Optimization design of acoustic superstructure bandgap for target frequency
This article investigates the bandgap characteristics of cantilever beam type local resonance phononic crys-tals and proposes a universal bandgap optimization design method.Firstly,the band gap structure and formation mechanism of phononic crystals were analyzed,and it was found that the proportion of modal effective mass is a key factor in whether the band gap can be opened.Secondly,based on the response surface method,the optimization design of the band gap of phononic crystals is studied.Key design variables are selected through parameter correlation analysis,and experimental points are obtained through the optimal space filling design.A response surface model is constructed for multi-objective op-timization to obtain a band gap optimization design scheme that can match a specific target frequency.Finally,validate the proposed optimization plan.The results show that both bandgaps of the optimized local resonance unit are open at the target frequency.This research achievement provides a method and idea for optimizing the bandgap design of local resonant phononic crystals.
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