飞机骨架结构方案的优化设计

为了能够有效地降低飞机结构承力件的重量,针对飞机骨架,以加强框和普通框以及翼梁的概念设计为研究内容,通过对“敏度阈值“概念的分析,指出其不足,提出了“改进的敏度阈值“概念,并与“约束补偿“策略结合而形成新的拓扑优化算法,用于上述结构件的材料布局优化设计.多个算例中的拓扑优化结果均显示其结构型式十分新颖,值得深入地探讨.由此可以得出3点结论:(1)采用CAD/CAE和拓扑优化相结合用于飞机结构件的初始方案设计是可行的;(2)作者提出的“改进的敏度阈值“拓扑优化算法是有效的;(3)构建一种具有良好操作性的、有别于经验设计的飞机结构件概念设计新方法.

Optimal design of airframe on aircraft structure

In order to decrease the weight of aircraft structural part effectively,face to the skeleton of aircraft,the author regards the conceptual design of structural part(such as strengthen frame,general frame and canard beam) as research content.By analyzing the concept of 'gradient threshold' and pointing out its weakness,the author proposes the concept of 'modified gradient threshold' and combines it with the strategy of 'constraint compensation' to form a new kind of topology optimization algorithm for structural layout of structural parts.The topology optimization results of multiple examples show that their layouts are very innovative and are deserved to be studied in detail.So we can draw three conclusions.One is that using the combination of CAD/CAE and topology optimization for aircraft structural part above mentioned conceptual design is feasible.The other is that the proposed 'modified gradient threshold' topology optimization algorithm is effective.The last is that a new design approach with good operation which differs from conventional design method is constructed for structural part structure layout.