Design of an underwater acoustic bend by pentamode metafluid

TL;DR

This paper presents a novel underwater acoustic bend using pentamode microstructure that achieves broadband bending and impedance matching, enhancing underwater communication and detection capabilities.

Contribution

The study introduces a new design of an underwater acoustic bend based on pentamode lattice, enabling simultaneous tuning of effective density and modulus for improved performance.

Findings

Achieves broadband acoustic bending with low wavefront distortion.

Provides high transmission efficiency indicating good impedance matching.

Demonstrates potential for practical underwater communication and detection applications.

Abstract

We design an impedance matching underwater acoustic bend with pentamode microstructure. The proposed bend is assembled by pentamode lattice. The effective density and compressive mod- ulus of each unit cell can be tuned simultaneously, which are modulated to guarantee both the bending effect and high transmission. The standard deviations of transmitted phase are calculated to quantitatively evaluate the degree of the distortion of the transmitted wavefront, while the trans- mission is calculated to appraise the degree of acoustic impedance matching. The low standard deviations and high transmission indicate that the designed bend has a nice broadband bending effect and is impedance-matched to water. This design has potential applications in underwater communication and underwater detection.