Introducing Whole Finger Effects in Surface Haptics: An Extended Stick-Slip Model Incorporating Finger Stiffness

Dennis Babu, Masashi Konyo, Hikaru Nagano, Satoshi Tadokoro

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The kinematic serial chain configuration of a finger modulates the frictional properties during tactile exploration tasks. This paper analyzes and subsequently models the effects of the entire finger during sliding operations on a surface. Qualitative and quantitative study of finger movement patterns with postures, sliding directions, and contact angles first indicate the effect of finger stiffness on contact mechanics. A 'stiffness ellipse' is subsequently modeled to incorporate finger pose effects, and then coupled with the lumped mass-spring-damper model of the finger pad to estimate resultant contact forces. The performance of the proposed model is verified by comparing with experimental results obtained from 10 subjects. The proposed model could estimate the general tendencies of contact forces with change in postures (Extended and Flexed), sliding directions (proximal and distal), and contact angles (20° 40°, and 60°). The experimental results indicates that finger stiffness significantly modulates the contact forces, stick-slip frequency, preloading duration, and initial spike during sliding. Introduction of finger posture effects could explain the change in finger normal force during tactile exploration tasks. The proposed haptic rendering model can be used to give a more natural user feedback in virtual fingertip-surface interactions.

Original languageEnglish
Article number8292944
Pages (from-to)417-430
Number of pages14
JournalIEEE Transactions on Haptics
Issue number3
Publication statusPublished - 2018 Jul 1


  • finger pad
  • finger posture
  • finger stiffness
  • friction
  • haptic rendering
  • stick-slip motion
  • stiffness ellipse
  • Tactile exploration


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