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Acoustical Visualization of Aeroacoustic Noise Sources
Application of Multireference Near-field Acoustical Holography (NAH)
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To perform effective noise control, it is essential§that the detailed character of the noise source be§well understood. Near-field Acoustical Holography§(NAH) is a powerful tool for visualizing noise§sources and thus for identifying the detailed nature§of a source. NAH has been applied most often for§visualizing structure-borne and machinery noise§sources. In this book, it is shown how NAH can be§applied with equal success to aeroacoustic sources. A§detailed development of multireference NAH is§provided to allow the use of a scanning microphone§array. Also, methods for compensating for source§nonstationarity and for extrapolating sound fields§beyond the measurement aperture to improve the§accuracy of the source imaging are described.§Experimental results are given§for a ducted fan and for a free jet, and it is shown,§for example, that nearfield measurements allow the§accurate prediction of a source s farfield§directivity. The analysis presented in this book will§help scientists and engineers concerned with§visualizing aeroacoustic sources, in particular, and§more generally, any practical machinery noise§sources that comprise several§uncorrelated or partially correlated subsources.
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