How to obtain the Diffuse Transmission Loss of a structure?

- December 12, 2020 at 4:56 pm
  
  bcho
  Subscriber
  
  Hi everyone,nI am trying to simulate the diffuse transmission loss of a structure by means of Mechanical APDL. So far I've only been able to do so by applying PML underneath my structure and a acoustic diffuse field excitation by DFSWAVE on top of the structure. With this I could calculate the TL with the commandnpras,dfst,avg,all ! print average transmission lossnThis however only yields correct results if I apply the PML.nIs there another way to calculate the diffuse TL without PML for example with the rayleigh integral (command PRFAR) or something similar?nThanks a lot.n
- December 14, 2020 at 5:57 am
  
  Ashish Khemka
  Forum Moderator
  
  Hi Array ,nnPlease see if the following links help:n ,nnPlease see if the following links help:nnArraynRegards,nAshish Khemkann
- December 14, 2020 at 1:26 pm
  
  bcho
  Subscriber
  
  Hi Ashish Khemka,nThank you very much for your response! nThe link you posted above partially helped since starting from there I found some further information.nHowever, I have another question. I noticed that there were higher oscillations of the transmission loss at the lower end of the frequency range, that I observe (see the attached picture). Until now I have not recognized a pattern up to which frequency those oscillations occur. Do you maybe have an idea?nThank you and best regards.nn

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