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i  have these doubts please explain anyone

1) To converting rigid bodies into flexible bodies in hypermesh opti, Why we are going for modal analysis?

2) is there any method other than Modal analysis??

 please help me with this 

thank you

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rigid bodies => super stiff

FE bodies => super complex (too much dofs, to much solving time)


=> simplify the bodies, using some dofs (eigen modes) to reduce stiffness => flexible bodies

general deformation is combination of eigen modes, normally less than FE dofs

because that, only global deformation is considered.

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