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Response of the seated human body to whole-body vertical vibration: discomfort caused by mechanical shocks

Response of the seated human body to whole-body vertical vibration: discomfort caused by mechanical shocks
Response of the seated human body to whole-body vertical vibration: discomfort caused by mechanical shocks

The frequency dependence of discomfort caused by vertical mechanical shocks has been investigated with 20 seated males exposed to upward and downward shocks at 13 fundamental frequencies (1–16 Hz) and 18 magnitudes (±0.12 to ±8.3 ms−2). The rate of growth of discomfort with increasing shock magnitude depended on the fundamental frequency of the shocks, so the frequency dependence of equivalent comfort contours (for both vertical acceleration and vertical force measured at the seat) varied with shock magnitude. The rate of growth of discomfort was similar for acceleration and force, upward and downward shocks, and lower and higher magnitude shocks. The frequency dependence of discomfort from shocks differs from that of sinusoidal vibrations having the same fundamental frequencies. This arises in part from the frequency content of the shock. Frequency weighting Wb in BS 6841:1987 and ISO 2631-1:1997 provided reasonable estimates of the discomfort caused by the shocks investigated in this study. Practitioner Summary: No single frequency weighting can accurately predict the discomfort caused by mechanical shocks over wide ranges of shock magnitude, but vibration dose values with frequency weighting Wb provide reasonable estimates of discomfort caused by shocks similar to those investigated in this study with peak accelerations well below 1 g.

force, mechanical shocks, Ride comfort, shock magnitude
0014-0139
347-357
Zhou, Zhen
042d2983-fa7a-4c43-a1cf-475a81672c6d
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Zhou, Zhen
042d2983-fa7a-4c43-a1cf-475a81672c6d
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8

Zhou, Zhen and Griffin, Michael J. (2017) Response of the seated human body to whole-body vertical vibration: discomfort caused by mechanical shocks. Ergonomics, 60 (3), 347-357. (doi:10.1080/00140139.2016.1164902).

Record type: Article

Abstract

The frequency dependence of discomfort caused by vertical mechanical shocks has been investigated with 20 seated males exposed to upward and downward shocks at 13 fundamental frequencies (1–16 Hz) and 18 magnitudes (±0.12 to ±8.3 ms−2). The rate of growth of discomfort with increasing shock magnitude depended on the fundamental frequency of the shocks, so the frequency dependence of equivalent comfort contours (for both vertical acceleration and vertical force measured at the seat) varied with shock magnitude. The rate of growth of discomfort was similar for acceleration and force, upward and downward shocks, and lower and higher magnitude shocks. The frequency dependence of discomfort from shocks differs from that of sinusoidal vibrations having the same fundamental frequencies. This arises in part from the frequency content of the shock. Frequency weighting Wb in BS 6841:1987 and ISO 2631-1:1997 provided reasonable estimates of the discomfort caused by the shocks investigated in this study. Practitioner Summary: No single frequency weighting can accurately predict the discomfort caused by mechanical shocks over wide ranges of shock magnitude, but vibration dose values with frequency weighting Wb provide reasonable estimates of discomfort caused by shocks similar to those investigated in this study with peak accelerations well below 1 g.

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00140139.2016.1164902 - Accepted Manuscript
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Accepted/In Press date: 4 March 2016
e-pub ahead of print date: 22 March 2016
Published date: 2017
Keywords: force, mechanical shocks, Ride comfort, shock magnitude
Organisations: University of Southampton

Identifiers

Local EPrints ID: 406285
URI: http://eprints.soton.ac.uk/id/eprint/406285
ISSN: 0014-0139
PURE UUID: d768d602-379a-4f48-98cd-24ecf62068f9
ORCID for Michael J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

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Date deposited: 10 Mar 2017 10:44
Last modified: 07 Oct 2020 06:53

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Author: Zhen Zhou

University divisions

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