Detection of noise sources by highly accurate acoustical holography.
نویسندگان
چکیده
منابع مشابه
Preliminary Investigation of Multilobe Fighter Jet Noise Sources Using Acoustical Holography
An understanding of jet noise source mechanisms can facilitate targeted noise reduction efforts. This understanding has been enhanced with acoustic imaging technologies, such as near-field acoustical holography (NAH). In this study, multisource statistically optimized NAH (M-SONAH) was used to image the sound field near a tethered F-35 aircraft at multiple frequencies. A linear microphone array...
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Full-scale tactical aircraft noise exhibits multiple radiation lobes not seen in laboratoryscale jets. These lobes have different radiation directions yet appear to have similar, overlapping source regions. Near-field acoustical holography (NAH) source reconstructions, in conjunction with partial field decomposition (PFD) methods that produce physically meaningful partial fields, are used in th...
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During a study of reciprocating refrigerator compressor noise, it was desired to develop a new technique for visualizing of the vibrations of the shell surface. Previous investigators have shown the value of acoustical holography for this purpose in other applications. However, the spherical geometry of the compressor of interest required the use holography in spherical coordinates. The present...
متن کاملCylindrical acoustical holography applied to full-scale jet noise.
Near-field acoustical holography methods are used to predict sound radiation from an engine installed on a high-performance military fighter aircraft. Cylindrical holography techniques are an efficient approach to measure the large and complex sound fields produced by full-scale jets. It is shown that a ground-based, one-dimensional array of microphones can be used in conjunction with a cylindr...
متن کاملFast wideband acoustical holography.
Patch near-field acoustical holography methods like statistically optimized near-field acoustical holography and equivalent source method are limited to relatively low frequencies, where the average array-element spacing is less than half of the acoustic wavelength, while beamforming provides useful resolution only at medium-to-high frequencies. With adequate array design, both methods can be u...
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ژورنال
عنوان ژورنال: JSME international journal
سال: 1987
ISSN: 0913-185X
DOI: 10.1299/jsme1987.30.822