优化驱动的起落架结构设计方法

Optimization-driven design method of landing gear structure

起落架结构是飞机上最复杂最重要的结构之一,传统的设计方法依靠人工经验反复迭代,没有充分利用结构优化技术,具有设计周期长且不能最大限度得到最优设计的缺点。根据结构优化技术的发展,提出了优化驱动的起落架结构设计方法,实现了优化驱动的设计方法在起落架领域的完整工程应用。结构优化技术作为整个设计流程的驱动者,在其中发挥贯穿全程的主体作用,根据不同设计阶段的需求,先后运用拓扑优化、尺寸优化和形状优化技术。以某型飞机前起落架外筒的设计为例可以发现,相比传统设计方法,新方法在相同的设计约束条件下,能更快得到设计方案,结构质量减少了24.1%,实现了起落架结构的快速设计和轻量化设计。

Landing gear structure is one of the most complex and important structures in aircraft.The traditional method for aircraft landing gear design is an iterative process relied on the experience of human,which does not take advantage of the important structural optimization technology,so the design cycles still seem long and the outcome is seldom the best.In this paper,optimization-driven design method of landing gear structural is proposed based on the development history of structural design process.This is the first application of the optimization-driven method in landing gear structural design.As a driver,optimization technology plays a main role throughout the entire design process.Topology optimization,size optimization and shape optimization are applied to the method according to different demands.Taking a certain type of landing gear cylinder design for example,both the current method and optimization-driven method are used for comparison.The results show that the new method reduces the weight of the strut cylinder by 24.1%,improves the efficiency and performance of the landing gear structural design and also achieves a rapid and lightweight design.