Vibration analysis of a micro-slip frictional system considering variable normal load
Xu Chao1, Li Dong-wu1,Chen Xue-qian2,Wang dong2
1.School of Astronautics, Northwestern Polytechnical University, Xi’an 710072;
2.Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621000
Abstract:Dry friction damper is widely applied to reduce the dynamic response amplitudes of engineering structures. There exist complex contact and friction behaviors under vibration excitation, which are multi-scale, hysteretic nonlinear and tangential-normal direction coupled. In this paper, a new interface contact model, which can consider micro-slip friction and variable normal load simultaneously is developed. The relationship between tangential restoring force and displacement is derived. The calculated hysteresis loops are compared with other published models to validate its effectiveness. Furthermore, the improved contact model is applied to a simple friction oscillator under harmonic excitation. The hysteresis curves and energy dissipation per period and frequency response curves calculated by different models are analyzed. The results show that whether considering normal load variation has an important influence on system dynamic response and the proposed model considering coupling of micro-slip tangential force and variable normal force simultaneously more comprehensively, exactly reproduce contact interface mechanics behaviors.
徐 超1,李东武1,陈学前2,王 东2. 考虑法向载荷变化的微滑摩擦系统振动分析[J]. 振动与冲击, 2017, 36(13): 122-127.
Xu Chao1, Li Dong-wu1,Chen Xue-qian2,Wang dong2. Vibration analysis of a micro-slip frictional system considering variable normal load. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(13): 122-127.
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