Flow noise in planar sonar applications

TL;DR

This paper presents an analytical model for flow noise in planar sonar systems, capturing the complex coupling of hydrodynamic, bending, and acoustic waves without simplifying assumptions, validated by sea trial data.

Contribution

It introduces the first analytical solution based on a biorthogonal system for flow noise modeling in sonar applications.

Findings

The model accurately predicts flow noise generation and propagation.

Validation with sea trial data confirms the model's effectiveness.

Abstract

In this paper an investigation of flow noise in sonar applications is presented. Based on a careful identification of the dominant coupling effects, the acoustic noise at the sensor position resulting from the turbulent wall pressure fluctuations is modelled with a system of hydrodynamic, bending and acoustic waves. We describe for the first time an analytical solution of the problem which is based on a biorthogonal system which can be solved in the spectral domain without the usual simplifying assumptions. Finally, it is demonstrated that the analytical solution describes the flow noise generation and propagation mechanisms of the considered sea trials.