温度效应下磁流变阻尼器动力学仿真建模与试验

为了精确预测磁流变阻尼器在温度效应下的动力学性能规律,提出一种参数化的仿真建模方法。采用磁流变液试验实测数据拟合方法,建立粘温特性相关非线性物理参数方程;基于Bingham力学模型及对温度效应的影响分析,运用ANSYS软件编译UDF程序、设置模型参数进行参数化仿真建模,以Fluent模块求解粘滞阻尼力,以Emag模块求解库伦阻尼力。搭建温度效应下磁流变阻尼器力学试验平台,并通过试验对仿真模型进行修正、对比与验证,讨论不同温度对阻尼力、能量耗散的变化规律。结果表明,温度效应主要影响粘滞阻尼力,仿真结果与试验实测值高度吻合;不同温度和电流下阻尼器的能量耗散与温度成反比,与库伦阻尼力成正比。仿真建模方法可预测分析输出阻尼力特征,以对磁流变阻尼器进行结构设计和参数优化。

Dynamic Simulation Modeling and Test of MR Damper under Temperature Effect

The magneto rheological damper (MR damper) is a kind of vibration control device with excellent performance, which is used in construction machinery, vehicle, bridge and other fields widely. The MR damper is a complex system of multi field coupling at work, expressing accurately its mechanical properties with mathematical analytical equations is very difficult. In order to accurately predict the dynamic performance of the MR damper under temperature effect, a parameterized simulation modeling method was proposed. A nonlinear physical parameter equation related to the viscosity temperature characteristics was established by using the measured data fitting method of the magneto rheological fluid test. Based on the Bingham mechanical model and the influence analysis of temperature effect, the ANSYS UDF programs were compiled, the model parameters were set up, and the parametric simulation modeling was carried out. The viscous damping forces were solved by using the Fluent module, and the coulomb damping forces were solved by using Emag module. A mechanical testing platform for MR dampers under temperature effect was built, and the simulation models were modified, compared and verified through experiments, and the variation laws of damping force and energy dissipation at different temperatures were discussed. The results showed that the temperature effect mainly affected the viscous damping force; the simulation results were highly consistent with the measured values. The energy dissipation of dampers at different temperatures and currents was inversely proportional to the temperature and proportional to the coulomb damping force. The simulation modeling method can predict the characteristics of the output damping force, and can be used to carry out the structure design and parameter optimization of the MR damper.