Tunable coupled-resonator acoustic waveguides based on defect resonance body

To realize the research on the establishment method of the coupled-resonator acoustic waveguides (CRAWs) and the adjustable method of the transmission frequency, a new model of the acoustic waveguide of the resonance body is proposed, and the continuous adjustment of the transmission frequency is realized. Defects are created by rotating the scatterer and changing Young's modulus of the shape-memory alloy (SMA), and the coupling between the defect resonance bodies forms a waveguide path. We calculated the dispersion relationship and transmission characteristics of the model studied the physical mechanism behind the method of establishing the coupled resonance body and the formation principle of guided modes, and analyzed the control range of the transmission frequency. The results show that the relationship of the coupling effect is strongly related to the distance between the defect resonance bodies. Compared with the linear defect waveguide, CRAWs have the advantages of low energy transmission loss and no interference of guided modes. The research on the method of establishing the waveguide of the coupled resonance body is realized, and the improvement of energy transmission, the improvement of the guided mode, and the flexible and arbitrary construction of the waveguide path can be realized.