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Biodynamic Responses of the Seated Occupants to Multi-Axis Whole-Body Vibration

Title:

Biodynamic Responses of the Seated Occupants to Multi-Axis Whole-Body Vibration

Mandapuram, Santosh Chary (2012) Biodynamic Responses of the Seated Occupants to Multi-Axis Whole-Body Vibration. PhD thesis, Concordia University.

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Abstract

Occupational on-road and off-road vehicle operators are exposed to low frequency whole-body vibration (WBV) of comprehensive magnitudes, and have shown a high prevalence of back disorders. Characterisation of seated body biodynamics response is considered vital for assessing potential injury risks of WBV and for developing effective biomechanical models for integration in the primary and secondary suspension design processes. The seated body biodynamic responses to single axis vibration have been investigated widely under vertical axis and a few under individual horizontal axis. The responses to simultaneous three-axis vibration, as encountered during vehicle driving, however, have been investigated in two recent studies. In this dissertation research, the biodynamic responses of seated body exposed to single as well as multiple axis vibration are characterised in terms of the apparent mass (APMS), vibration power absorbed (VPA) and seat-to-head vibration transmissibility (STHT) responses with both hands and back supports. The APMS responses are characterised considering two-driving-points formed by the buttocks-pan and upper-body backrest interfaces to fully describe the body-seat interactions. This study proposes a method to determine the total seated body APMS response from the forces measured at the two-driving points. Furthermore, it is shown that the commonly used frequency-response-function (H1), would suppress the contributions of the cross-axis responses under uncorrelated simultaneous multi-axis excitations. Consequently an alternative frequency response estimator (Hv) is applied for analyses of responses to uncorrelated multi-axis. The results obtained, clearly revealed the contributions of cross-axis responses, which were not evident in the reported responses derived using H1 function estimator. Further, it is shown that the total response along an axis can be estimated from super position of the direct and cross-axis response components along the same axis.
The seat-to-head vibration (STHT) transmissibility responses are also obtained so as to obtain additional target functions for defining the biodynamic models. The STHT responses also revealed considerable coupling effects of multi-axis vibration, when Hv function estimator is applied. The total VPA of the body under multi-axis is further derived considering the power absorption attributed to cross-axis body responses. A methodology is proposed to derive frequency-weightings similar to those in ISO 2631-1 using the absorbed power responses. Thus derived weightings based on total responses of the seated body under multi-axis uncorrelated vibration, are proposed to better evaluate the vibration exposure risk due to the whole-body multi-axis vibration. The results of the study suggest that the frequency-weightings derived for the back supported postures differ substantially from the current standardised weighting. The current weighting is thus believed to be applicable only for back unsupported sitting conditions.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Thesis (PhD)
Authors:Mandapuram, Santosh Chary
Institution:Concordia University
Degree Name:Ph. D.
Program:Mechanical Engineering
Date:29 November 2012
Thesis Supervisor(s):Rakheja, Subhash and Boileau, Paul-Émile
Keywords:Human vibration, biodynamic seated body responses, multi-axis whole-body vibration
ID Code:975115
Deposited By: SANTOSH CHARY MANDAPURAM
Deposited On:17 Jun 2013 19:38
Last Modified:18 Jan 2018 17:39

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