SCATTERING OF ACOUSTIC-WAVES ON A PARTITION SEPARATING WAVE-GUIDES WITH DIFFERENT PERFECT WALLS

The stationary scattering of acoustic waves on a partition separating plane semi-infinite waveguides is studied. The walls of one waveguide are absolutely rigid, while those of the other are absolutely soft. As a partition, either a piston elastically coupled to the waveguide wal ls or a flexibly oscillating plate is considered. In the first case, t he exact analytical solution is obtained. In the second case, an infin ite set of linear algebraic equations of the second kind with a comple tely continuous operator, which admits a numerical solution using a tr uncation technique, is derived. The results of a numerical analysis of the reflection coefficient related to the energy of normal waves as a function of the incident wave frequency are presented.