面向加工的航空整体加强框孔布局优化设计

Hole Layout Optimization of Aeronautical Integrated Reinforced Bulkhead for Machining

航空整体加强框铣削加工过程中,工艺孔布局设计的合理性对其弹性变形的影响非常显著。针对航空整体加强框孔数与孔位设计依靠经验法和试错法的现状,提出一种面向加工的孔布局优化设计方法。首先,基于孔在制造中承担工艺功能的不同,将其分为主定位孔与辅定位孔两类;接着,初始化主定位孔布局,利用有限元法仿真铣削加工过程,以最大铣削变形量最小为目标,确定该主定位孔布局对应的辅定位孔布局;然后,以铣削变形平均值最小为目标,结合萤火虫算法与加权法实现最优主定位孔布局的搜索;最后,以某航空典型整体加强框为例,验证了该方法的可行性和有效性。

Deriving the optimal holes layout of aeronautical integrated reinforced bulkhead is critical to minimizing the elastic de formation in the process of milling.The traditional holes layout(location)design process is executed by empirical method and tri al-and-error method.A method for optimum holes location layout of aeronautical integrated reinforced bulkhead for milling is introduced.First,the holes are classified into main location holes and auxiliary location holes by classify methods based on the different technological functions during manufacturing.Second,one main location hole layout is initialized,the simulation of milling process is achieved through finite element method.The minimum maximum of milling deformation is taken as objective function for determining the auxiliary location holes layout corresponding to the initialized main location holes layout.Then,the method,aimed at minimizing the average value of milling deformation,uses the iteratively search of the firefly algorithm and weighting method to realize the optimization of the main location hole layouts.Finally,taking typical aircraft integrated rein forced bulkhead as an example,the feasibility and validity of the method is verified.