Active and Passive Forces in Hand/Work-Object Coupling
Hand/work-object coupling is required to hold and use tools, to transfer work objects, operate controls and support the body. It can be shown biomechanically that coupling entails both active finger flexion and passive friction forces. A laboratory study was conducted to compare voluntary grip strength with breakaway strength for cylindrical handles with high-and low-friction. Six females were recruited to participate. Breakaway strength was measured as subjects held onto an instrumented horizontal cylinder and the load on the hand was continually increased until it slipped off from the bar. Voluntary grip strength was measured using a Jamar grip dynamometer. Breakaway strengths for the high-and low-friction handle (62.9±8.0 kg and 48.6±2.1 kg respectively) were significantly greater than voluntary grip strength (40.7±4.6kg). The difference between grip and breakaway strength is attributed to friction and eccentric versus isometric exertions predicted by biomechanics. The proposed biomechanical model can be used to evaluate hand force requirements and design tools, controls and handholds.
Justin Young Charles Woolley Tom Armstrong Ashton-Miller
Department of Industrial & Operations Engineering Department of Mechanical Engineering University of Michigan Ann Arbor, MI, USA
国际会议
17th World Congress on Ergonomics(第十七届国际人类工效学大会)
北京
英文
1-5
2009-08-09（万方平台首次上网日期，不代表论文的发表时间）