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Structural Fatigue Due to Jet Noise

 

作者: Alan Powell,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1956)
卷期: Volume 28, issue 4  

页码: 782-782

 

ISSN:0001-4966

 

年代: 1956

 

DOI:10.1121/1.1905133

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

This is a new field concerning the aerodynamicist and acoustician, the vibration specialist, the metallurgist, and the structural designer: each aspect has to be investigated and welded together to form a general picture. Apart from purely scientific interest, a principal result of the work in this field should be guidance to the aircraft designer. The paper briefly considers these various aspects in the light of theoretical and experimental work that has been done or is in progress, and shows how a careful coordination between theoretical and experimental work is necessary, since several aspects appear to be beyond present theoretical methods. Essentially the problem as visualized at present necessitates (1) an experimental study to obtain certain pertinent quantities in the near pressure field of a jet (where “hydrodynamic” turbulent effects are important): the quantities are spectra of space‐time correlations which at present are only calculable far from the jet; (2) a theoretical step to estimate the effectiveness of the pressure field in exciting vibration, whose modes and damping are calculable in simple structures (but an experimental approach is necessary for most practical aircraft structures); and (3) finally use has to be made of cumulative damage concepts to estimate the fatigue life under these random vibrations, this step again involving much experimental work.

 

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