Haptic display of constrained dynamic systems via admittance displays

Eric L. Faulring*, Kevin M. Lynch, J. Edward Colgate, Michael A. Peshkin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


In the Cobotic Hand Controller, we have introduced an admittance display that can render very high impedances (up to its own structural stiffness). This is due to its use of infinitely variable transmissions. While admittance displays typically excel at rendering high impedances, the incorporation of infinitely variable transmissions in the Cobotic Hand Controller allows the stable display of a wide dynamic range, including low impedances. The existence of a display that excels at rendering high-impedance constraints, but has high-fidelity control of low impedances tangent to those constraints, has led us to describe an admittance control architecture not often examined in the haptics community. In this paper, we develop a comprehensive approach that enables rendering of rigid motion constraints while simultaneously preserving the physical integrity of the intended inertial dynamics tangent to those constraints. This is in contrast to conventional impedance-control algorithms that focus primarily on rendering reaction forces along contact normals with constraints. We present this algorithm here, which is general to all admittance displays, and report on its implementation with the Cobotic Hand Controller. We offer examples of rigid bodies and linkages subject to holonomic and/or nonholonomic constraints.

Original languageEnglish (US)
Pages (from-to)101-111
Number of pages11
JournalIEEE Transactions on Robotics
Issue number1
StatePublished - Feb 2007


  • Admittance display
  • Cobots
  • Constrained dynamic systems
  • Haptics
  • Nonholonomic

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering

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