Influence of a flexible wheelset on the dynamic responses of a high-speed railway car due to a wheel flat
| Autor: | Subhash Rakheja, Xingwen Wu, Maoru Chi, A. K. W. Ahmed |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Flexibility (engineering)
Computer science business.industry Mechanical Engineering Modal analysis Stiffness Magnitude (mathematics) High speed train 02 engineering and technology Structural engineering 01 natural sciences Automotive engineering 020303 mechanical engineering & transports 0203 mechanical engineering Normal mode 0103 physical sciences medicine Train medicine.symptom business 010301 acoustics |
| Zdroj: | Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit. 232:1033-1048 |
| ISSN: | 2041-3017 0954-4097 |
| DOI: | 10.1177/0954409717708895 |
| Popis: | Large magnitude impact loads caused by wheel flats may excite various vibration modes of wheelsets employed in high-speed trains and thereby contribute considerably to the dynamic response of vehicles. In this study, the wheelset is modeled as a flexible body using the modal approach, which is integrated to a multibody dynamic model of the high-speed train coupled with a flexible track slab model. The multibody dynamic model is formulated for a typical high-speed train consisting of a car body, two bogie frames, and four wheelsets. The track is modeled considering the rail as a Timoshenko beam discretely supported on a flexible track slab. The effects of the wheelset flexibility on the dynamic response are illustrated through comparisons with those obtained with a rigid wheelset considering different vehicle speeds and sizes of the wheel flat. Subsequently, the effects of wheel flats on the vehicle–track system are evaluated in terms of the wheel–rail impact forces, axle-box vertical acceleration, and dynamic stress developed in the wheelset due to a haversine wheel flat. The results suggest that the wheelset flexibility can lead to significantly higher axle-box vibration and wheelset axle stress compared to a rigid wheelset in the presence of a wheel flat. |
| Databáze: | OpenAIRE |
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