Abstract
Abstract. In this paper, a novel structure of a controlled multi-channel semi-active magnetorheological (MR) fluid mount is proposed, including four controlled channels and one rate-dip channel. Firstly, the magnetic circuit analysis, rate-dip channel optimization design, and MR fluid mount damping analysis are given. Secondly, the mathematical model of the controlled multi-channel semi-active MR fluid mount is constructed. We analyze the effect of controlled multi-channel closing on the dynamic characteristics of the mounts and the effect of the presence or absence of the rate-dip channel on the low-frequency isolation of the mount. Finally, the controlled multi-channel semi-active MR fluid mount was applied to the 1/4 vehicle model (a model consisting of an engine, a single engine mount, a single suspension and a vehicle frame), with the transmissibility of the engine relative to the vehicle frame at low frequency and the transmissibility of the engine reciprocating unbalanced force to the vehicle frame magnitude at high frequency as the evaluation index. Numerical simulation shows the following points. (1) The controllable multi-channel semi-active MR fluid mount can achieve adjustable dynamic stiffness and damping with applied 2 A current to different channels. (2) With known external excitation source, applied currents to different controllable channels can achieve the minimum transmissibility and meet the mount wide-frequency vibration isolation requirement, while adding a rate-dip channel can improve the low-frequency vibration isolation performance of the MR fluid mount. (3) Switching and closing different controllable channels in the 1/4 vehicle model can achieve the minimum transmissibility of low-frequency engine vibrations relative to the vehicle frame and high-frequency engine vibrations reciprocating an unbalanced force to the vehicle frame. Therefore, the design of the controllable multi-channel semi-active MR fluid mount can meet the wide-frequency isolation.
Highlights
The engine rotational unbalanced reciprocating inertial force and uneven road surface excitation are the main excitation sources of vehicle vibration (Lee et al, 1994)
Ideal engine mounts should exhibit large stiffness and large damping at low frequency and low stiffness and low damping at high frequency to achieve the vibration isolation requirements for different vehicle operating conditions (Christopherson et al, 2012; Yu et al, 2001a)
The results show that the magnetorheological fluid in the controlled channel region utilizes more magnetic energy
Summary
The engine rotational unbalanced reciprocating inertial force and uneven road surface excitation are the main excitation sources of vehicle vibration (Lee et al, 1994). Wang et al (2014) used an electric motor to simultaneously adjust the length and cross-sectional area of the hydraulic mount inertia channel to achieve wide-frequency vibration isolation. (2) Controllable fluid parameters of the semi-active mount can only be continuously adjustable for a specific frequency damping and cannot achieve engine wide-frequency isolation. In order to solve the conflicting design requirements of engine mounts for stiffness and damping characteristics under different frequency operating conditions, a controllable multi-channel semi-active MR fluid mount with adjustable stiffness and damping is proposed. A 1/4 vehicle model was built to evaluate the lowfrequency vibrations with the relative engine and frame displacement transmissibility and the high-frequency vibrations with the force transmissibility as evaluation indexes to verify the controllable multi-flow channel closing on the vibration isolation performance of the power train system
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