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KMID : 1039220230330020103
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Journal of Korean Society of Occupational and Environmental Hygiene
2023 Volume.33 No. 2 p.103 ~ p.114
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Evaluation of Hand-Arm Vibration Exposure Level and Work Environment Satisfaction of Workers in Automobile Manufacturer Assembly Process
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Park Seong-Hyun
Kang Mo-Yeol
Kim Seung-Won
Choi Sang-Jun
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Abstract
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Objectives: This study was conducted to evaluate hand-arm vibration (HAV) exposure levels due to the use of power hand tools and to evaluate the determinants in the automobile assembly process.
Methods: The exposure level to HAV was evaluated for 30 work lines in five assembly processes (body, engine, chassis, door, and design) that use air-powered tools and battery-powered tools and operate in circulation for two hours. The 2-hr equivalent energy vibration acceleration, A (2), of the task was measured. The 8-hr equivalent energy vibration acceleration, A (8), was estimated in consideration of the number of tasks that can be performed per day by each process. In addition, a survey on the working environment was conducted with workers exposed to vibration.
Results: The geometric mean of the HAV exposure level, A (2), for a total of 30 tasks was 2.51 m/s², and one case was 10.30 m/s², exceeding TLV (2hr). The HAV exposure level of A (8) was evaluated from 1.03 m/s² to 5.36 m/s². A (2) showed a statistically significant difference (P<0.01) for each process, and the chassis process (GM=3.90 m/s²) was the highest. The larger the tool size and the longer the tool length, the higher was the vibration acceleration when using a battery-powered tool than an air-powered tool (P<0.01). Battery-powered tool users showed higher dissatisfaction on all items than did air-powered tool users.
Conclusions: As a result of this study, it is necessary to implement a program to reduce the HAV exposure levels.
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KEYWORD
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air-powered tool, automobile assembly process, battery-powered tool, hand-arm vibration
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