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TECHNICAL PAPERS: Joint/Whole Body

Biodynamic Response of Human Fingers in a Power Grip Subjected to a Random Vibration

[+] Author and Article Information
R. G. Dong, D. E. Welcome, T. W. McDowell, J. Z. Wu

Engineering & Control Technology Branch, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, West Virginia 26505, USAe-mail address of lead author: rkd6@cdc.gov

J Biomech Eng 126(4), 447-457 (Sep 27, 2004) (11 pages) doi:10.1115/1.1784479 History: Received December 03, 2003; Revised March 31, 2004; Online September 27, 2004
Copyright © 2004 by ASME
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References

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Figures

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Dynamic forces and acceleration at the interfaces between the fingers and the handle, and between the palm and the handle (Ff: static grip force on the fingers; Fp: static grip force on the palm; F̃f: dynanic force acting on the fingers; and F̃p: dynamic force on the palm; and Ã: handle acceleration)
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A sketch of the instrumented handle used for the measurement of the biodynamic responses at the fingers
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Subject posture and measurement setup
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Vibration power spectral density (PSD) used in the experiment
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Biodynamic response parameters as functions of frequency: (a) apparent mass, AM; (b) mechanical impedance, MI; (c) apparent stiffness, AS; (d) MI phase angle; (e) vibration power absorption, VPA (real part of vibration power transmission); and (f) imaginary part of vibration power transmission, VPT_imaginary
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Effects of coupling action for the three force levels and effects of force level for the three coupling actions on the magnitude of mechanical impedance
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Effects of the hand coupling action on the biodynamic response parameters: (a) apparent mass, AM; (b) mechanical impedance, MI; (c) apparent stiffness, AS; and (d) MI phase angle; (e) vibration power absorption, VPA; and (f) vibration power transmission, VPT_imaginary
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Effects of the finger grip force on the finger biodynamic response parameters: (a) apparent mass, AM; (b) mechanical impedance, MI; (c) apparent stiffness, AS; and (d) MI phase angle; (e) vibration power absorption, VPA; and (f) vibration power transmission, VPT_imaginary
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Effects of the individual difference (subject) on the biodynamic response parameters: (a) apparent mass, AM; (b) mechanical impedance, MI; (c) apparent stiffness, AS; and (d) MI phase angle; (e) vibration power absorption, VPA; and (f) vibration power transmission, VPT_imaginary
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Correlations between the biodynamic response magnitude and a few anthropometrical parameters (height, weight, hand breadth at the metacarpal, hand length, hand circumference at metacarpal, finger volume, and hand volume) at different frequencies

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