Abdalaziz Moustafa, Sedaghati Ramin, Vatandoost Hossein
Department of Mechanical, Industrial and Aerospace Engineering, Concordia University, Montreal, QC, Canada.
J Intell Mater Syst Struct. 2023 Aug;34(14):1646-1663. doi: 10.1177/1045389X221151075. Epub 2023 Jan 21.
This paper presents an optimal design of a large-capacity Magnetorheological (MR) damper suitable for off-road vehicle applications. The damper includes an MR fluid bypass valve with both annular and radial gaps to generate a large damping force and dynamic range. An analytical model of the proposed damper is formulated based on the Bingham plastic model of MR fluids. To establish a relationship between the applied current and magnetic flux density in the MR fluid active regions, an analytical magnetic circuit is formulated and further compared with a magnetic finite element model. The MR valve geometrical parameters are subsequently optimized to maximize the damper dynamic range under specific volume and magnetic field constraints. The optimized MR valve can theoretically generate off-state and on-state damping forces of 1.1 and 7.41 kN, respectively at 12.5 mm/s damper piston velocity. The proposed damper has been also designed to allow a large piston stroke of 180 mm. The proof-of-concept of the optimally designed MR damper was subsequently fabricated and experimentally characterized to investigate its performance and validate the models. The results show that the proposed MR damper is able to provide large damping forces with a high dynamic range under different excitation conditions.
本文提出了一种适用于越野车辆应用的大容量磁流变（MR）阻尼器的优化设计。该阻尼器包括一个带有环形和径向间隙的磁流变液旁通阀，以产生较大的阻尼力和动态范围。基于磁流变液的宾汉塑性模型建立了所提出阻尼器的分析模型。为了建立施加电流与磁流变液有效区域中的磁通密度之间的关系，制定了一个分析磁路，并进一步与磁有限元模型进行比较。随后，在特定体积和磁场约束下，对磁流变阀的几何参数进行了优化，以最大化阻尼器的动态范围。优化后的磁流变阀理论上在阻尼器活塞速度为12.5mm/s时，可分别产生1.1kN和7.41kN的关态和开态阻尼力。所提出的阻尼器还设计为允许180mm的大活塞行程。随后制造了优化设计的磁流变阻尼器的概念验证模型，并进行了实验表征，以研究其性能并验证模型。结果表明，所提出的磁流变阻尼器能够在不同的激励条件下提供具有高动态范围的大阻尼力。
