Figure 3
From: A low-frequency multiple-band sound insulator without blocking ventilation along a pipe
Performance of multiple MFCBs. (a) A string of MFCBs established in a pipe. (b) The dispersion of a periodic structure consisting of a string of MFCBs. The lattice constant is \(d = 15\;{\text{cm}}\) and the equivalent Young's modii of the MFCBs are identical, which are \(E = 4.9 \times 10^{10} \;{\text{Pa}}\). (c) Simulated transmission losses induced by a string of five MFCBs with identical parameters. (d) Simulated transmission losses induced by three MFCBs with different Young's moduli. (e) Comparing between simulated and measured transmission losses induced by three MFCBs with different Young's modii of \(E_{1} = 6.1 \times 10^{10} \;{\text{Pa}}\), \(E_{2} = 7.1 \times 10^{10} \;{\text{Pa}}\) and \(E_{3} = 8.9 \times 10^{10} \;{\text{Pa}}\) (the figure is created using MATLAB 2016 and COMSOL 5.5).
