基于耦合伴随方法的串/并行气动结构优化设计对比

雷锐午; 白俊强; 许丹阳; 张煜; 汪辉

doi:10.13224/j.cnki.jasp.2019.05.009

基于耦合伴随方法的串/并行气动结构优化设计对比

doi: 10.13224/j.cnki.jasp.2019.05.009

西北工业大学航空学院，西安 710072

基金项目: 十二五民机预研项目；航空基金（20161453011）；国家自然科学基金（51806178）；国家某重点专项资助项目（MJ-2015-F-010）

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出版历程
- 收稿日期: 2018-09-26
- 刊出日期: 2019-05-28

Speciality assessment of sequential and concurrent aerostructuraloptimization based on coupled adjoint technique

摘要

摘要: 采用RANS方程、线性有限元分析手段、映射点局部插值方法和逆距离动网格技术对气动和结构之间的耦合现象进行了分析。然后基于气动结构耦合伴随方法，对气动和结构设计变量梯度进行了高效求解。最后结合自由曲面变形技术、梯度优化方法构建气动结构优化设计框架。选取飞翼布局民用客机开展气动结构串行与并行优化设计研究。在相同阻力水平的前提下，并行优化结果比串行优化获得了8.4%航程收益和8.3%结构质量收益。同时，串行优化设计结果在中翼段上翼面仍然存在明显激波，而并行优化结果呈现光滑的等间距等压线分布特征。因此并行气动结构优化设计方法可以充分挖掘气动结构耦合下的设计潜力，更有利于对大柔性气动结构优化设计问题进行研究。
- 气动结构耦合伴随 /
- 气动弹性分析 /
- 气动结构优化 /
- 串/并行优化 /
- 飞翼布局
Abstract: The RANS(Reynolds-averaged Navier-Stokes) equation, linear finite element analysis method, local mapping point link method and inverse distance weighting interpolation method were used to analyze the coupling between aerodynamic and structural variables. The gradients of merit function to aerodynamic and structure design variables were solved efficiently using aerostructural coupled adjoint technique. These modules were integrated with free form deformation module and gradient-based optimizer to form an aerostructural optimization design framework. A blend wing body aircraft was chosen to conduct sequential and concurrent aerostructural optimization. Results showed that the concurrent approach achieved 8.4% more range and 8.3% less structural weight, compared with the sequential approach on the same drag level. Moreover, the sequential approach had obvious shock wave on a significant portion of the outer wing. Meanwhile, the concurrent approach exhibited parallel pressure contour lines with roughly equal spacing indicating a shock-free result. All the results confirm that concurrent optimization for the design of the aeroelastic system provides significant advantages over the sequential approach. Given these improvements, the presented methods have the potential to be a useful tool in high flexibility aeroelastic design problems.
- aerostructural coupled adjoint /
- aeroelastic analysis /
- aerostructural optimization /
- sequential and concurrent optimization /
- blended wing body

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