基于修正Backlash滞环的磁流变减振器建模

Magnetorheological shock Absorber modeling based on the modified Backlash hysteresis

针对磁流变减振器在半主动控制应用中的非线性建模问题,借鉴电磁学中描述磁滞现象的方法,引入动态Backlash-like模型描述阻尼力—速度特性中的滞回现象,兼顾磁流变减振器在不同电流及不同频率时的动特性,利用Sigmoid函数修正Backlash滞环,并考虑磁流变液屈服后黏性及充气压力作用,并联一个弹簧-阻尼系统,从而提出一种修正Backlash滞环的参数化模型.在试验台架上对自制的磁流变减振器进行不同电流和频率下的动特性试验,用试验数据对模型参数进行辨识,并验证了该模型的预测性能,预测误差小于10%-15%.该模型结构简单,能较精确地描述和预测磁流变减振器动特性,具有良好的实用价值.

Because of the hysteresis nonlinear modeling problems when the magnetorheological damper（MRD） is applied to the semi-active control system, referred to the phenomenon description method of the electromagnetic hysteresis, introduced the dynamic Backlash-like model to re- flect the hysteresis of damping force vs. velocity, took into account the dynamic characteristics of MRD in different currents and frequencies, modified with Sigmoid function, and considered the role of post-yield viscous and inflation pressure, the authors developed a parametric model of modified Backlash hysteresis. Then, after testing the dynamic characteristics of self-made MRD in different currents and frequencies on the bench, identifing the model parameters by use of testing data, and verifing the predictive performance of the model, the authors found prediction error was less than 10%-15%. The results show that the model is simple, capable of describing and predicting the dynamic characteristics of MRD more accurately, and has a good practical value.