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Power absorbed during whole-body fore-and-aft vibration: effects of sitting posture, backrest, and footrest

Nawayseh, Naser and Griffin, Michael J. (2011) Power absorbed during whole-body fore-and-aft vibration: effects of sitting posture, backrest, and footrest Journal of Sound and Vibration, 331, (1), pp. 252-262. (doi:10.1016/j.jsv.2011.08.015).

Record type: Article


Although the discomfort or injury associated with whole-body vibration cannot be predicted directly from the power absorbed during exposure to vibration, the absorbed power may contribute to understanding of the biodynamics involved in such responses. From measurements of force and acceleration at the seat, the feet, and the backrest, the power absorbed at these three locations was calculated for subjects sitting in four postures (feet hanging, maximum thigh contact, average thigh contact, and minimum thigh contact) both with and without a rigid vertical backrest while exposed to four magnitudes (0.125, 0.25, 0.625, and 1.25 m s?2 rms) of random fore-and-aft vibration. The power absorbed by the body at the supporting seat surface when there was no backrest showed a peak around 1 Hz and another peak between 3 and 4 Hz. Supporting the back with the backrest decreased the power absorbed at the seat at low frequencies but increased the power absorbed at high frequencies. Foot support influenced both the magnitude and the frequency of the peaks in the absorbed power spectra as well as the total absorbed power. The measurements of absorbed power are consistent with backrests being beneficial during exposure to low frequency fore-and-aft vibration but detrimental with high frequency fore-and-aft vibration.

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e-pub ahead of print date: 7 September 2011
Published date: 2 January 2012
Organisations: Human Sciences Group


Local EPrints ID: 201937
ISSN: 0022-460X
PURE UUID: bb1524a5-ad73-4540-8157-aa947c1960c8
ORCID for Michael J. Griffin: ORCID iD

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Date deposited: 01 Nov 2011 14:37
Last modified: 18 Apr 2017 01:22

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Author: Naser Nawayseh

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