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Discomfort caused by low-frequency lateral oscillation, roll oscillation and roll-compensated lateral oscillation

Discomfort caused by low-frequency lateral oscillation, roll oscillation and roll-compensated lateral oscillation
Discomfort caused by low-frequency lateral oscillation, roll oscillation and roll-compensated lateral oscillation

Roll compensation during cornering (aligning the feet-to-head axis of the body with the resultant force) reduces lateral acceleration, but how any improvement in comfort depends on the frequency of the acceleration has not previously been investigated. Seated subjects judged the discomfort caused by lateral oscillation, roll oscillation and fully roll-compensated lateral oscillation at each of seven frequencies (0.25-1.0 Hz). Irrespective of whether it was caused by pure lateral acceleration or gravitational acceleration due to pure roll, acceleration in the plane of the seat caused similar discomfort at frequencies less than 0.4 Hz. From 0.4 to 1.0 Hz, with the same lateral acceleration in the plane of the seat, there was greater discomfort from roll oscillation than from lateral acceleration. With fully roll-compensated lateral oscillation, discomfort was less than with either the lateral component or the roll component of the motion from 0.2 to 0.5 Hz, but discomfort increased with increasing frequency and caused similar discomfort to pure roll oscillation at 1.0 Hz. Practitioner summary: Tilting can reduce passenger exposure to vehicle lateral acceleration when cornering, but how comfort depends on the frequency of motion was unknown. This study shows 'tilt-compensation' only improves comfort at frequencies less than 0.5 Hz. The findings affect tilting vehicles and the prediction of discomfort caused by low-frequency motions.

low-frequency motion, passenger comfort, tilt-compensation, tilting trains
0014-0139
103-114
Beard, George F.
7319e731-3fa5-4172-bbed-335df92d7e87
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Beard, George F.
7319e731-3fa5-4172-bbed-335df92d7e87
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8

Beard, George F. and Griffin, Michael J. (2013) Discomfort caused by low-frequency lateral oscillation, roll oscillation and roll-compensated lateral oscillation. Ergonomics, 56 (1), 103-114. (doi:10.1080/00140139.2012.729613).

Record type: Article

Abstract

Roll compensation during cornering (aligning the feet-to-head axis of the body with the resultant force) reduces lateral acceleration, but how any improvement in comfort depends on the frequency of the acceleration has not previously been investigated. Seated subjects judged the discomfort caused by lateral oscillation, roll oscillation and fully roll-compensated lateral oscillation at each of seven frequencies (0.25-1.0 Hz). Irrespective of whether it was caused by pure lateral acceleration or gravitational acceleration due to pure roll, acceleration in the plane of the seat caused similar discomfort at frequencies less than 0.4 Hz. From 0.4 to 1.0 Hz, with the same lateral acceleration in the plane of the seat, there was greater discomfort from roll oscillation than from lateral acceleration. With fully roll-compensated lateral oscillation, discomfort was less than with either the lateral component or the roll component of the motion from 0.2 to 0.5 Hz, but discomfort increased with increasing frequency and caused similar discomfort to pure roll oscillation at 1.0 Hz. Practitioner summary: Tilting can reduce passenger exposure to vehicle lateral acceleration when cornering, but how comfort depends on the frequency of motion was unknown. This study shows 'tilt-compensation' only improves comfort at frequencies less than 0.5 Hz. The findings affect tilting vehicles and the prediction of discomfort caused by low-frequency motions.

Text
14722 GFB-MJG 2013 Lateral, roll, and roll-compensated motion - Accepted Manuscript
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More information

Accepted/In Press date: 7 September 2012
e-pub ahead of print date: 12 November 2012
Published date: January 2013
Keywords: low-frequency motion, passenger comfort, tilt-compensation, tilting trains
Organisations: University of Southampton

Identifiers

Local EPrints ID: 406269
URI: http://eprints.soton.ac.uk/id/eprint/406269
ISSN: 0014-0139
PURE UUID: 626c0ca2-194c-43de-9fb8-c444e825a76e
ORCID for Michael J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

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Date deposited: 10 Mar 2017 10:43
Last modified: 07 Oct 2020 02:50

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Author: George F. Beard

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