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Biodynamic response at the palm of the human hand subjected to a random vibration.

Authors
Dong-RG; McDowell-TW; Welcome-DE
Source
Ind Health 2005 Jan; 43(1):241-255
NIOSHTIC No.
20026014
Abstract
This study investigated the biodynamic response (BR) distributed at the palm of the hand subjected to a random vibration. Twelve male subjects were used in the experiment. Each subject applied three coupling actions (grip-only, push-only, and combined grip and push) on a simulated tool handle at three different levels (50, 75, and 100 N) of palm force. This study found that the hand-arm system resonated mostly in the frequency range of 20 to 50 Hz, depending on the specific test treatment and individual characteristics. The maximum vibration power transmission through the palm occurred at the resonant frequency. Increasing the effective palm force generally increased the BR magnitude and resonant frequency. The apparent stiffness measured at the middle frequencies (80-100 Hz) is correlated to the BR in almost the entire frequency range (20-1,000 Hz). Under the same palm force, the push-only action corresponded to the highest BR values while the grip-only action generally produced the lowest values. Since the resonant frequency range matches the dominant vibration frequency range of many percussive tools, it is anticipated that the palm BR and vibration power transmission may have an association with vibration-induced injuries or disorders in the wrist-arm system among the workers using these tools.
Keywords
Vibration-effects; Vibration; Humans; Musculoskeletal-system-disorders; Musculoskeletal-system; Vibration-exposure; Vibration-disease; Biodynamics
Contact
RG Dong, NIOSH, Engineeringn & Control Technology Branch, 105 Willowdale Rd, Morgantown, WV 26505
CODEN
INHEAO
Publication Date
20050101
Document Type
Journal Article
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
0019-8366
NIOSH Division
HELD
Source Name
Industrial Health
State
WV
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