Effect of phase on discomfort caused by vertical whole-body vibration and shock--Experimental investigation
Effect of phase on discomfort caused by vertical whole-body vibration and shock--Experimental investigation
An experimental study has investigated the effect of "phase" on the subjective responses of human subjects exposed to vertical whole-body vibration and shock. The stimuli were formed from two frequency components: 3 and 9 Hz for continuous vibrations and 3 and 12 Hz for shocks. The two frequency components, each having 1.0 ms–2 peak acceleration, were combined to form various waveforms. The effects of the vibration magnitude on the discomfort caused by the input stimuli were also investigated with both the continuous vibrations and the shocks. Various objective measurements of acceleration and force at the seat surface, the effects of different frequency weightings and second and fourth power evaluations were compared with judgments of the discomfort of the stimuli. It was found that a 6% to 12% increase in magnitude produced a statistically significant increase in discomfort with both the continuous vibrations and the shocks. Judgments of discomfort caused by changes in vibration magnitude were highly correlated with all of the objective measurements used in the study. The effects on discomfort of the phase between components in the continuous vibrations were not statistically significant, as predicted using evaluation methods with a power of 2. However, small changes in discomfort were correlated with the vibration dose value (VDV) of the Wb frequency-weighted acceleration. The effect of phase between frequency components within the shocks was statistically significant, although no objective measurement method used in the study was correlated with the subjective judgments.
biomechanics, vibrations
1280-1288
Matsumoto, Y.
326c6cca-baec-4a2f-996d-6909570397de
Griffin, M.J.
24112494-9774-40cb-91b7-5b4afe3c41b8
2002
Matsumoto, Y.
326c6cca-baec-4a2f-996d-6909570397de
Griffin, M.J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Matsumoto, Y. and Griffin, M.J.
(2002)
Effect of phase on discomfort caused by vertical whole-body vibration and shock--Experimental investigation.
Journal of the Acoustical Society of America, 111 (3), .
(doi:10.1121/1.1446051).
Abstract
An experimental study has investigated the effect of "phase" on the subjective responses of human subjects exposed to vertical whole-body vibration and shock. The stimuli were formed from two frequency components: 3 and 9 Hz for continuous vibrations and 3 and 12 Hz for shocks. The two frequency components, each having 1.0 ms–2 peak acceleration, were combined to form various waveforms. The effects of the vibration magnitude on the discomfort caused by the input stimuli were also investigated with both the continuous vibrations and the shocks. Various objective measurements of acceleration and force at the seat surface, the effects of different frequency weightings and second and fourth power evaluations were compared with judgments of the discomfort of the stimuli. It was found that a 6% to 12% increase in magnitude produced a statistically significant increase in discomfort with both the continuous vibrations and the shocks. Judgments of discomfort caused by changes in vibration magnitude were highly correlated with all of the objective measurements used in the study. The effects on discomfort of the phase between components in the continuous vibrations were not statistically significant, as predicted using evaluation methods with a power of 2. However, small changes in discomfort were correlated with the vibration dose value (VDV) of the Wb frequency-weighted acceleration. The effect of phase between frequency components within the shocks was statistically significant, although no objective measurement method used in the study was correlated with the subjective judgments.
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Published date: 2002
Keywords:
biomechanics, vibrations
Organisations:
Human Sciences Group
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Local EPrints ID: 10606
URI: http://eprints.soton.ac.uk/id/eprint/10606
ISSN: 0001-4966
PURE UUID: 96d56353-b630-4955-94ae-8ad77dc9524d
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Date deposited: 01 Aug 2005
Last modified: 15 Mar 2024 05:00
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Author:
Y. Matsumoto
Author:
M.J. Griffin
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