考虑双时滞特性的半主动悬架系统道路友好性仿真研究

Simulation on Road-friendliness of Heavy Lorries with Semi-active Suspension Systems Considering Dual Time-delay Characteristics

针对半主动悬架系统普遍存在的时滞特性,利用Matlab/Simulink建立可分析双时滞特性对基于混合控制策略的半主动悬架系统的道路友好性影响的仿真模型,分析各时滞参数匹配关系对半主动悬架系统的车辆-路面动态载荷的影响,并利用动态载荷系数、动态载荷应力因子道路友好性指标评价了具有时滞特性对基于混合控制策略的半主动悬架系统的道路友好性影响。研究结果表明在不考虑传感器时滞时,阻尼器的时滞参数设定为0.005～0.007s时可使半主动悬架系统具有较好的道路友好性;得到了最优道路友好性带形区域,即当同时考虑传感器和阻尼器时间滞后参数匹配关系时,两时间滞后设定在由L1和L2构成的最优道路友好性带形区域内时,可有效提高半主动悬架系统的道路友好性。

A simulation model of road-friendliness of heavy lorries with semi-active suspension systems based on hybrid control strategy considering time delay was designed using MATLAB/Simulink package, and the influence of matching relation of two typical time delay on dynamic vehicle-road force was analyzed. And then, road-friendliness of semi-active suspension systems with time delay under hybrid control strategy was evaluated using two typical road-friendliness criterion. Without considering sensor time delays, it is appropriate to set the time delay of adjustable dampers at 0.005-0.006s in order to improve road-friendliness, on the other hand, if sensor time delay and damper time delay are all considered, the time delay values should be set in the strip-region, which is called optimal road-friendliness region.