I am having trouble validating the results of frequency studies in SW Simuation with published results and analytical calculations. In particular, I found a published result online that documents a frequency study performed in MATLAB and ANSYS with very close results that I cannot duplicate in SW Simulation. Here is the link to the document

http://www.mae.ncsu.edu/courses/mae533/klang/projects/Vibrating_Flat_Plate.pdf

SW Simulation does not even indicate the same mode shapes. Has anyone else tried to validate a frequency study?

I get the same frequencies and mode shapes but the author of the document does not appear to specify the BC, which has a major effect on the eignevector/eigenvalue solution. I set the nodal BC on the edges of the plate for no-translation, but allow rotation, and get the same shapes and frequencies. Hope that helps. There are numerous validation sets included with the software, including NAFEMS (look in Help/SolidWorks Simulation/Validation).