Efficient aerostructural optimization of helicopter rotors toward aeroacoustic noise reduction using multilevel hierarchical kriging model
Efficient aerostructural optimization of helicopter rotors toward aeroacoustic noise reduction using multilevel hierarchical kriging model
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DOI：
10.1016/j.ast.2022.107683
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发表时间：
2022-06-15
影响因子：
5.6
通讯作者：
Zhang, Yu
中科院分区：
文献类型：
--
作者：
Bu, Yue-Peng;Song, Wen-Ping;Zhang, Yu
Aerostructural design optimizations of helicopter rotors based-on high-fidelity numerical simulations present a great challenge due to extremely large computational costs. In order to improve optimization efficiency by introducing assistance from cheap low-fidelity simulations, this article proposes to use a multilevel hierarchical kriging (MHK) model, which can incorporate three or more levels of fidelity to accelerate the convergence of a high-fidelity aerostructural optimization of helicopter rotors towards the global optimum. The optimization strategy is implemented by three steps. Firstly, a single-fidelity optimization is conducted based on kriging models and low-fidelity simulations. Secondly, a bi-fidelity optimization is performed based on hierarchical kriging (HK) models with pre-calculated low-fidelity samples and additional medium-fidelity samples. Finally, a multi-fidelity optimization is conducted towards the high-fidelity optimum based on MHK models with pre-generated low-and medium-fidelity samples and additional high-fidelity samples. The high-fidelity analysis is defined as coupled computational structural dynamics (CSD) and computational fluid dynamics (CFD) simulations, and the medium and low-fidelity analyses are defined as merely CFD simulations on fine and coarse computational grids, respectively. To verify the effectiveness of MHK models in rotor optimizations, a blade shape optimization for aeroacoustic noise reduction is carried out by using the proposed optimization strategy. Results show that the total cost of an MHK-based optimization is around 49% less than that of a kriging-based optimization. Besides, by using kriging-and HK-based optimizations the aeroacoustic noises are reduced by 6.84 dB after 175 evaluations and 102 evaluations, respectively, while an MHK-based optimization could achieve the same noise reduction with only 54 evaluations. This example demonstrates that an MHK-based multi-fidelity optimization method can significantly improve the efficiency of aerostructural optimizations for helicopter rotors. (C) 2022 Elsevier Masson SAS. All rights reserved.
