火箭多级筒燃气弹射动力学特性及影响因素

The dynamic characteristics of a multistage canister gas ejection structure and the influencing factors during ejection are analyzed to improve the ejection performance of rockets and to study the safety of gas ejection structure. The structural composition,topological relationship and excitation load of the rocket multistage canister ejection system are analyzed,and a finite element model of the ejection system are established for simulation analysis. Through experiments,it is verified that the simulation accuracy of finite element model meets the simulation requirements. The influences of the gap of cylinder section,the thrust eccentricity and the launch angle on the safety of multistage canister gas ejection structure are analyzed based on the finite element model. It’s found that the launch angle is the main influencing factor that affects the ejection safety,and the gap between the cylinder sections and the thrust eccentricity have also effect on the ejection safety. he influencing factors lead to the ejection deflection of rocket,the interaction force between the canister sections and the increase in the maximum lateral displacement. When the gap between the canister sections is increased to 0. 3 mm or the launch angle is deflected to 3◦, a greater threat will be posed to ejection safety.