Effect of phase on discomfort caused by vertical whole-body vibration and shock--experimental investigation

The Journal of the Acoustical Society of America
Yasunao Matsumoto, Michael J Griffin

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 metho...Continue Reading

References

Feb 1, 1971·Human Factors·R W Shoenberger, C S Harris
Jul 1, 1982·Ergonomics·M J GriffinK C Parsons
Aug 1, 1982·Ergonomics·M J GriffinE M Whitham
Jan 21, 2000·The Journal of the Acoustical Society of America·M Morioka, M J Griffin
Jun 16, 2000·Applied Ergonomics·N J Mansfield, M J Griffin

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Citations

Jan 18, 2018·Ergonomics·Giulia PatelliMichael J Griffin

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