磁流变阻尼器多物理场耦合的温升特性分析

磁流变阻尼器属于一种能量耗散装置,在使用过程中将振动机械能转化为自身热能,阻尼器力学性能受磁场和温度等因素的影响。建立磁流变阻尼器温度场的数学模型和仿真模型,运用COMSOL仿真计算软件,分析了磁流变阻尼器多物理场耦合下的温升特性,通过改变线圈电流大小、激励振幅和频率,对比研究影响阻尼器温升的原因。仿真结果表明,磁流变阻尼器温升主要来自于磁流变液流动的黏性热,小电流时电磁热对阻尼器温升影响较小,激励信号振幅和频率的变化对阻尼器温升影响较大,一维能量平衡法温度场数学模型仅适用于激励信号时大振幅或大频率工况场合。

Analysis of Temperature Rise Characteristics of MagnetorheologicalDamper with Multi-physics Coupling

Magnetorheological damper was an energy dissipation device that converted vibrational mechanical energy into its own thermal energy during using. The mechanical properties of the damper were affected by factors such as magnetic field and temperature. It established mathematical model and simulation model of the temperature field of the magnetorheological damper, and used COMSOL simulation calculation software,it analyzed the temperature rise characteristics of the multi-physics coupling of the magnetorheological damper. By changing coil current size, excitation amplitude and frequency,it compared the reasons affecting the temperature rise of damper. The simulation results showed that the temperature rise of magnetore damper was mainly viscous heat from magnetoelectric fluid flow.The electromagnetic heat was less impact on the temperature rise of the damper when small current,and the change in excitation signal amplitude and frequency large effected the temperature rise of the damper.One-dimensional energy balance method temperature field mathe- matical model only applied to large excitation amplitude or frequency conditions.