摘要
为了能够合理地降低飞机结构重量系数 ,针对飞机改进设计 ,以普通框为研究目标 ,通过对“敏度阈值”的改进 ,提出“敏度变阈值”概念 ,并与“约束补偿”策略结合而形成拓扑优化算法 ,来用于普通框的轻量化设计。以某一轻型小飞机的后段一普通框为例 ,拓扑优化结果表明 :(1)等材料设计时 ,刚度提高 4 0 % ;(2 )等刚度设计时 ,材料用量减少 30 %。由此可以得出 :(1)基于“敏度变阈值”的拓扑优化算法用于飞机普通框改进设计 ,是可行和有效的 ;(2 )给出了一种具有可操作性的设计方法 ,用以实现框结构“等刚度”的设计思想 ;(3)所给出的方法易于飞机结构设计人员接受与掌握 ,并且方便地用于将来的框结构改进设计之中。
This paper presents the “Gradient Variable-Threshold” concept, derived from “Gradient-Threshold”, which generates a topology optimization algorithm in combination with the Constraint Compensation strategy to be used for weight-minimization design of fuselage frames, Thus reasonably reducing the aircraft airframe weight coefficient. As an example, a fuselage frame in the aft fuselage section of light aircraft is considered in the topology optimization. The optimization results indicate that a stiffness increment of 40% is obtained for the same-material design and a material decrement of 30% for the constant-stiffness design. It is seen thereby that (1) the “Gradient Variable-Threshold” based topology optimization algorithm used for frame design modification is practicable and effective; (2) an operatable design tool will be provided for the constant-stiffness design of fuselage frames; and (3) it can be expected that the given algorithm will be broadly accepted and easely used for future frame structure design modification.
出处
《飞机设计》
2004年第3期25-30,共6页
Aircraft Design
基金
中国博士后科学基金 (2 0 0 2 0 3 2 2 2 2 )"
"航空科学基金 (0 3 65 3 0 0 3 )"
关键词
飞机结构
改型设计
刚度设计
拓扑优化
材料用量
重量
设计思想
计时
阈值
算法
improved design
aircraft frame
minimization
topology optimization
gradient variable-threshold
constraint compensation
