Learning Forum

[SANG JUN LEE]

Hi, I'm designing helmholtz resonator as silencer and i want to ananlyze my model how much this model can reduce noise. i use Harmonic-acoustics, but transmission loss and absorption coefficent have shown opposite results. as you can see, at the frequency(Hz) where transmission loss is low, the absorption coeffiecient is high. i want to know which of transmission loss and absorption coefficient shows the amount of noise reduction properly.

[Erik Kostson]

Hi

transmission loss is common FE result for silencers.

See here for some general theory and definitions on acoustic results:

https://www.youtube.com/watch?app=desktop&v=K8wdvxFnHXE

Acoustic Power Loss Results (ansys.com)

If you are not able to open the links, refer to this forum discussion: How to access the ANSYS Online Help

Guidelines for Posting on Ansys Learning Forum

Hope that helps