二维板式磁流减振器的力学建模与实验分析

Modeling and Experimental Analysis for Two-dimensional Plate-type Magneterorheological Damper

针对工程中二维减振需求,设计了一种二维板式磁流变减振器.基Navier-Stokes方程建立了二维平面内减振器的速度和压力分布模型,以及阻尼力计算模型,从理论角度定性分析了结构物理参数工作间隙δ、中间滑板长度和宽度a对减振器的阻尼力的影响,并在二维振动试验台上进行减振实验,分析励磁电流对二维板式磁流变减振器的减振性能的影响.实验表明:当选用适当的磁流变流体后,库仑阻尼力对磁流变减振器阻尼力的影响较大,随着励磁电流的增大磁流变减振器阻尼力变大,系统在两个方向上的振幅均逐渐减少,最大减幅为2. 595 6倍,证实了二维板式磁流变减振器的结构设计是合理的.

A two-dimensional magnetorheological damper is developed for the two-dimensional damping requirement in the engineering.The velocity and pressure distribution model of the two-dimensional plate-type damper,also the damping force calculation model are established based on the Navier-Stokes equation.The structural physical parameters are analyzed in theory including the working gapδ,the length a and the width a of the middle slide plate.Experiments have been done to test the damping performance of the two-dimensional plate-type magnetorheological damper on the two-dimensional vibration test-bed,and the effect of the excitation current on the damping performance is analyzed.The experimental results show that the influence of Coulomb damping force on the damping force of magnetorheological damper is great when the appropriate magnetorheological fluid is used.The damping force of magnetorheological damper becomes larger with the increase of excitation current,and the system amplitude is gradually reduced,the maximum reduction of 2.595 6 times.It’s confirmed that the design of the two-dimensional plate-type magnetorheological damper is reasonable.