Abstract
Considering the fluid nonlinearity, a calculation model based on quasi-linear solution of Westervelt’s equation is proposed in this paper. A more accurate approximation of Rayleigh integral is derived and velocity distribution in parametric loudspeaker surface is fitting by a set of Gaussian functions. Gaussian beam expansion is used to simply five-fold integral in calculation difference-frequency wavefield. Spatial sound pressure distribution of an annular array composed of serval rigid disks are presented. It can be found that uniform distribution of difference-frequency wave in <i>xoy</i>-plane is realized by annular array.
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