Error signal sensing for active noise control in turbofan engine nacelles

Autor:	Alan S. Hersh, Bruce N. Walker, Edward J. Rice
Rok vydání:	2002
Předmět:	Signal processing Acoustics and Ultrasonics Microphone Computer science Acoustics Sound power Turbofan Noise Arts and Humanities (miscellaneous) Interference (communication) Noise-canceling microphone Harmonic Wavenumber Active noise control
Zdroj:	The Journal of the Acoustical Society of America. 111:2452
ISSN:	0001-4966
DOI:	10.1121/1.4778450
Popis:	Blade passage harmonic tones are a significant component of turbofan engine noise under approach conditions. Active noise control (ANC) offers a tool for suppression of these tones, with the caveat that interference patterns in the sound field can lead to poor or even negative correlation between in‐duct sound pressures and radiated sound power. Various modal decomposition and wavenumber separation schemes have been investigated in attempt to overcome this obstacle. The paper will discuss methods that have been applied to design and implementation of microphone arrays and signal processing techniques to provide unambiguous error signals for ANC systems in these complex acoustical environments and will present results of computer simulations and field tests. [Work sponsored by NASA Glenn and NASA Langley Research Centers.]
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ee7550f80cc93f3d48f56e5d25ada860 https://doi.org/10.1121/1.4778450 Zobrazit plný text záznamu