基于MRE的变刚度变阻尼减振器设计研究

Variable stiffness and damping shock absorber design based on MRE

针对磁流变弹性体材料的变刚度及变阻尼特性,将其成功应用于半主动控制减振器研究中。设计专用磁场发生夹具,制备了具有良好磁流变效应的磁流变弹性体材料,并对其力学性能参数进行测试;根据磁流变弹性体材料在挤压工作模式和剪切工作模式的特性,设计了刚度、阻尼均可变化的减振器,并利用有限元软件对该设计方案进行电磁场仿真分析;试制减振器原理样机,在INSTRON万能拉压试验机上,测试其在不同磁感应强度下的变刚度变阻尼特性。试验结果表明:在模拟半主动控制策略下其动刚度变化最大可达55.4%,阻尼变化可达214.3%,证明了该设计方案的可行性。

Magneto-rheological elastomer(MRE)material has features of variable stiffness and damping,it is successfully applied in studying semi-active control shock absorbers.Here,special fixtures were designed for magnetic field generation,and MRE material with good MR effect was made and its mechanical performance parameters were measured.According to characteristics of MRE material in squeezing work mode and shearing one,a shock absorber with variable stiffness and damping was designed.The finite element software was used to do an electromagnetic field simulation analysis for the design scheme,and the prototype of the shock absorber was made.Its variable stiffness and variable damping performances were measured on an INSTRON universal tensile and compression testing machine.The test results showed that under the semi-active control strategy,the maximum change of the shock absorber’s dynamic stiffness can reach 55.4%and that of its damping can reach 214.3%to verify the feasibility of the design scheme.