Tactile perception by friction induced vibrations

Date
2011
Authors
Fagiani, R.
Massi, F.
Chatelet, E.
Berthier, Y.
Akay, A.
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Source Title
Tribology International
Print ISSN
0301-679X
Electronic ISSN
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Volume
44
Issue
10
Pages
1100 - 1110
Language
English
Type
Article
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Abstract

When a finger moves to scan the surface of an object (haptic sensing), the sliding contact generates vibrations that propagate in the finger skin activating the receptors (mechanoreceptors) located in the skin, allowing the brain to identify objects and perceive information about their properties. The information about the surface of the object is transmitted through vibrations induced by friction between the skin and the object scanned by the fingertip. The mechanoreceptors transduce the stress state into electrical impulses that are conveyed to the brain. A clear understanding of the mechanisms of the tactile sensing is fundamental to numerous applications, like the development of artificial tactile sensors for intelligent prostheses or robotic assistants, and in ergonomics. While the correlation between surface roughness and tactile sensation has already been reported in literature, the vibration spectra induced by the finger-surface scanning and the consequent activation of the mechanoreceptors on the skin have received less attention. In this paper, frequency analysis of signals characterizing surface scanning is carried out to investigate the vibration spectrum measured on the finger and to highlight the changes shown in the vibration spectra as a function of characteristic contact parameters such as scanning speed, roughness and surface texture. An experimental set-up is developed to recover the vibration dynamics by detecting the contact force and the induced vibrations; the bench test has been designed to guarantee reproducibility of measurements at the low amplitude of the vibrations of interest, and to perform measurements without introducing external noise. Two different perception mechanisms, as a function of the roughness wavelength, have been pointed out. The spectrum of vibration obtained by scanning textiles has been investigated. © 2011 Elsevier Ltd. All rights reserved.

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Keywords
Friction induced vibrations, Roughness, Tactile perception, Textiles, Bench tests, Contact forces, Contact parameters, Electrical impulse, Experimental setup, External noise, Finger skin, Frequency Analysis, Friction induced vibration, Induced vibrations, Low-amplitude, Mechanoreceptors, Reproducibilities, Robotic assistants, Scanning speed, Sliding contacts, Stress state, Surface scanning, Surface textures, Tactile perception, Tactile sensation, Tactile sensing, Tactile sensors, Vibration dynamics, Vibration spectra, Chemical activation, Ergonomics, Friction, Intelligent robots, Scanning, Surface roughness, Textiles, Tribology, Vibration analysis
Citation
Published Version (Please cite this version)