基于PRSEUS结构的翼身融合民机中央机体球亏面框优化设计方法

Optimization design method of central fuselage spherical deficient surface frames in blended-wing-body civil aircraft based on PRSEUS structure

翼身融合(BWB)是一种非常规亚声速运输机布局形式。针对该布局下民机后压力框的设计问题,基于美国国家航空航天局(NASA)提出的拉挤杆缝合一体化(PRSEUS)结构,开展了中央机体球亏面框优化设计工作。分别建立了某型BWB民机铝合金平面框、PRSEUS球亏面框有限元模型,数值模拟结果显示,PRSEUS球亏面框具有更好的承载性能、更低的结构重量。在此基础上,进一步对PRSEUS球亏面框开展敏度分析,对其静强度、稳定性的影响参数进行了梳理,对影响规律进行了归纳。通过分析关键参数在协同优化过程中的影响,筛选得到了一种基于代理模型的协同优化策略,该协同优化策略适用性强、优化效率高。利用该协同优化方法,对PRSEUS球亏面框的尺寸参数进行了优化。通过对优化结果的最优性分析,获得了兼顾静强度、稳定性的优化方案,优化后的PRSEUS球亏面框重量减轻了10.6%。设计的PRSEUS球亏面框承载效率高、稳定性能好,可为相关领域设计与研究人员提供参考。

The Blended Wing Body(BwB)layout is an unconventional subsonic transport aircraft configuration.To address the design challenges of the aft pressure frame in this layout,this paper conducts optimization design work on the central fuselage circumferential frame using NASA's proposed Pultruded Rod Stitched Efficient Unitized Structure(PRSEUS)concept.Finite element models are separately established for a certain type of BWB aircraft's aluminum flat frame and the PRSEUS pherical deficient surfaces frame.Numerical simulations and comparisons reveal that the PRSEUS pherical deficient surfaces frame exhibits superior load-bearing performance and lower structural weight.Building upon this,the paper performs further sensitivity analysis on the PRSEUS pherical deficient surfaces frame,identifying influential parameters related to its static strength and stability,and summarizing the impact patterns.By analyzing the effects of key parameters in the collaborative optimization process,a synergy optimization strategy based on surrogate models is developed,known for its strong applicability and high efficiency.Employing this collab-orative optimization approach,the paper optimizes the dimensions of the PRSEUS pherical deficient surfaces frame.Through a thorough optimality analysis of the results,an optimized solution that balances static strength and stability is achieved,reducing the weight of the PRSEUS pherical deficient surfaces frame by 10.6%.The designed PRSEUS pherical deficient surfaces frame excels in load-carrying efficiency and stability,whichoffers valuable insights to design-ers and researchers in related fields.