Maximization of fundamental frequency of layered composites using differential evolution optimization

Differential evolution optimization is used to find staking sequences for maximization of the natural frequency of symmetric and asymmetric laminates. Clamped and simply supported boundary condition are considered. A meshless numerical method is used to compute free vibrations of square and rectangular plates. Obtained staking sequences for symmetric laminates are in accordance with the literature. Optimized staking sequences for 8 ply asymmetric laminates are also presented. Asymmetric staking sequences produced higher first natural frequencies. Posterior analysis shows that optimized asymmetric staking sequences are hygrothermally stable.