Simultaneously all the main parameters are determined according to the environment of fuselage airproof main frame and the design requirements in analyzing the rigidity and strength.

根据承力密封框的使用环境和设计要求，确定了对其进行刚度和强度分析时所需的各种主要参数；

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The wings are braced by dual steel wing struts, and are bolted to the fuselage at the cabin frame with four bolts for easy wing attachment and removal.

翅膀是支撑钢翼双支柱，并固定在去除附着在机身和机翼的客舱与四架螺栓容易。

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The method of optimization theory based on dual method was transplanted to design fuselage main frame, and the optimizing model of fuselage main frame was established.

将基于二次规划的准解析法优化理论应用于机身主要承力框的设计中，建立了机身主要承力框的优化模型。

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