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http://dx.doi.org/10.5143/JESK.2007.26.1.029

An Analysis of Transmitted-Vibration Characteristics by Different Wrist Posture during Grinding Tasks  

Hwang, Seong-Hwan (Instrumentation & Control Human Factors Division, KAERI)
Lee, Dong-Choon (Department of Industrial & Management Systems Engineering, Dong-A University)
Publication Information
Journal of the Ergonomics Society of Korea / v.26, no.1, 2007 , pp. 29-37 More about this Journal
Abstract
This study was performed to evaluate the characteristics of transmitted vibration to hand-arm system under different work posture while operating a light-weighted powered hand grinder. For the experiment, 8 different types of wrist posture (natural, unlar-flexion, radual-flexion, flexion, extension, complex posture, and etc.) and 3 types of feed force (20[N], 50[N], 70[N]) were considered. 10 male subjects were employed to polish metal plate with a hand grinder. All of them were normal and healthy with no history and symptom of the work related musculoskeletal disorders in the dominant hand. Vibration acceleration data were recorded with sampling rate, 2048[Hz]. In addition, unweighted overall R.M.S. acceleration at the tool and wrist, and transmissibility between them were used to evaluate factors from the recorded tri-axial vibration acceleration. The results indicate that transmissibility of natural wrist posture was significantly higher than others. In addition, as the feed force becomes larger, the vibration was transmitted in large quantities to hand-arm system through radius.
Keywords
MSDs; HAVS(hand-arm vibration syndrome); Transmitted Vibration; Hand tool; Wrist posture;
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