A Torsion-Bending Antagonistic Bistable Actuator Enables Untethered Crawling and Swimming of Miniature Robots  

作　　者：Nan Hu Bo Li Ruiyu Bai Kai Xie Guimin Chen 

机构地区：[1]State Key Laboratory for Manufacturing Systems Engineering and Shaanxi Key Laboratory of Intelligent Robots,School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China [2]School of Aerospace Science and Technology,Xidian University,Xi’an 710126,China

出　　处：《Research》2023年第4期609-618,共10页研究（英文）

基　　金：This work was supported by the National Key Research and Development Program of China(grant 2019YFB1311600,G.C.and B.L.);the National Science Foundation of China(grants U1913213[G.C.]and 52075411[B.L.]).

摘　　要：Miniature robots show great potential in exploring narrow and confined spaces to perform various tasks,but many applications are limited by the dependence of these robots on electrical or pneumatic tethers to power supplies outboard.Developing an onboard actuator that is small in size and powerful enough to carry all the components onboard is a major challenge to eliminate the need for a tether.Bistability can trigger a dramatic energy release during switching between the 2 stable states,thus providing a promising way to overcome the intrinsic limitation of insufficient power of small actuators.In this work,the antagonistic action between torsional deflection and bending deflection in a lamina emergent torsional joint is utilized to achieve bistability,yielding a buckling-free bistable design.The unique configuration of this bistable design enables integrating of a single bending electroactive artificial muscle in the structure to form a compact,self-switching bistable actuator.A low-voltage ionic polymer-metal composites artificial muscle is employed,yielding a bistable actuator capable of generating an instantaneous angular velocity exceeding 300°/s by a 3.75-V voltage.Two untethered robotic demonstrations using the bistable actuator are presented,including a crawling robot(gross weight of 2.7 g,including actuator,battery,and on-board circuit)that can generate a maximum instantaneous velocity of 40 mm/s and a swimming robot equipped with a pair of origami-inspired paddles that swims breaststroke.The low-voltage bistable actuator shows potential for achieving autonomous motion of various fully untethered miniature robots.

关 键 词：robot YIELDING torsional 

分 类 号：TP242[自动化与计算机技术—检测技术与自动化装置]