Experimental Investigation of Natural Frequencies of Plates with Variable Thickness.
AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
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Experiments to determine the first four natural frequencies and mode shapes of vibrating plates of variable thickness were carried out. The specimens consisted of circular plates with circular cutouts of given radius with centers at various distances from the plate center, square plates with concentric circular cutouts with varying radii, a square plate with a double thickness, step and tapered plates with varying taper ratios. The experimental methods consisted of shaker testing with accelerometer sensing, and acoustic excitation with laser holographic interferometry. The variation of frequency, and mode shape with cutout location was investigated in both experiments.