机身加强框结构刚度优化设计研究

以某型飞机翼身结合加强框为例,利用有限元法进行其刚度性能的优化设计。首先,分析确定翼身结合框的可靠性安全载荷,建立全新的结构刚度模型,利用有限元法分析求解刚度指标。然后根据结构设计要求和限制条件,基于应力应变特性和拓扑优化分析结果,优选设计参数,提出改进模型。通过对比分析结果,表明模型改进达到了结构刚度优化设计的目的。

Optimal design of fuselage bulkhead structure stiffness

Based on the wing-body bulkhead structure of some aircraft, the optimization design was conducted by the finite element method. Through the analysis of a prototype wing-body combination frame, the reliability safety load was determined and the new stiffness model was established. Through finite element method of Nastran, the structure stiffness was calculated and the stress and deformation analysis was carried out. Considering the frame environmental conditions and the structural design requirements, based on the stress and deformation results and topology optimization analysis results, some important structural design parameters were chosen. Based on the new design parameters, a new optimal model was created. Through comparison between the old model and the new one, it is demonstrated our aim of stiffness optimization is accomplished.