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bassnerd

Acuostic Cavity Modes: Closed and Open Cylinder

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Hello,

I am new to Hypermesh. I want to perform two things, simulate the acoustic cavity modes of

(1) hollow cylinder closed at both ends

(2) hollow cylinder open at one end and closed at other end.

 

I am able to do (1) by meshing the hollow closed cylinder and creating an acoustic cavity mesh inside it through "mesh --> create", and then deleting the structure around the cavity and use EIGRL to find the modes of the purely acoustical solid structure that remains. In this method, I end up with only one element type, and one component, which is the cavity mesh. I am solving this in Optistruct.

 

I need help with performing (2). How do I simulate the open air boundary condition at the cylinder's open end? Is there a way I can define the impedance of the 'open' elements.

 

Any help will be greatly appreciated. I am new to Hypermesh so I request you to explain a bit elaborately. Thank you so much!

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