An automotive suspension strut is proposed that utilizes compressible magnetorheological (CMR) fluid. A CMR strut consists of a double ended rod in a hydraulic cylinder and a bypass comprising tubing and an MR valve. The diameter on each side of the piston rods are set to be different in order to develop spring force by compromising the MR fluid hydrostatically. The MR bypass valve is adopted to develop controllable damping force. A hydro-mechanical model of the CMR strut is derived, and the spring force due to fluid compressibility and the pressure drop in the MR bypass valve are analytically investigated on the basis of the model. Finally, a CMR strut, filled with silicone oil based MR fluid, is fabricated and tested. The spring force and variable damping force of the CMR strut are clearly observed in the measured data, and compares favorably with the analytical model.
In this work, two different mounts fabricated from two different smart materials are proposed for the vibration control of a flexible structure subjected to external disturbances. A semi-active magneto-rheological(MR) mount is firstly devised and its damping force controllability by the current intensity is evaluated. Subsequently, an active piezoceramic mount is devised and its field-dependent inertial force is experimentally evaluated. Each mount is then installed on the flexible structure and the corresponding control model is established. The LQG controller is designed for each mount system and empirically realized. Control responses of each control system such as acceleration and displacement are investigated in the frequency domain.
A hybrid mount featuring elastic rubber and piezoelectric material is proposed and applied to the vibration control of a beam structure subjected to high frequency excitations. A mechanical model of the proposed hybrid mount is derived, and then the frequency-dependent dynamic stiffness of rubber and the voltage-dependent stroke of piezoactuator are verified experimentally. After formulating a mathematical model of the beam structure associated with the hybrid mount and the passive rubber mounts, a robust sliding mode controller is designed to attenuate vibration of the beam structure. The controller is experimentally realized and control responses such as accelerations of the beam structure and force transmission through the hybrid mount and rubber mounts are presented in frequency domain.
This paper presents control characteristics of a semi-active magneto-rheological (MR) fluid damper for a passenger vehicle. A cylindrical MR damper is devised and its governing equation is derived. After verifying that the damping force of the MR damper can be continuously tuned by the intensity of the magnetic field, PID controller is employed to achieve the desired damping force. The proposed MR damper is then applied to a full-car model and performance characteristics of the full-car such as vertical acceleration of the body are evaluated via hardware-in-the-loop-simulation (HILS).
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