N.S.Gorodetskaya The incident wave energy transformation on the boundary in a composite waveguide |
Acoustic bulletin, Vol. 4 ¹ 1, (2001) |
| On the basis of a method of a superposition the calculation of a transformation energy of the first normal wave is carried out for the waveguide formed by a strong contact of the two halfstrips of identical width, but different elastic properties. The phenomenon of a sharp increasing boundary clarity and the phenomenon of a sharp increasing reflected properties of the boundary (energy trapping) in more high-frequence area are observed in a range of frequencies where there are one reflected propagating wave and one transmitted propagating wave. Both those phenomena can be qualitatively analysed if the falling wave is presented as the superposition of P- and SV-waves. Then the features of the reflected and transmitted waves on the boundary of the two half-spaces can be analysed. The phenomenon of a sharp increasing boundary clarity is caused by the feature of the energy transmitted to the second half-space by SV-wave. The energy trapping is caused by reorganization of wave field in the vicinity of frequencies on which the propagating P-wave occurs on the boundary. Frequency where the energy trapping is found can be displaced in a lower area if the dispersion properties of the propagating waves are changed. |
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KEY WORDS: composite waveguide, normal modes, energy trapping, the superposition method |
| TEXT LANGUAGE: Russian |