内置阀式磁流变阻尼器结构设计及阻尼性能研究

Structure design and damping performance analysis of magnetorheological damper with inner valve

针对目前磁流变阻尼器结构受限时输出阻尼力过小的不足,设计了一种内置阀式磁流变阻尼器。该新型磁流变阻尼器采用内置式磁流变阀代替了目前常用的阻尼器活塞头结构;内置阀液流通道由圆环轴向流、圆盘径向流及小孔流构成。通过控制内置阀产生的压降来控制阻尼器的输出阻尼力。阐述了内置阀式磁流变阻尼器的工作原理,推导了阻尼器可控阻尼力数学模型。采用有限元法(FEM)对内置阀式磁流变阻尼器电磁场进行建模仿真,并通过ANSYS软件一阶优化方法对其结构尺寸进行多目标优化。仿真结果表明:优化后的内置阀式磁流变阻尼器在输入电流为1.0 A时,输出阻尼力由21.89 kN提高到38.94 kN,提高了77.9%。

In view of the shortage of smaller output damping force of magnetorheological(MR)damper when the structure size was limited,a novel MR damper with inner valve was developed.The MR damper proposed is featured by replacing the typical damper piston with inner MR valve.The fluid flow paths of the inner MR valve consist of the annular fluid flow channels,the radial fluid flow channels and the centric pipe fluid flow channels.The output damping force could be regulated by controlling the pressure drop generated by the inner MR valve.The structure and working principle of the MR damper with inner valve were described.A mathematical model of the damping force was established for the proposed MR damper and the magnetic circuit was modeled and simulated by using the finite element method.The first order method of ANSYS software was used to optimize the initial structure with multiple objectives.The simulation results show that the controllable damping force increases from 21.89 kN to 38.94 kN when the input current is 1.0 A,and the increment is 77.9%.