Abstract
This paper is concerned with the problem of sound power determination in ducts of rectangular cross-section. Theoretical and experimental considerations lead to a rectangular measurement path at 0·6dy/2 and 0·6dz/2 distance from the duct axis where dy and dz are the cross-dimensions of the duct. This measurement path is largely independent of the duct aspect ratio dy/dz and the modal distribution of the sound field. Theoretical and experimental modal correction data applicable to this path are given taking into account the directivity characteristic of a microphone equipped with a turbulence screen. To obtain a stable spatial average, four to eight microphone positions are necessary. For measurements in reflective ducts, the sound pressure spectrum is to be averaged over a space diagonal in the rectangular duct with a minimum axial span of one-quarter wavelength at the lowest frequency of interest, and the modal correction for the above-described measurement path is to be applied.
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