Accession Number:

ADA255227

Title:

Surface Impedance Modification of Plates in a Water-Filled Waveguide

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB ORLANDO FL UNDERWATER SOUND REFERENCE DIV

Personal Author(s):

Report Date:

1992-01-01

Pagination or Media Count:

6.0

Abstract:

The interaction of parallel waves, propagating in a water-filled cylindrical wave-guide, with a plate perpendicular to its axis is determined by the plates specific acoustic impedance, the product of density and wave speed. By means of an attached piezoelectric disk-shaped double transducer, sensor and actuator, the apparent surface impedance of the plate is modified to equal the impedance of the medium, thus establishing a no-reflection situation. The actuator voltage is regulated by a feedback loop, based on an algorithm for complex-root finding.

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE