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Palo, Mikael
Publications (10 of 18) Show all publications
Asplund, M., Palo, M., Famurewa, S. M. & Rantatalo, M. (2016). A study of railway wheel profile parameters used as indicators of an increased risk of wheel defects (ed.). Paper presented at . Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, 230(2), 323-334
Open this publication in new window or tab >>A study of railway wheel profile parameters used as indicators of an increased risk of wheel defects
2016 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 230, no 2, p. 323-334Article in journal (Refereed) Published
Abstract [en]

The capacity demands on the railways will increase in the future, as well as the demands for a robust and available system. The availability of the railway system is dependent on the condition of the infrastructure and the rolling stock. To inspect the rolling stock and to prevent damage to the track due to faulty wheels, infrastructure managers normally install wayside monitoring systems along the track. Such systems indicate, for example, wheels that fall outside the defined safety limits and have to be removed from service to prevent further damage to the track. Due to the nature of many wayside monitoring systems, which only monitor vehicles at definite points along the track, damage may be induced on the track prior to fault detection at the location of the system. Such damage can entail capacity-consuming speed reductions and manual track inspections before the track can be opened for traffic again. The number of wheel defects must therefore be kept to a minimum. In this paper wheel profile parameters measured by a wayside wheel profile measurement system, installed along the Swedish Iron Ore Line, are examined and related to warning and alarm indications from a wheel defect detector installed on the same line. The study shows that an increased wheel wear, detectable by changes in the wheel profile parameters could be used to reduce the risk of capacity-consuming wheel defect failure events and its reactive measures.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-11827 (URN)10.1177/0954409714541953 (DOI)000368600500001 ()2-s2.0-84954348350 (Scopus ID)ad81ec6f-eb97-4226-a5fd-9b81eb39b186 (Local ID)ad81ec6f-eb97-4226-a5fd-9b81eb39b186 (Archive number)ad81ec6f-eb97-4226-a5fd-9b81eb39b186 (OAI)
Note
Validerad; 2016; Nivå 2; 20131210 (matasp)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Palo, M., Galar, D., Nordmark, T., Asplund, M. & Larsson, D. (2014). Condition monitoring at the wheel/rail interface for decision-making support (ed.). Paper presented at . Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, 228(6), 705-715
Open this publication in new window or tab >>Condition monitoring at the wheel/rail interface for decision-making support
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2014 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 228, no 6, p. 705-715Article in journal (Refereed) Published
Abstract [en]

Many railway assets, such as wheels, suffer from increasing deterioration during operation. Good condition monitoring based on good decision-making techniques can lead to accurate assessment of the current health of the wheels. This, in turn, will improve safety, facilitate maintenance planning and scheduling, and reduce maintenance costs and down-time. In this paper, wheel/rail forces are selected as a parameter (feature) for the condition monitoring of wheel health. Once wheels are properly thresholded, determining their condition can help operators to define maintenance limits for their rolling stock. In addition, if rail forces are used as condition indicators of wheel wear, it is possible to use measurement stations that cost less than ordinary profile stations. These stations are located on ordinary tracks and can provide the condition of wheelsets without causing shutdowns or slowdowns of the railway system and without interfering with railway traffic. The paper uses the iron-ore transport line in northern Sweden as a test scenario to validate the use of wheel/rail forces as indicators of wagon and wheel health. The iron-ore transport line has several monitoring systems, but in this paper only two of these systems will be used. Wheel/rail force measurements are performed on curves to see how the vehicle negotiates the curve, and wheel profile measurements are done on tangent track not far away. The vehicles investigated are iron-ore wagons with an axle load of 30 tonnes and a loaded top speed of 60 km/h. The measurements are non-intrusive, since trains are moving and assets are not damaged during the testing process

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-4829 (URN)10.1177/0954409714526164 (DOI)000340543500015 ()2-s2.0-84905442099 (Scopus ID)2d165a02-5a9c-4c65-99f6-7066c689ec39 (Local ID)2d165a02-5a9c-4c65-99f6-7066c689ec39 (Archive number)2d165a02-5a9c-4c65-99f6-7066c689ec39 (OAI)
Note
Validerad; 2014; 20140310 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Asplund, M., Palo, M., Famurewa, S. M., Rantatalo, M. & Larsson-Kråik, P.-O. (2014). Condition monitoring of rolling stock wheels: approach towards maintenance decision making (ed.). In: (Ed.), (Ed.), 27th International Congress on Condition Monitoring and Diagnostic Engineering (COMADEM 2014): 16 - 18 September 2014, Brisbane Convention and Exhibition Centre, Australia. Paper presented at International Congress on Condition Monitoring and Diagnostic Engineering Management : Implications of life cycle analysis in asset and maintenance 16/09/2014 - 18/09/2014. : COMADEM International
Open this publication in new window or tab >>Condition monitoring of rolling stock wheels: approach towards maintenance decision making
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2014 (English)In: 27th International Congress on Condition Monitoring and Diagnostic Engineering (COMADEM 2014): 16 - 18 September 2014, Brisbane Convention and Exhibition Centre, Australia, COMADEM International, 2014Conference paper, Published paper (Refereed)
Abstract [en]

Due to the more or less fixed inherent capacity of a railway system, capacity consuming events like failures within a railway network should be kept to a minimum. This could be achieved by the use of existing and new condition monitoring systems which can detect, report and predict failure events in an early stage. Demands for higher service quality, higher capacity, network availability and track quality together with less human intervention on tracks, drive the development of railway condition monitoring systems.Failure driven capacity consumption due to worn or defected rolling stock wheels have a big impact on the capacity and the infrastructure condition. Wheel defects such as out-of-round wheels, generates high forces, and could result in large capacity consumption especially for areas with cold climate conditions. Bad wheels cause even higher track wear that reduce the life length of the track. Wheels with fatigue defects could also influence the track safety issues. This paper presents how different wheel defects can be monitored; together with a review of the most common wayside condition monitoring systems on the Swedish railway network. The study also describes how the decision making process could take advantage of the condition monitoring data in order to increase the achieved network capacity.

Place, publisher, year, edition, pages
COMADEM International, 2014
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-29902 (URN)3851051c-00dc-4226-83bf-4632ef886258 (Local ID)3851051c-00dc-4226-83bf-4632ef886258 (Archive number)3851051c-00dc-4226-83bf-4632ef886258 (OAI)
Conference
International Congress on Condition Monitoring and Diagnostic Engineering Management : Implications of life cycle analysis in asset and maintenance 16/09/2014 - 18/09/2014
Note
Godkänd; 2014; 20140227 (matasp)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-06-25Bibliographically approved
Palo, M. (2014). Condition-based maintenance for effective and efficient rolling stock capacity assurance: A study on heavy haul transport in Sweden (ed.). (Doctoral dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Condition-based maintenance for effective and efficient rolling stock capacity assurance: A study on heavy haul transport in Sweden
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Driftsäker kapacitet med effektivt tillståndsbaserat underhåll för järnvägsfordon
Abstract [en]

All businesses need equipment to deliver services or manufacture goods. Over time, this equipment will degrade, but with proper maintenance, the degradation can be controlled, and failed equipment can be restored to operational status. Run-to-failure maintenance is performed when equipment or systems break down. In preventive maintenance, equipment is maintained as a precautionary measure to prevent failure. Finally, condition-based maintenance recommends maintenance actions based on the condition of the asset.The railway is a superior mode of transport if capacity, speed and environment are the main criteria; it also plays a crucial role in heavily crowded regions. The condition of the wheels and the rails affects rail- way safety, and infrastructure regulators and managers are always trying to reduce potential risk areas. The wheel-rail interface triggers most of the cost for maintenance.The railway wagons in this research use a time-based maintenance strategy, a strategy which does not fully consider the actual health of the asset. However, by using condition data from observations, along with diagnostics and prognostics, an effective condition-based maintenance strategy can be planned effectively way and executed efficiently.The results of this research suggest the efficacy of using automatic condition monitoring systems to increase the amount of available data for analysis and maintenance support planning, rather than depending on a system where operators or maintenance personnel do the measurements. The results also indicate that continuous monitoring of lateral forces will decrease the risk of derailment.Condition monitoring data can support maintenance preparation, assessment, and improvements and help to form a continuous improvement loop. This, plus a condition-based maintenance strategy, will lead to capacity assurance.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2014. p. 130
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-16943 (URN)0d89821a-7d78-40de-9428-69ed3fb114ce (Local ID)978-91-7439-825-0 (ISBN)978-91-7439-826-7 (ISBN)0d89821a-7d78-40de-9428-69ed3fb114ce (Archive number)0d89821a-7d78-40de-9428-69ed3fb114ce (OAI)
Note
Godkänd; 2014; 20131125 (mikpal); Tillkännagivande disputation 2014-01-07 Nedanstående person kommer att disputera för avläggande av teknologie doktorsexamen. Namn: Mikael Palo Ämne: Drift och underhållsteknik/Operation and Maintenance Avhandling: Condition-Based Maintenance for Effective and Efficient Rolling Stock Capacity Assurance A Study on Heavy Haul Transport in Sweden Opponent: Professor Doug Hargreaves, Science and Engineering Faculty, Queensland University of Technology, Australia Ordförande: Professor Uday Kumar, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Tid: Måndag den 3 februari 2014, kl 10.00 Plats: C305, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Asplund, M., Gustafsson, P., Nordmark, T., Rantatalo, M., Palo, M., Famurewa, S. M. & Wandt, K. (2014). Reliability and measurement accuracy of a condition monitoring system in an extreme climate: a case study of automatic laser scanning of wheel profiles (ed.). Paper presented at . Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, 228(6), 695-704
Open this publication in new window or tab >>Reliability and measurement accuracy of a condition monitoring system in an extreme climate: a case study of automatic laser scanning of wheel profiles
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2014 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 228, no 6, p. 695-704Article in journal (Refereed) Published
Abstract [en]

The Iron Ore Line (Malmbanan) is a 473 km long track section located in northern Sweden and has been in operation since 1903. This track section stretches through two countries, namely Sweden and Norway, and the main part of the track runs on the Swedish side, where the owner is the Swedish Government and the infrastructure manager is Trafikverket (the Swedish Transport Administration). The ore trains are owned and managed by the freight operator and mining company LKAB. Due to the high axle load exerted by transportation of the iron ore, 30 tonnes, and the high demand for a constant flow of ore and pellets, the track and wagons must be monitored and maintained on a regular basis. The condition of the wagon wheel is one of the most important aspects in this connection, and here the wheel profile plays an important role. For this reason an automatic laser-based wheel profile monitoring system (WPMS) has been installed on this line using a system lifecycle approach that is based on the reliability, availability, maintainability and safety (RAMS) approach for railways. The system was prepared and installed and is being operated in a collaborative project between the freight operator and infrastructure manager. The measurements are used to diagnose the condition of the wheels, and to further optimize their maintenance. This paper presents a study of the concepts and ideas of the WPMS, and the selection, installation and validation of the equipment using a system lifecycle approach that is based on RAMS for railways. Results from the profile measurements and validation are shown. The system’s reliability during performance in extreme climate conditions, with severe cold and large quantities of snow, is presented. Then the benefits, perceived challenges and acquired knowledge of the system are discussed, and an improved V-model for the lifecycle approach is presented.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-7929 (URN)10.1177/0954409714528485 (DOI)000340543500014 ()2-s2.0-84905441212 (Scopus ID)65d03b0f-3fc8-4d1a-85b2-8aa7bf544ba0 (Local ID)65d03b0f-3fc8-4d1a-85b2-8aa7bf544ba0 (Archive number)65d03b0f-3fc8-4d1a-85b2-8aa7bf544ba0 (OAI)
Note
Validerad; 2014; 20140422 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Palo, M., Lindsund, I. & Larsson-Kråik, P.-O. (2013). A case study on railway wheel maintenance management with several layers of contractors (ed.). International Journal of COMADEM, 16(4), 5-12
Open this publication in new window or tab >>A case study on railway wheel maintenance management with several layers of contractors
2013 (English)In: International Journal of COMADEM, ISSN 1363-7681, Vol. 16, no 4, p. 5-12Article in journal (Refereed) Published
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-12277 (URN)b62dff5f-c1d9-4b25-9e4f-47b0d856f84a (Local ID)b62dff5f-c1d9-4b25-9e4f-47b0d856f84a (Archive number)b62dff5f-c1d9-4b25-9e4f-47b0d856f84a (OAI)
Note

Validerad; 2013; 20131209 (mikpal)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Asplund, M., Rantatalo, M., Palo, M., Famurewa, S. M., Wandt, K., Nordmark, T. & Gustafsson, P. (2013). Automatic laser scanning of wheel profiles: condition monitoring to achieve greater capacity for existing infrastructure in an extreme climate (ed.). In: (Ed.), (Ed.), Automatic laser scanning of wheel profiles: condition monitoring to achieve greater capacity for existing infrastructure in an extreme climate. Paper presented at International Heavy Haul Association Conference : 04/02/2013 - 06/02/2013 (pp. 445-451). India: Indian Railways, the host of 10th IHHA Conferance
Open this publication in new window or tab >>Automatic laser scanning of wheel profiles: condition monitoring to achieve greater capacity for existing infrastructure in an extreme climate
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2013 (English)In: Automatic laser scanning of wheel profiles: condition monitoring to achieve greater capacity for existing infrastructure in an extreme climate, India: Indian Railways, the host of 10th IHHA Conferance , 2013, p. 445-451Conference paper, Published paper (Refereed)
Abstract [en]

The Iron Ore Line (Malmbanan) is a 473 km long track section located in northern Sweden and has been in operation since 1903. It is mainly used to transport iron ore and pellets from the mines in Kiruna and Malmberget to Narvik Harbour (Norway) in the northwest and Luleå Harbour (Sweden) in the southeast. The track section on the Swedish side is owned by the Swedish Government and managed by Trafikverket (the Swedish Transport Administration), while the ore wagons are owned and managed by the freight operator (LKAB). Due to the high axle load exerted by the iron ore transports, 30 tonnes, and the high demand for a constant ore/pellets flow, the track and wagons must be monitored and maintained on a regular basis. The condition of the wagon wheel profile is one of the most important aspects in this procedure. For this reason an automatic laser-based wheel profile monitoring system has been installed on this line. This system can automatically measure and monitor the wagon wheel profiles at speeds up to 130 km/h. The system was installed and is being operated in a collaboration project between the freight operator and infrastructure manager. The information generated is collected by the e-maintenance personnel at Luleå Railway Research Center (JVTC). The measurements will be used to diagnose the condition of the wheel and rail, and to optimize their maintenance further. This paper presents a study of the selection and the installation of the equipment. Some results from the measurements are shown. The system’s availability during performance in extreme climate conditions, with severe cold and large quantities of snow, is presented. Then the benefits and perceived challenges of the system are discussed. Some potential improvements in rail and wheel maintenance, to achieve more capacity, are analysed.

Place, publisher, year, edition, pages
India: Indian Railways, the host of 10th IHHA Conferance, 2013
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-39499 (URN)e48f007f-ffb2-4456-a79c-f45df8661f4d (Local ID)978-81-926519-1-0 (ISBN)e48f007f-ffb2-4456-a79c-f45df8661f4d (Archive number)e48f007f-ffb2-4456-a79c-f45df8661f4d (OAI)
Conference
International Heavy Haul Association Conference : 04/02/2013 - 06/02/2013
Note
Godkänd; 2013; 20131210 (matasp)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-06-25Bibliographically approved
Palo, M., Lin, J. & Larsson-Kråik, P.-O. (2013). Maintenance performance Improvement for rolling stock wheels (ed.). In: (Ed.), Enrico Zio; Piero Baraldi (Ed.), PHM2013: 2013 Prognostic and System Health Management: Milan 8-11 September 2013. Paper presented at Prognostic and System Health Management Conference : 09/09/2013 - 11/09/2013 (pp. 727-732). : AIDIC Servizi S.r.l.
Open this publication in new window or tab >>Maintenance performance Improvement for rolling stock wheels
2013 (English)In: PHM2013: 2013 Prognostic and System Health Management: Milan 8-11 September 2013 / [ed] Enrico Zio; Piero Baraldi, AIDIC Servizi S.r.l. , 2013, p. 727-732Conference paper, Published paper (Refereed)
Abstract [en]

The service life of a railway wagon wheel can be significantly reduced through failure or damage, leading to excessive costs and accelerated deterioration. In order to monitor the performance of wheels on heavy haul wagons, this paper proposes implementing the Plan, Do, Study, and Act (PDSA) maintenance performance improvement process. As a case study, it looks at wheels on the heavy haul wagons of a Swedish company, considering all factors that may influence the need for maintenance. After investigating the PDSA process, it proposes the use of Key Performance Indicators (KPIs) for both risk and economic reasons. The paper concludes that the PDSA process and KPIs are useful tools to improve the maintenance performance of railway wheels

Place, publisher, year, edition, pages
AIDIC Servizi S.r.l., 2013
Series
Chemical Engineering Transactions, ISSN 1974-9791 ; 33
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-31719 (URN)10.3303/CET1333122 (DOI)5f9fee01-efd1-4d21-aecb-84aeae2712e7 (Local ID)978-88-95608-24-2 (ISBN)5f9fee01-efd1-4d21-aecb-84aeae2712e7 (Archive number)5f9fee01-efd1-4d21-aecb-84aeae2712e7 (OAI)
Conference
Prognostic and System Health Management Conference : 09/09/2013 - 11/09/2013
Note
Validerad; 2013; 20130930 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Palo, M., Galar, D., Nordmark, T., Asplund, M. & Larsson, D. (2013). Wheel/rail condition monitoring to support rolling stock maintenance actions (ed.). In: (Ed.), (Ed.), Proceedings of 10th International Heavy Haul Association Conference: . Paper presented at International Heavy Haul Association Conference : 04/02/2013 - 06/02/2013.
Open this publication in new window or tab >>Wheel/rail condition monitoring to support rolling stock maintenance actions
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2013 (English)In: Proceedings of 10th International Heavy Haul Association Conference, 2013Conference paper, Published paper (Refereed)
Abstract [en]

Wheel/rail guidance is made possible by the shapes of wheel and rail profiles. For train operators to increase revenue and decrease cost for railway infrastructure owners they must monitor the conditions of the assets.The Iron Ore Line in northern Sweden has two different monitoring systems installed to monitor con- ditions of all passing vehicles. The wheel/rail force measurement are made in a curve to see the how the vehicle negotiate the curve, and the wheel profile measurements are done on tangent track not far away. The vehicles investigated are iron ore wagons from LKAB mining company with an axle load of 30 tonnes and a loaded top speed of 60 km/h.This study uses the condition from either wheel wear or wheel/rail forces as decision-making support for maintenance actions. A correlation between forces and wheel wear will make it possible to use this kind of force measurement stations at more places than just profile stations. This correlation will help to obtain maintenance limits for the operators to use on their rolling stock.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-38169 (URN)c7b10380-6414-4b83-bcbd-4722f4b6b78b (Local ID)c7b10380-6414-4b83-bcbd-4722f4b6b78b (Archive number)c7b10380-6414-4b83-bcbd-4722f4b6b78b (OAI)
Conference
International Heavy Haul Association Conference : 04/02/2013 - 06/02/2013
Note
Godkänd; 2013; 20130402 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Palo, M. (2012). Condition monitoring of railway vehicles: a study on wheel condition for heavy haul rolling stock (ed.). (Licentiate dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Condition monitoring of railway vehicles: a study on wheel condition for heavy haul rolling stock
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

A railway is an energy efficient mode of transport as it uses the low resistance contact between wheel and rail. This contact is not frictionless and causes wear on both surfaces. The wheel-rail guidance is made possible by the shapes of wheel and rail profiles. To increase revenue for train operators and decrease cost for railway infrastructure owners, there is a need to monitor the conditions of the assets. A major cost-driver for operators is the production loss due to wheels, especially from maintenance costs when changing and re-profiling wheels.The research in this study has been performed on the Iron Ore Line (malmbanan) in northern Sweden and Norway. Large parts of this railway line are situated north of the Arctic Circle with temperature variations from -40◦C to +25◦C and a yearly average around freezing. Running trains in this environment strains all components. The purpose of this research is to evaluate how condition-based maintenance should be implemented for railway wagons. Research methods include a literature review, interviews, and data collection and analysis. Manual wheel profile measurements have been combined with maintenance data, weather data and wheel-rail force measurements to make comparisons between seasons and wagons.The analysis shows that there are different lateral force signatures at the wheel-rail interface dependent on the wheel’s position within the bogie. It also shows the need to change both wheel sets of the bogie simultaneously. Finally, it proves there is greater wheel wear at low temperatures.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2012
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-18639 (URN)98c30abf-6154-46a7-b6f4-6d4b72113e5a (Local ID)978-91-7439-412-2 (ISBN)98c30abf-6154-46a7-b6f4-6d4b72113e5a (Archive number)98c30abf-6154-46a7-b6f4-6d4b72113e5a (OAI)
Note
Godkänd; 2012; 20120215 (mikpal); LICENTIATSEMINARIUM Ämnesområde: Drift och underhållsteknik/Operation and Maintenance Examinator: Professor Uday Kumar, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Diskutant: CI Teknisk chef Thomas Robertsson, Euromaint Rail AB, Solna Tid: Fredag den 30 mars 2012 kl 10.15 Plats: F1031, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
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