基于高精度模型的机翼气动结构多学科设计优化方法

利用低自由度协同优化方法对轻型飞机机翼进行了气动/结构多学科设计优化,气动和结构两个子系统实现了并行,其中气动分析采用CFD软件Fluent,结构分析优化采用有限元软件MSC.Patran＆Nastran。建立了基于Catia、Gambit和Fluent等通用软件的气动自动化分析模型。提出了利用三系数四次响应面模型拟合机翼上的升力分布以实现不同子系统并行和气动力的传递。以气动自动化分析模型和三系数四次响应面气动载荷分布模型为基础,提出了面向高精度气动分析的气动分析代理模型的建立方法。机翼优化结果表明LDFCO/V1方法可以成功地利用高精度模型实现机翼气动/结构多学科设计优化。

Study on multidisciplinary aerodynamic-structural design optimization of wings based on high fidelity models

Low degree-of-freedom collaborative optimization was applied to solve multidisciplinary aerodynamic-structural design optimization of a light aircraft wing. The structure subsystem and the aerodynamics subsystem are parallel. Aerodynamics performance was calculated with Fluent. Structure analysis was performed using MSC. Patran and Nastran. Based on Catia, Gambit and Fluent, an aerodynamics automatic analysis model was proposed. In order to transfer aerodynamics load among different subsystems, a quartic response surface with three coefficients was developed to fit lift distribution. Based on the aerodynamics automatic analysis model and the quartic response surface with three coefficients, a construction method of aerodynamics analysis surrogate models for high fidelity aerodynamics analysis was proposed. The results show that Low Degree-of-freedom Collaborative Optimization can be applied to multidisciplinary design optimization of wings with high fidelity models successfully.