Topology Optimization of Free Damping Treatments on Plates Using Level Set Method

Table 1

Modal frequency and damping ratio of test plates.

	1st modal		6th modal
	Frequency (Hz)	Damping (%)	Frequency (Hz)	Damping (%)
Bared	71.75	0.17	325.31	0.68
Shape (a)	86.87	3.81	364.23	1.28
Shape (b)	77.45	2.90	359.36	1.5
Shape (c)	83.47	3.77	362.83	1.39
Shape (d)	87.02	3.84	372.79	1.58