Vibration Analysis and Optimization of a Rectangular Plate with Flanging Hyperellipse Cutout

Table 5

Influence of cutout rotation on the first two frequencies of clamped-free plate.

(°)	Natural frequency (Hz)
	f1	f2
0	8.8815	27.399
15	8.876	27.609
30	8.7464	27.507
45	8.5695	27.466
60	8.3915	27.560
75	8.2598	27.738
90	8.2109	27.831