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Broadband acoustic lens design by reciprocity and optimization
Feruza A Amirkulova1, Samer Gerges1, Andrew N Norris2
1Mechanical Engineering Department, San José State University, San José, California 95192, USA.
JASA Express Letters
|September 26, 2022
Summary
Researchers designed a broadband acoustic lens using reciprocity and optimization. This method enhances acoustic focusing by intelligently arranging scatterers for improved sound pressure at the focal point.
Area of Science:
- Acoustics
- Metamaterials
- Optimization
Background:
- Acoustic lenses focus sound waves.
- Designing efficient acoustic lenses is challenging.
- Broadband performance is desirable for many applications.
Purpose of the Study:
- To design a broadband acoustic lens.
- To utilize acoustic reciprocity and gradient-based optimization.
- To maximize acoustic pressure at the focal point.
Main Methods:
- Applied the principle of acoustic reciprocity.
- Used gradient-based optimization to rearrange scatterers.
- Calculated gradients of absolute pressure with respect to scatterer positions.
Main Results:
- Successfully designed a broadband acoustic lens.
- Demonstrated maximization of pressure at the focal point.
- Provided numerical examples for cylindrical voids and elastic thin shells in water.
Conclusions:
- The proposed method enables effective broadband acoustic focusing.
- Gradient-based optimization is a viable approach for acoustic lens design.
- The designed lens shows potential for applications requiring enhanced sound pressure focusing.
