Direct frequency response analysis

[cocodrillo1]

Dear Users,

I have to do a response analysis of a certain construction (NX Siemens, Nastran solver 108, Direct frequency response analysis)

How do you define such excitation:
Excitation: 9.81 m/s² ≈1 g
Frequency Range: 10…..500 Hz
Sine-Sweep: 0.5 octave / min

Thank You, Regards, Peter

 

[RRDavid]

Hi!
Discretize the frequency range logarithmically and you can create a forcing frequencies modelling object. After that you can define the amplitude for each of the defined frequencies as a constaint (enforced displacement)

Be sure that when you are postprocessing the results you don't exceed the sweep rate.

Regards,
David