Free Vibration Analysis of Symmetrically Laminated Folded Plate Structures Using an Element-Free Galerkin Method

Table 3

Dimensionless free vibration frequencies of the cantilevered onefold laminated plate with the lamination scheme (0°/90°/90°/0°).

Crank angle	Modes	Present results	ANSYS results	Relative errors
= 90°	1	4.97836	4.97752	0.02%
	2	5.47994	5.47883	0.02%
	3	10.9922	10.97741	0.13%
	4	14.3614	14.32497	0.25%
	5	29.6419	29.62531	0.06%
= 150°	1	4.97887	4.97752	0.03%
	2	5.47507	5.47410	0.02%
	3	11.0002	10.98326	0.15%
	4	14.0093	13.97611	0.24%
	5	29.6493	29.63643	0.04%