Accession Number : AD0720714

Title :   Acoustic Radiation from Vibrating Prolate Spheroids.

Descriptive Note : Technical memo.,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB

Personal Author(s) : Lauchle,Gerald C.

Report Date : 03 JUN 1970

Pagination or Media Count : 83

Abstract : Prolate spheroidal coordinates and associated prolate spheroidal wave functions have been used to determine the acoustic radiation from prolate spheroids whose surfaces vibrate arbitrarily. The theory, originally developed to study the sound propagation from submerged spheroids, is general enough to include a wide range of specific acoustic problems such as radiation from nonspherical sources (cylinders with end caps, discs, etc.) and acoustic scattering. Boundary conditions are adjusted to the general solutions of the wave equation to obtain an expression for the sound pressure from which a local model radiation impedance was defined. The application of the theory is demonstrated through numerical calculations of the far-field acoustic radiation from a particular prolate spheroid for which experimental data was available. (Author)

Descriptors :   (*UNDERWATER SOUND, ACOUSTIC DETECTORS), (*SOUND TRANSMISSION, WAVE FUNCTIONS), ACOUSTICS, VIBRATION, ACOUSTIC IMPEDANCE, UNDERWATER OBJECTS, SPECIAL FUNCTIONS(MATHEMATICAL), THESES

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE