Multi-state Model Updating based on Simplified Rocket Model
The continuous reduction of fuel during the rocket launch causes the rocket structure to change continuously,and the natural frequency and modal shape of the structure also change accordingly.Aiming at the inaccuracy of the finite element model,the moment of inertia of the section is used as the correction parameter,and the minimum error between the numerical simulation results and the experimental test results under different states is the objective function,and an optimization model for multi-state model correction is established.The objective function is explicitly processed by sensitivity analysis and first-order Taylor expansion,and the optimal solution of design variables is obtained by sequential linear programming.At the same time,for the multi-state structure,taking the multi-section simply supported beam model as an example,the simply supported beam is tested by the hammering method,and the magnetic attraction weight scheme is designed to simulate the multi-state model.An optimization model is established for the objective function,and the multi-section simply supported beam model is revised to a single-section simply supported beam model after modification,and the ratio of the moment of inertia of the section to the area is met,which verifies the accuracy of the multi-state model modification method.
multi-state model updatingsection moment of inertiaoptimal designsimplified rocket modelfinite element analysis
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