基于机理的磁流变减震器滞回特性魔术公式模型

摘要

A mechanism-based parametric model for hysteretic characteristics of the magneto rheological damper is developed which can accurately capture the inherent hysteresis behavior of MR damper and has a unified form.Thus it is convenient for implementing semi-active control in vehicle application.Besides,parameters in the model have clear physical meanings.Based on kinetics and rheology,the damping force of the magneto rheological damper is divided into five parts,namely shear stress, viscous force,friction,elastic force and inertia force.Then the hysteresis model of the magneto rheological damper is estab-lished by identifying the parameters of the five parts and their relations with current excitation.The new model is validated a-gainst the experimental data and it's shown that there is a good agreement between them.%为了发展一种新的、简单通用的磁流变减震器模型,以适用于半主动悬架的动力学分析与控制.通过对磁流变减震器进行运动学和流变学分析,将减震器的作用力分为剪切项、黏性项、摩擦项、弹性项和惯性项.对于其中表征磁流变液特性的剪切项,使用魔术公式进行描述,变化魔术公式中的系数可以适应不同使用工况,达到精度和适应性的统一.以魔术公式描述剪切项是该文的特色,因此将所提出的模型称为魔术公式模型.通过参数辨识获得各项参数与施加电流的关系,建立起磁流变减震器滞回特性魔术公式模型.该模型形式简单、参数一致且参数物理意义明确,方便用于半主动悬架系统动力学分析与控制器开发.通过试验数据与仿真结果对比,证明模型有较好的精度和适用性.