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Hello everyone, I would like to ask for an advice in solving a modal problem on a preloaded structure. I know that this is easily attainable with linear statics using STATSUB card, but I would like to find normal modes of a structure after non-linear static analysis (with contacts). Is it possible to run this sequence of analyses in OptiStruct: nonlinear statics --> normal modes? If not, would you have any suggestions how to do this? Best regards, Jakub