Over-the-Rotor Liner Investigation via the NASA Langley Normal Incidence Tube [PDF]
NASA Langley and Glenn Research Centers have collaborated on the usage of acoustic liners mounted very near or directly over the rotor of turbofan aircraft engines.
Becker, Lawrence E +3 more
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Measurements of interactions between acoustic fields and nonuniform mean flow [PDF]
, 1980 Two problems crucial to the stability of longitudinal acoustic waves in solid rocket motors are examined experimentally. The first is the dissipation of energy associated with an average flow inward at the lateral boundary.
Awad, E. +4 more
core
Estudo das medidas de imitância acústica com tom sonda de 226 e 1000 Hz em neonatos
Audiology: Communication ResearchOBJETIVO: Estudar as medidas de volume, pressão do pico e complacência obtidas nas curvas timpanométricas de neonatos, na comparação entre gêneros e orelhas, utilizando tom sonda de 226 e 1000 Hz, e analisar as respostas obtidas na pesquisa dos reflexos ...
Bruna Noronha Teixeira +3 more
doaj
Analytical and experimental studies for predicting noise attenuation in acoustically treated ducts for turbofan engines [PDF]
Analytical and experimental studies for predicting noise attenuation in acoustically treated ducts for turbofan ...
Dean, L. W., III, Feder, E.
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Suppression of combustion oscillations with mechanical devices Interim report [PDF]
Static rocket thrust chamber simulator for cylindrical cold flow-type apparatus ...
Baldwin, C. D. +3 more
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An experimental study of the effects of water repellant treatment on the acoustic properties of Kevlar [PDF]
The treatment consisted of immersing samples of Kevlar in a solution of distilled water and Zepel. The samples were then drained, dried in a circulating over, and cured.
Parrott, T. L., Smith, C. D.
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Sound propagation in and radiation from acoustically lined flow ducts: A comparison of experiment and theory [PDF]
The results of an experimental and theoretical study of many of the fundamental details of sound propagation in hard wall and soft wall annular flow ducts are reported.
Burrin, R. H. +3 more
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Analysis, design, and test of acoustic treatment in a laboratory inlet duct [PDF]
A suppression prediction program based on the method of modal analysis for spinning mode propagation in a circular duct was used in the analytical design of optimized, multielement, Kevlar bulk-absorber treatment configurations for an inlet duct.
Gauden, W. H. +3 more
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Flyover-noise measurement and prediction [PDF]
, 1991 Details are presented for the measurement and prediction of aircraft flyover noise to be used for certification, research and development, community noise surveys, airport monitors, and pass fail criteria.
Peart, Noel A.
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, 2018 Acoustic dampers are efficient and cost-effective means for suppressing thermoacoustic instabilities in combustion chambers. However, their design and the choice of their purging air mass flow is a challenging task, when one aims at ensuring ...
Bourquard, Claire, Noiray, Nicolas
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