There has been an explosion of interest in acoustic metamaterial in the last ten years. The tunable negative acoustic metamaterial\nis an important issue for designing metamaterials. The acoustic metamaterial is restricted by the narrow bandgap of sound waves\nfor the local resonance of metamaterial unit cells. By shifting the sizes of the unit cell, the acoustic metamaterial could potentially\novercome the limit of the narrow resonance frequency. In this research, we focus on the resonant behavior of split hollow sphere\n(SHS) in the waveguide. Firstly, we analyze the resonance characteristics of SHS and get an analytical formula for the effect of\ngeometrical parameters on the resonance frequency. Furthermore, the resonance frequency of SHS is verified with finite-element\nmethod analysis based on COMSOLMultiphysics simulation. The results are in good agreement with theory model. It is observed\nthat there is a blue shift of the resonance frequency with the gradual increase of the neck radius of SHS, a V-type response curve\nwith the increase of inner radius of SHS, and a red shift with the increase of outer radius of SHS. Using the method of estimate\nof resonance, we could get a precisely controllable unit structure with negative effective modulus and offer a way to optimize the\nrealization of double negative acoustic metamaterial.
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