Design and Analysis of a Symmetric Joint Module for a Modular Wire-Actuated Robotic Arm with Symmetric Variable-Stiffness Units

Author:

Qian Can1,Yang Kaisheng12,Ruan Yangfei1,Hu Junhao1,Shao Zixuan1,Wang Chongchong3,Xie Chuanqi4

Affiliation:

1. Zhejiang Key Laboratory of Part Rolling Technology, Ningbo University, Ningbo 315211, China

2. Department of Automation, Shanghai Jiao Tong University, Shanghai 200240, China

3. AUBO (Beijing) Robotic Technology Company, Beijing 100195, China

4. State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Animal Husbandry and Veterinary Science, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China

Abstract

Collaborative robots are used in scenarios requiring interaction with humans. In order to improve the safety and adaptability of collaborative robots during human–robot interaction, this paper proposes a modular wire-actuated robotic arm with symmetric variable-stiffness units. The variable-stiffness unit is employed to extend the stiffness-adjustment range of the robotic arm. The variable-stiffness unit is designed based on flexure, featuring a compact and simple structure. The stiffness–force relationship of the variable-stiffness unit can be fitted by a quadratic function with an R-squared value of 0.99981, indicating weak nonlinearity. Based on the kinematics and stiffness analysis of the symmetric joint module of the robotic arm, the orientation of the joint module can be adjusted by regulating the length of the wires and the stiffness of the joint module can be adjusted by regulating the tension of the wires. Because of the actuation redundancy, the orientation and stiffness of the joint module can be adjusted synchronously. Furthermore, a direct method is proposed for the stiffness-oriented wire-tension-distribution problem of the 1-DOF joint module. A simulation is carried out to verify the proposed method. The simulation result shows that the deviation between the calculated stiffness and the desired stiffness was less than 0.005%.

Funder

Public Welfare Technology Research Program of Zhejiang Province, China

Public Welfare Technology Research Program of Ningbo City, China

Key Research and Development Program of Ningbo City, China

Publisher

MDPI AG

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