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Transducer design for low-frequency circular close-packed array and its mutual radiation analysis.

Qiumu Wang¹, Jun Fan¹, Yu Lan²

¹State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

The Journal of the Acoustical Society of America

|April 2, 2022

Summary

A new single-sided radiation flextensional transducer (SSR FT) design reduces mutual radiation effects in low-frequency circular arrays. This innovation enables smaller dimensions and enhanced performance for underwater acoustic sources.

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Area of Science:

Acoustics and Transducer Technology
Underwater Acoustics
Array Signal Processing

Background:

Conventional flextensional transducers offer low frequency, small size, and high power.
Low-frequency circular arrays of these transducers suffer from strong mutual radiation effects due to element proximity and large vibration amplitudes.
This mutual radiation limits the performance and miniaturization of such acoustic arrays.

Purpose of the Study:

To design a single-sided radiation flextensional transducer (SSR FT) for low-frequency circular arrays.
To mitigate the mutual radiation effect in close-packed circular transducer arrays.
To optimize the SSR FT's structural parameters for improved electroacoustic, vibration, and radiation performance.

Main Methods:

Analysis of the SSR FT's vibration principles to understand parameter effects.
Qualitative analysis of mutual radiation in arrays using resonant mass and equivalent circuits.
Numerical simulations and experimental testing of fabricated circular arrays.

Main Results:

The SSR FT design effectively reduces mutual radiation effects in circular arrays.
Arrays composed of SSR FTs exhibit weaker mutual radiation compared to conventional Class IV FT arrays.
The SSR FT arrays achieve smaller overall dimensions than their counterparts.

Conclusions:

The developed SSR FT is suitable for low-frequency, small-dimension circular arrays.
SSR FT arrays offer a solution to reduce mutual radiation in close-packed configurations.
This technology enhances flexibility for applications requiring compact, low-frequency underwater acoustic sources.