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

Nawayseh, Naser and Griffin, Michael J. (2010) Power absorbed during whole-body vertical vibration: effects of sitting posture, backrest, and footrest Journal of Sound and Vibration, 329, (14), pp. 2928-2938. (doi:10.1016/j.jsv.2010.01.025).

Record type: Article


Previous studies have quantified the power absorbed in the seated human body during exposure to vibration but have not investigated the effects of body posture or the power absorbed at the back and the feet. This study investigated the effects of support for the feet and back and the magnitude of vibration on the power absorbed during whole-body vertical vibration. Twelve subjects were exposed to four magnitudes (0.125, 0.25, 0.625, and 1.25 m s?2 rms) of random vertical vibration (0.25–20 Hz) while sitting on a rigid seat in four postures (feet hanging, maximum thigh contact, average thigh contact, and minimum thigh contact) both with and without a rigid vertical backrest. Force and acceleration were measured at the seat, the feet, and the backrest to calculate the power absorbed at these three locations. At all three interfaces (seat, feet, and back) the absorbed power increased in proportion to the square of the magnitude of vibration, with most power absorbed from vibration at the seat. Supporting the back with the backrest decreased the power absorbed at the seat at low frequencies but increased the power absorbed at high frequencies. Supporting the feet with the footrest reduced the total absorbed power at the seat, with greater reductions with higher footrests. It is concluded that contact between the thighs and the seat increases the power absorbed at the seat whereas a backrest can either increase or decrease the power absorbed at the seat.

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Submitted date: 27 July 2009
Accepted/In Press date: 23 January 2010
Published date: 16 February 2010
Organisations: Human Sciences Group


Local EPrints ID: 142033
ISSN: 0022-460X
PURE UUID: 2c12bea3-7bb9-40cf-a340-d48078199b76
ORCID for Michael J. Griffin: ORCID iD

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Date deposited: 30 Mar 2010 13:37
Last modified: 18 Jul 2017 23:12

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Author: Naser Nawayseh

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