Accession Number:

ADA551196

Title:

Remote Acoustical Mine Neutralization Using Back-Propagated Shock Waves

Descriptive Note:

Annual rept.

Corporate Author:

WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB

Personal Author(s):

• Kargl, Steven G.

Report Date:

1998-01-01

Pagination or Media Count:

6.0

Abstract:

The feasibility of using focused shock waves for mine neutralization requires a detailed understanding of nonlinear wave propagation in water. This project investigates several fundamental issues of nonlinear acoustics when the primary source configuration is a discrete array of intense sources. Questions addressed through the theoretical analysis and an experimental effort concern the applicability of linear superposition and beamforming for performance predictions. The main objectives for this project include two fundamental aspects of nonlinear wave propagation from a discrete array. First, the question of linear superposition of nonlinear acoustic fields from discrete sources is investigated. Given independent fields from each source in a collection of sources, can these fields be superposed to predict the field from an array The second objective investigates the nonlinear acoustic field produced by an array of discrete sources where beamforming is important. That is, can the initial phase of each element in the array be adjusted to provide a beamforming capability Both theoretical and experimental research efforts were carried out where the experiments provide partial validation and confirmation for the conclusions of the theoretical work.

Descriptors:

• *ACOUSTIC ARRAYS
• *ACOUSTIC WAVES
• *MINE NEUTRALIZATION
• *NONLINEAR PROPAGATION ANALYSIS
• *SHOCK WAVES
• *UNDERWATER MINES
• *WAVE PROPAGATION
• ACOUSTIC BEAMS
• ACOUSTIC FIELDS
• BEAM FORMING

Subject Categories:

• Undersea and Antisubmarine Warfare
• Underwater Ordnance
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE