Abstract
Magneto-rheological (MR) fluid mount demonstrates excellent performance of vibration isolation in a wide frequency range and potential application in engineering. In this paper, a new mixed mode MR mount is proposed and an analytical model is established and used to predict the performance of MR mount. Meantime, a six degrees of freedom dynamic model of an in-line four-cylinder engine which has three points mounting system is derived by considering the dynamic behaviors of MR mount and its state space form is established. LQR and fuzzy-logic controllers are designed and synthesized to actively control the imposed vibration. The simulation results show that the proposed LQR or fuzzy-logic controllers can isolate the vibration of vehicle engine in a wide frequency range. The amplitudes can be suppressed well by employing this mount system. Its effectiveness will be verified via experiment in the second part of this work.
Highlights
An engine is one of the most dominant noise and vibration sources in vehicle systems
In order to resolve noise and vibration problems generated by vehicle engine, various types of engine mounts have been proposed
If a certain level of magnetic field is applied through the gap, the MR mount produces an additional damping force due to the yield stress of the MR fluid
Summary
An engine is one of the most dominant noise and vibration sources in vehicle systems. In order to resolve noise and vibration problems generated by vehicle engine, various types of engine mounts have been proposed. The passive rubber engine mounts which has low damping, shows efficient vibration isolation performance in the non-resonant and high frequency excitation. It does not have a favorable performance at the resonant frequency excitation [1, 2]. The efficiency of passive hydraulic engine mount in the non-resonant domain is worse than rubber mount. The controllers are experimentally implemented and control performances such as displacement and velocity are evaluated and presented in frequency domain
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