The loss of hand functions in upper limb amputees severely restricts their mobility in daily life.Wearing a humanoid prosthetic hand would be an effective way of restoring lost hand functions.In a prosthetic hand design,replicating the natural and dexterous grasping functions with a few actuators remains a big challenge.In this study,a function-oriented optimization design(FOD)method is proposed for the design of a tendon-driven humanoid prosthetic hand.An optimization function of different functional conditions of full-phalanx contact,total contact force,and force isotropy was constructed based on the kinetostatic model of a prosthetic finger for the evaluation of grasping performance.Using a genetic algorithm,the optimal geometric parameters of the prosthetic finger could be determined for specific functional requirements.Optimal results reveal that the structure of the prosthetic finger is significantly different when designed for different functional requirements and grasping target sizes.A prosthetic finger was fabricated and tested with grasping experiments.The mean absolute percentage error between the theoretical value and the experimental result is less than 10％,demonstrating that the kinetostatic model of the prosthetic finger is effective and makes the FOD method possible.This study suggests that the FOD method enables the systematic evaluation of grasping performance for prosthetic hands in the design stage,which could improve the design efficiency and help prosthetic hands meet the design requirements.

Yue ZHENG;Xiangxin LI;Lan TIAN;Guanglin LI

CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems,Shenzhen Institutes of Advanced Technology(SIAT),Chinese Academy of Sciences(CAS),Shenzhen 518055,China;Shenzhen College of Advanced Technology,University of Chinese Academy of Sciences,Shenzhen 518055,China;SIAT Branch,Shenzhen Institute of Artificial Intelligence and Robotics for Society,Shenzhen 518055,China;Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems,Shenzhen 518055,China

机械工程前沿

[1]Yue ZHENG;Xiangxin LI;Lan TIAN;Guanglin LI-.Function-oriented optimization design method for underactuated tendon-driven humanoid prosthetic hand)[J].机械工程前沿,2022(03):73-87

phalanx,kinetostatic

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