Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Jeffrey Hilton"'
Autor:
Jeffrey Hilton Miles
Publikováno v:
The Journal of the Acoustical Society of America. 129:3068-3081
Combustion noise from turbofan engines has become important, as the noise from sources like the fan and jet are reduced. An aligned and un-aligned coherence technique has been developed to determine a threshold level for the coherence and thereby hel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b20562345c29af51dd4ac749504c9d7f
https://doi.org/10.1121/1.3546097
https://doi.org/10.1121/1.3546097
Autor:
Jeffrey Hilton Miles
Publikováno v:
Journal of Propulsion and Power. 26:303-316
Cross-correlation and coherence functions are used to look for periodic acoustic components in turbofan engine combustor time histories, to investigate direct and indirect combustion noise source separation based on signal propagation time delays, an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cbca60a6da78df26bf1e277c767536a8
https://doi.org/10.2514/1.42980
https://doi.org/10.2514/1.42980
Autor:
Jeffrey Hilton Miles
Publikováno v:
Journal of Propulsion and Power. 25:218-227
The core noise components of a dual spool turbofan engine were separated by the use of a coherence function. A source location technique based on adjusting the time delay between the combustor pressure sensor signal and the far-field microphone signa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::813d6b2e32c492e7725e1ed45f918f0f
https://doi.org/10.2514/1.38030
https://doi.org/10.2514/1.38030
Autor:
Jeffrey Hilton Miles
Publikováno v:
AIAA Journal. 46:61-74
The study of core noise from turbofan engines has become more important as noise from other sources such as the fan and jet were reduced. A multiple-microphone and acoustic-source modeling method to separate correlated and uncorrelated sources is dis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::deb66a67071a152a1ab080c5352557e5
https://doi.org/10.2514/1.25177
https://doi.org/10.2514/1.25177
Autor:
Jeffrey Hilton Miles
Publikováno v:
53rd AIAA Aerospace Sciences Meeting.
A cross-power spectrum phase based adaptive technique is discussed which iteratively determines the time delay between two digitized signals that are coherent. The adaptive delay algorithm belongs to a class of algorithms that identifies a minimum of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5ef918e5b70d9aff16e287b6c6d52c07
https://doi.org/10.2514/6.2015-0740
https://doi.org/10.2514/6.2015-0740
Autor:
Jeffrey Hilton Miles
Publikováno v:
The Journal of the Acoustical Society of America. 131(6)
An acoustic transfer function relating combustion noise and turbine exit noise in the presence of enclosed ambient core noise is investigated using a dynamic system model and an acoustic system model for the particular turbofan engine studied and for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::458040d0bc9cf44b61895a0a0ad2109b
https://pubmed.ncbi.nlm.nih.gov/22712936
https://pubmed.ncbi.nlm.nih.gov/22712936
Autor:
Jeffrey Hilton Miles
Publikováno v:
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition.
A previous investigation on the presence of direct and indirect combustion noise for a full-scale turbofan engine using a far-field microphone at 130 o is extended by also examining signals obtained at two additional downstream directions using far-f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::098d3053e01b58ae5fb95646ffb2f5fd
https://doi.org/10.2514/6.2010-19
https://doi.org/10.2514/6.2010-19
Publikováno v:
15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference).
Noise-source separation techniques for the extraction of the sub-dominant combustion noise from the total noise signatures obtained in static-engine tests are described. Three methods are applied to data from a static, full-scale engine test. Both 1/
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9b9b10f86eda1ee594f59188abeb80f7
https://doi.org/10.2514/6.2009-3220
https://doi.org/10.2514/6.2009-3220
Autor:
Jeffrey Hilton Miles
Publikováno v:
12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference).
The study of core noise from turbofan engines has become more important as noise from other sources like the fan and jet have been reduced. A multiple microphone and acoustic source modeling method to separate correlated and uncorrelated sources has
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe297bf69300c8f2e1f549a00c072194
https://doi.org/10.2514/6.2006-2580
https://doi.org/10.2514/6.2006-2580
