Effect of Rail Vehicle–Track Coupled Dynamics on Fatigue Failure of Coil Spring in a Suspension System

In a rail vehicle, fatigue fracture causes a significant number of failures in the coil spring of the suspension system. In this work, the origin of these failures is examined by studying the rail wheel–track interaction, the modal analysis of the coil springs and the stresses induced during operati...

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Bibliographic Details
Published in:Applied sciences 2021-03, Vol.11 (6), p.2650
Main Authors: Sharma, Sunil Kumar, Sharma, Rakesh Chandmal, Lee, Jaesun
Format: Article
Language:English
Subjects:
coil spring
Crack propagation
Degrees of freedom
Experiments
Failure
fatigue failure
Locomotives
Materials fatigue
Mathematical models
Modal analysis
numerical analysis
railway
Rubber
Springs (elastic)
stress
Suspension systems
Undercarriages
Vibration
Wheelsets
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Summary:In a rail vehicle, fatigue fracture causes a significant number of failures in the coil spring of the suspension system. In this work, the origin of these failures is examined by studying the rail wheel–track interaction, the modal analysis of the coil springs and the stresses induced during operation. The spring is tested experimentally, and a mathematical model is developed to show its force vs. displacement characteristics. A vertical 10-degree-of-freedom (DOF) mathematical model of a full-scale railway vehicle is developed, showing the motions of the car body, bogies and wheelsets, which are then combined with a track. The springs show internal resonances at nearly 50–60 Hz, where significant stresses are induced in them. From the stress result, the weakest position in the innerspring is identified and a few guidelines are proposed for the reduction of vibration and stress in rail vehicles.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11062650