关键词: 刚柔耦合仿真, 高阶模态截取, 奇异系数, 高速铁路车辆, 横向振动耦合机制, 横向耦合共振

Abstract: According to the innovative techniques and their limitations of ICE3 bogie original design,the stability robustness of high-speed train system integration should be emphasized more in the present practice of high-speed rails,especially to keep from the side-wind instability problems and their harmful influences.Considering the high-order modal truncation and the negative effects of their residual forces to the rigid-flex coupling simulations of high-speed rolling stock,the novel concept of singularity co-efficient was proposed,by which the lateral vibration coupling mechanism and its mechanical determinants had been proved eventually.By taking the small hunting oscillations as independent excitations,the heavier masses suspended under the floor of aluminum carbody(e.g.the traction convertor)would be caused to be in the lateral coupling resonances,which was agreement with the measuring results come from the long-term line tests.Furthermore,by taking the anti-hunting high-frequency impedances as correlative excitations,the modal vibrating-overdamped characteristics of carbody yaw motion would become very remarkable,and the lateral disturbances produced in the interface of carbody to rear bogie would be getting stronger,e.g.when going through the tunnels,the transient lateral flutters of motor suspension will be caused suddenly.Above investigations indicate that the great faults exists in the original design of ICE3 bogie prototype,i.e.the negative effects of anti-hunting high-frequency impedance become to be more prominent due to the absence of structural damping techniques in low-frequency.

Key words: rigid-flex coupling simulation, high-order modal truncation, singularity coefficient, high-speed rolling stock, lateral vibration coupling mechanism, lateral coupling resonance