基于改进天棚控制策略的主动悬架动力学性能研究

Research on Dynamic Performance of Active Suspension Based on Modified Skyhook Control Strategy

针对采用天棚控制策略的主动悬架无法有效抑制车轮振动,从而影响车辆行驶安全性的问题,提出一种改进天棚控制策略。构建了改进天棚控制策略下的线性二自由度动力学模型,对天棚阻尼系数进行了优化设计,以采用天棚控制策略的主动悬架为比较对象,分别进行了频域和时域内的仿真对比。结果表明,相比天棚控制策略,改进天棚控制策略可有效提高高频区的乘坐舒适性和行驶安全性;在相同行驶工况下,改进天棚控制策略的车身加速度均方根值增大了3.36%,但轮胎动载荷均方根值降低了37.61%,证明了改进天棚控制策略的有效性。

Considering that the active suspension with skyhook control strategycannot suppress the vibration of wheel effectively and then driving safety will be affected, a new modified skyhook control strategy was proposed in this paper. A linear two degree of freedom dynamics model with modified skyhook control strategy was established firstly.Then the optimization design of the skyhook damping coefficient was conducted. Finally, simulation results were compared in frequency domain and time domain with those from the skyhook control strategy.The results show that the modified skyhook control strategy can improve the ride comfort and driving safety in high frequency region more effectively. Meanwhile, under the same driving conditions, the RMS value of vehicle body acceleration increases 3.36%, but the RMS value of tire dynamic load decreases 37.61%, which shows the effectiveness of the modified skyhook control strategy.