Design methodology for magnetorheological energy absorbers considering wall slip and falling weight impact tests
DU Xinxin1,2, GAN Bin3, JIAN Xiaochun2, FU Benyuan1, LIU Chunzhi2, LIAO Changrong1
1. Key Laboratory for Optoelectronic Technology and Systems of Ministry of Education, Chongqing University, Chongqing 400044, China;
2. College of Traffic & Transportation, Chongqing Jiaotong University, Chongqing 400074, China;
3. Design Institute under Nuclear Power Institute of China, Chengdu 610014, China
Abstract:To improve the accuracy of mechanical models and achieve high precision prediction of dynamic characteristics of magnetorheological energy absorbers under impact, the Herschel-Bulkley constitutive model was modified by considering the apparent slip and wall slip conditions. By analyzing the influence of apparent slip and wall slip conditions on the pressure gradient in the damper channel, the results show that the pressure gradient decreases with the viscosity of carrier fluid decreasing under the influence of apparent slip condition, and the influence is more significant at low velocity. The pressure gradient increases with the viscosity of carrier fluid under the influence of apparent slip condition, while the effects on the overall structure are not important. The pressure gradient of the damper channel is obviously influenced by the wall slip condition, and the pressure gradient changes more significantly with the wall slip coefficient. Comparisons between measured and computed results under different currents and impact velocity reveal that the new model can well predict and characterize the mechanical properties of the magnetorheological energy absorber. The flow of magnetorheological fluid in the damper channel is mainly affected by the wall slip, and is slightly influenced by the apparent slip condition.
杜新新1,2,甘斌3,简晓春2,付本元1,刘纯志2,廖昌荣1. 考虑壁面滑移的磁流变胶泥缓冲器设计理论与落锤冲击试验[J]. 振动与冲击, 2021, 40(8): 201-208.
DU Xinxin1,2, GAN Bin3, JIAN Xiaochun2, FU Benyuan1, LIU Chunzhi2, LIAO Changrong1. Design methodology for magnetorheological energy absorbers considering wall slip and falling weight impact tests. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(8): 201-208.
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