汽车磁流变半主动悬架频域加权次优控制研究

Research on Frequency-Shaping Sub-Optimal Control for Semi-active Suspension

针对人体振动在不同的频段有不同的生理特征,通过对线性二次型控制策略进行频域设计,研究了可用于实际工程的频域加权次优控制策略,并与线性二次最优控制及频域加权最优控制进行了仿真比较。仿真结果表明,合理选择反馈控制变量,频域加权次优控制可取得与频域加权最优控制相近的控制效果,而优于线性二次最优控制,在人体敏感的频段大大降低车身的垂直振动,提高车辆的平顺性能,改善轮胎的接地性。

Because the physiological characteristic of human vibration varies with frequency, linear quadratic （LQ） strategy was designed in frequency. The frequency-shaping sub-optimal strategy that is feasible to engineering application was studied and numerical simulation compared with LQ controller and frequency-shaping optimal controller was also carried out. The simulation result shows that once feedback control variables are selected felicitously, semi-active suspension with frequency-shaping sub-optimal controller can achieve nearly equal control performance as that with frequency-shaping optimal control and better performance than that with LQ controller, which can restrain vertical vibration of vehicle body in human body sensitivity frequency bands, achieve good ride comfort and improve stability.