用数据修正经典升力线理论,提升低展弦比机翼预测精度。
Data-informed lifting line theory
- 通过并行神经网络融合局部气动点与全局几何参数,学习对升力线理论的修正。
- 在低展弦比和高后掠条件下,准确捕捉三维非定常升阻分布,超越传统理论。
- 保留原有计算效率,适合早期飞机设计优化,也适用于螺旋桨等场景。
我们提出一种数据驱动框架,通过引入面板法模拟的高保真气动数据,扩展经典升力线理论(LLT)的预测范围。开发了一种包含卷积层与全连接层的神经网络架构,由两个并行子网络组成,分别处理展向节点信息与全局几何/气动输入(如迎角、弦长、扭转、机翼剖面分布、后掠角)。在多种配置中,该结构最有效学习了对LLT输出的修正。训练后的模型在低展弦比与高后掠等传统理论失效区域,成功捕捉到展向升力与阻力分布的高阶三维效应,并展现出良好的泛化能力,可推广至训练数据范围外的机翼构型。该方法保持了LLT的计算高效性,适用于气动优化循环与早期飞机设计研究。本方案为低阶模型嵌入高保真修正提供了实用路径,亦可拓展至螺旋桨性能预测等任务。
原文摘要 · Abstract (English)
We present a data-driven framework that extends the predictive capability of classical lifting-line theory (LLT) to a wider aerodynamic regime by incorporating higher-fidelity aerodynamic data from panel method simulations. A neural network architecture with a convolutional layer followed by fully connected layers is developed, comprising two parallel subnetworks to separately process spanwise collocation points and global geometric/aerodynamic inputs such as angle of attack, chord, twist, airfoil distribution, and sweep. Among several configurations tested, this architecture is most effective in learning corrections to LLT outputs. The trained model captures higher-order three-dimensional effects in spanwise lift and drag distributions in regimes where LLT is inaccurate, such as low aspect ratios and high sweep, and generalizes well to wing configurations outside both the LLT regime and the training data range. The method retains LLT's computational efficiency, enabling integration into aerodynamic optimization loops and early-stage aircraft design studies. This approach offers a practical path for embedding high-fidelity corrections into low-order methods and may be extended to other aerodynamic prediction tasks, such as propeller performance.
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