A study on vibration reduction performance of the upper extremity of industrial assembly anti-vibration exoskeleton
WU Xiaodi1,2, WANG Haibo1,2, ZHANG Le1,2, CHEN Yupeng1,2, XUE Chaojun1,2
1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province, Chengdu 610031, China
Abstract：Operating power tools is potentially harmful. Continuous or intermittent vibration generated by a power tool is transmitted to a palm and a arm, causing damage to the worker's musculoskeletal system. In order to reduce the risk of assembly workers exposed to vibration, this work proposes an anti-vibration exoskeleton with inclined spring-damped upper extremity. The upper extremity of the exoskeleton was mathematically modeled and the amplitude frequency equation and the force transmissibility Tf were obtained by a harmonic balance method. Taking the force transmissibility and natural frequency as the evaluation indexes of the vibration reduction performance, tests with different spring stiffness k1,k2, damping coefficient c1,c2 and connecting rod length ratio l1/l2 were designed to analyze the influence of various structural parameters on the vibration reduction performance. The result of the tests shows that k1,k2、c1,c2 and l1/l2 all have significant influence on vibration reduction performance, and the influence of k2,c2 is higher than that of k1,c1.When the vibration frequency of the tool is lower than the natural frequency of the upper extremity, increasing k1,k2 can effectively reduce force transmissibility and increase vibration reduction performance, and vice versa. Increasing c1,c2 can effectively reduce force transmissibility and improve vibration reduction performance. When l1/l2=1.0, the force transmissibility is the lowest, with better vibration reduction effect.
吴小笛1,2，王海波1,2，张乐1,2，陈俞鹏1,2，薛朝军1,2. 工业装配抗振外骨骼上肢减振性能研究[J]. 振动与冲击, 2020, 39(20): 242-250.
1. 西南交通大学 机械工程学院,成都610031； WU Xiaodi1,2, WANG Haibo1,2, ZHANG Le1,2, CHEN Yupeng1,2, XUE Chaojun1,2. A study on vibration reduction performance of the upper extremity of industrial assembly anti-vibration exoskeleton. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(20): 242-250.
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