期刊
VEHICLE SYSTEM DYNAMICS
卷 57, 期 3, 页码 444-469出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00423114.2018.1469775
关键词
Vehicle?track systems; random vibration; crosswinds; track irregularities
资金
- National Natural Science Foundation of China (NSFC) [51735012, 51478482, 51678507, 11790283]
- Program of Introducing Talents of Discipline to Universities [B16041]
A stochastic mathematical model is developed to evaluate the dynamic behaviours and statistical responses of vehicle?track systems when random system excitations including crosswinds and track irregularities are imposed. In this model, the railway vehicle is regarded as a multi-rigid-body system, the track system is modelled by finite element theory. These two systems are spatially coupled by the nonlinear wheel?rail contact forces and unsteady aerodynamic forces. The high efficiency and accuracy of this stochastic model are validated by comparing to the robust Monte-Carlo method. Numerical studies show that crosswinds have a great influence on the dynamic performance of vehicle?track systems, especially on transverse vibrations. When the railway vehicle initially runs into the wind field, it will experience a severe vibration stage, and then stepping into a relatively steady state where the fluctuating winds and track irregularities will play deterministic roles in the deviations of system responses. Moreover, it is found that track irregularities should be properly considered in the safety assessment of the vehicle even in strong crosswinds.
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