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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11402
Title: Effects of posture and vibration magnitude on seat to head transmissibility during exposure to fore-and-aft vibration
Authors: Bhiwapurkar M.K.
Saran V.H.
Harsha S.P.
Published in: Journal of Low Frequency Noise Vibration and Active Control
Abstract: An experimental study has been conducted on the vibration simulator, developed as a mockup of a railway vehicle. In this paper, the effect of variations in the posture and vibration magnitude on head motions in three translational directions (fore-and-aft, lateral and vertical) are studied with seat vibration in fore-and-aft direction. Thirty healthy male subjects are exposed to random vibration with three vibration magnitudes of 0.4, 0.8 and 1.2 m/s2 r.m.s. over the frequency range 1–20 Hz. The data results are analyzed in terms of seat-to-head transmissibility (STHT) in two sitting postures; backrest and forward lean. Vibration measurements of the head motions are made with an apparatus (bite-bar). The study confirms that the measured responses to single fore-and-aft axis vibration have shown notable cross-axis responses. An increase in the excitation magnitude consistently revealed a decrease in the response peak magnitude and the corresponding resonant frequency, particularly in the presence of a back support. Such non-linear behavior has been interpreted as a non-linear softening effect in the muscle tension under increasing intensity of vibration. The use of a back support significantly alters the biodynamic responses of the seated body, which is attributable to the constraint due to the backrest support. © The Author(s) 2018.
Citation: Journal of Low Frequency Noise Vibration and Active Control (2019), 38(2): 826-838
URI: https://doi.org/10.1177/1461348418756019
http://repository.iitr.ac.in/handle/123456789/11402
Issue Date: 2019
Publisher: SAGE Publications Inc.
Keywords: biodynamic response
bite bar
rail vehicle
seat to head transmissibility
Whole body vibration
ISSN: 14613484
Author Scopus IDs: 36633921800
6507475582
6603548398
Author Affiliations: Bhiwapurkar, M.K., Department of Mechanical Engineering, O.P. Jindal University, Raigarh, CG, India
Saran, V.H., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India
Harsha, S.P., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India
Funding Details: The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The financial assistance received from DST, New Delhi for the research work is duly acknowledged.
Corresponding Author: Bhiwapurkar, M.K.; Department of Mechanical Engineering, O.P. Jindal UniversityIndia; email: mahesh.bhiwapurkar@opju.ac.in
Appears in Collections:Journal Publications [ME]

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