How can i know amount of noise reduction?

- November 27, 2023 at 3:26 am
  
  SANG JUN LEE
  Subscriber
  
  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.
- November 27, 2023 at 6:15 am
  
  Erik Kostson
  Ansys Employee
  
  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