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Frequency weighting derived from power absorption of fingers-hand-arm system under z(h)-axis vibration.

Authors
Dong-RG; Welcome-DE; McDowell-TW; Wu-JZ; Schopper-AW
Source
J Biomech 2006 Oct; 39(12):2311-2324
NIOSHTIC No.
20031017
Abstract
The objectives of this study are to derive the frequency weighting from three vibration power absorption (VPA) methods (finger VPA, palm VPA, and total or hand VPA), and to explore whether these energy methods are better than the currently accepted acceleration method. To calculate the VPA weightings, the mechanical impedance of eight subjects exposed to a broadband random vibration spectrum in the z(h)-axis using 18 combinations of hand couplings and applied forces was measured. The VPA weightings were compared with the frequency weighting specified in ISO 5349-1 [2001. Mechanical Vibration--Measurement and Evaluation of Human Exposure to Hand--Transmitted Vibration--Part 1: General Requirements. International Organization for Standardization, Geneva, Switzerland]. This study found that the hand and palm VPA weightings are very similar to the ISO weighting but the finger VPA weighting for the combined grip and push action is much higher than the ISO weighting at frequencies higher than 25 Hz. Therefore, this study predicted that the total power absorption of the entire hand-arm system is likely to be correlated with psychophysical response or subjective sensation. However, if the ISO weighting method cannot yield good predictions of the vibration-induced disorders in the fingers and hand, the hand and palm energy methods are unlikely to yield significantly better predictions. The finger VPA is a vibration measure between unweighted and ISO weighted accelerations. The palm VPA method may have some value for studying the disorders in the wrist-arm system.
Keywords
Vibration; Vibration-exposure; Vibration-effects; Vibration-control; Arm-injuries; Hand-injuries; Biomechanics
Contact
Engineering and Control Technology Branch, HELD, National Institute for Occupational Safety and Health, CDC, MS L-2027, 1095 Willowdale Road, Morgantown, WV 26505, USA
CODEN
JBMCB5
Publication Date
20061001
Document Type
Journal Article
Email Address
rkd6@cdc.gov
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Issue of Publication
12
ISSN
0021-9290
NIOSH Division
HELD
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
Journal of Biomechanics
State
WV
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