电磁反力式混合型主动悬架的模糊控制方法

Study on Electromagnetic Counter-Force Hybrid Active Suspension with Fuzzy Control Method

研究一种新颖的主动悬架——电磁反力式混合型主动悬架的模糊控制方法。根据该主动悬架的结构特点,建立了2自由度1/4车辆模型,通过动力学分析建立其数学模型并提出模糊控制策略。在MATLAB/Sim-ulink环境下,对采用模糊控制的系统进行仿真。结果表明:采用模糊控制的该主动悬架系统,时域内的车身加速度、悬架动挠度和轮胎动载荷分别较被动悬架系统改善24.57%、8.33%、12.71%;较PID控制时也有明显改善;从车身加速度信号的频谱可以看出:模糊控制的该主动悬架与被动悬架相比,在分析的各频率下均大大降低了方均根值,轮胎共振频率处尤为明显,表明作动器的控制效果明显。

A new-type active suspension system-electromagnetic counter-force hybrid active suspension,is studied and developed.According to the characteristics of the suspension structure,one-quarter vehicle with two degrees of freedom is taken for analysis.Through the dynamic analysis,a mathematical model is established and a strategy of fuzzy control algorithm is proposed for the hybrid active suspension.In the environment of MATLAB/Simulink,the model is simulated.The results demonstrate that compared with the passive suspension,the acceleration of the vehicle＇s body,the dynamic deflection of the suspension and the dynamic loading of the tire are reduced by 24.57%,8.33% and 12.71% in time-domain respectively.The power spectral density of car body＇s acceleration shows that the peak value is remarkably reduced in comparison with the passive suspension,especially at the resonance frequency of the tire,and the active actuator with fuzzy controller can perform well.