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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11325
Title: Effect of magnitudes and directions (mono-axis and multi-axis) of whole body-vibration exposures and subjects postures on the sketching performance
Authors: Bhiwapurkar M.K.
Saran, V. Huzur
Harsha, Suraj Prakash
Goel V.K.
Berg M.
Published in: Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit
Abstract: Whole-body vibrations in trains are known to affect the performance of sedentary activities such as reading, writing, sketching, working on a computer, etc. The objective of the study was to investigate the extent of disturbance perceived in sketching task by seated subjects in two postures under mono- and multi-axis Gaussian random vibration environment. The study involved 21 healthy male subjects in the age group of 23-32 years. Random vibrations were generated both in mono- and multi-axial directions in the frequency range of 1-10 Hz at 0.5, 1.0, and 1.5 m/s2 rms (root mean square) amplitude. The subjects were required to sketch given geometric figures such as a circle, triangle, rectangle, and square with the help of ball-point pen under given vibration stimuli in two postures (sketch pad on lap and sketch pad on table). The deviation in distortion with respect to the given figure is represented in terms of percentage distortion. The influence of vibrations on the sketching activity was investigated both subjectively and by two specifically designed objective methods, namely, RMS (root mean square methodology) and area methods. The judgements of perceived difficulty to sketch were rated using seven-point semantic judgement scale. The percentage distortion and difficulty in sketching activity increased with an increase in vibration magnitude. Both subjective evaluation and the RMS method revealed that the task was affected more while sketching on the table. The percentage distortion was affected similarly and maximum in all the vibration directions except for the vertical, while sketching difficulty was found to be higher only with longitudinal and multi-axis vibration direction. The subjective evaluation also revealed that there was no effect of the type of entity chosen on the sketching difficulty.
Citation: Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit (2011), 225(1): 71-83
URI: https://doi.org/10.1243/09544097JRRT336
http://repository.iitr.ac.in/handle/123456789/11325
Issue Date: 2011
Keywords: distortion in sketching
multi-axis random vibration
sedentary activities
whole-body vibration
ISSN: 9544097
Author Scopus IDs: 36633921800
6507475582
6603548398
56269524700
7202002535
Author Affiliations: Bhiwapurkar, M.K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarkhand 247667, India
Saran, V.H., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarkhand 247667, India
Harsha, S.P., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarkhand 247667, India
Goel, V.K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarkhand 247667, India
Berg, M., Department of Vehicle Engineering, Royal Institute of Technology, Stockholm, Sweden
Corresponding Author: Bhiwapurkar, M. K.; Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarkhand 247667, India; email: mbhiwapurkar@gmail.com
Appears in Collections:Journal Publications [ME]

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