Abstract
This paper concerns the optimization problem for multilayered ultrasonic transducer with active porous piezoelectric layer. The dependences of the effective moduli for porous piezoelectric material on porosity have been previously obtained and allowed to decrease the number of design variables. The multiobjective optimization problem based on the Pareto-frontier calculation has been solved using the live-link of finite-element (FE) package Comsol Multiphysics with MATLAB.
Highlights
Porous piezoceramic materials are widely used in medical imaging, ultrasonic transducers, hydrophones and other piezoelectric devices
A large number of investigations are referred to the development of effective structures for acoustic transducers based on the porous piezoelectric materials due to their high piezoelectric sensitivity, extended frequency bandwidth and better matching to the acoustic medium
In our investigation we considered three objectives: sound pressure level (SPL) in direct ray measured at the 1m distance from the sound source and transmitting current response (TCR) to be maximized; the deviation of SPL is to be minimized
Summary
Porous piezoceramic materials are widely used in medical imaging, ultrasonic transducers, hydrophones and other piezoelectric devices. The effective method for getting over this difficulty is the use of porous piezoelectric ceramics This entails both decreased number of intermediate layers and better acoustic agreement between the transducer and medium. As the optimized objectives we introduce averaged sound pressure level (SPL), transmitting current response (TCR) and the mean-square value of the SPL irregularity in frequency range from 100 to 400 kHz. The design variables are: Young’s modules of an acoustic window layer, protective foam layer, and matching layer; mass damping parameter and stiffness damping parameter of layers; porosity of an active piezoelectric layer. The design variables are: Young’s modules of an acoustic window layer, protective foam layer, and matching layer; mass damping parameter and stiffness damping parameter of layers; porosity of an active piezoelectric layer In this investigation we use the approach based on the Pareto-frontier calculation, i.e. building the set of points in the 6D space of design variables where all the objectives are feasible. Obtained data and proposed methods might be effectively used for the structural optimization of enough wide range of transducers
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