Transmission of roll and pitch seat vibration to the head
Transmission of roll and pitch seat vibration to the head
A series of experiments has investigated the transmission of roll and pitch seat vibration to the heads of seated subjects. Head motion was measured in all six axes using a light-weight bite-bar while seated subjects were exposed to random motion at frequencies of up to 5 Hz at 1.0 rad.s −2 r.m.s. Subjects sat on a rigid flat seat in two body postures: ‘back-on’ (back in contact with backrest) and ‘back-off’ (no backrest contact). The influence of the position of the centre of rotation was also investigated. Motion at the head occurred mostly in the lateral, roll and yaw axes during exposure to roll seat vibration and in the fore-and-aft, vertical and pitch axes during exposure to pitch seat vibration. A reduction in the magnitude of head motion occurred when the subjects sat in a 'back-off' posture compared with a 'back-on' posture. Varying the position of the centre of rotation along the lateral axis during roll seat vibration affected vertical and pitch head motion: least head motion occurred when the centre of rotation was in line with the subject's mid-sagittal plane. Varying the position of the centre of rotation along the vertical axis during roll seat vibration affected head motion in the mid-coronal plane: roll head motion decreased as the position of the centre of rotation was raised from below the seat surface to above the seat surface. Varying the centre of rotation (along the fore-and-aft and vertical axes) during pitch seat vibration altered head motion in the mid-sagittal plane. Head motion increased with increasing distance of the centre of rotation in front or behind the subject's ischial tuberosities and increased as the seat was raised from below the centre of rotation to above the centre of rotation.
Biodynamics, Head motion, Roll and pitch, Transmissibility, Whole-body vibration
1513-1531
Paddan, G. S.
d019df32-1de8-4ecf-976e-61791661ef13
Griffin, M. J.
24112494-9774-40cb-91b7-5b4afe3c41b8
1 January 1994
Paddan, G. S.
d019df32-1de8-4ecf-976e-61791661ef13
Griffin, M. J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Paddan, G. S. and Griffin, M. J.
(1994)
Transmission of roll and pitch seat vibration to the head.
Ergonomics, 37 (9), .
(doi:10.1080/00140139408964931).
Abstract
A series of experiments has investigated the transmission of roll and pitch seat vibration to the heads of seated subjects. Head motion was measured in all six axes using a light-weight bite-bar while seated subjects were exposed to random motion at frequencies of up to 5 Hz at 1.0 rad.s −2 r.m.s. Subjects sat on a rigid flat seat in two body postures: ‘back-on’ (back in contact with backrest) and ‘back-off’ (no backrest contact). The influence of the position of the centre of rotation was also investigated. Motion at the head occurred mostly in the lateral, roll and yaw axes during exposure to roll seat vibration and in the fore-and-aft, vertical and pitch axes during exposure to pitch seat vibration. A reduction in the magnitude of head motion occurred when the subjects sat in a 'back-off' posture compared with a 'back-on' posture. Varying the position of the centre of rotation along the lateral axis during roll seat vibration affected vertical and pitch head motion: least head motion occurred when the centre of rotation was in line with the subject's mid-sagittal plane. Varying the position of the centre of rotation along the vertical axis during roll seat vibration affected head motion in the mid-coronal plane: roll head motion decreased as the position of the centre of rotation was raised from below the seat surface to above the seat surface. Varying the centre of rotation (along the fore-and-aft and vertical axes) during pitch seat vibration altered head motion in the mid-sagittal plane. Head motion increased with increasing distance of the centre of rotation in front or behind the subject's ischial tuberosities and increased as the seat was raised from below the centre of rotation to above the centre of rotation.
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Published date: 1 January 1994
Keywords:
Biodynamics, Head motion, Roll and pitch, Transmissibility, Whole-body vibration
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Local EPrints ID: 429171
URI: http://eprints.soton.ac.uk/id/eprint/429171
ISSN: 0014-0139
PURE UUID: c677e546-b350-42e1-a01d-593ab43602a8
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Date deposited: 22 Mar 2019 17:30
Last modified: 16 Mar 2024 00:54
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Author:
G. S. Paddan
Author:
M. J. Griffin
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