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Mechanical Sciences An open-access journal for theoretical and applied mechanics

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Mech. Sci., 8, 323-335, 2017
https://doi.org/10.5194/ms-8-323-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
15 Nov 2017
Toward force detection of a cable-driven micromanipulator for a surgical robot based on disturbance observer
Wenjie Wang, Lingtao Yu, and Jing Yang College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin, 150001, China
Abstract. Force sensing plays an important role in minimally invasive surgery (MIS). Force sensing makes it possible for the surgeon to feel the tissue properties and apply an appropriate level force and avoid tissue damage. The micromanipulators are compact and to allow appropriate disinfection, it is inappropriate to integrate sensors at the end of the micromanipulator. In this study, a new asymmetric cable-driven type of micromanipulator for a surgical robot was designed, and a joint angle estimator (JAE) was designed based on the dynamical model of the single cable-driven joint. Closed-loop control of the joint angle was carried out by regarding the JAE output as the feedback signal. On this basis, an external force estimator was designed using a disturbance observer (DOB). The experimental results show an average accuracy of the joint angle estimator of about −0.150°, with excellent control precision, the largest absolute error of about 0.95°, and an average error of 0.175°. The accuracy of the force estimator was at a high level during static loading. The estimated accuracy was 94 % at external force is greater than 1 N, and the estimated accuracy was 82 % for an external force of 0.3 N. These results predict that force sensing of a cable-driven micromanipulator in this paper can used to realize the micromanipulator's force feedback of a minimally invasive surgical robot.

Citation: Wang, W., Yu, L., and Yang, J.: Toward force detection of a cable-driven micromanipulator for a surgical robot based on disturbance observer, Mech. Sci., 8, 323-335, https://doi.org/10.5194/ms-8-323-2017, 2017.
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Short summary
Force sensing plays an important role in minimally invasive surgery. In this study, a new asymmetric cable-driven type of micromanipulator for a surgical robot was designed, and a joint angle estimator(JAE) was designed based on the dynamical model system. Closed-loop control of the joint angle was carried out by regarding the JAE output as the feedback signal. An external force estimator was designed using a disturbance observer. The experimental results shown the correctness and validity.
Force sensing plays an important role in minimally invasive surgery. In this study, a new...
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