The University of Southampton
University of Southampton Institutional Repository

Response of the seated human body to whole-body vertical vibration: biodynamic responses to mechanical shocks

Response of the seated human body to whole-body vertical vibration: biodynamic responses to mechanical shocks
Response of the seated human body to whole-body vertical vibration: biodynamic responses to mechanical shocks

The biodynamic response of the seated human body has been investigated with 20 males exposed to upward and downward shocks at 13 fundamental frequencies (1–16 Hz) and 18 magnitudes (up to ±8.3 ms−2). For 1- and 2- degree-of-freedom models, the stiffness and damping coefficients were obtained by fitting seat acceleration waveforms predicted from the measured force to the measured seat acceleration waveform. Stiffness and damping coefficients were also obtained in the frequency domain with random vibration. The optimum stiffness and damping coefficients varied with the magnitude and the frequency of shocks. With both upward and downward shocks, the resonance frequency of the models decreased from 6.3 to 4 Hz as the vibration dose values of the shocks increased from 0.05 to 2.0 ms−1.75. The stiffness and damping obtained from responses to shocks were correlated with, and similar to, the stiffness and damping obtained with random vibration. Practitioner Summary: When modelling the dynamic response of the seated human body to vertical acceleration less than 1 g, the relation between force and acceleration can be well represented by a single degree-of-freedom model although the optimum stiffness and damping depend on the magnitude and frequency of sinusoidal, random or shock motion.

apparent mass, Biodynamics, force, mechanical shocks, nonlinearity
0014-0139
333-346
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: biodynamic responses to mechanical shocks. Ergonomics, 60 (3), 333-346. (doi:10.1080/00140139.2016.1179793).

Record type: Article

Abstract

The biodynamic response of the seated human body has been investigated with 20 males exposed to upward and downward shocks at 13 fundamental frequencies (1–16 Hz) and 18 magnitudes (up to ±8.3 ms−2). For 1- and 2- degree-of-freedom models, the stiffness and damping coefficients were obtained by fitting seat acceleration waveforms predicted from the measured force to the measured seat acceleration waveform. Stiffness and damping coefficients were also obtained in the frequency domain with random vibration. The optimum stiffness and damping coefficients varied with the magnitude and the frequency of shocks. With both upward and downward shocks, the resonance frequency of the models decreased from 6.3 to 4 Hz as the vibration dose values of the shocks increased from 0.05 to 2.0 ms−1.75. The stiffness and damping obtained from responses to shocks were correlated with, and similar to, the stiffness and damping obtained with random vibration. Practitioner Summary: When modelling the dynamic response of the seated human body to vertical acceleration less than 1 g, the relation between force and acceleration can be well represented by a single degree-of-freedom model although the optimum stiffness and damping depend on the magnitude and frequency of sinusoidal, random or shock motion.

Text
14791 ZZ-MJG 2017 Biodynamic_responses_to_vertical_mechanical_shocks - Accepted Manuscript
Download (1MB)

More information

Accepted/In Press date: 8 April 2016
e-pub ahead of print date: 20 May 2016
Published date: 2017
Keywords: apparent mass, Biodynamics, force, mechanical shocks, nonlinearity
Organisations: University of Southampton

Identifiers

Local EPrints ID: 406279
URI: http://eprints.soton.ac.uk/id/eprint/406279
ISSN: 0014-0139
PURE UUID: 5768e9fb-e0d3-402a-b52f-6dacd7f06270
ORCID for Michael J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

Catalogue record

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

Export record

Altmetrics

Contributors

Author: Zhen Zhou

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×