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Sensors 2017, 17(10), 2257; https://doi.org/10.3390/s17102257

A Novel Position Compensation Scheme for Cable-Pulley Mechanisms Used in Laparoscopic Surgical Robots

State Key Laboratory of Robotics and System, Harbin Institute of Technology, 2 Yikuang Street, Harbin 150080, China
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Received: 10 August 2017 / Revised: 26 September 2017 / Accepted: 27 September 2017 / Published: 30 September 2017
(This article belongs to the Section Physical Sensors)
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Abstract

The tendon driven mechanism using a cable and pulley to transmit power is adopted by many surgical robots. However, backlash hysteresis objectively exists in cable-pulley mechanisms, and this nonlinear problem is a great challenge in precise position control during the surgical procedure. Previous studies mainly focused on the transmission characteristics of the cable-driven system and constructed transmission models under particular assumptions to solve nonlinear problems. However, these approaches are limited because the modeling process is complex and the transmission models lack general applicability. This paper presents a novel position compensation control scheme to reduce the impact of backlash hysteresis on the positioning accuracy of surgical robots’ end-effectors. In this paper, a position compensation scheme using a support vector machine based on feedforward control is presented to reduce the position tracking error. To validate the proposed approach, experimental validations are conducted on our cable-pulley system and comparative experiments are carried out. The results show remarkable improvements in the performance of reducing the positioning error for the use of the proposed scheme. View Full-Text
Keywords: cable-pulley system; backlash hysteresis; position compensation; support vector machine cable-pulley system; backlash hysteresis; position compensation; support vector machine
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Liang, Y.; Du, Z.; Wang, W.; Sun, L. A Novel Position Compensation Scheme for Cable-Pulley Mechanisms Used in Laparoscopic Surgical Robots. Sensors 2017, 17, 2257.

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