英德
有道
百度
谷歌
图片
维基
百科
翼梁
wing beam
- 机体结构上的修改着重于延长主翼梁的最低寿命（800小时），以进行多次渐进式阶段的改造方法来达到减少疲劳和延长寿命至1250小时的目标。
Structural modifications focus on increasing the minimum life of the wing main spar (originally set at 800 hours) have carried through several proposed progressive stages of modification with the intention of reducing fatigue problems and providing a life extension of up to 1,250 hours for a complete refurbishment with a newly manufactured main spar. - 探讨了一种新的设计指标最优分配方法--协同分配法,用于处理飞机顶层设计中的大规模设计指标最优分配问题.分析了飞机顶层设计中的设计指标最优分配特征,据此给出了协同法的原理并建立了数学模型.协同法按设计指标分配关系将最优分配问题分解为主系统优化和子系统优化,主优化对子系统设计指标进行最优分配,子优化以最小化分配设计指标值与期望设计指标值之间的差异为目标,进行子系统最优设计,或对底层元件(如飞机翼梁、翼肋和翼盒等)进行设计指标最优分配,并把最优解信息反馈给主优化.主优化通过子优化最优解信息构成的一致性约束协调分配量,提高系统整体性能,并重新给出分配方案.主系统与子系统反复协调,直到得到设计指标最优分配方案.两层可靠度指标分配算例初步验证了本文方法的正确性与可行性,三层可靠度指标分配算例证明了本文方法的有效性.最后,以重量指标分配为例,简要叙述了针对飞机顶层设计中设计指标协同分配的数学模型和求解思路.
A new method,Collaborative Allocation (CA),is proposed to solve the large-scale optimum allocation problem in aircraft conceptual design.According to the characteristics of optimum allocation in aircraft conceptual design.The principle and mathematical model of CA are established.The optimum allocation problem is decomposed into one main optimization problem and several sub-optimization problems.A group of design requirements for subsystems are provided by the main system respectively,and the subsystems execute their own optimizations or further provide the detailed design requirements to the bottom components of aircraft,such as spars,ribs and skins,etc.The subsystems minimize the discrepancy between their own local variables and the corresponding allocated values,and then return the optimization results to main optimization.The main optimization is performed to reallocate the design requirements for improving the integration performance and progressing toward the compatibilities among subsystems.CA provides the general optimum allocation architecture and is easy to be carried out.Furthermore,the concurrent computation can also be realized.Two examples of optimum reliability allocation are used to describe the implementation procedure of CA for two-level allocation and three-level allocation respectively,and to validate preliminarily its correctness and effectiveness.It is shown that the developed method can be successfully used in optimum allocation of design requirements.Then taking weight requirement allocation as example,the mathematical model and solution procedure for collaborative allocation of design requirements in aircraft conceptual design are briefly depicted. - 文摘:探讨了一种新的设计指标最优分配方法--协同分配法,用于处理飞机顶层设计中的大规模设计指标最优分配问题.分析了飞机顶层设计中的设计指标最优分配特征,据此给出了协同法的原理并建立了数学模型.协同法按设计指标分配关系将最优分配问题分解为主系统优化和子系统优化,主优化对子系统设计指标进行最优分配,子优化以最小化分配设计指标值与期望设计指标值之间的差异为目标,进行子系统最优设计,或对底层元件(如飞机翼梁、翼肋和翼盒等)进行设计指标最优分配,并把最优解信息反馈给主优化.主优化通过子优化最优解信息构成的一致性约束协调分配量,提高系统整体性能,并重新给出分配方案.主系统与子系统反复协调,直到得到设计指标最优分配方案.两层可靠度指标分配算例初步验证了本文方法的正确性与可行性,三层可靠度指标分配算例证明了本文方法的有效性.最后,以重量指标分配为例,简要叙述了针对飞机顶层设计中设计指标协同分配的数学模型和求解思路.
Abstract: A new method,Collaborative Allocation (CA),is proposed to solve the large-scale optimum allocation problem in aircraft conceptual design.According to the characteristics of optimum allocation in aircraft conceptual design.The principle and mathematical model of CA are established.The optimum allocation problem is decomposed into one main optimization problem and several sub-optimization problems.A group of design requirements for subsystems are provided by the main system respectively,and the subsystems execute their own optimizations or further provide the detailed design requirements to the bottom components of aircraft,such as spars,ribs and skins,etc.The subsystems minimize the discrepancy between their own local variables and the corresponding allocated values,and then return the optimization results to main optimization.The main optimization is performed to reallocate the design requirements for improving the integration performance and progressing toward the compatibilities among subsystems.CA provides the general optimum allocation architecture and is easy to be carried out.Furthermore,the concurrent computation can also be realized.Two examples of optimum reliability allocation are used to describe the implementation procedure of CA for two-level allocation and three-level allocation respectively,and to validate preliminarily its correctness and effectiveness.It is shown that the developed method can be successfully used in optimum allocation of design requirements.Then taking weight requirement allocation as example,the mathematical model and solution procedure for collaborative allocation of design requirements in aircraft conceptual design are briefly depicted.
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