Multi-state model correction method based on unconstrained optimization model

The invention discloses a multi-state model correction method based on an unconstrained optimization model, and the method comprises the steps: determining a finite element model material, and inputting an optimization initial value; finding out the modal order most matched with the actual vibration mode in the finite element model, and calculating the relative error between the matched simulationfrequency value and the experimental frequency value; establishing a mathematical optimization model of each state, and setting an optimization step length and a convergence precision value thereof;according to the target function, gradually submitting the compiled optimization cards of all states to the MSC.Nastran, and extracting design variables after iteration and iteration convergence values of all the states; according to the extracted and iterated design variable optimal solutions of all the states and the iterative convergence values of all the states, gradually calling MSC.Nastran,and analyzing the model of