Handbook for the Calculation of Sound Propagation Phenomena
NAVAL RESEARCH LAB WASHINGTON DC
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The complete calculation and representation of sound fields involves considerable difficulties even in the cases of simple radiator arrangements. In the following treatment, an attempt is made to develop the basic formulae and concepts and to apply them practically in a series of simple examples. Due to the extraordinary simplification, it appears justifiable at first to confine the calculation to a region at a great distance from the radiator. With this limitation, the transition from the non-directional to the directional radiator is made very simply when the formulae for the non-directional sound emitter are modified by an additional factor designated as the directional characteristic or the radiation factor. Also, with this simplification, the calculation of the sound field of membranes which, in contrast to the piston membrane, do not need to have constant vibration amplitudes and may possess nodal lines then encounters no particular difficulties.