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      Tactile perception by friction induced vibrations

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      Author
      Fagiani, R.
      Massi, F.
      Chatelet, E.
      Berthier, Y.
      Akay, A.
      Date
      2011
      Source Title
      Tribology International
      Print ISSN
      0301-679X
      Volume
      44
      Issue
      10
      Pages
      1100 - 1110
      Language
      English
      Type
      Article
      Item Usage Stats
      154
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      211
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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.
      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
      Permalink
      http://hdl.handle.net/11693/21797
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.triboint.2011.03.019
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      • Department of Mechanical Engineering 277
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