Research On Equivalent Linear Damping Coefficient Modeling And Control Systems Of Magnetorheological Damper

As a new smart and efficient damper, magnetorheological damper has boardprospects of development, which has characteristics of simple structure, rapid response,continuously adjustable damping force and low consumed power etc. However, due toits strong nonlinearity and hysteresis features, there are very few simple and accuratemechanical models, thereby constraining magnetorheological damper in practicalengineering applications. In this paper, the modified Bouc_Wen model is simplified byusing regression analysis of curve fitting method, and applied to the semi-activevibration control systems of magnetorheological damper.Based on the experimental data of one magnetorheological damper, the dynamicfeatures of the damper is analyzed. A mechanical model of the modified Bouc_Wenmodel is established by using MATLAB/Simulink. By comparing the simulation resultsand experimental results, the accuracy of the modified Bouc_Wen model formagnetorheological damper. This work provides a theoretical basis for establishing theanalytical model for equivalent linear damping coefficient of magnetorheologicaldamper.Based on the modified Bouc_Wen model simulation data, the relationship betweenequivalent linear damping coefficient of magnetorheological damper and threeindependent working parameters: input voltage, excitation amplitude and excitationfrequency is established by regression analysis of curve fitting method. The analyticalmodel for equivalent linear damping coefficient of magnetorheological damper whichcoupled three independent parameters is proposed. Error analysis shows that the relativeerror of the new model is small.Semi-active OFF-ON vibration control strategy and semi-active Fuzzy vibrationcontrol strategy are designed for the double-layer system which coupled withmagnetorheological damper. The simulation model of coupling system is established byutilizing MATLAB/Simulink tool and the results are compared. Simulation results showthat, compared with passive vibration control strategy, OFF-ON vibration controlstrategy and Fuzzy vibration control strategy can effectively suppress the vibration ofcoupling system, and Fuzzy vibration control strategy is superior to OFF-ON vibrationcontrol strategy.