基于随机最优控制的主动悬架构件的动态疲劳可靠度分析

Analysis of Dynamic Fatigue Reliability of Active Suspension Based on Random Optimal Control

针对两自由度的车辆模型,应用随机振动和随机最优控制的理论,推导悬架构件随机动载荷的统计规律的计算方法,建立变车速情况下随机动载荷的概率模型,提出基于随机最优控制的主动悬架构件的动态疲劳可靠度的分析方法。仿真结果表明,主动悬架构件随机动载荷明显大于被动悬架构件随机动载荷,主动悬架系统构件的动态疲劳可靠度在整个使用过程中都要低于普通被动悬架构件的动态疲劳可靠度,说明主动悬架构件的可靠性较普通被动悬架有所降低。

Using the theory of random vibration and random optimal control,a calculation method of statistical law of random dynamic load on suspension parts for the two-degree vehicle model was deducted.The probability model of random dynamic load under variational velocity of the vehicle was established.An analysis method of the dynamic fatigue reliability of suspension parts based on random optimal control was proposed.The simulation results show that the random dynamic load on the active suspension parts is in evidence bigger than that on the passive suspension parts,and that the dynamic fatigue reliability of the active suspension parts in use is smaller than that of the passive suspension parts.This illuminates that the reliability of the active suspension parts is reduced than that in the passive suspension parts.