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Effect of backrest on the discomfort caused by pitch oscillation in the frequency range 0.5 to 5 Hz

Effect of backrest on the discomfort caused by pitch oscillation in the frequency range 0.5 to 5 Hz
Effect of backrest on the discomfort caused by pitch oscillation in the frequency range 0.5 to 5 Hz
There are standardised methods of predicting the vibration discomfort of a seated person caused by translational and rotational vibration at the seat pan, the backrest, and the support for the feet. However, the predictions are based on various assumptions that have not been fully investigated. This study was designed to determine how the discomfort caused by pitch oscillation depends on seating conditions (with and without a backrest). For a rigid seat with and without a rigid flat backrest, 15 subjects judged the discomfort caused by pitch oscillation over the frequency range 0.5 to 5 Hz at magnitudes in the range 0.05 to 5.0 rad.s-2 r.m.s. The rate of growth of discomfort varied between frequencies and depended on whether the backrest was present, so the relative discomfort between frequencies and the effect of the backrest on discomfort depended on the magnitude of vibration. Although the appropriate frequency weighting depends on the magnitude of vibration, at frequencies less than about 1 Hz, the discomfort caused by pitch oscillation is similar with and without a backrest, whereas at frequencies greater than about 1 Hz a backrest will tend to increase the discomfort caused by pitch oscillation.
Arnold, James
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Morioka, Miyuki
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Griffin, Michael
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Arnold, James
c48dc46f-5243-4ca2-a7e2-6b8b1c3b861a
Morioka, Miyuki
8eb26aca-8773-4e45-8737-61c2438d30d9
Griffin, Michael
24112494-9774-40cb-91b7-5b4afe3c41b8

Arnold, James, Morioka, Miyuki and Griffin, Michael (2015) Effect of backrest on the discomfort caused by pitch oscillation in the frequency range 0.5 to 5 Hz. 50th United Kingdom Conference on Human Responses to Vibration, Southampton, United Kingdom. 09 - 10 Sep 2015. 12 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

There are standardised methods of predicting the vibration discomfort of a seated person caused by translational and rotational vibration at the seat pan, the backrest, and the support for the feet. However, the predictions are based on various assumptions that have not been fully investigated. This study was designed to determine how the discomfort caused by pitch oscillation depends on seating conditions (with and without a backrest). For a rigid seat with and without a rigid flat backrest, 15 subjects judged the discomfort caused by pitch oscillation over the frequency range 0.5 to 5 Hz at magnitudes in the range 0.05 to 5.0 rad.s-2 r.m.s. The rate of growth of discomfort varied between frequencies and depended on whether the backrest was present, so the relative discomfort between frequencies and the effect of the backrest on discomfort depended on the magnitude of vibration. Although the appropriate frequency weighting depends on the magnitude of vibration, at frequencies less than about 1 Hz, the discomfort caused by pitch oscillation is similar with and without a backrest, whereas at frequencies greater than about 1 Hz a backrest will tend to increase the discomfort caused by pitch oscillation.

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More information

Published date: September 2015
Venue - Dates: 50th United Kingdom Conference on Human Responses to Vibration, Southampton, United Kingdom, 2015-09-09 - 2015-09-10
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 384506
URI: https://eprints.soton.ac.uk/id/eprint/384506
PURE UUID: c88a90d1-94a4-4337-887b-5d30f20e9d9f
ORCID for James Arnold: ORCID iD orcid.org/0000-0003-1987-515X
ORCID for Michael Griffin: ORCID iD orcid.org/0000-0003-0743-9502

Catalogue record

Date deposited: 27 Nov 2015 13:51
Last modified: 01 Aug 2018 00:36

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