Structural Optimization of Power Flextensional Piezoelectric Actuator using FE Model and Genetic Algorithm

Sergey Shevtsov, Igor Zhilyaev, and Vladimir Axenov


Active control, Piezoelectric actuator, Structural optimization


This paper concerns a structural optimization problem for a flextensional piezoelectric actuator which consists of the high power piezoelectric stack and polymeric composite shell intended for amplification of the stroke. The principal drawback of the piezoelectric transducers is a very small stroke at relatively high operating force. In order to supply the required stroke some amplification means are used. The considered flextensional transducer allows obtaining needed stroke amplification, but because of counteracting forces the initial actuator’s stroke significantly reduced. The main aim of this article is the optimization of the actuator design to simultaneously provide sufficient stroke and stiffness, allowing counteract external loads. To do this, we parameterize the shape of the amplificator’s shell by the rational Bezier curves, which parameters (coordinates and weights of the control points) are changed iteratively by genetic algorithm according to the fitness function value calculated by the finite element model of the transducer with varied geometry of shell.

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