NASTRAN: Restart of a sol 106 into a sol 103

[NicolaPalettaPhD]

Could someone explain me how can I do a restart of a sol 106 into a sol 103? The purpose is to calculate normal modes by using differential stiffness matrix from sol 106 but by changing buoundary conditions.
In other words, I have to calculate free-free normal modes with sol 103 by using the differential stiffness matrix from sol 106. This last procedure has been used to calculate a non linear static solution with a self-balanced load condition (aerodynamic + inertial + propulsive loads) by restraining the FE model grid representative of the whole airplane center of gravity.

 

[GrandpaDave]

Good Morning... You might want to ask this question to the folks on the Structural Engineering/FEA forum. The pre and post processing FEA folks should know about solvers, especially NASTRAN. I haven't done differential stiffness analysis since working on rocket motor cases. You get the wrong answers if you use static analysis--- Grandpa Dave