Abstract
In order to improve the design quality and optimization efficiency for blended-wing-body underwater glider(BWBUG) shape design optimization problems, a surrogate-based blended-wing-body underwater glider shape optimization(SBUGSO) framework is proposed. The aim is to maximize the lift to drag ratio(LDR) of BWBUG with the constrain that the displacement volume of the optimal shape is larger than that of the initial shape. The LDR of the optimal BWBUG is improved by 24.32% with acceptable computational resources. The optimization results show that the present SBUGSO framework can efficiently decrease the computational resource, and improve the hydrodynamic performance and loading capacity of BWBUG. Comparing with the other optimization algorithms, SBUGSO framework shows the significant superiority.
Highlights
The LDR of the optimal BWBUG is improved by 24.32% with acceptable computational resources
The optimization results show that the present SBUGSO framework can efficiently decrease the computational resource, and improve the hydrody⁃ namic performance and loading capacity of BWBUG
Æ1.School of Marine Science and Technology, Northwestern Polytechnical University, Xi′an 710072, China; ö çç.Key Laboratory for Unmanned Underwater Vehicle, Northwestern Polytechnical University, Xi′an 710072, China;÷÷
Summary
BWBUG 外形采用翼身融合布局,整体沿翼展 方向各截面均为 NACA00XX 对称翼型, 如图 1 所 示。 本文在保持 BWBUG 总体 外形轮廓不变前提下,选择了 7 个关键位置处的截面翼型进行优化,通 过 unigraphics NX( UG) 软件利用优化翼型重新生成 BWBUG 优化 外 形。 站位翼型的选取参考了文献 [9],图 2 给出了位置示意图。 图中 l1 ~ l7 和 d1 ~ d7 分别表示翼型与中心截面翼型前缘的水平和垂 直 距 离, 具体参数值如表 1 所 示。 对 称 结 构 BWBUG 外形拥有诸多优点,本文将保证优化后的 外形仍为上下对称、左右对称。
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