Tuesday 8 May 2012

What is Free Free run

 
Very important meshing check for assembly of components.


Natural frequency calculations without applying any restraints /constraints.
 
Any single object allowed to vibrate freely, should show first 6 modes as rigid (natural frequencies = 0) and 7th onward show deformable modes with positive value of natural frequency.

Suppose there are 100 parts in the assembly, 99 are connected to each other and 1 left out due to mistake. Free-Free run of the assembly will show 6 rigid modes and by observing mode shapes one can easily detect which component is un-connected.


3 comments:

  1. These are great blogs. I've read the the user manual, theory manual, examples, etc. and this is a concise, easy to understand summary of complex material. Please continue to put out more. Found it extremely helpful
    Tim

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