【摘要】 随着轨道交通的快速发展，动力集中动车组呈现出高速化和重载化的发展趋势，然而在此过程中也引发了一些车辆振动问题。某160 km/h速度级服役动力集中动车组动力车在特殊路段运行时发生了低频晃车现象，严重影响了乘客的乘坐舒适性。针对此现象，文章采用SIMPACK软件建立了动力车动力学模型。首先，在原参数下还原特殊路段动力车低频晃车现象，然后分析判断晃车原因为悬挂参数与轮轨接触工况不匹配，提出了2种悬挂参数匹配方案并进行了线性和非线性稳定性计算分析。结果表明：动力车在低等效锥度下易发生一次蛇行失稳，导致车体产生低频晃车现象；较小的一系纵向刚度和抗蛇行减振器关节刚度有利于增强一次蛇行稳定性，提高该动力车的横向稳定性。更多还原

【Abstract】 With the rapid development of rail transit, power-concentrated EMUs have demonstrated a high-speed and heavy-duty development trend. But this process has also caused carbody shaking problems. The power car of a 160 km/h EMU experiences low-frequency shaking when running under special conditions, which seriously affects passengers’ riding comfort. To address this matter, the dynamic model of the power car is established through the utilization of SIMPACK software. The low-frequency shaking of the power car under special operation condition is restored under the original parameters, and then the cause of shaking is analyzed and judged as the mismatch between suspension parameters and wheel-rail contact conditions. Two types of suspension parameter matching schemes are proposed, and linear and nonlinear stability calculations and analyses are performed. The results suggest that the primary suspension of the power car is prone to yaw instability at low equivalent conicity, which leads to low-frequency shaking of the carbody. The smaller longitudinal stiffness of the primary suspension and the joint stiffness of the anti-yaw damper are beneficial for enhancing the yaw stability of the primary suspension and improving the lateral stability of the power car.更多还原