그라인딩 작업시 손목자세별 국소진동 전달특성 분석 = An Analysis of Transmitted-Vibration Characteristics by Different Wrist Posture during Grinding Tasks

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

1 and low back, "a critical review of epidemiologic evidence for work-related musculoskeletal disorders of neck" Cincinati 197-,

2 Kong, "Wrist and tendon dynamics as contributory risk factors in work-related musculoskeletal disorders" 16 (16): 83-105, 2006.

3 Armstrong, "Some biomechanical aspects of the carpal tunnel Journal of Biomechanics" 567-570, 1979.

4 Armstrong, "Investigation of cumulative trauma disorders in a poultry processing plant" 103-116, 1982.

5 "International Organization for Standardization Mechanical vibration-Guidelines for the measurement and the assessment of human exposure to hand transmitted vibration. ISO 5349 International Organization for Standardization" 1986.

6 F, "Injuries due to hand tools" applied ergo (applied ergo): 273-278, 1987.

7 Grifin, "Handbook of Human Vibration" Academic Press Inc. 1990.

8 Hall, "External pressure at the hand during object handling and work with tools" 20 : 191-206, 1997

9 "Bureau of Labor Statistics Reports on survey of occupational injuries and" 1996.

10 Armstrong, "An ergonomic guide to carpal tunnel syndrome" 103-16, 1983.