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Nyström, Birre
Publications (10 of 14) Show all publications
Nyström, B. & Söderholm, P. (2010). Selection of maintenance actions using the analytic hierarchy process (AHP): decision-making in railway infrastructure (ed.). Paper presented at . Structure and Infrastructure Engineering, 6(4), 467-479
Open this publication in new window or tab >>Selection of maintenance actions using the analytic hierarchy process (AHP): decision-making in railway infrastructure
2010 (English)In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 6, no 4, p. 467-479Article in journal (Refereed) Published
Abstract [en]

A methodology for prioritising between different maintenance actions in the railway infrastructure is presented. The consistency of the prioritisation and the feasibility of the applied methodology are investigated. Criteria describing the diverse effects of maintenance are developed and presented to track managers, together with a set of maintenance actions that are specific for each track manager. Then, the analytical hierarchy process (AHP) is used to obtain preferences for the criteria and for the different actions. The track managers roughly agree on the prioritisation of criteria. However, the discrepancies between the results of the two ways employed to elicit the preferences for the actions are rather large. The track managers consider it easy to understand the rationale of the AHP and to enter their preferences. It is proposed that preferences are recorded as they are in this paper, in order to document the rationale of the decisions and to facilitate mutual learning among decision-makers and over time.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-16080 (URN)10.1080/15732470801990209 (DOI)000277421400006 ()2-s2.0-77951635509 (Scopus ID)fa960be0-c871-11dd-941d-000ea68e967b (Local ID)fa960be0-c871-11dd-941d-000ea68e967b (Archive number)fa960be0-c871-11dd-941d-000ea68e967b (OAI)
Note
Validerad; 2010; 20081212 (yuafuq)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Niska, S., Schunnesson, H. & Nyström, B. (2009). Causes of EMC disturbance on the railway: a study of recurring faults in the signal box at Oxmyran station in Sweden (ed.). Paper presented at . International Journal of COMADEM, 12(2), 20-29
Open this publication in new window or tab >>Causes of EMC disturbance on the railway: a study of recurring faults in the signal box at Oxmyran station in Sweden
2009 (English)In: International Journal of COMADEM, ISSN 1363-7681, Vol. 12, no 2, p. 20-29Article in journal (Refereed) Published
Abstract [en]

Failure reporting systems in the railway industry are reliant on correct reporting into the system, so that the right information may be send back to the user. This information is needed for correct decision-making in the maintenance process. For failure due to electromagnetic disturbance a correct classification can be very difficult to make in the field, with limited time available for the analysis of failure causes. The Swedish Railway Administration (Banverket) has a problem in a signal box at Oxmyran Station, where faults are reported frequently. The wide variation in the reported causes of the disturbance of the electromagnetic compatibility makes it very difficult to pinpoint the real causes of the events that lead to failure. In this paper, a large number of causes are investigated, discussed and dismissed as reasons for the large number of faults at Oxmyran. Measurements on site, however, show that the electromagnetic interference is much higher at Oxmyran than at the reference station at Ore Alv. The main purpose of this study was to investigate the probable source and the subsequent sequence of events that result in faults that break the RC circuit at Oxmyran.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-6208 (URN)467ce190-c86e-11dd-941d-000ea68e967b (Local ID)467ce190-c86e-11dd-941d-000ea68e967b (Archive number)467ce190-c86e-11dd-941d-000ea68e967b (OAI)
Note
Validerad; 2009; 20081212 (yuafuq)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Söderholm, P. & Nyström, B. (2009). The analytic hierarchy process (AHP) for decision-making and expert judgement in railway infrastructure maintenance (ed.). In: (Ed.), IRSC 2009, Båstad, Sweden: . Paper presented at International Railway Safety Conference : 28/09/2009 - 02/10/2009.
Open this publication in new window or tab >>The analytic hierarchy process (AHP) for decision-making and expert judgement in railway infrastructure maintenance
2009 (English)In: IRSC 2009, Båstad, Sweden, 2009Conference paper, Published paper (Refereed)
Abstract [en]

Decision-making and expert judgement are two vital parts within safety and risk management, e.g. regarding: analyses of frequencies and consequences in risk analysis; risk tolerability decisions in risk evaluation and decision-making in risk reduction and control. There are a number of formal methodologies to elicit expert judgement and support decision-making. These methodologies contribute to inter-subjectivity, transparency and traceability of performed judgements and decisions, which in turn support continuous improvement and risk reduction. Examples of these methodologies are: Delphi methodology; paired comparison; category ranking and absolute probability judgements. This paper describes an application of the Analytic Hierarchy Process (AHP) to obtain preferences for strategic railway infrastructure criteria, such as safety and punctuality, and for different infrastructure maintenance actions from track managers in Sweden. The application of the AHP methodology was supported by a software tool, which facilitated recording, calculation and presentation of the track managers' preferences. The track managers consider it easy to understand the rationale of the AHP and to enter their preferences with the aid of a computer and the software tool. It is proposed that the preferences are recorded as in this paper, to document the rationale of performed decisions and to facilitate mutual learning among decision-makers and over time.

National Category
Reliability and Maintenance Other Civil Engineering
Research subject
Quality Technology and Management; Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-30535 (URN)461d4b70-6569-11de-9f57-000ea68e967b (Local ID)461d4b70-6569-11de-9f57-000ea68e967b (Archive number)461d4b70-6569-11de-9f57-000ea68e967b (OAI)
Conference
International Railway Safety Conference : 28/09/2009 - 02/10/2009
Note

Godkänd; 2009; 20090630 (peter_s)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-16Bibliographically approved
Nyström, B. (2009). Use of availability concepts in the railway system (ed.). International Journal of Pedagogy, Innovation and New Technologies, 5(2), 103-118
Open this publication in new window or tab >>Use of availability concepts in the railway system
2009 (English)In: International Journal of Pedagogy, Innovation and New Technologies, ISSN 0973-1318, E-ISSN 2392-0092, Vol. 5, no 2, p. 103-118Article in journal (Refereed) Published
Abstract [en]

This paper explores and describes indicators related to availability in the railway system. Examples of indicators include train punctuality and condition of track. The paper presents losses to the stakeholders, measured by the indicators. Indicators in Banverket (Swedish Rail Administration) and railway literature are presented. Indicators used in the electric power industry are also presented, as these offer good analogies from which to develop additional railway indicators. The indicators found in the literature, but not in Banverket, include travel time variation, slack and wagons. Indicators found by analogy to the power industry concern passengers, traffic work not delivered and how to subtract the effects of adverse weather. A classification of availability indicators is also suggested.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-9425 (URN)809fae10-cc3e-11dd-99d1-000ea68e967b (Local ID)809fae10-cc3e-11dd-99d1-000ea68e967b (Archive number)809fae10-cc3e-11dd-99d1-000ea68e967b (OAI)
Note

Validerad; 2009; 20081217 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-13Bibliographically approved
Nyström, B. (2008). A methodology for measuring the quality of deviation reporting: applied to railway delay attribution (ed.). International Journal of Quality & Reliability Management, 25(7), 656-673
Open this publication in new window or tab >>A methodology for measuring the quality of deviation reporting: applied to railway delay attribution
2008 (English)In: International Journal of Quality & Reliability Management, ISSN 0265-671X, E-ISSN 1758-6682, Vol. 25, no 7, p. 656-673Article in journal (Refereed) Published
Abstract [en]

Purpose - The purpose of this paper is to describe a methodology based on vignettes and its application to measure the consistency of railway delay attribution, in order to report on experiences of using the methodology in this context. Design/methodology/approach - A survey is used to ask personnel performing delay attribution about how they would report the delays described in the vignettes of the survey. The development, application and analysis of the survey are thoroughly described here. Findings - The methodology proved useful for measuring the consistency of delay attribution. Research limitations/implications - The methodology also supports a further investigation of the accuracy of delay attribution systems. Practical implications - A survey similar to the one presented here can be used by railways to estimate the accuracy of their delay attribution systems, as well as to continuously improve them. Changes to computer software and training will improve the delay attribution system under study. Originality/value - By investigating current delay attribution practices using surveys based on vignettes, drawbacks of the current delay attribution system can be identified and remedied. The methodology is applicable to a wide class of deviation attribution applications.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-13314 (URN)10.1108/02656710810890863 (DOI)2-s2.0-49149089249 (Scopus ID)c86262f0-734d-11dd-a60f-000ea68e967b (Local ID)c86262f0-734d-11dd-a60f-000ea68e967b (Archive number)c86262f0-734d-11dd-a60f-000ea68e967b (OAI)
Note

Validerad; 2008; 20080826 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Nyström, B. (2008). Aspects of improving punctuality: from data to decision in railway maintenance (ed.). (Doctoral dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Aspects of improving punctuality: from data to decision in railway maintenance
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The increasing demand for transportation and sustainability makes railways attractive. The ongoing deregulation of state-owned railways means that many new organisations are entering the railway sector. Hence, reducing railway delays is increasingly important to many stakeholders, including passengers, freight customers, train operating companies, railway infrastructure managers and society in general. Therefore, the study of punctuality and its improvement is essential. The purpose of the research presented in this thesis is to explore and describe information and requirements related to railway punctuality in order to support systematic improvements. The focus is on delay causes related to infrastructure maintenance. To fulfil the stated purpose, punctuality requirements, availability concepts, failure and delay data, as well as maintenance decisions, have been studied via theoretical and empirical approaches. Data was collected through interviews, document studies, archival analysis, observations and experiments. It is found that punctuality requirements and performance are currently expressed in many, hardly commensurable, ways. Hence, it is difficult to compare punctuality data from different railways. This is further complicated by the fact that delay attribution is inconsistently performed. It is also found that there is a lack of data on train traffic and infrastructure, for example, causes of delays. Although the consistency regarding ranking of decision-making criteria is rather high, the consistency of maintenance decisions is rather low. In addition, there are many interacting causes affecting punctuality, including infrastructure, timetable, rolling stock, weather and personnel. It is also found that even though unpunctuality might be explained by unavailability of some parts of the railway system, the concept of availability is not well-established and agreed upon within the railway sector. Based on the research findings, it is proposed that punctuality should be treated as the extent to which an event takes place when agreed, for example, the agreement between a passenger and a train operating company concerning the arrival of a train at a certain time. A number of availability measures for railway are also proposed, partly based on analogies to the power industry. Furthermore, the developed and applied methodologies, based on vignettes and the Analytic Hierarchy Process (AHP), are proposed to support punctuality improvements. To summarise, based on the results of this research, it is possible to improve data collection and recording, select suitable indicators and increase the awareness of the grounds on which decisions are made, all of which contribute to improved punctuality.

Abstract [sv]

Den ökande efterfrågan på transporter, helst med låg miljöbelastning, gör järnvägen till ett attraktivt alternativ. I den pågående omregleringen av statliga järnvägar gör många nya aktörer entré i branschen. Att minska järnvägsförseningarna blir allt viktigare för många intressenter, som passagerare, godskunder, tågoperatörer, infrastrukturförvaltare och samhället i stort. Därför är det mycket viktigt att studera de faktorer som påverkar punktligheten.Syftet med forskningen som presenteras i denna avhandling är att undersöka och beskriva information och krav relaterade till punktlighet, i syfte att stödja systematiskt förbättringsarbete. Fokus ligger på förseningsorsaker relaterade till infrastrukturunderhåll. För att uppfylla syftet har punktlighetskrav, tillgänglighetskoncept, data för fel och förseningar, liksom underhållsbeslut, studerats teoretiskt och empiriskt. Datainsamling har skett med intervjuer, dokumentstudier, arkivmaterial, observationer och experiment.I avhandlingen visas att punktlighetsprestation och -krav idag uttrycks på många, knappast jämförbara, sätt. Således är det svårt att jämföra punktlighetsdata, eftersom olika järnvägar presenterar punktlighet på skilda sätt. Detta försvåras dessutom av att förseningsrapporteringen utförs inkonsistent. Det visas också att det saknas data om tågtrafik och infrastruktur som skulle kunna underlätta för förbättringar, även beträffande förseningsorsaker. Även om konsistensen för rangordning av kriterierna för beslutsfattande är god, är konsistensen för underhållsbeslut ganska låg. Dessutom påverkar många interagerande faktorer punktligheten, till exempel infrastruktur, tidtabell, rullande materiel, väder och personal. Det visas också att trots att opunktlighet kan förklaras av otillgänglighet hos enheter i järnvägssystemet, så saknar järnvägssektorn ett allmänt accepterat tillgänglighetsbegrepp.Baserat på forskningsresultaten föreslås att punktlighet definieras som i vilken utsträckning en händelse äger rum när det är överenskommet, till exempel överenskommelsen mellan en passagerare och en tågoperatör beträffande händelsen att ett tåg ankommer vid en viss tidpunkt. Ett antal tillgänglighetsmått för järnvägen föreslås också, delvis baserade på analogier med elkraftsindustrin. De arbetssätt som utvecklats och tillämpats, baserade på scenarier och AHP (Analytic Hierarchy Process), föreslås användas för att stödja punktlighetsförbättringar.Sammanfattningsvis, baserat på resultaten av denna forskning, är det möjligt att förbättra datainsamlingen och registreringen, välja lämpliga indikatorer och öka medvetenheten om använda beslutsgrunder, vilket bidrar till förbättrad punktlighet.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2008. p. 101
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544 ; 2008:11
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-26620 (URN)f3f1af80-f1a6-11dc-ba03-000ea68e967b (Local ID)f3f1af80-f1a6-11dc-ba03-000ea68e967b (Archive number)f3f1af80-f1a6-11dc-ba03-000ea68e967b (OAI)
Note

Godkänd; 2008; Bibliografisk uppgift: Förbättrad punktlighet : från data till beslut i järnvägsunderhåll; 20080314 (ysko)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-13Bibliographically approved
Nyström, B. & Karlsson, S. (2006). Description of railway delays: a study from the views of the stakeholders (ed.). In: (Ed.), Uday Kumar (Ed.), Condition Monitoring and Diagnostic Engineering Management: COMADEM 2006 ; proceedings of the 19th international congress, Luleºa, Sweden, 12 - 15 June 2006. Paper presented at International Congress on Condition Monitoring and Diagnostic Engineering Management : 12/06/2006 - 15/06/2006 (pp. 701-710). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Description of railway delays: a study from the views of the stakeholders
2006 (English)In: 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, p. 701-710Conference paper, Published paper (Refereed)
Abstract [en]

The wish to improve quality of railway transport is facilitated by systematic feedback. Systematically describing delays and their causes is essential in improving punctuality. In this paper, requirements on a delay attribution system are discussed and analysed, in view of the current restructuring of the Swedish system. A freight train operating company, a p assenger train company and a maintenance contractor are interviewed in order to learn what features are considered important by them. Principles of delay attribution systems are discussed and suggestions for improvements are given.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2006
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-30582 (URN)46fe30e0-c269-11db-9ea3-000ea68e967b (Local ID)978-91-631-8806-0 (ISBN)46fe30e0-c269-11db-9ea3-000ea68e967b (Archive number)46fe30e0-c269-11db-9ea3-000ea68e967b (OAI)
Conference
International Congress on Condition Monitoring and Diagnostic Engineering Management : 12/06/2006 - 15/06/2006
Note

Godkänd; 2006; 20070102 (ysko)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-19Bibliographically approved
Nyström, B. (2006). Enkät om rapportering av förseningar (ed.). Paper presented at .
Open this publication in new window or tab >>Enkät om rapportering av förseningar
2006 (Swedish)Report (Other academic)
Abstract [sv]

Dessa fyra olika versioner av en enkät om rapportering av förseningar ingår i projektet "Bättre punktlighet genom effektivt underhåll". De är avsedda att fyllas i av personal som rapporterar förseningar inom tågtrafiken med programmen TFÖR och/eller Basun.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-24358 (URN)aa1d46f0-a72b-11dc-9534-000ea68e967b (Local ID)aa1d46f0-a72b-11dc-9534-000ea68e967b (Archive number)aa1d46f0-a72b-11dc-9534-000ea68e967b (OAI)
Note

Godkänd; 2006; 20071210 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-13Bibliographically approved
Nyström, B. (2005). Improved punctuality: a freight train study (ed.). In: (Ed.), M. C. Forde (Ed.), Abstracts of the Eighth International Conference "Maintenance & Renewal of Permanent Way; Power & Signalling; Structures & Earthworks": Railway engineering 2005. Paper presented at International Conference on Maintenance and Renewal of Permanent Way : Power and Signalling; Structures and Earthworks 29/06/2005 - 30/06/2005 (pp. 19). : Engineering Technics Press
Open this publication in new window or tab >>Improved punctuality: a freight train study
2005 (English)In: Abstracts of the Eighth International Conference "Maintenance & Renewal of Permanent Way; Power & Signalling; Structures & Earthworks": Railway engineering 2005 / [ed] M. C. Forde, Engineering Technics Press , 2005, p. 19-Conference paper, Meeting abstract (Other academic)
Abstract [en]

A procedure to systematically find actions to improve punctuality concerning railway infrastructure, and giving the greatest improvement is illustrated. The transports of a company producing steel slabs in one factory and performing rolling in another are investigated. Reliable transports between plants are crucial to market competitiveness. The transport chain of steel slabs is described and the distance by train is investigated regarding punctuality, transportation times and causes for lack of punctuality. Pros and cons of the procedure employed and ways to improve punctuality are discussed, including infrastructure maintenance.

Place, publisher, year, edition, pages
Engineering Technics Press, 2005
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-29870 (URN)37cc8020-023a-11dc-ad0a-000ea68e967b (Local ID)0-947644-57-1 (ISBN)37cc8020-023a-11dc-ad0a-000ea68e967b (Archive number)37cc8020-023a-11dc-ad0a-000ea68e967b (OAI)
Conference
International Conference on Maintenance and Renewal of Permanent Way : Power and Signalling; Structures and Earthworks 29/06/2005 - 30/06/2005
Note
Godkänd; 2005; Bibliografisk uppgift: CD-ROM; 20070514 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Nyström, B. & Söderholm, P. (2005). Improved railway punctuality by effective maintenance: a case study (ed.). In: (Ed.), Krzysztof Kolowrocki (Ed.), Advances in Safety and Reliability: proceedings of the European Safety and Reliability Conference (ESREL 2005), Tri City (Gdynia - Sopot - Gdansk), Poland, 27 - 30 June, 2005. Paper presented at European Safety and Reliability Conference : 27/06/2005 - 30/06/2005 (pp. 1487-1491). Leiden: Balkema Publishers, A.A. / Taylor & Francis The Netherlands
Open this publication in new window or tab >>Improved railway punctuality by effective maintenance: a case study
2005 (English)In: Advances in Safety and Reliability: proceedings of the European Safety and Reliability Conference (ESREL 2005), Tri City (Gdynia - Sopot - Gdansk), Poland, 27 - 30 June, 2005 / [ed] Krzysztof Kolowrocki, Leiden: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 2005, p. 1487-1491Conference paper, Published paper (Refereed)
Abstract [en]

A railway has many different requirements, such as safety and punctuality. The purpose of this studywas to explore and describe howmaintenance can contribute to improved punctuality. In an industry branch that is becoming more open, as is the case in Norway where this study was undertaken, it is important to have clear requirements and performance measures. This study has focused on railway stakeholders and their requirements regarding punctuality, the measures employed, and the traceability between requirements, goals, and measurements. Linking the end customer's punctuality requirements to reliability of the track is illustrated. The requirements flow is presented as well as a discussion about its pros and cons. The results of the study can be applied in order to compare different designs of maintenance to fulfil punctuality requirements. The information flow and the measures currently used are not entirely suitable concerning feedback and usefulness for managing availability and thus maintenance

Place, publisher, year, edition, pages
Leiden: Balkema Publishers, A.A. / Taylor & Francis The Netherlands, 2005
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-27570 (URN)84857488900 (Scopus ID)111dd7a0-d614-11db-8550-000ea68e967b (Local ID)978-0415383400 (ISBN)111dd7a0-d614-11db-8550-000ea68e967b (Archive number)111dd7a0-d614-11db-8550-000ea68e967b (OAI)
Conference
European Safety and Reliability Conference : 27/06/2005 - 30/06/2005
Note
Godkänd; 2005; 20070319 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-16Bibliographically approved

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