磁流变减振器高频硬化特性建模及优化

发布时间：2018-02-27 18:14

本文关键词： 磁流变减振器(MRD) 高频硬化压力分布 CFD 结构优化　出处：《振动与冲击》2016年10期 　论文类型：期刊论文

【摘要】：为准确反映磁流变减振器(MRD)的高频输出特性,基于考虑液体流动惯性和可压缩性的基本磁流变减振器模型,结合高频情况下的MRD内部流动特征,引入流动局部损失成分并考虑磁流变减振器液室内压力分布规律提出了修正的高频模型。为验证模型的准确性,采用动态分层的动网格方法进行了在活塞高频往复运动下磁流变液室内流动情况的计算流体力学(CFD)仿真并获得阻尼力输出。仿真结果表明,提出的模型能够反映磁流变减振器的高频动态硬化情况并准确地预测高频特性曲线中峰值对应频率和峰值大小。最后基于修正的理论模型在保证低频使用性能的前提下以改善高频动态硬化为目标对MRD结构参数进行了优化设计,改善了其高频硬化特性,为MRD的应用和设计提供了参考。
[Abstract]:In order to accurately reflect the high frequency output characteristics of Mr shock absorber (MRD), based on the basic Mr damper model considering the inertia and compressibility of liquid flow, the internal flow characteristics of MRD under high frequency are combined. In order to verify the accuracy of the model, a modified high frequency model is proposed by introducing the local loss components of the flow and considering the pressure distribution in the fluid chamber of the magnetorheological absorber. The dynamic stratified dynamic grid method is used to simulate the fluid flow in the magnetorheological fluid chamber under the high frequency reciprocating motion of the piston, and the damping force output is obtained. The simulation results show that, The proposed model can reflect the high frequency dynamic hardening of Mr shock absorber and accurately predict the peak corresponding frequency and peak value in the high frequency characteristic curve. Finally, the modified theoretical model is used to ensure the low frequency performance. On the premise of improving high frequency dynamic hardening, the structural parameters of MRD are optimized. The high-frequency hardening property of MRD is improved, and the reference is provided for the application and design of MRD.
【作者单位】：同济大学新能源汽车工程中心;
【基金】：国家自然科学基金资助项目(51375343) 上海市教委科研创新项目(15ZZ015)
【分类号】：TB535.1

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