Acoustic scattering by a cylinder near a pressure release surface

TL;DR

This study develops a self-consistent method to analyze how a cylinder's acoustic scattering is affected by a nearby pressure-release surface, revealing frequency-dependent enhancement or reduction in scattering.

Contribution

A novel self-consistent approach for modeling multiple scattering interactions between a cylinder and a pressure-release surface is introduced.

Findings

Surface proximity can significantly alter scattering amplitude.

Scattering is either enhanced or reduced depending on frequency and cylinder properties.

Results apply to both air-filled and rigid cylinders.

Abstract

This paper presents a study of acoustic scattering by a cylinder of either infinite or finite length near a flat pressure-release surface. A novel self-consistent method is developed to describe the multiple scattering interactions between the cylinder and the surface. The complete scattering amplitude for the cylinder is derived from a set of equations, and is numerically evaluated. The results show that the presence of the surface can either enhance or reduce the scattering of the cylinder, depending on the frequency, the composition of the cylinder, and the distance between the cylinder and the surface. Both air-filled and rigid cylinders are considered.