Magnetorheological damper is a typical semi-active control device. Its output damping force varies with the internal magnetic field, which is a key factor affecting the dynamic performance of the magnetorheological dampers. Existing studies about the magnetic field of magnetorheological dampers are limited to theoretical analysis; thus, this study aims to experimentally explore the complicated magnetic field distribution inside the magnetorheological dampers with multiple coils. First, the magnetic circuit of a three-coil magnetorheological damper was theoretically analyzed and designed, and the finite element model of the three-coil magnetorheological damper was set up to calculate the magnetic induction intensities of the damping gaps in different currents and numbers of coil turns. A three-coil magnetorheological damper embedded with a Hall sensor was then manufactured based on the theoretical and finite element analysis, and internal magnetic field tests under different conditions were carried out to obtain the actual magnetic induction intensities. At last, the magnetic field coupling model of the three-coil magnetorheological damper was proposed by introducing a coupling coefficient to describe the complex magnetic field distribution due to the strong coupling effect of the three coils, and the results calculated by the proposed model agreed well with the finite element analysis and magnetic field test data. The proposed model lays a foundation for the optimal design of the magnetic circuit and the mathematical model of multi-coil magnetorheological dampers.

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三线圈磁流变阻尼器内磁场测试及磁场耦合模型

磁流变阻尼器是一种典型的半主动控制装置。其输出阻尼力随内部磁场的变化而变化，是影响磁流变阻尼器动态性能的关键因素。现有关于磁流变阻尼器磁场的研究仅限于理论分析；因此，本研究旨在通过实验探索具有多个线圈的磁流变阻尼器内部复杂的磁场分布。首先，对三线圈磁流变阻尼器的磁路进行了理论分析和设计，建立了三线圈磁流变阻尼器的有限元模型，计算了不同电流和线圈数量下阻尼间隙的磁感应强度。转。然后基于理论和有限元分析制造了一个嵌入霍尔传感器的三线圈磁流变阻尼器，并在不同条件下进行了内部磁场测试，以获得实际的磁感应强度。最后提出了三线圈磁流变阻尼器的磁场耦合模型，通过引入耦合系数来描述由于三线圈强耦合作用产生的复杂磁场分布，模型计算结果吻合较好。与有限元分析和磁场测试数据。该模型为磁路的优化设计和多线圈磁流变阻尼器的数学模型奠定了基础。