Abstract
In order to improve the fabrication efficiency and performance of an ultrasonic transducer (UT), a particle swarm optimization (PSO) algorithm-based design method was established and combined with an electrically equivalent circuit model. The relationship between the design and performance parameters of the UT is described by an electrically equivalent circuit model. Optimality criteria were established according to the desired performance; then, the design parameters were iteratively optimized using a PSO algorithm. The Pb(ZrxTi1−x)O3 (PZT) ceramic UT was designed by the proposed method to verify its effectiveness. A center frequency of 6 MHz and a bandwidth of −6 dB (70%) were the desired performance characteristics. The optimized thicknesses of the piezoelectric and matching layers were 255 μm and 102 μm. The experimental results agree with those determined by the equivalent circuit model, and the center frequency and −6 dB bandwidth of the fabricated UT were 6.3 MHz and 68.25%, respectively, which verifies the effectiveness of the developed optimization design method.
Highlights
Pezoelectric ultrasonic transducers (UTs), as common energy conversion devices, have been widely used in nondestructive testing [1,2,3], ultrasonic positioning, [4,5] medical imaging and diagnoses [6,7,8]
A particle swarm optimization (PSO) algorithm-based design method for UTs was developed combined with the equivalent circuit model (ECM)
The ECM was utilized to describe the effects of design parameters on the performance of the UT
Summary
Pezoelectric ultrasonic transducers (UTs), as common energy conversion devices, have been widely used in nondestructive testing [1,2,3], ultrasonic positioning, [4,5] medical imaging and diagnoses [6,7,8]. The fabricated ultrasonic transducer had good emission and reception performance in the specific frequency range of 20–80 KHz. Using the COMSOL Multiphysics software, Chen et al [20] designed a cone-shaped, ultrasonic transducer for three-dimensional ultrasonic positioning; it had a larger beam width and fewer receivers than commercial piezoelectric ceramic UT. Using the COMSOL Multiphysics software, Chen et al [20] designed a cone-shaped, ultrasonic transducer for three-dimensional ultrasonic positioning; it had a larger beam width and fewer receivers than commercial piezoelectric ceramic UT In these traditional optimization design methods, the design parameters generally come from trial and error [21,22,23,24], which relies heavily on expert experience, greatly increasing the time and cost of the development cycle. It can be combined with an optimization algorithm to develop an effective design method for UTs
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