Historically, based on the original theory, Nearfield Acoustic Holography (NAH) was performed on a plane, but due to the 3D nature of many noise sources, planar results are not adequate. Also, traditional NAH assumes that all acoustic sources (and sinks) are in front of the array, so in a vehicle or cabin, a reflection from behind the array is mapped as a sink in front of the array. This course will present techniques for mapping complicated 3D sources including “interior” environments such as vehicles or cabins, as well as other applications of these arrays such as in-situ absorption coefficient, panel contribution and intensity component analysis. Students attending this course will have a basic understanding of theory of traditional NAH as well as a number of new algorithms and the benefits gained and the potential uses to solve noise source identification issues.
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