Modeling and tests for response features of MR damper as a shock isolation device
LI Zhao-chun 1, ZHOU Bing-qian1, GU Quan1, WANG Jiong2
1. School of Mechatronic Engineering, Nanjing Forestry University, Nanjing 210037, China；
2. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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.
李赵春1,周冰倩1，顾权1，王炅2. 冲击缓冲用磁流变阻尼器的响应特性模型与实验研究[J]. 振动与冲击, 2018, 37(5): 163-168.
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. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(5): 163-168.
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