Accession Number:

ADA463290

Title:

Dynamic Response of an Insonified Sonar Window Interacting with a Tonpilz Transducer Array

Descriptive Note:

Technical rept.

Corporate Author:

NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI

Personal Author(s):

Report Date:

2007-01-03

Pagination or Media Count:

38.0

Abstract:

This report derives and evaluates an analytical model of a sonar window in contact with an array of Tonpilz transducers. The window is fully elastic so that all wave components are present in the analysis. The system is insonified with a plane acoustic wave so that the sonar system is operating in an acoustic receive mode. The output of the model is a transfer function of a transducer element output voltage divided by input pressure versus arrival angle and frequency. This model is intended for analysis of sonar systems that are to be built or modified for broadband processing. The model is validated at low frequency with a comparison to a previously derived thin plate model. Once this is done, an example problem is studied so that the effects of higher order wave interaction with acoustic reception can be understood. It was found that these higher order waves can cause multiple nulls in the acoustic cone and that their locations in the arrival angle-frequency plane can be determined. The effect of these nulls in the beam pattern of the array is demonstrated. This analysis is beneficial because it shows where a sonar system can operate without being adversely effected by dynamic effects in the sonar window.

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE