Modeling and tests for response features of MR damper as a shock isolation device

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (5) : 163-168.

LI Zhao-chun 1, ZHOU Bing-qian1, GU Quan1, WANG Jiong2

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Abstract

Response features of a magnetorheological (MR) damper as a shock isolation device with fast response requirement were modeled and tested. A theoretical model for response features of magnetic flux density was established according to the electromagnetic circuit of the MR damper’s coil. The response time constant of the model was determined with the frequency measurement method. Step responses of the magnetic flux density of the MR damper under different currents were tested. The results showed that currents with different amplitudes have no effect on response of magnetic flux density, the average response time constants are 4.9ms (rising step) and 2.8ms (drop step). Furthermore, a second order response model for shear yield stress was established. The step response of the shear yield stress of the MR damper under impact loading was measured utilizing an impact test rig. It was shown that the response time constant obtained with model fitting is 4.8ms; the proposed second order model for shear yield stress agrees well with test data, so this model can effectively describe response features of the MR damper under impact loading.

Key words

magnetorheological (MR) damper / response features / shock isolation / response model

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LI Zhao-chun 1, ZHOU Bing-qian1, GU Quan1, WANG Jiong2. Modeling and tests for response features of MR damper as a shock isolation device[J]. Journal of Vibration and Shock, 2018, 37(5): 163-168

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