When running a random response analysis, we apply the load at a node with a constraint on it. What is Femap/Nastran doing internally to handle this? If the node is completely fixed, it seems like applying a load there should do nothing, which is clearly not what happens.
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If you apply enforced displacement/velocity/acceleration to nodes, then you should constrain nodes in direction of enforced motion load.
If you apply load, and get nonzero results, then post here simple example.