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Assessing the discomfort of dual-axis whole-body vibration

Assessing the discomfort of dual-axis whole-body vibration
Assessing the discomfort of dual-axis whole-body vibration

This paper reports on an experiment designed to provide information fundamental to the prediction of the discomfort of multi-axis vibration. Seated subjects were exposed to various level and phase combinations of 3·15 Hz vertical (az) and 3·15 Hz lateral (ay) sinusoidal vibration. One part of the experiment determined the levels of two single-axis vibrations (az and ay separately) which produced similar discomfort to a selection of dual-axis vibrations. In another part of the experiment subjects adjusted the level of a 3·15 Hz motion in one of the two axes to produced similar discomfort to each of seven levels of the same frequency in the other axis. It was concluded that for dual-axis motions of the type investigated the discomfort is not greatly influenced by the phase between the two single-axis components producing the motion. Thus, the discomfort caused by the circular motion given by the combinations of the two sinusoidal components differing in phase by 90 degrees is similar to that caused by the translational motion produced by the same components combined with zero phase shift. The results confirm that a meaningful estimate of the relative discomfort produced by dual-axis stimuli can be determined from the levels of a single-axis reference motion appropriately adjusted by subjects. The level of a single-axis motion giving similar discomfort to each of the dual-axis conditions in the experiment was well approximated by the root-mean-square of the two levels of this single-axis motion equivalent to the two separate components of each dual-axis motion.

0022-460X
107-116
Griffin, M. J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Whitham, E. M.
50f3c821-687a-4a7e-8e08-b3f803bd7634
Griffin, M. J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Whitham, E. M.
50f3c821-687a-4a7e-8e08-b3f803bd7634

Griffin, M. J. and Whitham, E. M. (1977) Assessing the discomfort of dual-axis whole-body vibration. Journal of Sound and Vibration, 54 (1), 107-116. (doi:10.1016/0022-460X(77)90409-6).

Record type: Article

Abstract

This paper reports on an experiment designed to provide information fundamental to the prediction of the discomfort of multi-axis vibration. Seated subjects were exposed to various level and phase combinations of 3·15 Hz vertical (az) and 3·15 Hz lateral (ay) sinusoidal vibration. One part of the experiment determined the levels of two single-axis vibrations (az and ay separately) which produced similar discomfort to a selection of dual-axis vibrations. In another part of the experiment subjects adjusted the level of a 3·15 Hz motion in one of the two axes to produced similar discomfort to each of seven levels of the same frequency in the other axis. It was concluded that for dual-axis motions of the type investigated the discomfort is not greatly influenced by the phase between the two single-axis components producing the motion. Thus, the discomfort caused by the circular motion given by the combinations of the two sinusoidal components differing in phase by 90 degrees is similar to that caused by the translational motion produced by the same components combined with zero phase shift. The results confirm that a meaningful estimate of the relative discomfort produced by dual-axis stimuli can be determined from the levels of a single-axis reference motion appropriately adjusted by subjects. The level of a single-axis motion giving similar discomfort to each of the dual-axis conditions in the experiment was well approximated by the root-mean-square of the two levels of this single-axis motion equivalent to the two separate components of each dual-axis motion.

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Published date: 8 September 1977

Identifiers

Local EPrints ID: 429174
URI: http://eprints.soton.ac.uk/id/eprint/429174
ISSN: 0022-460X
PURE UUID: be3f16a4-eaee-4fc7-b283-5d3c0561f387
ORCID for M. J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

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Date deposited: 22 Mar 2019 17:30
Last modified: 23 Mar 2019 01:38

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