November 21, 2023 at 12:16 pmSANG JUN LEESubscriber
I'm designing helmholtz resonators (silencer) and using harmonic acoustics to check how much noise of which frequency is reduced by the resonator. but when i check the transmission loss, i see large peak only at certain frequencies. However, i know that in reality, a smooth graph is created over a wide range. I think the reason why such a prominent peak appears is because damping is not considered when the air vibrates. Can damping be used in acoustics analysis?
November 21, 2023 at 12:52 pmErik KostsonAnsys Employee
You can include the viscosity that adds some acoustic damping to the acoustic domain – this might be enough.
Often it might not be enough to capture the correct behaviour though. So the Helmholtz resonace frequency is captured by FEA acoustics, but the amount of transmission loss predicted is too small. This is because there might be some losses that can not be accounted for with FEA acoustics.
All the best
November 22, 2023 at 5:06 amSANG JUN LEESubscriber
Then, how can i put viscosity effect when i analyze in harmonic acoustics?
November 22, 2023 at 5:34 amErik KostsonAnsys Employee
Viscosity is a material property, and is thus defined in Engineering Data (ED).
If you use our defualt material such Air or Water Liquid from our ED general material libray it is allready defined.
All the best
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