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Running Dynamics for a Maintenance Railway Vehicle
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

BS Verkstäder has developed a new railway maintenance vehicle, MTR2000, which is in the process of authority approval. A part of the approval is the running dynamics of the vehicle which for maintenance vehicles following SS‐EN 14033‐1 can be evaluated using a simulation model of the vehicle, which is verified by comparing simulation results to measurements from a vehicle test. The testing, assessment values and limit values for running dynamics follow EN 14363.

The goal of this work was to create a simulation model of the vehicle in the software Gensys and to verify the model with vehicle tests. Using the verified model, simulations were then performed corresponding to the test conditions defined in the standard for approval of running behaviour. The model was also used to investigate how the vehicle’s running behaviour could be improved. The results of the verification showed that the model gave a good representation of the vehicle up to the frame, while attempts to have similar good representation for the cabin were not successful. There were also other aspects of the verification process which could question the validity of the model.

With the verification only being partly successful all further simulations were done with focus kept on results up to the frame were the verification had given the best results.

The results of these latter simulations showed that the vehicle would most likely pass an authority approval process in its current configuration. Simulations performed to try to improve the vehicle running behaviour showed that a decrease of 50% in damper constant for the vehicle’s hydraulic dampers would lead to decreased acceleration levels and lower wheel‐rail guiding forces.

Abstract [sv]

BS Verkstäder har tagit fram ett nytt arbetsfordon, MTR2000, som är i en pågående process för myndighetsgodkännande. En del av detta godkännande avser fordonets gångdynamik vilken för arbetsfordon, som följer standard SS‐EN 14033‐1, kan utvärderas med en simuleringsmodell av fordonet, som är verifierad med en jämförelse av simuleringsresultat och mätningar från ett fordonstest. De tester, storheter och gränsvärden som sedan används följer standard EN 14363.

Målet med detta arbete var att skapa en simuleringsmodell av fordonet i mjukvaran Gensys och sedan verifiera modellen med fordonstest. Med den verifierade modellen utfördes sedan simuleringar för de testförhållanden som standarden beskriver. Därefter användes modellen även till att undersöka om fordonets gångegenskaper kunde förbättras.

Resultaten av verifieringen visade att modellen gav en god representation av fordonet upp till ramen, medan försök att få en lika bra representation upp till hytten inte var framgångsrika. Det fanns även andra aspekter av verifikationsprocessen som kan ifrågasätta modellens validitet. Då verifikationen endast var delvis framgångsrik, lades fokus på resultat upp till ramen i alla vidare simuleringar, då det var där verifikationen gav bäst resultat.

Resultaten av dessa vidare simuleringar visade att fordonet med stor sannolikhet skulle klara av ett myndighetsgodkännande i sin nuvarande konfiguration.

Simuleringar utförda med syfte att försöka förbättra fordonets gångegenskaper visade att en minskning på 50% av dämparkonstanten för fordonets hydrauliska dämpare skulle leda till minskade accelerationsnivåer samt lägre hjul‐räl krafter.

Place, publisher, year, edition, pages
2014. , 101 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2014:48
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-172213OAI: oai:DiVA.org:kth-172213DiVA: diva2:846153
Examiners
Available from: 2015-08-14 Created: 2015-08-14 Last updated: 2015-08-14Bibliographically approved

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