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Radiation of a point source into a semi-infinite space
Posted 2018年5月15日 GMT-0400上午8:39 Acoustics & Vibrations Version 5.3a 2 Replies
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I'm trying to make a simple model of an acoustic point source radiating into a semi-infinite space.
I have built the model by defining a monopole point source in the origin of a sphere. The sphere is surrounded by a PML. After this, I removed half of the geometry using the 'difference' boolean, to create a hemisphere. The source is now located in the center pf the flat side of the hemisphere, which is a hard surface.
When I calculate the SPL on the boundary of the (hemi)sphere for both versions of the model, I find that the SPL for the hemisphere is 6 dB higher than that of the sphere. However, I only expected a 3 dB difference, since halving the volume would double the squared pressure.
Did I make a mistake in my model, or did I get my theory wrong?
Thanks in advance,