| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 97 === According to the piezoelectric effects, piezoelectric materials have been widely used in all kinds of devices including ultrasonic devices, reverse sensors, and cooling fans. These applications require goals such as high electromechanical energy conversion and thus raising electromechanical coupling coefficient (Kd) becomes a major consideration. In this study, we integrate piezoelectric theory analysis and finite element method to deduce piezoelectric beam element capable of simulating piezoelectric devices. By using the deduced element, we simulated the static displacement of the piezoelectric beam. The results agreed with the results simulated from ABAQUS. Furthermore, we design the widely used piezoelectric fans by using the deduced element to optimize Kd. The results agreed with the results derived from the analytical method. For the piezoelectric actuator, using evolutionary structural optimization (ESO) and the so-called mode tracking method to design the topology of piezoelectric actuator with optimized Kd.
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