顶部凹陷贮箱膜片典型结构特征优化实现

用正交法表数值研究了顸部凹陷区域直径与深度及膜片厚度典型结构特征对膜片翻转行为的影响，获得膜片在不同结构特征时的屈曲与后屈曲状态。研究发现：膜片翻转效率及屈曲载荷随厚度增加而提高，顶部凹陷直径对膜片翻转效率及屈曲栽荷的影响显著，深度仅影响屈曲载荷；膜片后屈曲阶段均出现平台效应，翻转稳定，说明顶部凹陷结构膜片利于完成推进剂的管理与控制功能。由屈曲载荷与翻转效率，得到了凹陷直径与深度及膜片厚度优化选择范围。

Research on Typical Structure Characteristics Optimization of Spherical-Dished Diaphragms for Positive Expulsion Tanks

The effects of diameter and depth of dished section and thickness of diaphragms on positive expulsion process of spherical-dished diaphragms based on orthogonal test table by finite element method （FEM） was numerically analyzed by orthogonal table in this paper. The analysis results of buckling and post-buckling equilibrium configurations of diaphragms with different structure characteristics were worked out. It was found that the expulsion efficiency and buckling loads of diaphragms increased with the increasing of thickness, and diameter of dished section had a marked effect on expulsion efficiency and buckling loads of diaphragms, while depth of dished section only influenced buckling load; that platform effect was presented in the post-buckling stage and expulsion process of diaphragms was stable indicated spherical dished diaphragms would help to finish functions of management and control propellant. The optimization results of the typical structure characteristics were got based on buckling load and expulsion efficiency.