Structure optimization of high altitude vehicle test cabin

ZHANG Xin, LI Yi , LI Jia-chun, WU Bing
(Department of Mechanical Engineering, Guizhou University, Guiyang 550025, China)

Abstract: Aiming at the problem that the high altitude vehicle test cabin structure has excessive mass and the cabin fails in extreme working conditions, the static and dynamic performance of the main structure of the middle section dynamometer cabin was studied. Taking the maximum stiffness and the maximum dynamic loworder natural frequency under the static load of the dynamometer cabin as the objective, the multiobjective function defined by the eclectic programming method and the average frequency method was used to optimize the structure topology, the unit density diagram of the structure was obtained, and the weak link of the cabin structure was found out. Based on this, the cabin structure after the topology optimization was rearranged, and the mathematical parameters of the size were constructed. The thickness of key size stiffeners and skin parameters were optimized. The results indicate that the structure mass of the cabin after optimization is reduced by 10.9%, the first three natural frequencies are increased by 6.2%~7.8%, and the maximum deformation is reduced by 13.6%. Although the maximum equivalent stress is increased by 24%, all indexes still meet the design requirements of the working condition of the cabin, and the optimization purpose is finally achieved.
Key words: altitude cabin; shell structure; stiffener; topology optimization; parameter optimization