Abstract：The structure and control system of micro robot fish are designed based on the properties of the IPMC (ionic polymer metal composite) after analyzing locomotion and force of small fish. Then efficiency improvement of the IPMC is discussed, and various locomotion patterns are realized on the micro robot fish. The experimental results prove that an IPMC based centimeter scale micro robot fish is feasible. The velocity control can be realized by changing frequency and duty ratio of the control signal, and ascent-descent, turning, cruising can be realized by the cooperation of pectoral fin and caudal fin. Finally, this paper analyzes how to improve propulsive efficiency from the viewpoint of structure design of the caudal fin propulsor.
 Fukuda T,Kawamoto A,Arai F,et al.Steering mechanism of underwater micro mobile robot[C]//IEEE International Conference on Robotics and Automation.Piscataway,NJ,USA:IEEE,1995:363-368.
 Fukuda T,Hosokai H,Kikuchi I.Distributed type of actuators by shape memory alloy and its application to underwater mobile robotic mechanism[C]//IEEE International Conference on Robotics and Automation.Piscataway,NJ,USA:IEEE,1990:1316-1321.
 Mojarrad M,Shahinpoor M.Biomimetic robot propulsion using polymeric artificial muscles[C]//IEEE International Conference on Robotics and Automation.Piscataway,NJ,USA:IEEE,1997:2152-2157.
 Shahinpoor M.Conceptual design,kinematics and dynamics of swimming robotic structures using ionic polymeric gel muscles[J].Smart Materials and Structures,1992,1(1):91-94.
 杭观荣,王振龙,李健,等.基于柔性鳍单元的尾鳍推进微型机器鱼设计研究[J].机器人,2008,30(2):171-175,181.Hang Guanrong,Wang Zhenlong,Li Jian,et al.Development of a caudal-fin-propelled micro robot fish based on flexible fins[J].Robot,2008,30(2):171-175,181.
 Shahinpoor M,Kim K J.Ionic polymer-metal composites:Ⅰ.Fundamentals[J].Smart Materials and Structures,2001,10(4):819-833.
 Guo S X,Fukuda T,Asaka K.A new type of fish-like underwater mierorobot[J].IEEE/ASME Transactions on Mechatronics,2003,8(1):136-141.
 Kim B,Kim D H,Jung J H,et al.A biomimetic undulatory tadpole robot using ionic polymer-metal composite actuators[J].Smart Materials and Structures,2005,14(6):1579-1585.
 Tan X B,Kim D,Usher N,et al.An autonomous robotic fish for mobile sensing[C]//IEEE/RSJ International Conference on Intelligent Robots and Systems.Piscataway,NJ,USA:IEEE,2006:5424-5429.
 Ye X E Su Y D,Guo S X.Infrared motion guidance and obstacle avoidance of an ICPF actuated underwater microrobot[C]//IEEE International Conference on Mechatronics and Automation.Piscataway,NJ,USA:IEEE,2007:1851-1856.
 Ye X E Su Y D,Guo S X.A centimeter-scale autonomous robotic fish actuated by IPMC actuator[C]//IEEE International Conference on Robotics and Biomimetics.Piscataway,NJ,USA:IEEE,2007:262-267.
 Ye X E Su Y D,Guo S X,et al.Design and realization of a remote control centimeter-scale robotic fish[C]//IEEE/ASME International Conference on Advanced Intelligent Mechatronics.Piscataway,NJ,USA:IEEE,2008:25-30.
 Ye X E Su Y D,Guo S X,et al.ICPF actuator-based novel type of 3D swimming microrobot[C]//IEEE International Conference on Mechatronics and Automation.Piscataway,NJ,USA:IEEE,2008:557-562.
 Sfakiotakis M,Lane D M,Davies J B C.Review offish swimming modes for aquatic locomotion[J].IEEE Journal of Ocean Engineering,1999,24(2):237-252.
 Hu H S,Liu J D,Dukes I,et al.Design of 3D swim patterns for autonomous robotic fish[C]//IEEE International Conference on Intelligent Robots and Systems.Piscataway,N J,USA:IEEE,2006:2406-2411.
 Lighthill M J.Note on the swimming of slender fish[J].Journal of Fluid Mechanics,1960,9(2):305-317.
 沈辉.人工肌肉(IPMC)的性能研究[D].南京:南京航空航天大学,2006.Shen Hui.Investigation on characteristics of artificial muscle (IPMC)[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2006.
 Shahinpoor M,Kim K J,Mojarrad M.Artificial muscles:Applications of advanced polymeric nanocomposites[M].Boca Raton,USA:Taylor ＆ Francis,2007.
 Kim K J,Shahinpoor M.Ionic polymer-metal composites:Ⅱ.Manufacturing techniques[J].Smart Materials and Structures,2003,12(1):65-79.