汽车磁流变液阻尼器特性分析与实验

Analytical and Experimental Study on Performances of MR Fluid Dampers Employing Plates Channel Model

将磁流变液在环形阻尼通道的流动简化为无限宽平板间的准稳态流动,建立了磁流变液平板准静态流动方程,利用磁流变液的双粘本构模型,以及磁流变液流动的边界条件和相容条件,通过求解微分方程得出了磁流变液流动速度分布理论表达式,在给定活塞速度和环形通道的几何尺寸条件下,对磁流变液阻尼器的阻尼力进行理论预测.按照某微型汽车前悬架的技术要求,设计和制作了汽车磁流变液阻尼器,并对此进行了示功特性台架测试,试验结果表明:所提出的理论分析模型和设计原理是可行的.

Based on the Navier-stokes equations in hydrodynamics, quasi-static flow governing equations for magnetorheological （MR） fluids in plates channel are theoretically set up by analyzing force equilibrium on fluid element and making several rational simplifications. Analytical velocity profiles of MR fluids though the plates channels are obtained via solution of the quasi-static flow equations mentioned above using Biviscous constitutive model, those boundary conditions and compatibilities. The formula used to calculate damping force offered MR fluid damper is formulated and damping performances are predicated in order to determine design parameters. In the light of technical requirements for front suspension for ChangAn mini-bus, MR fluid dampers are designed and fabricated in Chongqing University. Measurements from sinusoidal displacement cycle by ShanChuan Shock Absorber Ltd. reveals that the analysis methodology and design theory are reasonable.