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- W4243485192 abstract "As a result of the Bloch theory, the eigenstates of an electron in a strictly periodic potential are extended and the eigenenergy levels form allowed energy bands separated by forbidden gaps. In the study reported here, a finite air-filled tube with arbitrary mass density modulation is considered which allows the inclusion of the effect of disorder. Since this theoretical model is finite, it was possible to make direct comparisons with the experiment. The baffled tube is excited with the sound source emitted at one end. The source can deliver short pulses as well as harmonic oscillations. Both normal modes analysis (NMA) and pulse analysis (PA) were used. The spectra obtained from both methods are compared with the theoretical prediction. For the tube with evenly spaced baffles, three passing frequency bands were found. More interestingly, a few ‘‘surface’’ localized resonant modes whose frequencies lie in the gaps were discovered. The wave functions of the surface modes are confined within a few sections of divided tube at both ends. It was found that the acoustic intensity of higher frequency bands is drastically lower than that of the lowest band, which suggests that the baffled tube can be used as a frequency filter." @default.
- W4243485192 created "2022-05-12" @default.
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- W4243485192 date "1999-02-01" @default.
- W4243485192 modified "2023-09-25" @default.
- W4243485192 title "Sonic band structure and surface localized modes in a density‐modulated system: An experimental and theoretical study" @default.
- W4243485192 doi "https://doi.org/10.1121/1.425458" @default.
- W4243485192 hasPublicationYear "1999" @default.
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