Hi,
Sorry, but I am not sure if I understood your question clearly. Do you want to do the free-free or modal analysis of the steel plate? Also, how do you want to constrain the model? If you can explain how the plate is constrained in reality, then I can help you with the correct boundary conditions in Ansys. I have attached some links to our AIC courses which might be helpful for you.
Intro to Modal Analysis | Ansys Innovation Courses
Modal Analysis in Ansys Mechanical | Ansys Courses
Thanks,
Akshay Maniyar
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