# Structural Optimization and Performance of a Low-Frequency Double-Shell Type-IV Flexural Hydroacoustic Transducer

## TL;DR

Researchers designed and tested a double-shell hydroacoustic transducer to improve low-frequency performance in water.

## Contribution

A novel double-shell type-IV transducer design with optimized parameters for low-frequency hydroacoustic applications.

## Key findings

- The transducer achieved a resonant frequency of 740 Hz and a maximum transmitting voltage response of 130 dB in simulation.
- Physical testing confirmed a resonant frequency of 750 Hz and a transmitting voltage response of 129.25 dB, matching simulation results.
- The prototype's maximum linear dimension was 250 mm, meeting design requirements.

## Abstract

To amplify the displacement of the radiation shell, a double-shell type-IV curved hydroacoustic transducer was proposed. Through Ansys finite element simulation, the vibration modes of the transducer in different stages and the harmonic response characteristics in air and water were studied, and the bandwidth emission of the hydroacoustic transducer was achieved. By optimizing the size of each component, the resonant frequency of the transducer is 740 Hz, the maximum conductivity was 0.66 mS, and the maximum transmitting voltage response was 130 dB. According to the optimized parameters, a longitudinal acoustic transducer prototype was manufactured, and a physical test was conducted in an anechoic pool. The obtained resonant frequency was 750 Hz, the maximum conductivity was 0.44 mS, the maximum transmitting voltage response was 129.25 dB, and the maximum linear dimension was 250 mm, which match the simulated value of the virtual prototype and meet the expected requirements.