基于遗传算法的舱门四连杆提升机构设计应用

Design of the 4-bar lift mechanism for aircraft door based on GA

现代民用飞机半堵塞式舱门设计中,使用提升机构来实现舱门挡块与机身挡块脱离以便开门。为保证舱门的安全性、操作性及维修性等因素,通常需要精心设计提升机构。针对四连杆提升机构,在当前利用优化理论寻找对应机构参数的研究基础上,结合实际中机构跨度大、提升轨迹短且变化大的特点,利用修改的遗传算法并构造相应的适应度函数,通过保证连杆上两个距离一定的点分别同时经过所需的目标轨迹来最终获得所需的提升机构的构型参数,此方法可有效辅助提升机构的设计。

For the design of a modern civil aircraft’s semi-blocking door,the lift mechanism is used to disengage the door block from the fuselage block to open the door.In order to ensure the safety,operability and maintainability of the door,it’s necessary to carefully develop the lift mechanism.In this article,for the 4-bar lift mechanism,based on the current research on identifying the mechanism-related parameters by means of the optimization theory,as well as combined with the mechanism’s characteristics of large span,short trajectory and significant change,the modified genetic algorithm is adopted to construct the fitness function.The configuration parameters of the lift mechanism are identified by ensuring that the two points at a certain distance on the connecting rod go through the desired trajectory at the same time.This method serves as a boon for the design of lift mechanism.