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The Vibration Isolation Performance and Control Method Research of MRF Semi-active Engine Mount

Author: WangXueZuo
Tutor: ShiWenKu
School: Jilin University
Course: Vehicle Engineering
Keywords: Engine mount Magnetorheological liquids Bond Graph Vibration isolation performance Semi-active control
CLC: U463.33
Type: Master's thesis
Year: 2011
Downloads: 115
Quote: 0
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Abstract


In recent years, due to the improvement of road conditions and high-power engine, lightweight body applications, as well as consumers improved ride comfort requirements, vehicle NVH problems caused by engine vibration become more prominent. Therefore, the people of the engine mount component vibration isolation performance requirements continues to increase. Traditional suspension components is difficult to meet the complex ideal vibration isolation characteristics in the broadband segment, the semi-active / active engine mount came into being, the other hand, the vigorous development of smart materials for engine vibration isolation technology provides a broad development prospects. Magnetorheological engine mount of this study is the combination of magnetorheological fluid with isolator technology, belong to the typical semi-active control hydraulic suspension. Magnetorheological suspension is realized by controlling the current to change the applied magnetic field strength in the suspension, thereby changing the flow of the liquid of the magnetorheological suspension dynamic characteristics of the real-time controllable. Magnetorheological effect of magnetorheological liquid shear yield stress and rheological properties described analysis; design an the magnetorheological engine mounting structure, and establish a bond graph model, the mathematical model of the suspension The dynamic characteristics of the parametric study; two control methods were used to control the two degrees of freedom of the engine - chassis vibration system simulation, and simulation data for comparative study. Paper the work is carried out for the development of magnetorheological suspension exploratory research, the main contents are as follows: first discusses the characteristics of the engine mount ideal isolation; Review magnetorheological the course of development of the technology and commercial applications, as well as semi-active Research Progress control strategy. Analysis of magnetorheological effect of magnetorheological fluid, shear yield stress and the rheological properties. Subsequently, it is proposed the magnetorheological fluid applied to the conventional hydraulic suspension vibration isolation performance improvements in thinking, analysis of the the magnetorheological suspension of works with the main mode, the derivation of the the liquid damping mode current work with the current changes in the expression, and an existing hydraulic suspension is based on keeping the rubber main spring and metal support frame constant, design a magnetorheological fluid as the enclosed liquid hydraulic suspension structure. Then, in the the magnetorheological suspension hydraulic model based on the use of bond graph theory to establish its bond graph model derived its equation of state, and the derivation of the magneto-rheological suspension dynamic stiffness and damping lag angle frequency changes characteristic expression suspension of low-frequency dynamic characteristics, application Matlab programming simulation and parametric study analyzed the impact of the current strength of the dynamic characteristics. Finally, consider the suspension stiffness and equivalent damping engine - frame of two degrees of freedom suspension system model, using MATLAB / Simulink simulation modules to build simulation models, namely the use of fuzzy control and fuzzy PID control method of mounting system semi-active control of time-domain simulation obtained under various conditions frame acceleration and passing rate curve, compared with passive suspension system, the results show that appropriate control methods magnetorheological suspension systems across the larger performance improvement, and vibration control effect of Fuzzy PID control method than fuzzy control method is better.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Travel System > Suspension
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