THE ACOUSTIC AND STRUCTURAL CHARACTERISTICS OF UNDERSEA RADOMES.
Abstract
One concept currently under study to minimize the dimensional distortions in a suspended underwater acoustic sensing system is to enclose the sensors in an inflated spherical envelope. Evaluation of this concept must include consideration of the acoustic and structural performance of the inflated sphere. As a first step in examining acoustic properties, the sphere is approximated locally by a plane layer. Part I discusses a plane harmonic acoustic wave incident on an infinite plane layer separating two semi-infinite regions of fluid. The reflection and transmission of the incident wave and the response produced in the layer are investigated. The incident wave is transmitted only slightly diminished at most angles of incidence, but transmission is greatly reduced at one critical angle. Part II discusses a plane acoustic wave incident on a spherical envelope in an infinite region of fluid. The incident wave is affected only slightly by the presence of the sphere, with small variations in amplitude and phase found inside the sphere. Preliminary structural considerations involve the approximate material properties, thickness, and internal pressurization required to maintain a spherical shape within rather stringent deflection tolerances. In Part III the static response of an inflated sphere to buoyancy, dead weight, mooring and steady inviscid laminar-flow current loadings is examined. In Part IV the dynamic response is studied, particularly that resulting from impulsive loading. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 30, 1966
- Accession Number
- AD0828930
Entities
People
- A. G. Lubowe
- C. B. Loutzenheiser
- D. A. Sonstegard