Modeling Backlash-Like Hysteresis of Tendon Sheath Mechanism-Pair

Junho Hong, Dahie Hong, Byung Gon Kim

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Tendon sheath mechanism (TSM) is an effective power transmission system to access remote locations through tortuous channels, and it is widely used in endoscopic surgical robots. However, owing to deformation of TSM during power transmission, the input-output hysteresis is expressed in the form of backlash-like hysteresis. This paper is premised on the idea that sheath deformation can occur if the sheath is fixed only at certain points rather than being fully fixed at all points. Based on our hypothesis, a new TSM-pair backlash-like hysteresis model was derived, which considers the deformation property of the sheath. Experimental setups were designed to validate the new model, and its mechanical parameters were identified. The experimental results revealed that the sheath significantly deforms and that such deformation produces backlash-like hysteresis together with the tendon deformation. This model can be used to provide accurate prediction and control of TSM.

Original languageEnglish
Article number041012
JournalJournal of Mechanisms and Robotics
Issue number4
Publication statusPublished - 2020 Aug 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korean Government (Grant No. NRF-2017R1C1B2006425)

Publisher Copyright:
© 2020 American Society of Mechanical Engineers (ASME). All rights reserved.


  • actuators and transmissions
  • cable-driven mechanisms
  • compliant mechanisms
  • medical robotics

ASJC Scopus subject areas

  • Mechanical Engineering


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