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Found 4 results

  1. I am performing a modal analysis of my sheet metal structure and I have used rbe3 and rbe2 elements to connect two sheet metal part mesh. But, it showing error as saying "massless body found". I want to ask that in modal analysis rigid body work or not?
  2. Hello, I am running modal analysis on a helicopter model that has both 2D and 3D elements. I created rigid links and applied mass at the middle node (to represent the lithium ion batteries) however I am not sure which card image to assign for the rigis links and the mass. I tried PMASS and got an error. When I take out the rigids and the masses, I can run the analysis without problem. Thank you in advance, Muge
  3. can anyone explain Mode Super position method briefly ?
  4. 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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