Propagation of acoustic waves in a fluid-filled pipe with periodic elastic Helmholtz resonators Project supported by the National Natural Science Foundation of China (Grant Nos. 11372346, 51405502, and 51705529). |
Band structure and STL with M = 1. Solid and dotted lines correspond to the TMM and FEM results for elastic HR, and the dash dot lines correspond to rigid HR results calculated by TMM. |