自适应设计空间扩展的高效代理模型气动优化设计方法

doi:10.7527/S1000-6893.2018.21745

流体力学与飞行力学

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自适应设计空间扩展的高效代理模型气动优化设计方法

王超¹, 高正红¹, 张伟¹, 夏露¹, 黄江涛²

1. 西北工业大学航空学院,西安 710072;
2. 中国空气动力研究与发展中心计算空气动力研究所,绵阳 621000

收稿日期:2017-09-15 修回日期:2018-04-17 出版日期:2018-07-15 发布日期:2018-07-27
通讯作者: 高正红 E-mail:zgao@nwpu.edu.cn
基金资助:
国家自然科学基金（11372254，11402288）

Efficient surrogate-based aerodynamic design optimization method with adaptive design space expansion

WANG Chao¹, GAO Zhenghong¹, ZHANG Wei¹, XIA Lu¹, HUANG Jiangtao²

1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
2. Computational Aerodynamics Institute, China Aerodynamic Research and Development Center, Mianyang 621000, China

Received:2017-09-15 Revised:2018-04-17 Online:2018-07-15 Published:2018-07-27
Supported by:
National Natural Science Foundation of China (11372254,11402288)

摘要/Abstract

摘要： 对基于Kriging模型气动优化的加点方法和设计空间的构建问题进行了研究。首先，针对高效全局优化（EGO）方法收敛缓慢的问题，提出了一种混合加点方法，该方法通过引入期望提高（EI）阈值控制EI和最小预测值（MP）加点准则，利用先全局再局部的优化思想，提高了EGO方法在确定设计空间内的收敛性。其次，针对设计空间的构建问题，对比了扩大设计变量范围和多轮优化两种不同的设计空间构建方法，分析了设计变量范围对设计空间大小和样本密度的影响，进而提出了自适应设计空间扩展的代理模型优化方法。相对于传统固定设计空间的方法，自适应设计空间扩展的方法在动态的设计空间中进行优化搜索，只在有潜力的维度扩展设计变量范围，通过构建自适应设计空间，实现了样本的高效配置。最后，通过ADODG标准翼型优化算例证实，自适应设计空间优化方法可以大幅提高气动优化设计效率。

关键词: Kriging模型, 高效全局优化, 气动优化, 混合加点方法, 自适应设计空间

Abstract: The infill criterion and design space construction in Kriging-based aerodynamic shape optimization are studied in this paper. A hybrid infill method is proposed, which combines the Expected Improvement (EI) criterion and the Minimum Prediction (MP) criterion using an EI threshold. Global exploration is first implemented by the IE criterion, and local exploitation is then implemented by the MP criterion. Consequently, the convergence rate of Efficient Global Optimization (EGO) is accelerated in a certain design space. To find the global optimum in aerodynamic shape optimization, expansion of the design variable range and multi-round method are employed. Influence of the variable range on the size of design space and density of samples are discussed. To improve the efficiency of samples, an adaptive design space expansion method is proposed. In this method, the design space is dynamic and the range of design variable is expanded in potential dimensions. Accordingly, the samples are allocated efficiently through adaptive expansion of design space boundaries. ADODG airfoil optimization cases show that the adaptive design space expansion method has remarkable superiority over the conventional fixed design space method.

Key words: Kriging model, efficient global optimization, aerodynamic optimization, hybrid infill method, adaptive design space

中图分类号:

V211

王超, 高正红, 张伟, 夏露, 黄江涛. 自适应设计空间扩展的高效代理模型气动优化设计方法[J]. 航空学报, 2018, 39(7): 121745-121745.

WANG Chao, GAO Zhenghong, ZHANG Wei, XIA Lu, HUANG Jiangtao. Efficient surrogate-based aerodynamic design optimization method with adaptive design space expansion[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(7): 121745-121745.

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自适应设计空间扩展的高效代理模型气动优化设计方法

Efficient surrogate-based aerodynamic design optimization method with adaptive design space expansion

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