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acoustics in Ansys Mechanical ACT

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Old   October 30, 2015, 08:38
Default acoustics in Ansys Mechanical ACT
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Hi everyone,

I am not sure if I am posting this in the right place...

I have started playing with Ansys Mechanical and the plugin of Acoustics ACT.

I am not an expert in acoustics, so maybe I am understanding something wrong...

I have completed the transmission loss tutorial and later I have added a pair of panels to the door. When I postprocess results, I focused on transmission loss factor.

The weird thing is that when I make two (or more) different executions of the same case (same geometry, same mesh, same settings...just run again the case after "Clear generated data"), the transmission loss changes dramatically (sometimes more than 7 dB), so, how can I obtain reliable results with this random behaviour of the coefficient?

I have read something about the theoretical behind Ansys Acoustics, but I am not sure if I have understood it well. As the wave propagates in all directions from a sphere, then the result plot will be random but, is it admissible such a big difference? I can expect small differences among executions, but, how can I get a coefficient I can trust in?

I apologise in advance, maybe this is a stupid question, but I am a beginner in theoretical and computational acoustics...

Any kind of help will be much aprecciated


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