Acoustic radiation energy focus in a shell with liquid

Abstract

When the geometric dimensions of the cylindrical housing are much greater than the sound wavelength, the excitation zones. There is thus a focusing of penetrating acoustic radiation energy, which takes the form of a caustic surface. This results in a sharp concentration of the sound wave energy inside a liquid static part of the suspension, accompanied by a significant increase in the sound pressure level. Upon housing irradiation with a wide enough sound beam, which, by the way, is observed under operating conditions in the form of a reverberant space, the coincidence resonance may occur for both transverse and circumferential waves. Furthermore, the liquid static parts may also have the radial bands of sound radiation energy concentration as a result of interference phenomena.