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Tendon sheath analysis for estimation of distal end force and elongation for sensorless distal end

Published online by Cambridge University Press:  10 February 2010

S. J. Phee ,
S. C. Low ,
P. Dario  and
A. Menciassi
S. J. Phee*
Affiliation:
Nanyang Technological University, School of Mechanical and Aerospace Engineering, 50 Nanyang Ave, Singapore639798
S. C. Low
Affiliation:
Nanyang Technological University, School of Mechanical and Aerospace Engineering, 50 Nanyang Ave, Singapore639798
P. Dario
Affiliation:
Scuola Superiore Sant'Anna, CRIM
A. Menciassi
Affiliation:
Scuola Superiore Sant'Anna, CRIM
*
*Corresponding author. E-mail: msjphee@ntu.edu.sg
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Summary

Tendon sheath actuation is found in many applications, particularly in robotic hands and surgical robots. Due to the friction between the tendon and sheath, many undesirable characteristic such as backlash, hysteresis and non-linearity are present. It is desirable to know the end-effector force and elongation of the tendon to control the system effectively, but it is not always feasible to fix sensors at the end effector. A method to estimate the end-effector parameters using only a force and position sensor at the proximal site is given. An analytical study is presented and experiments are reported to support the result, showing a maximum full-scale error of approximately 7%. This result is achieved if the shape of the sheath remains the same and buckling is negligible. The results presented in this study could contribute towards haptic development in robotics surgery.

Keywords

Surgical RobotsGraspingForce ControlSerial Manipulator Design and KinematicsHaptic Interfaces
Type
Article
Information
Robotica , Volume 28 , Issue 7 , December 2010 , pp. 1073 - 1082
Copyright
Copyright © Cambridge University Press 2010

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