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The effect of rotational vibration in roll and pitch axeson the discomfort of seated subjects

The effect of rotational vibration in roll and pitch axeson the discomfort of seated subjects
The effect of rotational vibration in roll and pitch axeson the discomfort of seated subjects

An experiment was performed to imestigate the effects of vibration level, frequency and foot position on the discomfort of seat ed persons subjected to sinusoidal vibration in roll and pitch axes. Using the method of category production eight seated subjects adjusted roll and pitch vibrations to levels described as uncomfortable on a given semantic scale. The axes of rotation were located on the same horizontal plane as the ischial tuberosities of the subjects. In each axis subjects assessed the discomfort of six frequencies 1.6, 2.0 4.O 8.0, 16.0, 3 to 5 Hz for each of four different heights of a stationary foot-rest and a condition where no foot-rest was used. For all conditions where a foot-rest was present rotational vibration in roll produced greater discomfort than the. same level of rotational vibratio n in pitch. Sensitivity to rotational acceleration decreased with increasing frequency in both roll and pitch axes for all foot positions. Subjects became less sensitive t o rotational vibration in roll and especially pitch as foot height was raised, This was attributed to the decreased contact between the rotating scat and the thighs at higher foot positions.

0014-0139
615-625
Parsons, Kenneth C.
6246820a-8d7c-48f7-8e87-78e2c757408e
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Parsons, Kenneth C.
6246820a-8d7c-48f7-8e87-78e2c757408e
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8

Parsons, Kenneth C. and Griffin, Michael J. (1978) The effect of rotational vibration in roll and pitch axeson the discomfort of seated subjects. Ergonomics, 21 (8), 615-625. (doi:10.1080/00140137808931763).

Record type: Article

Abstract

An experiment was performed to imestigate the effects of vibration level, frequency and foot position on the discomfort of seat ed persons subjected to sinusoidal vibration in roll and pitch axes. Using the method of category production eight seated subjects adjusted roll and pitch vibrations to levels described as uncomfortable on a given semantic scale. The axes of rotation were located on the same horizontal plane as the ischial tuberosities of the subjects. In each axis subjects assessed the discomfort of six frequencies 1.6, 2.0 4.O 8.0, 16.0, 3 to 5 Hz for each of four different heights of a stationary foot-rest and a condition where no foot-rest was used. For all conditions where a foot-rest was present rotational vibration in roll produced greater discomfort than the. same level of rotational vibratio n in pitch. Sensitivity to rotational acceleration decreased with increasing frequency in both roll and pitch axes for all foot positions. Subjects became less sensitive t o rotational vibration in roll and especially pitch as foot height was raised, This was attributed to the decreased contact between the rotating scat and the thighs at higher foot positions.

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Published date: 1978

Identifiers

Local EPrints ID: 413905
URI: http://eprints.soton.ac.uk/id/eprint/413905
ISSN: 0014-0139
PURE UUID: 24dc6b8d-4137-427d-9179-0885eaf4d495
ORCID for Michael J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

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Date deposited: 08 Sep 2017 16:31
Last modified: 07 Oct 2020 02:48

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