Learning Forum

[hhusker]

I find it hard to find tutorials on ansys acoustic systems. I need to run modal analysis and harmonic analysis to get frequency response(pressure) on a body with FSI that is excited sinusoidally. I keep running into issues when acoustic body(air) is introduced in modal(Acoustic modal) as sans that(modal) it seems to work but runs to a dead end when connected to harmonic. Or is it fine if I neglect the air contained in the structure?Any help would be greatly appreciated. I have attached the structure i have and its internal geometry.

I am using Ansys 19.1 student version and have the acoustic extension

[Hui Liu]

there should be some workshop examples come along with the ACT doc. looks like you are trying to set up a Mode-superposition harmonic. Have you tried a full harmonic?

[hhusker]

I cant change the option to full after i link the modal to harmonic. I think I am making some fundamental error somewhere. Should I ignore the acoustic body inside? and I was talking about the modal acoustics,harmonic acoustics systems in Ansys 19.I could only find one pdf with the ACT,are there abything?

 

[Hui Liu]

you can make a duplicate of the harmonic and when popped up question asking if you want to maintain the link, say NO. then you have a independent harmonic and you can set it to full harmonic. Not sure what your overall simulation goal, also your structure material type etc, so I don't know if you can ignore. you can try running both with and without and see how much difference you get. there should be a whole bunch of lectures and workshops in the ACT folder. try download a different version see if you can find it.

[hhusker]

I finally go the modal acoustics to work but now I cant connect it to the harmonic acoustic for some reason. My overall simulation is to run modal analysis then get  frequency response(pressure) for sinusoidal excitation(sound pressure/mass source etc) for which i needed harmonic acoustics.