The specific acoustic impedance of an aperture on the cylindrical surface

In this paper,the acoustic impedance caused by the sound radiation at the terminals of the aperture,which is laid on the cylindrical surface,is analysed on the base of rigorous sound theory.In low frequency range,the approximate solution of the specific acoustic resistance is derived.Special operations are introduced in order to simplify the solution of the specific acoustic reactance.It is verified that the specific acoustic reactance of the aperture on the cyclindrical surface is equal to that of a similar aperture on an infinite large plane if small quantities of high order are omitted.