A locally resonant sonic crystal made of acoustically coupled concentric C-shaped cavities is proposed that generates multiple band gaps for usage as ventilated noise barrier. There is lack of comprehensive theoretical model for acoustic response of such concentric resonators, because the inter-scatterer coupling and variations in scatterers’ opening and orientation angles introduce complex nonlinear effects. A semi-empirical theoretical model is proposed and validated for central frequency and bandwidth of the first band gap (BG) of proposed structure. Large-scale numerical analysis evaluates the impact of these angles, and a Kriging-assisted multi-objective genetic algorithm is developed to tune these angles for achieving a target BG with broadened bandwidth. Smaller opening angle and orientation misalignment lowers the central frequency and vice versa, whereas bandwidth varies nonlinearly. Experiments show multiple tunable transmission loss peaks above 20 dB within 1500 Hz, demonstrating a dimension invariant approach for tuning the sound attenuation of this sonic crystal.
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