铁道车辆弹性车体垂向运行平稳性最优控制

Vertical Ride Quality of Flexible Car Body Railway Vehicles with Optimal Control

摘要:

采用基于轨道不平顺谱的最优控制及包括轮轴间时延的预瞄控制算法,设计了整车的主动悬挂控制规律,对铁道车辆弹性车体垂向动力学模型进行仿真分析.结果表明,基于轨道谱的预瞄控制算法在控制输出力及抑制车体的振动效果方面要略优于单纯基于轨道谱的最优控制算法;基于轨道谱的最优控制可以改善轨道至弹性车体中部的加速度传递率,在控制车体刚体振动的同时,也能抑制车体的整体弹性振动;最优控制算法对车体系统的低频振动及车体弹性一阶垂向弯曲振动控制作用明显,而对车体高频振动基本无抑制作用,据此可以帮助选择助动器的响应频率范围.

Abstract:

A vertical dynamic model of railway passenger vehicle is built,which covers effects of car body flexibility and all vertical rigid modes.The model is simulated and researched by the control laws of railway vehicle secondary active suspension which are designed according to optimal control theory,based on track irregularity spectrum and time delay between axles.The results show that optimal control of preview based on track spectrum and time delay between axles is more effective than optimal control only based on track spectrum in the aspects of actuator output force and effects of car body vibration control; the acceleration transmissibility from track to flexible car body center can be reduced by optimal control,rigid and flexible vibration also can be controlled; low frequency vibration and the first order bending vibration of car body can be controlled effectively by optimal control simultaneously,but almost no effects on high frequency vibration,the response frequency range of actuator can be selected accordingly.