| Citation: | LI Hai-tao, ZHANG Wen-yue, LIN Guo-bin, HONG Yuan-zhuo, CHEN Chen. Self-excited vibration of maglev vehicle track coupling based on flexible suspension module[J]. Journal of Traffic and Transportation Engineering, 2026, 26(9): 88-106. doi: 10.19818/j.cnki.1671-1637.2026.331
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In response to the high-frequency coupled vibration between the vehicle and track occurring during vehicle suspension, the formation mechanism and suppression methods of coupled self-excited vibration were systematically studied, taking into account the flexible characteristics of the suspension module and track structure. A rigid-flexible coupled multi-degree of freedom system dynamics model characterizing the flexible characteristics of the electromagnet and the F-rail was established based on the Euler-Lagrange method. The influence law of control parameters and structural parameters on the stability of the coupled system was analysed using multimodal eigenvalue method. Furthermore, a self-excited vibration energy analysis method based on periodic energy balance was developed to explore the contribution of each parameter under critical instability conditions. The coupled self-excited vibration mechanism of the suspension module and the F-rail was revealed from the perspective of energy input, dissipation, and transfer. Simulation results show that the self-excited vibration may be caused by either the dominant mode of the electromagnet or that of the F-rail. In terms of structural parameters, the stability of the closed-loop system can be improved by appropriately reducing the electromagnet length, decreasing the support stiffness of the F-rail, and increasing the span of the F-rail. Self-excited vibration dominated by the flexible mode of the electromagnet is highly sensitive to its first-order bending mode parameters and the installation position of the suspension sensor on the electromagnet. By introducing modal damping compensation control or optimizing the sensor arrangement, the coupled vibration in a specific frequency band can be effectively suppressed, which has certain significance in engineering guidance.
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