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A method for analyzing vibration power absorption density in human fingertip.

Authors
Wu-JZ; Dong-RG; Welcome-DE; Xu-XS
Source
J Sound Vib 2010 Dec; 329(26):5600-5614
NIOSHTIC No.
20037644
Abstract
In the current study, we hypothesize that the vibration power absorption density (VPAD) is a good measure for the vibration exposure intensity of the soft tissues of the fingers. In order to calculate the VPAD at a fingertip, we proposed a hybrid modeling approach, which combines a 2D finite element (FE) model with a lumped parameter model. Whereas the lumped components are used to represent the global biodynamic characteristics of the hand-arm system, the FE component is used to predict the detailed stresses, strains, and VPAD in the fingertip. The lumped parameters are determined by using the vibration transmissibilities measured at the fingertip, while the material parameters of the soft and hard tissues of the FE model are adopted from the published experimental data. The proposed model was applied to predict the distributions of dynamic displacement, velocity, and VPAD in the soft tissues of the fingertip. Furthermore, we have derived the frequency weighting based on the VPAD of the soft tissue. The preliminary analysis indicated that the VPAD-based frequency weighting is substantially different from the ISO weighting in that the ISO frequency weighting emphasizes the effect of the vibration at frequencies lower than 25 Hz whereas the VPAD-based weighting generally emphasizes the resonant responses of the finger. Our analysis indicated that the VPAD-based weighting was fairly consistent with the finger surface vibration transmissibility at frequencies greater than the first resonance, suggesting that the finger surface transmissibility may be used as an alternative frequency weighting for assessing the finger vibration exposure. The proposed method provides a practical and efficient tool to simulate the detailed biodynamic responses of a complex biological system to vibration.
Keywords
Vibration-effects; Vibration; Exposure-levels; Hand-injuries; Vibration-monitors; Humans
Contact
John Z. Wu, National Institute for Occupational Safety and Health (NIOSH), 1095 Willowdale Road, Morgantown, WV 26505, USA
CODEN
JSVIAG
Publication Date
20101201
Document Type
Journal Article
Email Address
jwu@cdc.gov
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Issue of Publication
26
ISSN
0022-460X
NIOSH Division
HELD
Priority Area
Construction
Source Name
Journal of Sound and Vibration
State
WV
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