This thesis describes the open-loop behavior of an ionic polymer metal composite (IPMC) strip as a novel actuator, the empirical force and position models, the control system and the improved dynamic characteristics with the feedback control implemented. Ionic polymer metal composite is a novel polymer in the class of electroactive polymers. IPMC consists of a base polymer coated with electrodes made up of highly conducting pure metals such as gold. The actuation behavior of IPMC can be attributed to the bending of an IPMC strip upon application of voltage across its thickness. The main reasons for the bending are ion migration on the application of voltage and swelling and contraction caused by water content. An experimental setup to study the open-loop force and tip displacement of an IPMC strip in a cantilever configuration was developed, and real time controllers were implemented. In open loop, the force response of the IPMC strip of dimensions 25 mm x 3.9 mm x 0.16 mm to a 1.2-V step input is studied. The open-loop rise time was 0.08 s and the percent overshoot was 131.62 %, while the settling time was about 10 s. Based on this open-loop step response using a least-square curve-fitting methodology, a fourth-order empirical transfer function from the voltage input to the force output was derived. The tip displacement response of an IPMC strip of dimensions 23 mm x 3.96 mm x 0.16 mm to a 1.2-V step input was also studied. The step response exhibited a 205.34 % overshoot with a rise time of 0.08 s, and the settling time was 27 s. A fourth-order empirical transfer function from the step input to the tip displacement as output was also derived. Based on the derived transfer functions lead-lag feedback controllers were designed for precision control of both force and displacement. The control objectives were to decrease the settling time and the percent overshoot, and achieve reference input tracking. After implementing the controllers, the percent overshoot decreased to 30% while the settling time was reduced to 1.5 s in case of force control. With position control, the settling time was reduced to 1 s while the percent overshoot decreased to 20%. Precision micro-scale force and position-control capabilities of the IPMC were also demonstrated. A 4 [mu]N force resolution was achieved, with a force noise of 0.904-[mu]N rms. The position resolution was 20 [mu]m with a position noise of 7.6-[mu]m rms.

This book focuses on electro active polymer material known as Ionic Polymer Metal Composite (IPMC) having unique applicability as sensor and actuator which finds extensive use in various domain of engineering and science research. Apart from fundamentals of the IPMC concept, various applications are covered extensively across the chapters including space, underwater and nanoscale, including manufacturing processes. Dedicated chapters are included for robotics and biomedical applications and possible research gaps. Future research perspectives for IPMC are also discussed. Features: Covers principle of Ionic Polymer Metal Composite (IPMC), manufacturing processes, applications, and future possibilities in a systematic manner Highlights IPMC practical applicability in biomedical engineering domain Explores Single-walled carbon nanotubes (SWNT) based IPMC soft actuators Discusses IPMC applications in underwater areas Includes IPMC application in robotics focusing on special compliant mechanism This book is aimed toward researchers, graduate students and professionals in materials and mechanical engineering, robotics, mechatronics, biomedical engineering, and physics.

This book discusses the fundamental of bending actuation with a focus on ionic metal composites. It describes the applications of ionic polymer metal composite (IPMC) actuators, from conventional robotic systems to compliant micro robotic systems used to handle the miniature and fragile components during robotic micro assembly. It also presents mathematical modelings of actuators for engineering, biomedical, medical and environmental systems. The fundamental relation of IPMC actuators to the biomimetic systems are also included.

A comprehensive resource on ionic polymer metal composites (IPMCs) edited by the leading authority on the subject.

Ionic polymer metal composites (IPMCs) can generate a voltage when physically deformed. Conversely, an applied small voltage or electrical field can induce an array of spectacular large deformation or actuation behaviours in IPMCs, such as bending, twisting, rolling, twirling, steering and undulating. An important smart material, IPMCs have applications in energy harvesting and as self-powered strain or deformation sensors, they are especially suitable for monitoring the shape of dynamic structures. Other uses include soft actuation applications and as a material for biomimetic robotic soft artificial muscles in industrial and medical contexts. This comprehensive volume on ionic polymer metal composites provides a broad coverage of the state of the art and recent advances in the field written by some of the world’s leading experts on various characterizations and modeling of IPMCs. Topics covered in this two volume set include uses in electrochemically active electrodes, electric energy storage devices, soft biomimetic robotics artificial muscles, multiphysics modeling of IPMCs, biomedical applications, IPMCs as dexterous manipulators and tactile sensors for minimally invasive robotic surgery, self-sensing, miniature pumps for drug delivery, IPMC snake-like robots, IPMC microgrippers for microorganisms manipulations, Graphene-based IPMCs and cellulose-based IPMCs or electroactive paper actuators (EAPap). Edited by the leading authority on IMPCs, the broad coverage will appeal to researchers from chemistry, materials, engineering, physics and medical communities interested in both the material and its applications.