Abstract
Acoustic source emission rate is generally low at low frequencies. In this work, we propose a simple design of ‘LEGO’-type acoustic metamaterial that can significantly enhance the low frequency emission rate of an acoustic monopole source. Such enhancement is resulted from the coupling between resonances of a cavity and a dual grating comprised of two concentric layers of periodically distributed narrow slits. We develop an effective medium model to characterize the enhancement. Because of its simple structure, the metamaterial is easy to fabricate and thus facilitates the applications in various domains such as oil exploration.
Highlights
We propose a simple ‘LEGO’-type design of an acoustic metamaterial to enhance the low frequency source radiation
This observation provides a design principle to achieve enhanced source emission at low frequencies: by introducing proper in-between cavities. Such principle is fundamentally different from the strategy proposed previously in ref.[6], where the low frequency feature is mainly contributed by the elongated acoustic path in the labyrinthine structure
We propose a simple ‘LEGO’-type design of acoustic metamaterial that comprises a dual grating structure to enhance the acoustic source emission rate at low frequencies
Summary
All the numerical simulations presented in this article are performed using. COMSOL Multiphysics, a commercial package based on the finite-element method. Sound hard boundary conditions are imposed on the boundaries of the steel annuli
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