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Any known limitation on amount of flexible bodies in a model with multiple fixed connections in between?

javier.gutierrez
Hello,
 
I would like to know if anyone has already encountered limitations as the complexity of the flexible bodies increase as well as the number of fixed/bushing connections between them.
While working in a non conventional project, we are trying to do a load cascading with multiple complex flexible bodies with more than 10 connection points between some of them. There is not any rigid part in between them.
 
Is there any general known limitation or rule in order not to fail into wrong loads?
 
We have experience with these activities before with successfull results, but we are wondering in the increase of connection points could be an issue for the load cascading.
 
Thanks,
 
Javier
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  • 0
    Javier,
     
    1. Have you performed a proper sensitivity analysis on the Solver settings for equilibrium?
     
    2. The number of modes in the flexible body does not depend on the number of nodes.
     
    3. The number of nodes can affect the geometry rendering that can add to simulation time. For this, you need to perform a couple of tasks:
     
    • You need to perform a Mesh Refinement Study on the FEA side and see if you can use coarser mesh but still maintain the frequencies of interest.
     
    • You can make use of the method explain in the article below that shows how you can reduce the amount of mesh, which could help reduce run times, especially for DOE's where the mesh visual representation is not of high importance: simcompanion.mscsoftware.com/.../index
     
    Thanks,
    Maziar Rostamian
    MSC Technical Support
     
     
Reply
  • 0
    Javier,
     
    1. Have you performed a proper sensitivity analysis on the Solver settings for equilibrium?
     
    2. The number of modes in the flexible body does not depend on the number of nodes.
     
    3. The number of nodes can affect the geometry rendering that can add to simulation time. For this, you need to perform a couple of tasks:
     
    • You need to perform a Mesh Refinement Study on the FEA side and see if you can use coarser mesh but still maintain the frequencies of interest.
     
    • You can make use of the method explain in the article below that shows how you can reduce the amount of mesh, which could help reduce run times, especially for DOE's where the mesh visual representation is not of high importance: simcompanion.mscsoftware.com/.../index
     
    Thanks,
    Maziar Rostamian
    MSC Technical Support
     
     
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