Vibration and Damping Analysis of a Multilayered Composite Plate with a Viscoelastic Midlayer

Table 1

Dynamical results of three- and five-layered constrained damping plate.

,		⁢Results
		Three layers of [21]		Five layers by proposed method		⁢Five layers by FEM
		(Hz)		(Hz)		(Hz)
		60.2	0.190	61.6	0.188	57.4	0.190
		130.4	0.199	130.2	0.243	126.9	0.247
		115.2	0.203	115.9	0.239	112.0	0.241
		178.5	0.181	173.9	0.243	170.4	0.238
		195.4	0.174	189.0	0.240	186.5	0.232
		255.0	0.151	240.6	0.226	238.5	0.222
		456.5	0.102	407.7	0.176	409.9	0.171
		435.3	0.105	390.4	0.181	391.1	0.180

in this table stands for the vibration order in direction.