Simultaneous Shape and Stacking Sequence Optimization of Laminated Composite Free-Form Shells Using Multi-Island Genetic Algorithm

Table 4

Objective values of initial and final generations in first phase optimization for Shell 1 (Hz).

Initial lay-up (°)	Initial generation		Final generation		Relative increase (%)
	Average	Best	Average	Best	Average	Best
[45/−452/45]2s	28.43	104.11	107.53	132.12	278.23	26.90
[0/902/0]2s	28.13	112.10	114.68	151.50	307.68	35.15
[0]8s	20.95	56.69	80.61	109.17	284.77	92.57