Multi-disciplinary optimization design method and application of BWB fuselage structure based on PRSEUS configuration

基于PRSEUS构型翼身融合机体结构多学科优化设计方法与应用

¹ Aircraft Strength Research Institute of China, Xi’an 710065, China
² National Key Laboratory of Strength and Structural Integrity, Xi’an 710065, China

Received: 26 August 2023

Abstract

Aiming at the problems such as low structural bearing efficiency, structural weight gain, heavy load and cabin noise caused by high rear backbraced engine in BWB layout, based on novel materials and pultruded rod stitched efficient unitized structure(PRSEUS), a multi-disciplinary optimization design method for unconventional circular body structures with aerodynamic, noise, vibration and technological constraints was studied to improve the bearing efficiency and lightweight of structures. Based on the adaptive agent model construction technology, an agent model for the performance analysis of the aerodynamic and noise subsystem of the airframe structure is established to predict the aerodynamic load and noise performance of the airframe structure, and the basic requirements of the aerodynamic and noise performance are transformed into constraints such as geometric size and mechanical response, so that the multi-disciplinary problems are concentrated in a set of finite element analysis model with efficient mathematical programming method. The time-consuming problem of multi-disciplinary high-precision model analysis is solved, and the multi-disciplinary optimization design of the wing-body integrated body structure is realized. Through the finite element analysis of the body structure, the bearing efficiency of the structure has been greatly improved, and the weight loss rate of the central body structure has reached 8.7% under the premise of meeting the constraints of various disciplines.

摘要

针对翼身融合(BWB)布局机体结构承载效率低、结构增重以及高后置背撑发动机带来的大载荷和舱内噪声等问题, 基于新型材料和新型高效承载结构(PRSEUS), 开展以提高结构承载效率和轻量化为目标, 兼顾气动、噪声、振动及工艺等多学科约束的非常规圆截面机体结构多学科优化设计方法研究。基于自适应代理模型构建技术建立了机体结构气动、噪声子系统性能分析代理模型, 实现了对机体结构气动载荷、噪声性能的预测, 并将气动、噪声性能的基本要求转化为几何尺寸及力学响应等约束条件, 从而把多学科问题集成到一套有限元分析模型, 配合高效数学规划法, 解决了多学科高精度模型分析耗时问题, 实现了翼身融合机体结构的多学科优化设计。通过机体结构有限元分析验证, 在满足各学科约束条件前提下, 结构的承载效率得到较大幅度提升, 中央机体结构减质率达到了8.7%。