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Analys av olika positioneringssystem för Trafikförvaltningens järnvägsbanor
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
2019 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Analyses of different positioning systems for Stockholm Public Transport railway tracks (English)
Abstract [sv]

Positioneringssystem har en vital roll när det gäller att kontrollera säkra tågrörelser. Det finnsmånga olika typer av positioneringssystem. Det här arbetet behandlar hur axelräknare, communications-based train control (CBTC) och olika typer av spårledningar fungerar. Det innehåller ocksåen analys av växelströmsspårledningar och axelräknare med RAMS-parametrar (Reliability, Availability,Maintenance and Safety) som utgångspunkt för att dra slutsats om vilken typ som passar bästför Trafikförvaltningens spårburna banor. Genom intervjuer med erfarna personer inom järnvägsbranscheni Stockholm erhölls kunskap om för- och nackdelar med olika system. En felträdsanalys(FTA) utfördes för axelräknare och spårledningar för att åskådliggöra potentiellt farliga situationer.Felstatistik för två järnvägsbanor togs fram för att visa felfrekvens för en bana med axelräknare ochen bana med spårledningar. Resultatet är inte entydigt men visar ändå att axelräknare undvikerfelkällor som finns hos spårledningar. Det som tydligast kommit fram var att förvaltningen behöverstandardisera till färre typer av system för de olika banorna. Det skulle underlätta vid förvärvandetav personal med rätt kompetens som ska utföra underhåll. Det skulle också göra det lättare att säkerställatillgången till ersättningsprodukter.

Abstract [en]

Positioning systems have a vital role in securing safe movement of trains. There are many differenttypes of positioning systems. This thesis is about how axle counters, communications-based traincontrol (CBTC) and different kinds of track circuits operate. It also contains an analysis of AC-trackcircuits and axle counters with RAMS-parameters (Reliability, Availability, Maintenance and Safety)as guide points to make a conclusion of what type of system that best suits for Stockholm PublicTransports railway tracks. Through interviews with experienced persons within the railway industryin Stockholm knowledge of pros and cons of different systems was obtained. A fault tree analyses(FTA) was made for axle counters and track circuits to visualize potentially hazardous situations.Failure statistics were produced to show failure frequency for one track with axle counters and onetrack with track circuits. A clear result was not shown but it can be concluded that sources of failurethat are prone to track circuit systems can be avoided using axle counters. What became evident isthat the management need to standardize to a fewer amount of different positioning systems. Itwould make it easier to find available personnel with the required skills for doing maintenance. Thiswould also have a benefit when securing maintenance supplies.

Place, publisher, year, edition, pages
2019. , p. 42
Series
TRITA-CBH-GRU ; 2019:219
Keywords [en]
Positioning system, axle counter, track circuit, communications-based train control, fault tree analyses, failure statistics
Keywords [sv]
Positioneringssystem, axelräknare, spårledning, communications-based train control, felträdsanalys, felstatistik
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-259952OAI: oai:DiVA.org:kth-259952DiVA, id: diva2:1353874
External cooperation
Systra AB
Subject / course
Railway Technology
Educational program
Bachelor of Science in Engineering - Electrical Engineering
Supervisors
Examiners
Available from: 2019-09-26 Created: 2019-09-24 Last updated: 2019-09-26Bibliographically approved

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