Study on dynamic characteristics and vibration isolation performance of magnetorheological fluid mount with controllable multi-inertia channel combination squeeze mode

To tackle the challenges posed by non-adjustable low-frequency dynamic characteristics and insufficient damping and stiffness in heavy-duty special vehicle mounting systems, we propose a novel solution: the controllable multi-inertia channel combined-squeeze-mode MR (Magnetorheological) fluid mount. This mount comprises four controllable inertia channels, one Rate-dip channel, and a squeeze plate configuration. Initially, propose a multi-channel MR fluid damper based on existing experimental conditions. Through experimental validation, we demonstrate that applying a 2 A current across different channels enables effective channel switching. Subsequently, analyze the magnetic field and damping forces for both the controllable inertia channels and the squeeze-mode magnetic circuit structure of the MR fluid mount. Then, a lumped parameter model for the controllable multi-inertia channel combined squeeze mode MR fluid mount will be developed alongside a 1/4-scale model of the MR fluid mount system tailored for heavy-duty special vehicles. These models enable a comprehensive study of the dynamic characteristics and vibration isolation performance of the mount under various configurations of controllable inertia channels and squeeze mode combinations. Research findings indicate that applying higher currents to different inertia channels facilitates adjustable peak values and peak frequencies of dynamic stiffness and loss angle within the 0 to 50 Hz range for the MR fluid mount. Moreover, under the influence of the squeeze mode, the mount exhibits significant stiffness and damping characteristics at low frequencies, effectively addressing the issue of insufficient stiffness damping within the mount system at low frequencies.