33Hz Fundamental freqnency
33Hz Fundamental freqnency
(OP)
Hi all,
i need to perform a Dynamic anaysis using FEA, with Nastran.
i have question cause, I heard the next. If we will perform an analysis on a model with a fundamental frequency greater than 33 HZ, we can consider this structure as Hiperstatic, therefore, we can make an static analysis instead a dynamic analysis. For a FEA analyst is easier and faster perform a static analysis, if the assumption is true, we can make the analysis with knowledge that the results obtained are good.
But this assumption it's true? which is the theoretical explanation? this are considered in a code?
Thanks and Best Regards.
Rubén Orihuela
i need to perform a Dynamic anaysis using FEA, with Nastran.
i have question cause, I heard the next. If we will perform an analysis on a model with a fundamental frequency greater than 33 HZ, we can consider this structure as Hiperstatic, therefore, we can make an static analysis instead a dynamic analysis. For a FEA analyst is easier and faster perform a static analysis, if the assumption is true, we can make the analysis with knowledge that the results obtained are good.
But this assumption it's true? which is the theoretical explanation? this are considered in a code?
Thanks and Best Regards.
Rubén Orihuela






RE: 33Hz Fundamental freqnency
RE: 33Hz Fundamental freqnency
another day in paradise, or is paradise one day closer ?
RE: 33Hz Fundamental freqnency
I should point out that this reference really only applies for seismic analysis. If you have dynamic equipment or such, the rationale for how to include the effects of these rigid modes (or even the definition of rigid modes) would not necessarily be valid.
RE: 33Hz Fundamental freqnency
RE: 33Hz Fundamental freqnency
Faith is taking the first step even when you can't see the whole staircase. -MLK