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3 April 2012 A dynamic physics-based model for base-excited IPMC sensors
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In this paper a dynamic, physics-based model is studied analytically and experimentally for an ionic polymermetal composite (IPMC) sensor that is excited at the base. This work is motivated by structural monitoring and energy-harvesting applications of IPMCs. The model combines the vibration dynamics of a flexible beam under base excitation and the ion transport dynamics within the IPMCs. The vibration dynamics of a base-excited IPMC beam is obtained from the Euler-Bernoulli beam equation incorporating damping and accommodating suitable boundary conditions. The charge dynamics is derived by analytically solving the governing partial differential equation, which captures electrostatic interactions, ionic diffusion and ionic migration along the thickness direction. The derived model relating short-circuit sensing current to the base excitation is expressed as an infinite-dimensional transfer function, in terms of physical and geometric parameters, and is thus scalable. The model is then reduced to a finite-dimensional one for real-time signal processing. In particular, we present an inversion scheme for reconstructing the mechanical stimuli given the sensor output. Experimental results show that the proposed model captures well both the beam dynamics and the overall sensing dynamics. Simulation results are also presented to illustrate the inversion algorithm.
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Chaiyong Lim, Hong Lei, and Xiaobo Tan "A dynamic physics-based model for base-excited IPMC sensors", Proc. SPIE 8340, Electroactive Polymer Actuators and Devices (EAPAD) 2012, 83400H (3 April 2012);

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