EXPERIMENTAL STUDY AND DYNAMIC MAGNETIC FINITE ELEMENT ANALYSIS OF THE RESPONSE TIME OF MAGNETORHEOLOGICAL FLUID DAMPERS
Guan Xinchun1, Guo Pengfei1, Ou Jinping1,2
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1 School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China;2 School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China
Firstly, the response time of a large-scale magnetorheological fluid damper (MRF damper) under different velocities and currents was tested. Then, the changing dynamic magnetic field inducted by changing electric current was simulated by finite element analysis (FEA). Based on variation of shear yield strength of MR fluid at gap between cylinder and piston, the response time of MRF damper was calculated. The response time between tested and calculated was also compared. Finally, the effects of eddy current and electric current response time on the damper’s response were also investigated. The researches show that, it is effective that using history curve of average effective shear yield strength of MR fluid at gap which calculated by FEA to study response time of MRF damper. The results also show that, electromagnetic response time is the most important factor which influence the response time of MRF dampers, and reducing eddy current is the key method to reduce response time of MRF damper. Moreover, the influence of eddy current is much higher at condition of current decreasing, and with the same skip of current, whether current increase or decrease, the smaller the initial current is, the greater eddy current affect the damper’s magnetic circuit and the longer damping force response time is. Shorten response of electric current, may induce higher eddy current, and not always reduce response time of damping force.
Guan Xinchun;Guo Pengfei;Ou Jinping;.
EXPERIMENTAL STUDY AND DYNAMIC MAGNETIC FINITE ELEMENT ANALYSIS OF THE RESPONSE TIME OF MAGNETORHEOLOGICAL FLUID DAMPERS[J]. Journal of Vibration and Shock, 2009, 28(6): 1-5