On the Design of an Acoustically Isolating Bubble Screen for the Carr Inlet Acoustic Range.
Abstract
The theoretical acoustic behavior of an underwater bubble screen was examined using Rayleigh reflection theory. A microcomputer model simulates the acoustic impedance mismatch at the interfaces of an ideal, bubble screen. A sensitivity analysis indicates that the angle of incidence of sound energy and the speed of sound in the layer are the most important screen properties for predicting the insulating capability of a bubble screen. In the neighborhood of frequencies for which the screen thickness is an integral number of half wavelengths, the interference results in a reduced reflection coefficient and a corresponding increase in transmission through the screen. So that for a broad band spectrum wide enough to cover a number of such frequencies, the attenuation to be expected exceeds 10 dB only over about 90 percent of the spectrum. The interest for this work came from the need for a noise insulating screen at the Carr Inlet Acoustic Range. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1981
- Accession Number
- ADA105830
Entities
People
- Kenneth William Marr
Organizations
- Naval Postgraduate School