Abstract:

The modal impulse response method and the wave vector--time domain method are two of the existing methods to evaluate the transient acoustic field from an axisymmetric planar radiator. Representations of the transient acoustic field in the space-time domain and the wave vector--time domain are linked through the Fourier/Hankel transform relationships, and the wave vector--time domain method is used to derive the modal impulse response for a space-time separable normal velocity distribution of an axisymmetric source. The classical uniformly shaded piston is first addressed as a benchmark case, and a Bessel shaded aperture is then addressed as a result of its importance in addressing more general source distributions. Numerical results are presented for both cases to illustrate the procedures in using the modal impulse response and the wave vector--time domain methods. [Work supported by URI/Ocean Technology Center.]