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The integral-equation method is applied to determine the
diffracted acousticfield about circular and ring apertures in
soft and hard baffles. To verifythe accuracy of the
numerical algorithm , the diffraction of acoustic wavesabout
soft and hard circular disks have been computed and compared
withanalytical results . The same numerical method is then
applied to computethe diffracted acoustic waves about
circular and ring apertures in soft andhard baffles . The
Babinet principle has also been used to check whether
thecomputed diffracted acoustic wave about a soft (hard) disk
is identical toabout a circular aperture in a hard (soft)
baffle. Finally , the effectof different parameters on the
diffraction is systematically studied andcompared. These
parameters include the location of acoustic source,
thewavenumber , as well as the size of the aperture relative to
the wave length.A general discussion based on a comparison of
diffracted acoustic fields abouthard and soft baffles is given.
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