Analysis on Grasping Ability for a Soft Robotic Hand with Structural Decoupling of Actuator and Variable Stiffness Mechanisms

doi:10.3969/j.issn.1004-132X.2023.01.004

Abstract

Abstract: To realize the accurate grasp of soft hand with variable stiffness， a soft robotic finger with the structural decoupling of actuator and variable stiffness mechanisms was designed. The fingertip force models of soft finger were built and the fingertip forces of finger were calculated. The comparison between the experimental results and simulation ones of the fingertip forces validated that the grasping models might accurately predict the grasping behavior within a certain range of deflections. The structure sizes of the soft robotic hands were designed based on the fingertip force models of the soft finger. According to the designed structure of the soft robotic hands， the grasping ability of the finger pulp was further studied， and eventually the grasping force models of the finger pulp grasp of the soft robotic hand were obtained through the mutual verification of simulation and experiment. Simulation and experimental results show that the grasping capability of soft robotic hands was related to the stiffness of fingers， actuating ability from deformation and the grasping types.

Key words: , soft robotic hand, variable stiffness, actuator, structural decoupling, fingertip force

摘要： 为了实现变刚度驱动软体手的精确抓取，设计了一款结构解耦型的变刚度驱动（变刚度与变形驱动）软体手指。建立了软体手指的指尖力模型，并计算了手指指尖力，将实验测试的手指指尖力数据与计算结果进行比较，证明了手指指尖力模型在一定精度范围内能够预测手指的抓握行为。基于软体手指的指尖力模型对软体手的结构尺寸进行设计，并根据设计的软体手进一步研究指腹的抓握能力，通过仿真与实验的相互印证得到了软体手指腹抓取的抓握力模型。仿真和实验结果表明，软体手的抓握能力与手指的刚度、变形驱动能力以及软体手的抓握形态有关。

关键词: 软体手, 变刚度, 驱动, 结构解耦, 指尖力

CLC Number:

TP241

YIN Haibin, TAO Jian, LI Qian, ZHOU Jia, . Analysis on Grasping Ability for a Soft Robotic Hand with Structural Decoupling of Actuator and Variable Stiffness Mechanisms[J]. China Mechanical Engineering, 2023, 34(01): 27-35.

尹海斌, 陶鉴, 李骞, 周佳, . 一种结构解耦型变刚度驱动软体手抓握能力分析[J]. 中国机械工程, 2023, 34(01): 27-35.

References

［1］茅一春，朱向阳，李顺冲，等. 一种新型欠驱动拟人机械手的设计［J］. 机械设计与研究， 2008， 24（3）：33-38.
MAO Yichun， ZHU Xiangyang， LI Shunchong， et al. Design of a New Underactuated Prosthetic Hand［J］， Machine Design & Research， 2008， 24（3）：33-38.
［2］LOW J H， ANG M H， YEOW C H. Customizable Soft Pneumatic Finger Actuators for Hand Orthotic and Prosthetic Applications［C］∥IEEE International Conference on Rehabilitation Robotics. Singapore， 2015：380-385.
［3］王超. 线驱动硅胶软体机械臂建模与控制［D］. 上海：上海交通大学， 2015.
WANG Chao. Dynamics and Control of Cable-driven Silicone Soft Manipulator［D］. Shanghai：Shanghai Jiao Tong University， 2015.
［4］李健，熊锋，史佳俊，等. SMA丝驱动的仿象鼻柔性机械手的研究［J］. 微特电机， 2014， 42（9）：10-14.
LI Jian， XIONG Feng， SHI Jiajun， et al. Research on Bionic Trunk Manipulator Driven by SMA Wires［J］. Small & Special Electrical Machines， 2014， 42（9）：10-14.
［5］王颜，房立金. 机械式仿骨骼肌变刚度机构原理及设计［J］. 机器人， 2015（4）：506-512.
WANG Yan， FANG Lijin. Principle and Design of Mechanically Musculoskeletal Variable-stiffness Mechanism［J］. Robot， 2015（4）：506-512.
［6］HART D， LAGOUDAS D. Aerospace Applications of Shape Memory Alloys［J］. Proc. of the Institution of Mech. Eng. ， Part G：Journal of Aerospace Engineering， 2007， 221（4）：535-552.
［7］PETTERSSON A， DAVIS S， GRAY J O， et al. Design of a Magnetorheological Robot Gripper for Handling of Delicate Food Products with Varying Shapes［J］. Journal of Food Engineering， 2010， 98（3）：332-338.
［8］SHINTAKE J， SCHUBERT B， ROSSET S， et al. Variable Stiffness Actuator for Soft Robotics Using Dielectric Elastomer and Low-melting-point Alloy［C］∥ IEEE/RSJ International Conference on Intelligent Robots and Systems. Hamburg， 2015：1097-1102.
［9］RATNA D， KARGER-KOCSIS J. Recent Advances in Shape Memory Polymers and Composites：a Review［J］. Journal of Materials Science， 2008， 43（1）：254-269.
［10］YAMANO M， GOTO D， UJIIE K， et al. Experiments of a Variable Stiffness Robot Using Shape Memory Gel［C］∥ IEEE/SICE International Symposium on System Integration. Kobe， 2013：647-652.
［11］HAO Y， WANG T， FANG X， et al. A Variable Stiffness Soft Robotic Gripper with Low-melting-point Alloy［C］∥Control Conference（CCC）， 2017 36th Chinese. Dalian， 2017：6781-6786.
［12］WEI Y， CHEN Y， REN T， et al. A Novel， Variable Stiffness Robotic Gripper Based on Integrated Soft Actuating and Particle Jamming［J］. Soft Robotics， 2016， 3（3）：134-143.
［13］LI J， ZU L， ZHONG G， et al. Stiffness Characteristics of Soft Finger with Embedded SMA Fibers［J］. Composite Structures， 2017， 160：758-764.
［14］YIN H， QIAN L， LI J， et al. Investigate of Grasping Force for a Soft Robot Hand under Pulling Force and Varying Stiffness［C］∥ International Conference on Intelligent Robotics & Applications. Wuhan， 2017.

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