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Development and dynamics of a novel couple-constrained parallel wrist with three measuring force flexible fingers

Published online by Cambridge University Press:  16 June 2023

Yang Lu*
Affiliation:
College of Mechanical Engineering, Yanshan University, Qinhuangdao, Hebei, 066004, PR China Harbin Electric Corporation (Qinhuangdao) Heavy Equipment Company Limited, Qinhuangdao, Hebei, 066004, PR China
Zefeng Chang
Affiliation:
College of Mechanical Engineering, Yanshan University, Qinhuangdao, Hebei, 066004, PR China
Yi Lu*
Affiliation:
College of Mechanical Engineering, Yanshan University, Qinhuangdao, Hebei, 066004, PR China
*
Corresponding authors: Yi Lu, Yang Lu; Emails: luyi@ysu.edu.cn, deersheepxn@163.com
Corresponding authors: Yi Lu, Yang Lu; Emails: luyi@ysu.edu.cn, deersheepxn@163.com

Abstract

A novel couple-constrained parallel wrist with three measuring force flexible fingers is designed for grabbing heavy objects and measuring grabbed forces. Its prototype is developed, its dynamics model is established, and its grabbing forces are measured. First, using the extended formulas of the skew-symmetric matrix, the kinematic formulas are derived for solving the Jacobian/Hessian matrices and the general velocity/acceleration of the moving links in the couple-constrained parallel wrist. Second, a dynamics model is established for solving the dynamic actuation forces, the couple-constrained forces, and the torque in the couple-constrained parallel wrist. Third, the theoretical solutions of the kinematics/dynamics of the couple-constrained parallel wrist are verified using a simulation mechanism. Finally, the grabbing forces of the three flexible fingers are measured and analyzed.

Type
Research Article
Copyright
© The Author(s), 2023. Published by Cambridge University Press

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