Accession Number:

ADA609227

Title:

High Frequency Target Strength Predictions

Descriptive Note:

Contract rept.

Corporate Author:

MARTEC LIMITED HALIFAX (NOVA SCOTIA)

Personal Author(s):

Report Date:

2007-02-01

Pagination or Media Count:

66.0

Abstract:

This report describes the contract addressing the need to extend the current capabilities of DRDC s AVAST software in order to provide a modelling tool suitable for predicting radiated noise and target strength of realistic ship structures. In this work, the contractor developed, as input, high fidelity models of both the Canadian Patrol Frigate and CFAV Quest. For the purpose of acoustic target strength prediction, these models included sufficient detail to allow for predictions at 50 kHz. In terms of radiated noise, the contractor developed a methodology for predicting hull surface accelerations, internal structural vibrations, and internal compartment radiated noise up to approximately 50 Hz due to an idealized acoustic source simulating propeller cavitation. The contractor investigated discrepancies between the Kirchhoff and conventional BIEM formulations when used for predicting torpedo target strength. In addition, the contractor provided a capability for including a nominal propeller model when predicting the medium-to-high-frequency target strength of a submarine or torpedo.

Subject Categories:

  • Statistics and Probability
  • Computer Programming and Software
  • Marine Engineering
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE