Accession Number : AD0712406

Title :   JET NOISE SUPPRESSION BY AN IMPEDANCE SHROUD,

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s) : Jones,Ian S. F.

Report Date : JUN 1970

Pagination or Media Count : 26

Abstract : Jet noise can be attenuated by shielding the observer from the noise sources with a sheet of fluid having a different acoustic impedance to the undisturbed atmosphere. The attenuation due to a heated sheet of gas lying on an arc centered on the axis of a subsonic jet was measured. The maximum noise reduction in certain frequency bands in this experiment was 10 dB. (Author)

Descriptors :   (*ACOUSTIC IMPEDANCE, GASES), (*JET PLANE NOISE, ATTENUATION), (*GASES, SOUND TRANSMISSION), SHIELDING, JETS, FLAMES

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE