Effects of static compression on the vibration modes of a fingertip.
Wu-JZ; Rakheja-S; Dong-RG; Smutz-WP
Journal of Low Frequency Noise, Vibration, and Active Control 2002 Oct; 21(4):229-243
The vibrotactile perception threshold measurement technique is used to diagnose sensory neuropathy of the hand. The vibration perception threshold of a human finger could be most sensitive in the vicinity of one or more of its resonant frequency. The purpose of the present study is to investigate, theoretically, the effects of deformation (compression) on the free vibration behaviour of fingertips. An in-plane finite element model of the fingertip tissue has been formulated on the basis of the anatomical structure and the nonlinear elastic material properties of the soft tissue. The vibration modes of a fingertip model have been analyzed under different deformation states. Our results show that the modal vibration characteristics of the fingertip are deformation-dependent; the eigenfrequencies of the fingertip increase with the increasing preload. The present study suggests, from a theoretical point of view, that the static deformation state will influence the vibration modes and thus the perception threshold of fingertips.
Vibration-exposure; Vibration-effects; Neuropathy; Neuropathology; Sensitization; Models; Vibration; Neurological-system; Neurological-diseases
National Institute for Occupational Safety and Health, ECTB/HELD/NIOSH/CDC, 1095 Willowdale Road, Morgantown, West Virginia, 26505, USA
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Journal of Low Frequency Noise, Vibration, and Active Control