期刊
VEHICLE SYSTEM DYNAMICS
卷 60, 期 4, 页码 1097-1124出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00423114.2020.1847298
关键词
Vehicle– track interaction; finite-element coupling; multi-time-step method; wheel– rail dynamic interaction
资金
- National Natural Science Foundation of China [52008404, U1934217]
In this paper, modelling methods are developed to explore the dynamics of the vehicle-track system and its substructures. A coupled model is constructed to characterize the vehicle-track interaction, and a multi-finite-element coupling method is presented to integrate multiple substructures. A multi-time-step solution method is proposed to achieve a hybrid solution. Numerical examples demonstrate the accuracy and practicality of the proposed model and methods.
In this paper, modelling methods are developed to achieve dynamics exploration for the vehicle-track system and its substructures. First, a coupled model, with the satisfaction of wheel-rail displacement compatibility and force equilibrium within each time step, is constructed for the characterisation of vehicle-track interaction, where the vehicle is modelled as a multi-rigid-body system, the ballasted tracks are modelled as a combination of elasticity, damping and mass structures by finite-element method, and time-varying wheel-rail contacts in geometry, creep and force are depicted at the three-dimensional space. On the foundation of vehicle-track interactions, a multi-finite-element coupling method originated from the energy variation principle is presented to integrate multiple substructures, such as bridge and soil subgrade, into the vehicle-track coupled system. Due to the variation of dominant frequencies of the vehicle-track system and its substructures, a multi-time-step solution method is proposed to achieve a hybrid solution of fine and coarse time step size for the vehicle-track system and substructure system, respectively. Numerical examples are presented to show the accuracy and practicality of the proposed model and methods.
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