基于磁流变液弹减振器的发动机减振控制研究

Study on Vibration Reduction Control of Engines Based on Magnetorheological Fluid-elastomeric Damper

磁流变液弹减振器由磁流变阻尼隔振单元和磁流变弹性体隔振单元两部分组成,阻尼和刚度可调。将磁流变液弹减振器用于车辆发动机悬置,引入PID控制、模糊控制、模糊PID控制以及天棚控制策略,以降低发动机振动向车体的传递。建立发动机减振动力学模型与天棚控制动力学模型,以发动机激振力与路面不平度作为扰动输入,用MATALAB软件进行仿真。仿真表明,相对于被动悬置,添加控制策略的磁流变液弹减振器有着良好的减振效果。

Magnetorheological(MR)fluid-elastomeric damper consists of MR fluid unit and MR elastomer unit with adjustable damping and stiffness.In order to reduce the transmission of engine vibration to vehicle’s body,the MR fluidelastomeric damper is applied to vehicle engine mount with the control strategies of PID control,fuzzy control,fuzzy PID control,and skyhook control introduced.The dynamic models of the vehicle engine and the skyhook control are established.With the engine excitation force and road surface unevenness as the disturbance inputs,the dynamic simulation of the models is implemented in MATLAB.The simulation results indicate that the MR fluid-elastomeric damper combined with the control strategy has a superior performance in vibration control compared with the passive mounts.