主动控制电致伸缩液压悬置隔振特性仿真

Simulation of Vibration Characteristics of Active Controlled Hydraulic Mount with Electrostrictive Actuator

采用电致伸缩材料作为主动控制作动器的智能悬置,利用Matlab软件,并考虑了惯性通道、解耦通道以及电致伸缩作动器的非线性,建立了该悬置的仿真模型。选择滤波后的 x LMS算法作为控制算法,通过仿真计算研究了该悬置的隔振性能。采用查表的办法由控制位移求解控制电压,能有效地避免作动器非线性对系统性能的不良影响。研究结果表明:对系统施加控制后,传递到车身上的振动大大减弱,在6 s内振动力降到未施加主动控制时的3%,20s后降到未施加主动控制时的1%。说明采用主动控制能有效地改善悬置的隔振性能。

A simulation model for an active controlled engine mount with an electrostrictive actuator was built by means of Matlab. In the model the nonlinear characteristics of the inertia channel, the decoupler channel, and the electrostrictive actuator were incorporated. An adaptive controller using the filtered x-LMS algorithm was selected to cancel the force transmitted through the active mount in simulation. The control voltage applied in the actuator was calculated by table-inquiring to avoid the negative effect of actuator nonlinearity on the system performance. The research results show that the force transmitted from the engine to the body with control is reduced greatly in the reference frequency, the force amplitude transmitted the body with control is about 3% of without control in 6 s and about 1% of without control in 20 s. It shows that the active controlled mount reduces significantly the vibration transmitted from the engine to the vehicle body.