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

Table 5

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

Crank angle	Modes	Present results	ANSYS results	Relative errors
= 90°	1	5.15051	5.14912	0.03%
	2	5.27945	5.27765	0.03%
	3	9.42541	9.40889	0.18%
	4	12.4088	12.37671	0.26%
	5	14.3156	14.25922	0.40%
= 150°	1	5.15063	5.14912	0.03%
	2	5.27544	5.27331	0.04%
	3	9.41916	9.40088	0.19%
	4	12.3053	12.27255	0.27%
	5	14.162	14.10833	0.38%