In Abaqus, I used to do postbuckling analysis of a cylinder by doing a 2 step simulation. First step is a linear eigenvalue study to determine the natural frequency vibration of the structure. The result of the eingenvalue study is used to impose a displacement on the model using the *IMPERFECTION keyword. The 'imperfect' model is then subjected to a compression load using a static Riks procedure to calculate the post buckling. 

Now i would like to do a similar study using the Structural Performance Engineer role on the 3DExperience platform to analyse a pressure vessel. Is it possible to use the 'imperfections' method?