基于混合滑模控制的电液主动悬架抖振研究

Research on buffeting of electrohydraulic active suspension based on hybrid sliding mode control

车辆在行驶过程中,容易受到路面激励波形的干扰,导致车辆抖振幅度较大,从而使乘客乘坐车辆的舒适度下降。对此,本文采用电液主动悬架系统,设计了混合滑模控制方法,并对控制效果进行仿真。建立电液主动悬架系统简图模型,推导出悬架系统动力学方程式,引用滑模控制方法和模糊规则,建立了电液主动专家系统混合滑模控制方案。设置仿真参数和路面激励波形,采用Matlab软件对车辆抖振幅度进行仿真,并与滑模控制方法进行对比和分析。随着车辆行驶速度的增大,车辆受到路面激励波形干扰后,其抖振幅度也会相应增大。但是,电液主动悬架系统采用混合滑模控制方法,其抖振幅度明显降低。采用混合滑模控制方法,能够加快系统的反应速度,抑制车辆抖动幅度,减少传递给乘客的力,从而改善乘客乘坐的舒适性。

When a vehicle is traveling,it is susceptible to interference from the excitation waveform of the road surface,which leads to a large amplitude of vehicle shake,which reduces the comfort of passengers in the vehicle.In this regard,this paper adopts an electro-hydraulic active suspension system,designs a hybrid sliding mode control method,and simulates the control effect.A simplified schematic model of the electro-hydraulic active suspension system is established,the suspension system dynamic equation is derived,and the sliding mode control method and fuzzy rules are used to establish a hybrid sliding mode control scheme for the electro-hydraulic active expert system.Set the simulation parameters and road excitation waveform,use Matlab software to simulate the amplitude of vehicle shake,and compare and analyze it with the sliding mode control method.As the driving speed of the vehicle increases,after the vehicle is disturbed by the road surface excitation waveform,its vibration amplitude will increase accordingly.However,the electro-hydraulic active suspension system adopts a hybrid sliding mode control method,and its vibration amplitude is significantly reduced.The use of a hybrid sliding mode control method can speed up the response speed of the system,suppress the amplitude of vehicle jitter,and reduce the force transmitted to passengers,thereby improving the comfort of passengers.