This study proposes an effective strategy to enlarge the band gaps of holey phononic crystal strips. The approach involves identifying each band and its key influencing factors, then implementing targeted synthetic adjustments like geometry optimization and embedment to reposition the relevant bands, and finally achieving larger band gaps. The main band gap can be enlarged from 47% to 64% with slight modifications. Furthermore, this optimal result is only achieved through the synergistic action of different methods, each of which has small or even counteractive individual effects. The design strategy starts from large-scale to small-scale adjustments, culminating in specific case-by-case adjustments. It presents new possibilities for enhancing phononic crystals.
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