The traditional optimization design of photonic crystal is based on a deterministic acoustic model. However,uncertainties widely exist in photonic crystal and seriously affect its acoustic properties. Here,an interval model was introduced to describe uncertainties of its system parameters. Then,Chebyshev polynomial was employed to construct the surrogate model of energy band structure of photonic crystal to analyze influences of uncertain parameters on photonic crystal’s bandgap. Finally,taking photonic crystal bandgap’s maximization as the objective function,taking bandgap variation range as the constrained condition,the interval photonic crystal reliability optimization model based on Chebyshev surrogate model was constructed. The genetic algorithm was used to solve this optimization model. Numerical results showed that Chebyshev surrogate model can effectively and accurately predict the bandgap variation range of photonic crystal based on the interval model; when interval uncertainties are considered,the optimization model of photonic crystal based on Chebyshev surrogate model can maximize the bandgap variation range to significantly improve the sound shielding performance of photonic crystal.
刘坚 陈俊煌 夏百战 满先锋. 区间模型下声子晶体的带隙优化研究[J]. 振动与冲击, 2018, 37(17): 115-121.
LIU Jian CHEN Junhuang XIA Baizhan MAN Xianfeng. Bandgap optimization of photonic crystal based on interval model. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(17): 115-121.
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