Book Description
The ionic polymer-metal composite (IPMC) is a new practical engineering material that has a wide range of capabilities in both dry and liquid environments. IPMCs are refarded as capable actuators. They possess unique combination of electrochemical and mechanical properties, but, some behaviors, such as back-relaxation, restrain their use. There have been several attempts to understand and model the IPMCs properties. Yet, till now, it seems that the dehydration and back-relaxation have not been modeled properly. A mathematical model called the Nernst-Planck-Poisson equation (NPP) was chosen as the starting model in identifying the IPMC behavior. Then, the model was modified so it can truly account for the back-relaxation effects that occur in IPMCs. Verification using finite element methods confirmed the validity of the NPP system of equations to model the ion exchange that occurs within the IPMCS. The model modification used captured data from the experimental work using samples that were produced using a new and optimized method to manufacture IPMC. The new method showed decrease in production time and cost along with better actuation performance. The modified analytical NPP (Nernst-Planck-Poisson) model was verified using Matlab & Simulink, which showed that the model, and the controller design for it, was able to first compensate for the loss of position of the IPMC due to back-relaxation, and then track the desired position input signals with great accuracy. The model and the designed controller can be used in various mechatronic applications.