Reliability optimization Design of Solid Rocket Nozzle Cover

In order to improve the reliability of the opening action of the nozzle cover of a certain type of solid rocket and meet the reliability index of the stamping speed and the opening pressure of the cover when it is opened, in this paper, simulation and experiment are combined to optimize the design of plugging cover. Firstly, the Box-Benhnken method is used to design the experiment, and the finite element analysis method is used to carry out the simulation test. The reliability index function is obtained by regression fitting of the simulation test data. Then, the response surface method is used to optimize the design of the cover whose diameter is 170 mm. And the cover with optimized structure is installed in the cover opening experiment system for experiment, which verifies the accuracy of the simulation.