高速车辆结构振动的独立模态空间控制

铁路高速客车或轻型车辆的车体结构振动不仅影响车辆运行品质,而且导致车体结构动应力的增加和疲劳寿命的降低.本文在建立高速车辆的柔刚体系统动力学模型基础上,应用最优控制理论,提出了抑制车体的特定低阶垂直弯曲振动独立模态空间控制方法和已改善车辆运行平稳性为目标的控制策略,分析结果表明:该控制办法和策略可以较好地降低特定模态振动的幅度,改善车辆垂直运行平稳性.

Independent modal space control of high speed railway vehicle structure vibration

The elastic vibration of carbody of high speed or light-weight vehicle not only affects the running quality, but also increaseses the structure stress and reduces the fatigue life of carbody. Based on the flex-rigid multibody system dynamics model of railway vehicle, the independent modal space control(IMSC) algorithm for low frequency vertical bending modal structure vibration control of flexible carbody is examined in this paper. A linear quadratic regulator(LQR) strategy based on the IMSC is proposed to control the special vertical bending structure modal of carbody and to improve the ride comfort of railway vehicle. Simulation results also show that the amplitude of special bending modal vibration of carbody can be lowered and the ride comfort can be improved using this control strategy.