Abstract
In hydraulic hybrid vehicles (HHV), vibration in dual-mode pump/motor units should be isolated from the chassis. A mixed mode magnetorheological (MR) fluid mount was adopted to isolate this vibration and was evaluated in a quarter car model. The MR fluid mount was designed to be able to operate in flow mode and squeeze mode independently and simultaneously. For HHVs, it is desirable to control force and displacement transmissibility. These simulation results presented a basis for designing an effective algorithm to control both the displacement transmissibility and force transmissibility. Moreover, a hierarchical controller for minimizing the two requirements for transmissibility was also constructed. At last, a fuzzy logic controller was devised to closely reproduce the effect of the hierarchical controller. The experiments were set up to facilitate the hardware-in-the-loop evaluation of the mount. Results from the experiments showed that the mixed mode MR fluid mount was able to achieve desired dynamic stiffness profile to minimize the dual-transmissibility criterion.
Highlights
Solutions to the noise, vibration and harshness (NVH) issues have always been the interest in many fields especially the automotive industry for improving the ride and handling characteristics
The skyhook control algorithms were designed for flow mode and squeeze mode separately and simultaneously
Simulation results indicate that the skyhook control algorithm can obtain the lowest transmissibility for either flow mode or squeeze mode individually
Summary
Vibration and harshness (NVH) issues have always been the interest in many fields especially the automotive industry for improving the ride and handling characteristics. Various control algorithms for MR fluid-based devices have been researched and proposed so that these semi-active devices can achieve satisfactory performance for vibration isolation. This paper studied the behavior of a mixed mode MR fluid mount used in a two DOF model based on quarter car concept Both displacement transmissibility and force transmissibility are examined for the effect of flow mode and squeeze mode separately and simultaneously and skyhook control on flow mode and squeeze mode separately and simultaneously. Results from the experiments show that the mixed mode MR fluid mount is able to achieve desired dynamic stiffness which is directly related to vibration transmissibility
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