Abaqus - Random Vibration Mises

Hi All,

Here I have one question about RV Mises stress.

From theory guideline, I think there's relationship between input PSD and output Mises.

I create three acc. PSD input at each direction as below:

*Base Motion, type=ACCELERATION, dof=1, scale=1., load case=1
*Correlation, type=CORRELATED, psd=PSD_x, complex=NO
1, 1.
*Base Motion, type=ACCELERATION, dof=2, scale=1., load case=2
*Correlation, type=CORRELATED, psd=PSD_y, complex=NO
2, 1.
*Base Motion, type=ACCELERATION, dof=3, scale=1., load case=3
*Correlation, type=CORRELATED, psd=PSD_z, complex=NO
3, 1.


So can I estimate S_mises@node1 = a * PSD_x + b * PSD_y + c*PSD_z via para a,b c?


Thanks in advance

PING

Abaqus ​​​​​​​