Accession Number : AD0691837

Title :   UNDERWATER SOUND SIGNATURES OF FLIGHT VEHICLES.

Descriptive Note : Status rept. no. 2,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB

Personal Author(s) : Baker,W. L. ; Macaluso,J. A.

Report Date : 15 JUL 1968

Pagination or Media Count : 20

Abstract : This report indicates the status of the development of a model and the analytical procedures to achieve accurate calculations of the underwater sound field characteristics of flight vehicles that operate over typical sea surfaces. Theoretical and experimental refraction studies involving acoustic plane-waves incident on a corrugated interface have resulted in a suitable mathematical model. Comparisons of the model and computations with experiment and theory for the underwater sound field resulting from plane-wave insonification of a flat, square section of the interface showed good agreement at 16 kHz and satisfactory agreement at 7 to 8 kHz. A more general model is being formulated to permit accurate simulation of the incident sound field produced by flight vehicles and to extend the definition of 'rough' surface to one of virtually any configuration. (Author)

Descriptors :   (*AIRCRAFT NOISE, UNDERWATER), (*ACOUSTIC SIGNALS, SOUND TRANSMISSION), SOUND, IMAGES, ACOUSTIC PROPERTIES, WAKE, TURBULENCE, MATHEMATICAL MODELS, ATMOSPHERES, WATER WAVES, INTERACTIONS

Subject Categories : Aircraft
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE