关键词: 电力动车组, 变刚度转臂节点, 半主动控制, 一次蛇行, 车辆动力学性能

Abstract:  In order to suppress the swaying of carbody caused by abnormal wheel-rail matching relationships in EMU operation, a semi-active rotary arm joint was proposed to replace the passive rotary arm joint. The semi-active rotary arm joint with two-level stiffness characteristics was designed, and a mechanics model of the semi-active rotary arm joint was established. The complex stiffness expression of semi-active rotary arm joint with variable inertia channel was derived. The accuracy of the model was verified by bench test comparisons. Based on the control strategy of semi-active rotary arm joint, the co-simulation model of semi-active rotary arm joint and vehicle dynamics was established, and the influences of semi-active rotary arm joint on vehicle dynamics performance under different wheel-rail matching relationships was analyzed. The results show that the semi-active rotary arm joint may effectively reduce the high-amplitude and low-frequency swaying of the carbody in speed interval corresponding to primary hunting, and obviously reduce the amplitude at main frequency of lateral acceleration of the carbody under the condition of low-conicity wheel-rail matching. Compared with the vehicle equipped with traditional passive rotary arm joint, the vehicle equipped with semi-active rotary arm joint has better curve passing capacity and higher critical speed under the conditions of normal wheel-rail matching.

Key words: electric multiple unit(EMU), rotary arm joint with variable stiffness, semi-active control, primary hunting, vehicle dynamics performance