Measurement of Structural and Acoustic Intensities Using Near-Field Acoustical Holography

概要

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A non contacting method for measuring structural and acoustic intensities is proposed by developing the signal processing in near-field acoustical holography (NAH). The effectiveness of this method is illustrated by applying it to the measurement of radiation from ribbed and unribbed submerged plates. The spatial derivatives for determining the structural intensity are evaluated by a K-space filtration method newly developed by the authors. The experimental data obtained at 928 Hz and 1464 Hz are selected for specific and detailed investigation. The attached ribs have a small influence on the structural intensity flow at 928 Hz, so the vibrational mode of the ribbed plate is the same as that of the unribbed plate. However, since the attached ribs control the direction of vibrational energy flow at 1464 Hz, the vibrational mode of the unribbed plate is markedly changed.
社団法人応用物理学会の論文
1996-05-30