gate model for project and work process management, coordination and control, to reduce risk. A training program, developed and implemented during the study to create awareness and to improve learning and understanding of RAMS' aspects of existing and future products and processes, is also presented.

  • 259.
    Markeset, Tore
    et al.
    Stavanger University College.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Product support strategy: conventional versus functional products2005Ingår i: Journal of Quality in Maintenance Engineering, ISSN 1355-2511, E-ISSN 1758-7832, Vol. 11, nr 1, s. 53-67Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose - Most advanced durable industrial products need some kind of support to compensate for weaknesses in design or in product exploitation. Aims to examine different scenarios for product support and discusses approaches for development of product support strategy for conventional and functional products. Design/methodology/approach - The paper is based on a case study of a manufacturer of advanced durable industrial production systems. Findings - Traditionally, the customer buys, operates, and maintains equipment used in production systems. Alternatively, the customer can buy the performance, instead of the physical product. In such cases, the manufacturer is responsible for operating, maintaining, and supporting the product in addition to designing and making it. Thus, the long-term profit for both user and manufacturer will depend on the product's designed-in life cycle costs, RAMS (reliability, availability, maintainability and supportability) characteristics, as well as on the effectiveness and efficiency of the product exploitation and support processes. In general, product support is a source of income for the manufacturer. In a functional product scenario, the need for product support is a liability and a cost driver for the manufacturer. Hence, delivery of performance requires a fundamentally different approach for product support strategy. Originality/value - An examination of different scenarios and different approaches for manufacturers' product support strategies.

  • 260. Markeset, Tore
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    R&M and risk analysis tools in product design to reduce life cycle cost and improve product attractiveness2001Ingår i: 2001 proceedings: Annual Reliability and Maintainability Symposium, the International Symposium on Product Quality & Integrity, Philadelphia, Pennsylvania, USA, 2001 January 22 - 25, Piscataway, NJ: IEEE Communications Society, 2001, s. 116-122Konferensbidrag (Refereegranskat)
  • 261.
    Mohammed, Omar D.
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Rantatalo, Matti
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Aidanpää, Jan-Olov
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Vibration signal analysis for gear fault diagnosis with various crack progression scenarios2013Ingår i: Mechanical systems and signal processing, ISSN 0888-3270, E-ISSN 1096-1216, Vol. 41, nr 1-2, s. 176-195Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    There are different analytical scenarios assumed for crack propagation in the gear tooth root. This paper presents an investigation of the performance of statistical fault detection indicators (the RMS and kurtosis) for three different series of crack propagation scenarios, to compare these scenarios from a fault diagnostics point of view. These scenarios imply different forms of cracks with propagation by a certain step of crack depth. The 1st scenario assumes a crack being extended through the whole tooth width with a uniform crack depth distribution, while the 2nd scenario assumes the crack being extended through the whole tooth width with a parabolic crack depth distribution, and finally in the 3rd scenario the crack is assumed to be propagating in both the depth and the length directions simultaneously. The time-varying gear mesh stiffness has been investigated using the program code developed in the present research, and the crack propagation can be modelled with any of the presented crack propagation scenarios. Dynamic simulation has been performed to obtain the residual signals of all the studied cases for each crack propagation scenario. The comparison of the statistical indicators applied to the residual signals shows that in the 1st scenario the faults are most easily detectable, since in this scenario there is a change in the indicators implying a dramatic decrease in the gear mesh stiffness. The fault detection in the 2nd scenario is more difficult, as the crack propagates with no significant reflection on the mesh stiffness loss. The 3rd proposed scenario should receive more attention in research because it could occur in reality in case of non-uniform load distribution. However, with this scenario it is difficult to perform early fault detection, since there is a very slight change in the statistical indicators at the beginning of the crack propagation. After which, these indicators show a significant change when the crack grows deeper which implies a serious crack propagation condition.

  • 262.
    Mohammed, Omar D.
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Rantatalo, Matti
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Analytical crack propagation scenario for gear teeth and time-varying gear mesh stiffness2012Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper an analytical crack propagation scenario is proposed which assumes that a crack propagates in the tooth root in both the crack depth direction and the tooth width direction, and which is more reasonable and realistic for non-uniform load distribution cases than the other presented scenarios. An analytical approach is used for quantifying the loss of time-varying gear mesh stiffness with the presence of crack propagation in the gear tooth root. The proposed crack propagation scenario can be applied for crack propagation modelling and monitoring simulation, but further research is required for comparison and evaluation of all the presented crack propagation scenarios from the condition monitoring point of view.

  • 263.
    Morant, Amparo
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Gustafson, Anna
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Söderholm, Peter
    Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, Industriell Ekonomi.
    Larsson-Kråik, Per-Olof
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Safety and availability evaluation of railway operation based on the state of signalling systems2017Ingår i: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 231, nr 2, s. 226-238Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A framework is presented to evaluate the safety and availability of the railway operation, and quantifying the probability of the signalling system not to supervise the railway traffic. Since a failure of the signalling systems still allows operation of the railway, it is not sufficient to study their effect on the railway operation by considering only the failures and delays. The safety and availability are evaluated, handling both repairs and replacements by using a Markov model. The model is verified with a case study of Swedish railway signalling systems with different scenarios. The results show that the probability of being in a state where operation is possible in a degraded mode is greater than the probability of not being operative at all, which reduces delays but requires other risk mitigation measures to ensure safe operation. The effects that different improvements can have on the safety and availability of the railway operation are simulated. The results show that combining maintenance improvements to reduce the failure rate and increase the repair rate is more efficient at increasing the probability of being in an operative state and reducing the probability of operating in a degraded state.

  • 264.
    Morant, Amparo
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Larsson-Kråik, Per-Olof
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Data-driven model for maintenance decision support: A case study of railway signalling systems2016Ingår i: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 230, nr 1, s. 220-234Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Signalling systems ensure the safe operation of the railway network. Their reliability and maintainability directly affect the capacity and availability of the railway network, in terms of both infrastructure and trains, as a line cannot be fully operative until a failure has been repaired. The purpose of this paper is to propose a data-driven decision support model which integrates the various parameters of corrective maintenance data and to study maintenance performance by considering different RAMS parameters. This model is based on failure analysis of historical events in the form of corrective maintenance actions. It has been validated in a case study of railway signalling systems and the results are summarised. The model allows the creation of maintenance policies based on failure characteristics, as it integrates the information recorded in the various parameters of the corrective maintenance work orders. The model shows how the different failures affect the dependability of the system: the critical failures indicate the reliability of the system, the corrective actions give information about the maintainability of the components, and the relationship between the corrective maintenance times measures the efficiency of the corrective maintenance actions. All this information can be used to plan new strategies of preventive maintenance and failure diagnostics, reduce the corrective maintenance, and improve the maintenance performance.

  • 265.
    Morant, Amparo
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Wisten, Åke
    Luleå tekniska universitet, Institutionen för system- och rymdteknik.
    Galar, Diego
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Niska, Stefan
    Trafikverket.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Railway EMI impact on train operation and environment2012Ingår i: EMC Europe 2012: International Symposium on Electromagnetic Compatibillity, September 15-21, Rome, Italy, 2012Konferensbidrag (Refereegranskat)
    Abstract [en]

    Several studies in Sweden have looked into railway electromagnetic interference (EMI) either to discover the source of the interference or to determine if the equipment in the system is performing properly. The movement of rolling stock along an electrified track produces certain EMI events. Transient electromagnetic fields are produced in the signalling system when the train leaves the neutral section of the overhead power line and enters the powered section. These transient EM fields are mainly produced by the engine. The track’s infrastructure system has been tested for EMI events, but this phenomenon affects the surrounding environment as well, up to at least 10 meters from the track. The infrastructure is designed so that the return current from locomotives should go through the running rails, but occasionally the ground acts as a conductor, transmitting current to areas that are distant from the rail. The paper reviews the status of Swedish railways with respect to electromagnetic compatibility. This TREND project is a joint project with 7 FP EU.

  • 266.
    Nadakatti, Mahantesh
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Parida, Aditya
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Integrated machine health monitoring: a knowledge based approach2014Ingår i: International Journal of Systems Assurance Engineering and Management, ISSN 0975-6809, E-ISSN 0976-4348, Vol. 5, nr 3, s. 371-382Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Machine health monitoring in today's complex plant systems has gained moreprominence than ever before because of steep increase in machinery costs, plant investments and maintenance expenses. A breakdown in any one machine or a component in a plant could mean huge losses coupled with safety and environmental threats as in the case of nuclear or chemical plants. The advances in manufacturing technology and the competition in the market necessitate the continuous availability of machinery for production. This has created a need for integrating maintenance with other manufacturing activities for better plant availability and efficiency. The objective of present research work is to present one such integrated machine health monitoring (IMHM) system developed using knowledge-based systems. The proposed model can be a useful maintenance tool in majority of small and medium scale manufacturing plants. A comprehensive knowledge based system (KBS)could bedeveloped over a period of time for industrial machinery which can monitor the major machinery faults and provide expert maintenance solutions through measurement and analysis of machine parameters such as power, vibration, noise, temperature, wear debris, lubricant condition, etc. A fault diagnosis system with KBS is based on computer programs interlinking fault symptoms, faults and remedies. These solutions are based on published information about permissible machine parameters in handbooks, journals, conferences besides the past maintenance experiences and from machine expert's knowledge regarding specific machinery problem and its solution. The paper outlines possible sub-modules for IMHM along with their features.

  • 267.
    Nadakatti, Mahantesh
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik. Gogte Institute of Technology, Belgaum, India.
    Parida, Aditya
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Knowledge Based Condition Monitoring System Using Matlab2014Ingår i: Construction and Maintenance of Railway Infrastructure in Complex Environment / [ed] F. Chen; L. Gao; L.J. Wang; X.P. Cai, Bejing: China Railway Publishng House , 2014, s. 409-414Konferensbidrag (Refereegranskat)
    Abstract [en]

    There has been a steady rise in the machine health monitoring research due to increasing complexities of the industrial machinery. Cost of the machines and machine downtime effects like production loss, maintenance expenses and reduction in overall plant productivity are the areas of concern for modern manufacturing plants. Researchers are developing newer models and algorithms to overcome new issues and challenges in the machine health monitoring using various tools and techniques for both online and off-line machine conditions. The present paper proposes an off-line knowledge based application for machine health monitoring using MATLAB. The application has modules for intelligently addressing the machinery troubleshooting problems based on vibration standard, ISO 10816. The proposed application has three modules: machinery vibration troubleshooting, vibration severity criterion and induction motor troubleshooting. The application is simple to use and modify in which, the machine faults can be detected and analyzed quickly. This will reduce the machine down-time, maintenance costs, etc., and increase the plant productivity

  • 268.
    Nadakatti, Mahantesh
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Parida, Aditya
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Knowledge based systems for machine health monitoring2013Ingår i: 26th International Congress on Condition Monitoring and Diagnostic Engineering (COMADEM 2013): Helsinki, Finland, June 11 - 13, 2013 / [ed] Raj Rao B.K.N., 2013, s. 1-8Konferensbidrag (Refereegranskat)
    Abstract [en]

    The advances in manufacturing technology and the competition in the market necessitate the continuous availability of machinery for production. This has created a need for effective and efficient maintenance practices resulting in improved plant performance. Instead of the common fragmented approaches to maintenance, an integrated approach is recommended. One such approach to effective maintenance is, Knowledge Based Maintenance Systems for machine health monitoring which can be integrated with plant maintenance. A fault diagnosis system with Knowledge Based System (KBS) is based on computer programs interlinking fault symptoms, faults and remedies. A comprehensive KBS system can be developed for industrial machinery which can monitor the major machinery faults or abnormalities of the machining centres and provide expert maintenance solutions through measurement and analysis of machine health parameters such as vibration, temperature, wear debris, lubricant condition, etc. These solutions are based on published information about permissible machine parameters in handbooks, journals and conferences, past maintenance experiences and from machine expert’s knowledge regarding specific machinery problem and its solution. The objective of the present research paper is, to suggest one such system for machine health monitoring which would be a useful maintenance tool in a majority of small and medium scale manufacturing units. The KBS for machine health monitoring has modules on various aspects of machine health monitoring. Many of these sections are interactive type with easy-to-answer questions, posed by the system. Based on the user’s response and built-in knowledge base, comparisons are made by the system and appropriate maintenance solutions are suggested to the used.

  • 269.
    Nadakatti, Mahantesh
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Singh, Sarbjeet
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Parida, Aditya
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Machine health monitoring: an integrated maintenance approach2012Ingår i: Proceedings of the 2nd International Workshop & Congress on eMaintenance: Dec 12-14 Luleå, Sweden : eMaintenace: trends in technologies and methodologies, challenges, possibilities and applications / [ed] Ramin Karim; Aditya Parida; Uday Kumar, Luleå: Luleå tekniska universitet, 2012, s. 107-112Konferensbidrag (Refereegranskat)
  • 270. Niska, Stefan
    et al.
    Schunnesson, Håkan
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Measurements and analysis of electromagnetic interference in a railway signal box: a case study2011Ingår i: International Journal of Reliability, Quality and Safety Engineering (IJRQSE), ISSN 0218-5393, Vol. 18, nr 3, s. 285-303Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In general railway infrastructure operates in a complex and non homogeneous environment where low power electronics has to function in the similar environment as large voltages and currents from the trains. The environment close to the railway tracks is heavily polluted by electromagnetic (EM) noise from the railway systems itself. The reliability of the railway signalling-, communication-, and control system depends on the degree of isolation from EM noise. It is important to observe the real system and its characteristics in real situation. The complexity of the infrastructure is not easy to simulate or calculate, and therefore measurements were performed on real system in operation. A large number of measurements were made on site at signalling systems and installations of Banverket (the Swedish Rail Administration). By studying and analyzing these measurements, the extent of EMI (Electromagnetic interferences) -related faults can be estimated. In situ measurements must be performed on systems that have obvious problems show increasingly fast and high transients in a DC signalling subsystem. The statistics also show an increased activity of transients during a period before a certain circuit in this system gets out of order. The presented results clearly show how the electromagnets interference effects he signalling system in a signalling box. The measurements in this case study have provided new information on a railway subsystem and have revealed frequencies that are difficult to explain at this moment.

  • 271. Nissen, Arne
    et al.
    Helgesson, Lina
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Driftsäkerhet och underhåll: kurslitteratur för ABI 074/ABD 0042006 (uppl. Rev. utg. Version 4)Bok (Övrig (populärvetenskap, debatt, mm))
  • 272. Nissen, Arne
    et al.
    Parida, Aditya
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Condition monitoring of railway switches and crossing by using data from track recording cars2010Ingår i: International Journal of COMADEM, ISSN 1363-7681, Vol. 13, nr 3, s. 36-40Artikel i tidskrift (Refereegranskat)
  • 273. Nyström, Birre
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Analysis of train delay information2003Ingår i: Congress proceedings: 2003 WCRR, the World Congress on Railway Research : 28 September - 1 October 2003, Edinburgh International Conference Centre, Edinburgh, Scotland, UK, Edinburgh, 2003, s. 253-261Konferensbidrag (Refereegranskat)
  • 274.
    Palo, Mikael
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Schunnesson, Håkan
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Condition monitoring of rolling stock using wheel/rail forces2012Ingår i: The Ninth International Conference on Condition Monitoring and Machinery Failure Prevention Technologies, 2012, Vol. 1, s. 560-568Konferensbidrag (Refereegranskat)
    Abstract [en]

    Railway vehicles are efficient because of the low resistance in the contact zonebetween wheel and rail. In order to remain efficient both train operators and infrastructureowners need to keep rails, wheels and vehicles in acceptable condition. Wheelwear affects the dynamic characteristics of vehicles and the dynamic force impact onthe rail.The shape of the wheel profile affects the performance of railway vehicles in differentways. Wheel condition has historically been managed by identifying and removingwheels from service when they exceed an impact threshold. Condition monitoring ofrailway vehicles is mainly performed using wheel impact load detectors and truck performancedetectors. These systems use either forces or stress on the rail to interpretthe condition.This paper will show measurements taken at the research station outside Luleå innorthern Sweden. The station measures the wheel/rail forces, both lateral and vertical,at the point of contact in a curve with 484 m radius at speeds up to 100 km/h. Dataare analyzed to show differences for various wheel positions and to determine therobustness of the system.

  • 275.
    Palo, Mikael
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Schunnesson, Håkan
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Larsson-Kråik, Per-Olof
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Galar, Diego
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Rolling stock condition monitoring using wheel/rail forces2012Ingår i: Insight (Northampton), ISSN 1354-2575, E-ISSN 1754-4904, Vol. 54, nr 8, s. 451-455Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Railway vehicles are efficient because of the low resistance in the contact zone between wheel and rail. In order to remain efficient, train operators and infrastructure owners need to keep rails, wheels and vehicles in an acceptable condition. Wheel wear affects the dynamic characteristics of vehicles and the dynamic force impact on the rail. The shape of the wheel profile affects the performance of railway vehicles in different ways. Wheel condition has historically been managed by identifying and removing wheels from service when they exceed an impact threshold. Condition monitoring of railway vehicles is mainly performed using wheel impact load detectors and truck performance detectors. These systems use either forces or stress on the rail to interpret the condition. This paper will show measurements taken at the research station outside Luleå in northern Sweden. The station measures the wheel/rail forces, both lateral and vertical, at the point of contact in a curve with a 484 m radius at speeds of up to 100 km/h. Data are analysed to show differences for various wheel positions and to determine the robustness of the system.

  • 276. Parida, Aditya
    et al.
    Chattopadhyay, G.
    Faculty of Science Engineering and Health, CQ University, Gladstone Campus.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Performance measures for achieving asset productivity improvement2010Ingår i: Proceedings of the 23rd International Congress on Condition Monitoring and Diagnostic Engineering Management: COMADEM 2010, Nara, 28 June 2010 through 2 July 2010 / [ed] Susumu Okumura, Hikone: Sunrise Publishing , 2010, s. 89-94Konferensbidrag (Refereegranskat)
    Abstract [en]

    Most of the manufacturing and process industry are unable to utilize the full capacity of their engineering plant and asset. It is more relevant that industry today should focus on the asset productivity improvement for utilizing the optimized capacity of their plants and assets. Now the moot question is how to measure the asset productivity improvement, unless we measure the performance of the engineering asset. In this paper the authors have tried to discuss various issues associated with the performance measurement of the engineering asset and to identify the measures, so that it can facilitate the asset owners and managers to achieve the asset productivity improvements

  • 277. Parida, Aditya
    et al.
    Chattopadhyay, Gopi
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Multi criteria maintenance performance measurement: a conceptual model2005Ingår i: Proceedings of 18th International Congress on Condition Monitoring and Diagnostic Engineering Management: Comadem - 2005, Cranfield: Cranfield University Press , 2005, s. 349-356Konferensbidrag (Refereegranskat)
  • 278. Parida, Aditya
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Application of overall equipment effectiveness (OEE) as a process performance indicator: a case study from Kiruna mines2004Ingår i: Geomintech, Symposium on New Equipment - New Technology Management & Safety in Mines & Mineral Based Industries: ENTMS 2004, 2004, s. 32-35Konferensbidrag (Övrigt vetenskapligt)
  • 279. Parida, Aditya
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    E-maintenance: a future solution for the maintenance of mining equipments2004Ingår i: Mine Planning and Equipment Selection 2004: Proceedings of the Thirteenth International Symposium on Mine Planning and Equipment Selection, Wroclaw, Poland, 1-3 September 2004, 2004, s. 475-478Konferensbidrag (Refereegranskat)
    Abstract [en]

    Mining industry is facing unparalleled challenges with associated uncertainty in a global business scenario. These challenges have lead to the application of new technology (information and communication technology-ICT) together with innovative business approaches to reduce the overall costs, to bring about a change and savings in resources through enhanced overall equipment effectiveness (OEE). Of late many mining companies have identified maintenance as an strategic area and have brought the business focus to increase the effectiveness of maintenance processes and organisation.. The largest problems as exist in the mining industry, is a low OEE, which is 15-25 % below the target level. To improve the OEE in the mining industry, a model of collaborative e-maintenance is discussed and demonstrated in this paper. The paper also presents a framework for the development of Collaborative eMaintenance model.

  • 280. Parida, Aditya
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    e-maintenance for equipment effectiveness in mining and mineral based industry2004Ingår i: Mine Planning and Equipment Selection 2004: Proceedings of the Thirteenth International Symposium on Mine Planning and Equipment Selection, Wroclaw, Poland, 1-3 September 2004, 2004, s. 475-478Konferensbidrag (Refereegranskat)
  • 281.
    Parida, Aditya
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Integrated strategic asset performance assessment2009Ingår i: Engineering Asset Lifecycle Management: Proceedings of the 4th World Congress on Engineering Asset Management (WCEAM 2009), Ledra Marriott Hotel, Athens, 28-30 September 2009 / [ed] Dimitris Kiritsis, Brisbane: Cooperative Research Centre for Infrastructure and Engineering Asset Management , 2009, s. 25-30Konferensbidrag (Refereegranskat)
    Abstract [en]

    Asset performance assessment forms an integral part of a business process for heavy and capital intensive industry to ensure performance assurance. Managing the asset performance is critical for long term economic and business viability. Assessing the asset performance is a complex issue as it involves multiple inputs and outputs; and various stakeholders' dynamic requirements. Lack of integration among various stakeholders and their changing requirements in strategic asset performance assessment is still a problem for the companies. It is a challenge to integrate a whole organization, where free flow and transparency of information is possible; and each process is linked to integrate to achieve the company's business goals. In this paper, various issues associated with an integrated strategic asset performance assessment are discussed.

  • 282.
    Parida, Aditya
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Maintenance Performance Measurement Methods, Tools and Application2009Ingår i: Maintworld, ISSN 1798-7024, E-ISSN 1799-8670, nr 1, s. 50-53Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    For many asset-intensive industries, the costs of maintenance are a significant portion of theoperational cost. In addition, breakdowns and downtime have an impact on the plant capacity,product quality, and cost of production, as well as health, safety and the environment. To improvethe maintenance function, in any context, it is essential that its performance both from external (theimpact on customers’ business process that is the value generated for the customer) and internal(the work processes in maintenance itself and its integration with in the organization) are measured.This article analyses the issues and challenges associated with the different facets of maintenanceperformance measurement (MPM) and presents tools and methods to measure the performanceof maintenance and illustrates their applicability through simple examples.

  • 283. Parida, Aditya
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Maintenance performance measurement (MPM): issues and challenges2006Ingår i: Journal of Quality in Maintenance Engineering, ISSN 1355-2511, E-ISSN 1758-7832, Vol. 12, nr 3, s. 239-251Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose - The purpose of this study is to identify various issues and challenges associated with development and implementation of a maintenance performance measurement (MPM) system. Design/methodology/approach - An analytical approach is adopted to identify the issues and challenges associated with MPM. Findings - The study finds that for successful implementation of MPM all employees should be involved and all relevant issues need to be considered. Furthermore, the traditional overall equipment effectiveness (OEE) used by the companies is inadequate, as it only measures the internal effectiveness. For measuring the total maintenance effectiveness both internal and external effectiveness should be considered. Practical implications - What cannot be measured cannot be managed effectively. To manage maintenance process operating managers and asset owners need to measure the contribution of maintenance towards their business goals. This paper discusses issues and challenges associated with MPM system, there by helping the managers to take care of the pitfalls of the MPM system and advocates that managers should focus on measuring the total effectiveness of maintenance process. Originality/value - The paper presents a concept of total maintenance effectiveness with focus on both internal and external effectiveness, and integration of the hierarchical levels and multi-criteria maintenance performance indicators of MPM system.

  • 284. Parida, Aditya
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Maintenance productivity and performance measurement2009Ingår i: Handbook of Maintenance Management and Engineering, London: Encyclopedia of Global Archaeology/Springer Verlag, 2009, s. 17-41Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

    Maintenance productivity is one of the most important issues which govern the economics of production activities. However, productivity is often relegated to second rank, and ignored or neglected by those who influence production processes (Singh et al. 2000). Productivity in a narrow sense has been measured for several years (Andersen and Fagerhaug, 2007). Since maintenance activities are multidisciplinary in nature with a large number of inputs and outputs, the performance of maintenance productivity needs to be measured and considered holistically with an integrated approach. With increasing awareness that maintenance creates added value to the business process; organizations are treating maintenance as an integral part of their business (Liyanage and Kumar, 2003). For many asset-intensive industries, the maintenance costs are a significant portion of the operational cost. Maintenance expenditure accounts for 20-50 % of the production cost for the mining industry depending on the level of mechanization. In larger companies, reducing maintenance expenditure by $1 million contributes as much to profits as increasing sales by $3 million (Wireman, 2007). The amount spent on the maintenance budget for Europe is around 1500 billion euros per year (Altmannshopfer, 2006) and for Sweden 20 billion euros per year (Ahlmann, 2002). In open cut mining, the loss of revenue resulting from a typical dragline being out of action is US $ 0.5-1.0 million per day, and the loss of revenue from a 747 Boeing plane being out of action is roughly US $ 0.5 million per day (Murthy et al. 2002). Therefore, the importance of maintenance productivity is understood more and more by the management of the companies.

  • 285. Parida, Aditya
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Managing information is key to maintenance effectiveness2004Ingår i: Proceedings of the IMS 2004 International Conference on Intelligent Maintenance Systems, 2004Konferensbidrag (Refereegranskat)
    Abstract [en]

    Under present business scenario, maintenance is emerging as an important part of the strategic thinking of assets owners and infrastructure managers. To manage maintenance activities effectively, measurement of the maintenance performance is desired to be undertaken. Implementation of a successful maintenance performance management system essentially necessitates an effective management of all relevant maintenance related information. Managing information is important to enhance the effectiveness of maintenance process. Right information in right time facilitate easy and correct decision making. With the advent of ICT (information and communication technology), asset owners and managers are finding it easier to use information in an innovative manner to enhance maintenance effectiveness and thereby reduce the business risks related to production volume, quality and safety targets. A step taken towards implementation e-Maintenance concepts is one of such example, where the goal is to facilitate seamless flow of maintenance and production related information to meet the business goals. In this paper, we discuss the importance of information logistics with a special reference to management of maintenance process. While discussing various aspects of maintenance information system, a conceptual framework for e-Maintenance and performance measurement for maintenance effectiveness is discussed in this paper

  • 286. Parida, Aditya
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Measurement of environmental management's system effectiveness2004Ingår i: Environmental issues and waste management in energy and mineral production: proceedings of the Eight International Symposium Environmental Issues and Waste Management Energy and Mineral Production - SWEMP 2004, Kemer, Antalya, Turkey, 17-20 May 2004 / [ed] A G Paşamehmetoğlu; A Özgenoğlu; A Y Yeşilay, Ankara: Atilim Univ., , 2004, s. 33-38Konferensbidrag (Övrigt vetenskapligt)
  • 287.
    Parida, Aditya
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Strategic issues in engineering asset performance measurement management2010Konferensbidrag (Refereegranskat)
  • 288.
    Parida, Aditya
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Galar, Diego
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Stenström, Christer
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Performance measurement and management for maintenance: A literature review2015Ingår i: Journal of Quality in Maintenance Engineering, ISSN 1355-2511, E-ISSN 1758-7832, Vol. 21, nr 1, s. 2-33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose:The purpose of this paper is to provide a literature review of the performance measurement in maintenance. The authors aim to discuss the background and development of the performance measurement for maintenance, besides defining the concept of performance measures for maintenance and the frameworks developed.Design/methodology/approach:A detailed and extensive literature search and study was undertaken by the authors on the concept and definition of performance measurement, performance indicators, maintenance performance indicators and various performance frameworks. The history and theory of performance measurement over different phases of business and technological developments have been critically examined and analysed in this review paper. Findings:This paper reviews and presents the different performance indicators (PIs) and performance measurement (PM) frameworks like; balanced scorecard, performance prism, performance pyramid and performance matrix etc, and identifies their characteristics and shortcomings. After considering related issues and challenges, frameworks and approaches for the maintenance performance measurement (MPM) are also presented, where the emerging techniques like; e-maintenance have also been discussed amongst others. More and more industries are applying the balanced and integrated MPM frameworks for their competitive survivability and sustainability.Practical implications:The concept, issues and approaches considered for the MPM frameworks can be adapted by the practicing managers, while trying to define and develop an MPM framework for the operation and maintenance activities. The considerations of the advantages and limitations of different frameworks can provide insights to the managers for implementation. Originality/value:Some literature reviews on MPM and MPM frameworks are available today. This paper makes an attempt to provide a detailed and relevant literature review, besides adding value in this new and emerging area.

  • 289. Parida, Aditya
    et al.
    Phanse, Kaustubh
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    An integrated approach to design and development of e-maintenance system2004Ingår i: A fusion of harmonics: proceedings of the 3rd International Conference on Vibration Engineering and Technology of Machinery and the 4th Asia-Pacific Conference on System Integrity and Maintenance, 6 - 9 December 2004, [New Delhi] / [ed] N. S Vyas, New Dehli: Allied Publishers Ltd , 2004, s. 1141-1147Konferensbidrag (Refereegranskat)
  • 290.
    Parida, Aditya
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Stenström, Christer
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Performance Measurement for Managing Railway Infrastructure2014Ingår i: The international Journal of railway technology, ISSN 2049-5358, E-ISSN 2053-602X, Vol. 2, nr 4, s. 1-14Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An effective and efficient railway infrastructure is essential to assure assetperformance which is often measured in terms of high availability, high level ofsafety and good track quality, besides value addition. Thus, the measurement ofasset maintenance performance has become an essential element of strategicthinking for railway asset owners and managers. The area of asset maintenanceperformance is relatively new and emerging, besides its complexity with regards to the many internal and external stakeholders, all with conflicting interests. Therailway infrastructures’ overall objectives and strategies are required to be broken down through the hierarchical level, converting them into various key performance indicators (KPIs) for measurement, data collection, analysis, and decision making at appropriate levels through aggregation. This paper looks into some of the performance measurement issues of railways, and how these issues can be solved through data aggregation, analysis, simulation,and presentation. Following a discussion of these issues, a case study is carried out to demonstrate how performance can be analysed and presented.

  • 291. Parida, Aditya
    et al.
    Åhrén, Thomas
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Integrating maintenance performance with corporate balanced scorecard2003Ingår i: Condition Monitoring and Diagnostic Engineering Management: COMADEM 2003 : proceedings of the 16th International Congress, 27-29 August 2003, Växjö, Sweden / [ed] Om P. Shrivastav; Basim Al-Najjar; Raj B.K.N. Rao, Växjö: Växjö universitet , 2003, s. 53-59Konferensbidrag (Refereegranskat)
    Abstract [en]

    The concept of balanced scorecard has created a lot of interest amongst the companies and strategists since its appearance in 1992. Companies, to get a balanced view of their business strategy performance are applying it and gradually, managers are trying to use this concept for efficient management of maintenance process. It is felt that balancing the different parameters of the scorecard alone will not be able to deliver the desired expectations of the management without integration of all strategic and performance parameters of the maintenance. Therefore, an integrated approach should also be applied to business strategy management, to overcome the non-optimisation of overall equipment effectiveness.In this paper, an integrated approach is applied linking the maintenance performance indicators with the corporate balanced scorecard.

  • 292. Patra, Ambika Prasad
    et al.
    Bidhar, Sujit
    University of Tokyo.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Failure prediction of rail considering rolling contact fatigue2010Ingår i: International Journal of Reliability, Quality and Safety Engineering (IJRQSE), ISSN 0218-5393, Vol. 17, nr 3, s. 167-177Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Rolling Contact Fatigue (RCF) is a major cause of rail failure leading to replacement of rails. RCF defects are caused by a combination of high normal and tangential stresses between the wheel and rail. In this study, a methodology has been proposed to evaluate P-F (Potential failure-functional failure) interval of RCF defects based on RCF defect rate distribution and fatigue design life distribution. For estimating fatigue design life distribution, load under variable amplitude has been considered which is a case in the mixed traffic scenario. Stochastic S-N curve has been considered to account for probabilistic nature of fatigue life. The stress history can be calculated from the actual load history. RCF defect distribution can be estimated from the probability density function of the defects from the actual field data. The proper estimation of P-F interval will help the infrastructure managers to define rail inspection interval scientifically.

  • 293. Patra, Ambika Prasad
    et al.
    Bidhar, Sujit
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Reliability prediction for rail considering rolling contact fatigue2009Konferensbidrag (Refereegranskat)
    Abstract [en]

    Rolling Contact Fatigue (RCF) is a major cause of rail replacement for infrastructure managers. RCF defects are caused by a combination of high normal and tangential stresses between the wheel and rail. In this study, a methodology has been proposed to evaluate P-F (Potential failure-functional failure) interval of RCF defects based on RCF defect rate distribution and fatigue design life distribution. For estimating fatigue design life distribution, load under variable amplitude has been considered which is a case in the mixed traffic scenario. Stochastic S-N curve has been considered to account for probabilistic nature of fatigue life. The stress history can be calculated from the actual load history. RCF defect distribution can be estimated from the probability density function of the defects from the actual field data. The proper estimation of P-F interval will help the infrastructure managers to define rail inspection interval scientifically.

  • 294. Patra, Ambika Prasad
    et al.
    Dersin, Pierre
    Alstom Transport Information Solution.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Cost effective maintenance policy: a case study2010Ingår i: International Journal of Performability Engineering, ISSN 0973-1318, Vol. 6, nr 6, s. 595-603Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The European Rail Traffic Management System (ERTMS) is a major venture initiated by the European Union in order to create an interoperable railway network within Europe. The manufacturers of the ERTMS strive to attain a competitive edge by demonstrating the efficiency of their systems. Achieving the optimal cost effectiveness is one of the significant ways to address the efficiency of the system and involves maximising the availability and minimising the life cycle cost of the system over the system life cycle. One of the important ways of maximising the cost effectiveness of the system is to optimise the maintenance policy. This paper demonstrates the estimation of the cost effectiveness of an ERTMS system. The degradation and repair process of the system is modelled by Petri-Nets. Failure, maintenance and cost data are used as parameters for the model. The model will be useful for systems that experience degradations and are subjected to imperfect maintenance.

  • 295. Patra, Ambika Prasad
    et al.
    Espling, Ulla
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Life cycle cost of railway track: an overview2007Ingår i: 20th international congress on condition monitoring and diagnostic engineering management : COMADEM 2007: congress theme - machinery & process health monitoring - future trends and prospects / [ed] Ana CV Vieira; AJ Marques Cardoso; Raj BKN Rao, Coimbra: IT - Instituto de Telecommunicações , 2007, s. 407-416Konferensbidrag (Refereegranskat)
    Abstract [en]

    Several cost models have been used in the field of railway infrastructure over the years, but the usage of LCC (Life Cycle Cost) in infrastructure is quite limited. These cost models while taking decisions on maintenance and renewal actions rarely consider the whole life cycle perspective of the infrastructure. The important aspect of life cycle costing is to understand the factors that influence the LCC and the parameters that are needed to estimate it. This paper discusses the need of LCC for railway infrastructure and the current models in practice. It also discusses the cost model being followed at the Swedish National Rail Administration (Banverket) for its new investment and upgrading projects. Finally, a process for life cycle costing estimation is illustrated.

  • 296. Patra, Ambika Prasad
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Availability analysis of railway track circuits2010Ingår i: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 224, nr 3, s. 169-177Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Railways are expected to operate with ever increasing availability. The availability of railway systems and subsystems influences the overall operational availability. As the track circuit is a key component of railway signalling and control, it can contribute significantly to the loss of availability of the railway system. One way to increase the availability of the track circuit is by implementing a proper maintenance policy. In this article, Petri-nets have been used to develop models for availability analysis of the track circuit for both time-based and condition-based maintenance. A sensitivity analysis has been performed to estimate the effect of maintenance parameters on availability performance using cost-benefit analysis.

  • 297. Patra, Ambika Prasad
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Life cycle cost estimation of railway track sytem2006Ingår i: Condition Monitoring and Diagnostic Engineering Management: COMADEM 2006 ; proceedings of the 19th international congress, Luleºa, Sweden, 12 - 15 June 2006 / [ed] Uday Kumar, Luleå: Luleå tekniska universitet, 2006, s. 659-666Konferensbidrag (Refereegranskat)
    Abstract [en]

    Railway track is the most maintained component in any rail infrastructure. Study shows a lot of money has been spent annually for better maintenance of track world wide and eventually Life Cycle Cost for the track goes very high. Manufacturers and service providers for the track system are trying hard to bring down the LCC cost and at the same time keeping the risk involved to it as low as possible. It has been seen that maintenance and operation cost always takes a major share of any LCC analysis. In this paper the authors have attempted to describe the methods to reduce the operation and maintenance cost and hence optimise the LCC with low risk involved. Railway track system consists of major components like rail, turnout, crosstie etc. Each part needs equal attention in terms of maintenance and cost. In a broad sense low maintenance and operation cost always accounts for high reliability, proper maintenance planning and scheduling, proper main power allocation and low spare part cost. The current paper focuses on finding methods to life period determination of the track, proper scheduling of preventive maintenance/overhauling, man power allocation for maintenance, spare parts quantity determination for all the major parts of the railway track system. Eventually the authors have tried to develop software which will determine the above mentioned parameters and hence calculate the Life Cycle Cost for the track system. The software will also help in determining the critical component(s) in the track system which need(s) more attention as far as LCC is concerned.

  • 298. Patra, Ambika Prasad
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Larsson-Kråik, Per-Olof
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Assessment and improvement of railway track safety2009Ingår i: Special issue on heavy haul and innovative development: [the Ninth International Heavy Haul Conference (IHHA 2009) was held on 22 - 24 June in Shanghai, P.R. China], Los Angeles: Sage Publications, Incorporated , 2009, s. 91-98Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper, an approach has been developed to assess safety of the railway track by estimating the probability of derailment. Models for probability of derailment are developed based on undetected rail breaks and poor track quality using Petri-Nets and Monte Carlo simulations. The Effect of inspection intervals on lowering the probability has been analysed. The performance of the model is illustrated by an example from a track section of the iron ore line of Banverket (Swedish National Rail Administration).

  • 299. Patra, Ambika Prasad
    et al.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Larsson-Kråik, Per-Olof
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Availability target of the railway infrastructure: an analysis2010Ingår i: 2010 proceedings: Annual Reliability and Maintainability Symposium : San Jose, California, USA, 25 - 28 January 2010, Piscataway, NJ: IEEE Communications Society, 2010Konferensbidrag (Refereegranskat)
    Abstract [en]

    The railway has been accepted as one of the most environmentally friendly modes of transport for goods and passengers. However, the railway sector is striving to increase its capacity to meet the growing demand for the transport of goods and passengers with a high level of punctuality in its services. Higher availability requires the effective operation and maintenance of infrastructure, often necessitating the implementation of cost-effective preventive maintenance strategies. Therefore, a higher availability target means higher maintenance investment. However, the question of setting the availability target for the infrastructure is not easy, as it involves many influencing decision parameters, apart from a good understanding of the network configuration and traffic density. Railway networks that have a smaller number of trains and a low punctuality requirement do not require higher availability targets. The aim of this paper is to estimate the availability target for railway infrastructure based on the capacity and punctuality requirements of infrastructure managers and train operating companies. The objectives of the paper are to develop an approach to i) estimating the capacity of the infrastructure based on the design and operational characteristics and evaluating the influence of infrastructure availability on the required capacity and ii) estimating the volume of primary and secondary delay due to failures and maintenance of the infrastructure and establishing the relationship between availability and punctuality requirements. To achieve these objectives, an example is presented with parameters drawn from failure, maintenance and traffic data. Finally, a model has been developed in Petri-Nets to establish a relationship between availability, capacity and punctuality. Monte Carlo simulation is used to establish the relationship. The simulation results illustrate the effect of infrastructure availability on train delays and capacity.

  • 300.
    Patra, Ambika Prasad
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Söderholm, Peter
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Kumar, Uday
    Uncertainty estimation in railway track life-cycle cost: a case study from Swedish National Rail Administration2009Ingår i: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 223, nr 3, s. 285-293Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Life cycle cost (LCC) is used as a cost-effective decision support for maintenance of railway track infrastructure. However, a fair degree of uncertainty associated with the estimation of LCC is due to the statistical characteristics of reliability and maintainability parameters. This paper presents a methodology for estimation of uncertainty linked with LCC, by a combination of design of experiment and Monte Carlo simulation. The proposed methodology is illustrated by a case study of Banverket (Swedish National Rail Administration). The paper also includes developed maintenance cost models for track.

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