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Frequency weightings for fore-and-aft vibration at the back: effect of contact location, contact area, and body posture

Frequency weightings for fore-and-aft vibration at the back: effect of contact location, contact area, and body posture
Frequency weightings for fore-and-aft vibration at the back: effect of contact location, contact area, and body posture
Fore-and-aft vibration of a backrest can influence discomfort and the risk of injury associated with whole-body vibration. Relevant standards (BS 6841:1987 and ISO2631-1:1997) recommend the Wc frequency weighting for evaluating fore-and-aft vibration of backrests, but do not specify the precise location for measuring vibration. This study determined equivalent comfort contours for fore-and-aft vibration of the backs of seated persons from 2 to 80 Hz using the method of magnitude estimation, examining the effect of input location, contact area, and body posture. The equivalent comfort contours indicate decreased sensitivity to vibration acceleration at frequencies greater than 8 Hz. Equivalent comfort contours with a full backrest were similar to those with contact at only the highest location on the back. The derived frequency weightings are broadly consistent with frequency weighting Wc but suggest somewhat greater sensitivity at frequencies greater than 30 Hz and vary in shape with changes in vibration magnitude. It is concluded that with low and moderate magnitudes of vibration the severity of fore-and-aft vibration of a backrest can be assessed from the frequency-weighted fore-and-aft acceleration measured at the highest point of contact between the backrest and the body if the frequency weighting Wc is employed in the evaluation
0019-8366
538-549
Morioka, Miyuki
8eb26aca-8773-4e45-8737-61c2438d30d9
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Morioka, Miyuki
8eb26aca-8773-4e45-8737-61c2438d30d9
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8

Morioka, Miyuki and Griffin, Michael J. (2010) Frequency weightings for fore-and-aft vibration at the back: effect of contact location, contact area, and body posture. Industrial Health, 48 (5), 538-549. (doi:10.2486/indhealth.MSWBVI-05).

Record type: Article

Abstract

Fore-and-aft vibration of a backrest can influence discomfort and the risk of injury associated with whole-body vibration. Relevant standards (BS 6841:1987 and ISO2631-1:1997) recommend the Wc frequency weighting for evaluating fore-and-aft vibration of backrests, but do not specify the precise location for measuring vibration. This study determined equivalent comfort contours for fore-and-aft vibration of the backs of seated persons from 2 to 80 Hz using the method of magnitude estimation, examining the effect of input location, contact area, and body posture. The equivalent comfort contours indicate decreased sensitivity to vibration acceleration at frequencies greater than 8 Hz. Equivalent comfort contours with a full backrest were similar to those with contact at only the highest location on the back. The derived frequency weightings are broadly consistent with frequency weighting Wc but suggest somewhat greater sensitivity at frequencies greater than 30 Hz and vary in shape with changes in vibration magnitude. It is concluded that with low and moderate magnitudes of vibration the severity of fore-and-aft vibration of a backrest can be assessed from the frequency-weighted fore-and-aft acceleration measured at the highest point of contact between the backrest and the body if the frequency weighting Wc is employed in the evaluation

Text
14681 MM-MJG 2010 Frequency_weightings_for_fore-aft_vibration_of_the_back - effects_of_location,_area,_and_posture - Accepted Manuscript
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Published date: April 2010
Organisations: Human Sciences Group, Inst. Sound & Vibration Research

Identifiers

Local EPrints ID: 152805
URI: https://eprints.soton.ac.uk/id/eprint/152805
ISSN: 0019-8366
PURE UUID: 99004109-00e1-4132-8be3-19d74234528e
ORCID for Michael J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

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Date deposited: 17 May 2010 10:24
Last modified: 20 Jul 2019 01:27

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