Study on new method for modal parameters identification of stiffened plate with four clamped edges

In order to accurately and rapidly identify the vibration characteristic parameters of nonlinear stiffened plate structure, Rayleigh-Ritz method is used for modeling. First, the stiffened plate with four edges clamped is divided into plate and stiffeners. The plate is considered to be geometrically nonlinear, and the stiffeners are taken as Euler beams to solve the deformation energy and kinetic energy. Then, natural frequency of stiffened plate is solved by Rayleigh-Ritz method. Finally, stiffened plate structure in the laboratory is selected as the research object, results from Rayleigh - Ritz method calculation are compared with ANSYS and the swept frequency method results. The results show that the solution in this paper can be correct, which lays a good foundation for further nonlinear active control experiment.