Accession Number : AD0756776

Title :   Ueper Akustische Nahfelder von Triebwerksstrahlen (Near-Sound Fields of Jets),

Corporate Author : DEUTSCHE FORSCHUNGSANSTALT FUER LUFT- UND RAUMFAHRT E V BRUNSWICK (WEST GERMANY) INSTITUT FUER STRAHLANTRIEBE

Personal Author(s) : Dahlen,Helmut

Report Date : 1963

Pagination or Media Count : 7

Abstract : Some results of experimental investigations in the near noise field of a model hot jet are compared with theoretical results on the basis of Franz's extension of the Lighthill theory on near noise fields of stationary and convected quadrupoles; partially good agreement has been obtained. The effects of the geometrical and the induced near noise fields, the distribution of low frequency sound sources on the jet axis, and the effect of sound source convection are described. (Author Modified Abstract)

Descriptors :   (*STRUCTURES, FATIGUE(MECHANICS)), (*JET ENGINE NOISE, STRUCTURES), AIRCRAFT NOISE, ENGINE NOISE, SOUND TRANSMISSION, ATTENUATION

Subject Categories : Aircraft
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE