Error # 1664 free size optimisation RANDPS

Altair Forum User

Dear sir, i'm new one for the optimization, so some problem occurred during running size optimiztion. please help me.... *** ERROR # 1664 *** in the input data:  X must be greater than zero for auto spectral density.'

 

I create a rms displacement response and fot use that I create a RANDPS card. But I don't understand this card.

 

Any help please?

 

Best regards

Altair Forum User

Can you check the value for X in  RANDPS card? it should be greater than zero

Altair Forum User

It is the problem, I have no RANDPS card. So I have to create one but I don't know the value of the coefficient