Design and Fabrication of Hybrid Operational Modes Magnetorheological Mount

Magnetorheological (MR) mounts, developed based on the field-dependent damping characteristics of magnetorheological fluids (MRFs), are key vibration isolation components in vehicle powertrain systems and are capable of reducing energy losses induced by structural vibrations. Existing studies have mainly focused on single-mode MR mounts, whose vibration isolation performance is considerably inferior to that of hybrid-mode designs. In this study, a hybrid-mode MR mount integrating both squeeze and flow operational modes is proposed. The proposed design incorporates upper and lower Symmetrical squeeze gaps together with four circumferentially distributed flow channels. The structural configuration of the MR mount is presented in detail, and a static structural finite element analysis is performed to evaluate the maximum principal stresses of the load-bearing components under compressive and tensile loading conditions, which are 368.5 MPa and 230.61 MPa, respectively. The results demonstrate that the designed MR mount exhibits a maximum load-bearing capacity of 7000 N. Subsequently, a comprehensive magnetic circuit design is carried out. The magnetic circuit design indicates that, to ensure effective operation of the MR mount, the number of coil turns must exceed 201 in the squeeze mode and 316 in the flow mode. Finally, the assembly process of the MR mount prototype is described in detail, including the installation sequence of the key structural components, the injection procedure of the MRFs, and the final sealing and fixation steps, thereby demonstrating the feasibility and practical manufacturability of the proposed hybrid-mode MR mount design.