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Effects of posture and vibration magnitude on apparent mass and pelvis rotation during exposure to whole-body vertical vibration (in special Issue on the 2nd International Conference on Whole-body Vibration Injuries)

Mansfield, N.J. and Griffin, M.J. (2002) Effects of posture and vibration magnitude on apparent mass and pelvis rotation during exposure to whole-body vertical vibration (in special Issue on the 2nd International Conference on Whole-body Vibration Injuries) Journal of Sound and Vibration, 253, (1), pp. 93-107. (doi:10.1006/jsvi.2001.4251).

Record type: Article

Abstract

The effect of variations in posture and vibration magnitude on apparent mass and seat-to-pelvis pitch transmissibility have been studied with vertical random vibration over the frequency range 1·0–20 Hz. Each of 12 subjects was exposed to 27 combinations of three vibration magnitudes (0·2, 1·0 and 2·0m/s2 r.m.s.) and nine sitting postures ("upright", "anterior lean", "posterior lean", "kyphotic", "back-on", "pelvis support", "inverted SIT-BAR" (increased pressure beneath ischial tuberosities), "bead cushion" (decreased pressure beneath ischial tuberosities) and "belt" (wearing an elasticated belt)).
Peaks in the apparent masses were observed at about 5 and 10 Hz, and in the seat-to-pelvis pitch transmissibilities at about 12 Hz. In all postures, the resonance frequencies in the apparent mass and transmissibility decreased with increased vibration magnitude, indicating a non-linear softening system. There were only small changes in apparent mass or transmissibility with posture, although peaks were lower for the apparent mass in the "kyphotic" posture and were lower for the transmissibility in the "belt" posture. The changes in apparent mass and transmissibility caused by changes in vibration magnitude were greater than the changes caused by variation in posture.

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More information

Published date: 2002
Additional Information: Special Issue edited by Iole Pinto, Massimo Bovenzi (guest editor) and Michael J. Griffin (assistant guest editor)
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 10617
URI: http://eprints.soton.ac.uk/id/eprint/10617
ISSN: 0022-460X
PURE UUID: 0cefa8ad-c8bf-4e4a-920b-1436416abbd6
ORCID for M.J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

Catalogue record

Date deposited: 08 Feb 2006
Last modified: 17 Jul 2017 17:06

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Contributors

Author: N.J. Mansfield
Author: M.J. Griffin ORCID iD

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