Acoustic FEA Analysis

[mathlete7]

Hi,

I'm looking for a good tutorial on performing low frequency acoustic response analysis via Nastran (structural vibroacoustic response of panels to acoustic loading, etc). Does anyone know of any good tutorials or textbooks that go over this topic? I'm looking for something that will have some theory (at a high level) and practical implementation via FEA.

Thanks much,
Dan

 

[MikeyP]

Are you talking about actual fluid loading by a non-random pressure field, or just exciation by random "rain on the roof" forcing?

M

--
Dr Michael F Platten

 

[mathlete7]

Just a random "rain on the roof" forcing...
Any suggestions (tutorials, textbooks, webpages, etc)?

Thanks...

 

[spshone]

For a random loading on the theory side - get yourself on the NASA reports server and search for 'Joint Acceptence' --- I'm assuming as an aerospace chappy, you are interested in acoustic coupling to cylinders.

BUT, as I am an aerospace chappy (and acoustic engineer) I'll tell you it is not a purely random excitation - even from turbofans.

I recommnend you dig out a book by E.J. Richards and Denys Mead called Noise and Acoustic Fatigue --- otherwise known as the bible (to us acoustic engineers, at least).

For coupled fluid structure interaction, Nastran uses a body-in-white appraoch and doesn't do anything sepctacularly clever to write the coupling matrix between structure and fluid.

For Nastran:
1) all fluid dofs with -1
2) fluid and structure must have UNEQUIVENECED nodes
3) if you don't have bodyinwhite licence, you need a mapped mesh. i.e. same mesh on acoustics as on structure

 

[GregLocock]

What makes you think that there is anything more to it than a normal solid model?



Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[khanh6585]

Hi, I am newbie in ANSYS and now I have to learn how to analyze noise/acoustic in step motor. But at this moment I dont know where can I begin. I need some ANSYS tutorial, please help me!