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Eigenfrequency with associated effective mass fraction

Experimenter
Experimenter

Hi

 

Is there a way to run a modal analysis computing just eigenfrequencies with an associated mass fraction over a certain %? The aim is to safe computational time.

 

Thanks,

 

Paco

 

 

2 REPLIES

Re: Eigenfrequency with associated effective mass fraction

Genius
Genius

You would have to compute the mode before throwing it out anyways, so there is no benefit to the solution time. It would benefit result file size though.

Re: Eigenfrequency with associated effective mass fraction

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Hello!,
In Real Eigenvalue Analysis (SOL103) you can use the MEFFMASS case control command to control the amount of modal content that is calculated. To do so, specify values for the MINT1, MINT2, and MINT3 describers (read the QRF for more info). NX NASTRAN solver continues to calculate modes until the total effective mass fractions in the translational X-, Y-, and Z-directions exceed the values you specify for the MINT1, MINT2, and MINT3 describers, respectively.

Best regards,
Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
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