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Analysis of the point mechanical impedance of fingerpad in vibration.

Authors
Wu-JZ; Dong-RG; Welcome-DE
Source
Med Eng Phys 2006 Oct; 28(8):816-826
NIOSHTIC No.
20031036
Abstract
Biodynamic responses of the finger-hand-arm system, such as apparent mass and mechanical impedance, characterize the relationship between the motion of the finger-hand-arm system and the dynamic force acting on the driving point, and they are useful for vibration exposure assessment. In the present study, a two-dimensional finite element (FE) model has been proposed to simulate the biodynamic responses of the fingerpad in vibration tests. The fingernail was supported by the rigid ground while the fingerpad was activated by a vibration probe. The fingertip model is composed of skin, subcutaneous tissue, bone, and nail. The soft tissues (i.e., skin and subcutaneous tissues) were assumed to be non-linearly elastic and linearly viscoelastic. The FE model was applied to predict the effects of pre-indentation of the vibration probe onto the fingerpad, the damping of the soft tissues, and probe mass on the magnitude and phase angle of the mechanical impedance and the apparent mass, as measured in the vibration tests. The model predictions showed that the probe mass has non-negligible effects on the measured biodynamic responses in the vibration tests. In order to determine "true" biodynamic responses of the finger-hand-arm system, the mass effects have to be cancelled using an appropriate approach. The present analysis provided a theoretical explanation, from a biomechanical point-of-view, for the inconsistencies in the published experimental data for the biodynamic responses of fingerpad.
Keywords
Vibration; Vibration-effects; Vibration-exposure; Biodynamics; Exposure-assessment; Models; Biomechanics; Biomechanical-modeling; Musculoskeletal-system
Contact
National Institute for Occupational Safety & Health, 1095 Willowdale Road, MS-2027, Morgantown, WV 26505, USA
CODEN
MEPHEO
Publication Date
20061001
Document Type
Journal Article
Email Address
jwu@cdc.gov
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Issue of Publication
8
ISSN
1350-4533
NIOSH Division
HELD
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
Medical Engineering and Physics
State
WV
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