Abstract

This research presents an innovative asymmetric transmission design using alternate layers of water and metamaterial with complex mass density. The directional transmission behavior of acoustic waves is observed numerically inside the composite structure with gradient layer thickness distribution and the rectifying performance of the present design is evaluated. The layer thickness distributions with arithmetic and geometric gradients are considered and the effect of gradient thickness on asymmetric wave propagation is systematically investigated using finite element simulation. The numerical results indicate that the maximum pressure density and transmission through the proposed structure are significantly influenced by the wave propagation direction over a wide range of audible frequencies. Tailoring the thickness of the layered structure enables the manipulation of asymmetric wave propagation within the desired frequency range. In conclusion, the proposed design offers a new possibility for developing directional-dependent acoustic devices.

Highlights

  • In electronics, a diode is a two-terminal component with asymmetric conductance that can rectify current flux

  • This study presents a novel design of a directional-dependent acoustic transmission device that can serve as a wave rectifier

  • The proposed design is composed of alternate layers of water and metamaterial with complex mass density

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Summary

INTRODUCTION

A diode is a two-terminal component with asymmetric conductance that can rectify current flux. Comprising a resonant ring cavity biased by a circulating fluid can produce high nonreciprocity at audible frequencies.[12] this device is not practical for attenuating sound at higher frequencies This led to the development of a subwavelength ultrasonic circulator based on spatiotemporal modulation, providing a practical method of realizing large sound circulation at any desired frequency.[13] In addition to the aforementioned acoustic constructions, a statically compressed granular crystal containing a light mass defect near the boundary offers a new possibility for controlling the flow of energy.[14] Acoustic switches with wide operational frequency ranges and controllability can be attained by combining nonlinearity and bandgap effects in granular media.[15] The spatial asymmetry of the physical system is another method of generating one-way transmission. The effects of gradient thickness on rectifying efficiency are studied on the basis of finite element simulation

ACOUSTIC LAYERED STRUCTURES
ANALYSIS
CONCLUSIONS
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