Identification of a Frequency Response Model of Joint Rotation

[+] Author and Article Information
J. D. Becker, C. D. Mote

Department of Mechanical Engineering, University of California, Berkeley, California 94720

J Biomech Eng 112(1), 1-8 (Feb 01, 1990) (8 pages) doi:10.1115/1.2891121 History: Received February 09, 1989; Revised October 02, 1989; Online March 17, 2008


A second order, linear oscillator transfer function model is fit to the measured transfer function relating the abduction-adduction rotation of the first finger to the applied moment. Nearly constant isometric contractions of the first palmar and dorsal interossei are maintained by the subjects during the measurements. The stiffness and damping components of the identified models increase significantly with increasing isometric contraction when compared to those recorded under relaxed contraction. Muscle fatigue causes the natural frequency, damping ratio and stiffness of the joint rotation to decrease under full isometric contraction, and it causes the natural frequency and stiffness to increase when the muscles are relaxed.

Copyright © 1990 by The American Society of Mechanical Engineers
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