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Dynamic Modeling and Control of Small Scale Wire Driven Robotic Joints with Wire Elasticity

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In this paper, dynamic modeling and control of small scale wire driven robotic joints (WDRJ) with elastic wires is studied in detail. In the dynamic modeling, it is assumed that the dominant dynamics of wires which are the longitudinal vibrations of the wires can be approximated by a linear axial spring model. Moreover, the dynamic model of the WDRJ is converted to the standard form of singular perturbation, which allows the controller design on the base of the singular perturbation theory. The proposed control scheme consists of two major parts, slow and fast sub-controllers. First, a slow sub-controller is designed by considering WDRJ with ideal rigid wires, which is used to control the gross motion of the WDRJ. Then, this controller is extended to the WDRJ with elastic wires by adding the fast sub-controller, to counteract the longitudinal vibrations caused by the inevitable elasticity of the wires. Furthermore, to ensure all the wires remain in tension, the proposed control strategy is refined by adding the concept of internal force. Finally, the efficiency of the proposed control algorithm is investigated through simulations. And it is demonstrated that WDRJ is an appealing candidate for the design of small scale robotic system.
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Keywords: ANTAGONISTIC ROBOTIC JOINTS; SINGULAR PERTURBATION APPROACH; SLOW AND FAST CONTROL; SMALL SCALE WIRE DRIVEN ROBOTIC JOINTS

Document Type: Research Article

Publication date: September 1, 2018

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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