Engineering | Finite Element Analysis | Stress
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Boundary Conditions
Theoretically, no boundary conditions are required. However, I do advise to apply
at least one to a model, as it will help the solver overcome any potential problems
due to rigid body motion (otherwise known as ill-conditioning). Just fix any point
on the model with a zero displacement, and the model will always solve.
If you intend
applying boundary conditions, note that the results of eigenvalue analyses are very
sensitive to the way in which BC's are applied. Therefore, always try to replicate
the physical boundary conditions as closely as possible. If you cannot achieve this
for some reason, carry out a sensitivity analysis by modifying the BCs slightly &
comparing the results with your previous output. This will give you an indication
of the influence the BCs have on the results.
Vibration - boundary conditions
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