An Investigation of the Effects of Square Cutouts on the Natural Frequencies and Mode Shapes of Rectangular Plates.

摘要

The effects of square cutouts on the natural frequencies and mode shapes of 7-inch by 10-inch rectangular plates were investigated experimentally by holographic interferometry and theoretically by finite element technique. It was found that the frequencies of the first mode decreased slightly and then increased as the size of central cutouts increased. The frequencies of the first five modes of plates with 1-inch square cutouts remained constant at various cutout locations. Plates with larger cutouts exhibited larger displacement gradients around the cutouts which may be a measure of the stress concentration around the cutouts. (Author)