The prediction of ringing noise of a drop hammer in a rectangular enclosure
Y. W. Lam, David C. Hodgson · The Journal of the Acoustical Society of America · 1993
The result of the prediction of the ringing noise of a 1/3 scale model of a drop hammer in a rectangular room is presented. The noise prediction uses a numerical technique developed in an earlier work [Y. W. Lam and D. C. Hodgson, J. Acoust. Soc. Am. 88, 1993–2000 (1990)]. The technique is based on the Helmholtz integral equation with a modified Green’s function to account for the effect of the enclosure. The vibration data required by the noise prediction technique was obtained by finite element predictions and impact response experiments. It was found that the noise prediction shows good agreement with measurements in general, but at certain frequencies noise other than the ringing noise was found to contribute significantly towards the measured noise levels.