Free Vibration of Rectangular Plates with Porosity Distributions under Complex Boundary Constraints

Table 1

Spring stiffness values correspond to different boundary conditions.

BC	ku,x					k u,y
FE	0	0	0	0	0	0	0	0	0	0
SSE	0	10^15	10^15	0	10^15	10^15	0	10^15	0	10^15
CE	10^15	10^15	10^15	10^15	10^15	10^15	10^15	10^15	10^15	10^15
E^1E	10^10	10^15	10^15	10^15	10^15	10^10	10^15	10^15	10^15	10^15
E^2E	10^10	10^10	10^15	10^15	10^15	10^10	10^10	10^15	10^15	10^15
E^3E	10^10	10^10	10^10	10^15	10^15	10^10	10^10	10^10	10^15	10^15
E^4E	10^10	10^10	10^10	10^10	10^15	10^10	10^10	10^10	10^10	10^15
E^5E	10^10	10^10	10^10	10^10	10^10	10^10	10^10	10^10	10^10	10^10