The content of this article derives and solves in detail the vibration differential equation of elastic thin plate and the natural frequency calculation formula of simply supported rectangular thin plate. The natural frequency of simply supported rectangular thin plate is calculated by the calculation method of Ritz theory. At the same time, combined with the finite element software ANSYS calculates and analyzes the natural frequency of the elastic thin plate. The results show that the analysis and calculation of the finite element software can not only solve the engineering problem faster, but also the accuracy of the result is reliable.
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