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The vibration of inclined backrests: perception and discomfort of vibration applied parallel to the back in the z-axis of the body

The vibration of inclined backrests: perception and discomfort of vibration applied parallel to the back in the z-axis of the body
The vibration of inclined backrests: perception and discomfort of vibration applied parallel to the back in the z-axis of the body
This study determined how backrest inclination and the frequency of vibration influence the perception and discomfort of vibration applied parallel to the back (vertical vibration when sitting upright, horizontal vibration when recumbent). Subjects experienced backrest vibration at frequencies in the range 2.5 to 25 Hz at vibration magnitudes up to 24 dB above threshold. Absolute thresholds, equivalent comfort contours, and the principal locations for feeling vibration were determined with four backrest inclinations: 0° (upright), 30°, 60° and 90° (recumbent). With all backrest inclinations, acceleration thresholds and equivalent comfort contours were similar and increased with increasing frequency at 6 dB per octave (i.e. velocity constant). It is concluded that backrest inclination has little effect on the frequency dependence of thresholds and equivalent comfort contours for vibration applied along the back, and that the W d frequency weighting in current standards is appropriate for evaluating z-axis vibration of the back at all backrest inclinations.

Statement of Relevance: To minimise the vibration discomfort of seated people, it is necessary to understand how discomfort varies with backrest inclination. It is concluded that the vibration on backrests can be measured using a pad between the backrest and the back, so that it reclines with the backrest, and the measured vibration evaluated without correcting for the backrest inclination.
backrest angle, seat comfort, frequency weighting
1366-5847
1214-1227
Basri, B.
d7dd50c4-4820-4918-a8bb-cf270c34a36e
Griffin, M.J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Basri, B.
d7dd50c4-4820-4918-a8bb-cf270c34a36e
Griffin, M.J.
24112494-9774-40cb-91b7-5b4afe3c41b8

Basri, B. and Griffin, M.J. (2011) The vibration of inclined backrests: perception and discomfort of vibration applied parallel to the back in the z-axis of the body. Ergonomics, 54 (12), 1214-1227. (doi:10.1080/00140139.2011.624200). (PMID:22103729)

Record type: Article

Abstract

This study determined how backrest inclination and the frequency of vibration influence the perception and discomfort of vibration applied parallel to the back (vertical vibration when sitting upright, horizontal vibration when recumbent). Subjects experienced backrest vibration at frequencies in the range 2.5 to 25 Hz at vibration magnitudes up to 24 dB above threshold. Absolute thresholds, equivalent comfort contours, and the principal locations for feeling vibration were determined with four backrest inclinations: 0° (upright), 30°, 60° and 90° (recumbent). With all backrest inclinations, acceleration thresholds and equivalent comfort contours were similar and increased with increasing frequency at 6 dB per octave (i.e. velocity constant). It is concluded that backrest inclination has little effect on the frequency dependence of thresholds and equivalent comfort contours for vibration applied along the back, and that the W d frequency weighting in current standards is appropriate for evaluating z-axis vibration of the back at all backrest inclinations.

Statement of Relevance: To minimise the vibration discomfort of seated people, it is necessary to understand how discomfort varies with backrest inclination. It is concluded that the vibration on backrests can be measured using a pad between the backrest and the back, so that it reclines with the backrest, and the measured vibration evaluated without correcting for the backrest inclination.

Text
14692 BB-MJG 2011 Back_vibration_in_z-axis_of_body - Accepted Manuscript
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More information

Published date: 22 November 2011
Keywords: backrest angle, seat comfort, frequency weighting
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 337584
URI: https://eprints.soton.ac.uk/id/eprint/337584
ISSN: 1366-5847
PURE UUID: 8b6d32cd-5439-48e4-8794-36659fbf9a60
ORCID for M.J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

Catalogue record

Date deposited: 30 Apr 2012 09:14
Last modified: 20 Jul 2019 01:27

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Contributors

Author: B. Basri
Author: M.J. Griffin ORCID iD

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