A New Approach for Calculating Wideband Fields

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ConclusionsThe Directivity Spectrum approach presented here provides a convenient and efficient method to simulate transient acoustic fields propagating in homogenous media. Simulation output directly provides spatial ‘snapshots’ of the acoustic field at particular time instants. Attenuation and velocity dispersion are easily incorporated. Propagation both forwards and backwards to any location is easily accomplished without accumulation of numerical errors with propagation distance. The boundary conditions for the approach may be provided by other methods (such as finite element models). The technique then provides a tool for rapidly calculating subsequent propagation in ‘real’ homogenous media, free from accumulation of numerical errors. Only results of simple geometries have been presented here to enable direct comparison with well known theoretical results, although the approach is applicable to arbitrary geometries.

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