农业机械学报2024，Vol.55Issue(1)：436-445,458,11.DOI:10.6041/j.issn.1000-1298.2024.01.042
混合阻塞变刚度软手指设计与实验
Design and Experiment of Hybrid Jamming Variable Stiffness Soft Finger
摘要
Abstract
In order to improve the grasping effect on complex shaped objects of the variable stiffness soft robotic arm with a single jamming medium,inspired by the structure of human fingers,a variable stiffness soft finger with hybrid jamming methods imitating the finger pulp structure was designed.It was a double-layer structure,where the outer layer was used for a pneumatic actuator,and the inner layer was used for a variable stiffness layer with hybrid jamming methods based on active layer jamming and passive particle jamming methods,which can facilitate the soft fingers to fit the profiles of objects grasped automatically,and achieve the effects of passive adaptation under active driving,and objects grasping reliably by stiffness adjustment.Based on the traditional sewing techniques,the soft fingers were manufactured with hyperelastic silicone material.A stiffness control model for multi-material soft fingers based on cantilever beam structure was established by using Euler-Bernoulli beam theory and virtual work principle,furthermore,a selection rule to increase the overall material stiffness was proposed based on the stiffness control model.Experimental results on bendability showed the excellent bendability of the soft fingers.Besides,the stiffness variation and objects grasping experimental results showed that the stiffness of the soft fingers with hybrid jamming method was increased by 4.6 times,and the maximum relative error of the stiffness control model established was only 3.4％.Despite of increasing the surface roughness of the objects grasped,the detachment force of the soft fingers was still increased by 17％,which reached 1.7 N.Therefore,compared with the soft fingers with single jamming medium,the grasp success rate and load capacity were improved significantly.关键词
软手指/变刚度/混合阻塞/层干扰Key words
soft finger/variable stiffness/hybrid jamming/layer jamming分类
信息技术与安全科学引用本文复制引用
李东民,马文平,王雨,方佳琪,张国辉,丁国伟..混合阻塞变刚度软手指设计与实验[J].农业机械学报,2024,55(1):436-445,458,11.基金项目
国家自然科学基金项目(52174145)、山东省自然科学基金项目(ZR2021MF120、ZR2020MF101)、山东省高等学校科技计划项目(J18KB020)和泰安市科技创新发展项目(2021GX052) （52174145）
