RADIATION OF A DIPOLE IN A WAVEGUIDE

Investigated the sound field of a point dipole with moment in two multimode waveguides – tube with a rectangular and tube with a circular cross-section, the wall of the both tubes are rigid. The field of the dipole obtained by the differentiation of a field monopole on the coordinates this source . It is shown that the approach of the dipole with moment to the rigid wall of the waveguide is lost radiation due to the component of the moment perpendicular to this wall. The calculated radiation power of a dipole in a multimode waveguide, investigated the dependence of this power on the frequency. It is shown that the radiation power of a dipole in a narrow (compared to the wavelength of sound) tube is equal to where is the wave number, and - consequently the density of filling medium and sound velocity in it, - the cross-sectional area of the pipe, - the projection of dipole moment on the axis of the tube.