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TECHNICAL PAPERS

Non-Linear Characteristics in the Dynamic Responses of Seated Subjects Exposed to Vertical Whole-Body Vibration

[+] Author and Article Information
Yasunao Matsumoto

Department of Civil and Environmental Engineering, Saitama University, 255 Shimo-Ohkubo, Urawa, Saitama, 338-8570, Japane-mail: ymatsu@post.saitama-u.ac.jp

Michael J. Griffin

Institute of Sound and Vibration Research, University of Southampton, Highfield, Southampton, SO17 1BJ, Englande-mail: M.J.Griffin@Soton.ac.jp

J Biomech Eng 124(5), 527-532 (Sep 30, 2002) (6 pages) doi:10.1115/1.1499959 History: Received March 01, 2000; Revised May 01, 2002; Online September 30, 2002
Copyright © 2002 by ASME
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References

Figures

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Medians for normalized apparent masses and phases of the eight subjects in a sitting posture measured at five vibration magnitudes: ⋯, the lowest magnitude, 0.125 ms−2 r.m.s.;    the greatest magnitude, 2.0 ms−2 r.m.s.
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Median transmissibilities from vertical seat vibration to vertical vibration at each measurement location at five magnitudes of vibration: ⋯, the lowest magnitude (0.125 ms−2 r.m.s.);    the greatest magnitude (2.0 ms−2 r.m.s.)
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Median transmissibilities from vertical seat vibration to fore-and-aft vibration at each measurement location at five magnitudes of vibration: ⋯, the lowest magnitude (0.125 ms−2 r.m.s.);    the greatest magnitude (2.0 ms−2 r.m.s.).
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Median transmissibilities from vertical seat vibration to pitch vibration at each measurement location at five magnitudes of vibration: ⋯, the lowest magnitude (0.125 ms−2 r.m.s.);    the greatest magnitude (2.0 ms−2 r.m.s.). (The unit for the transmissibilities is [rads−2 /ms−2 ].)
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Medians (–) and inter-quartile ranges (–) of the frequency of the peak in transmissibilities measured at five vibration magnitudes: (a) and (b), transmissibility to the vertical vibration at L3; (c) and (d), transmissibility to the pitch vibration at the head. (The unit for the peak transmissibility in the pitch axis in (d) is [rads−2 /ms−2 ].)
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Relative motion between vertical vibration at L5 and vertical vibration at each measurement location above L5; median transmissibilities at five magnitudes of vibration: ⋯, the lowest magnitude (0.125 ms−2 r.m.s.);    the greatest magnitude (2.0 ms−2 r.m.s.).

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