基于图神经网络的船体点云兴波阻力快速预报模型—PB-GraphPR

Fast Prediction Model of Hull Point Cloud Wave Resistance Based on Graph Neural Network—PB-GraphPR

  • 摘要:目的】目前,近似技术已广泛应用于船型优化设计过程中,用于缓解高精度数值计算带来的高成本与长周期问题。但现有的近似模型通常依赖预先定义的参数化建模方法与人工定义参数,难以统一表达船体几何,且不利于后期数据集的扩展与通用预报模型的构建。【方法】针对上述问题,提出一种以船体三维型值点云为输入,基于图神经网络的兴波阻力系数快速预报模型(PB-GraphPR)。该模型在动态图卷积神经网络(DGCNN)的基础上,构建了多邻域并联特征提取结构,实现了对船体局部几何细节与全局型线特征的互补学习与有效整合。【结果】结果表明,PB-GraphPR模型能够准确地对Series60标模的兴波阻力系数进行快速预报,测试集决定系数R2可达98.9%,并通过梯度加权热力图对模型关注区域进行可视化分析。【结论】所做研究能够为船舶性能快速预报提供新的思路和方法,也可为后续基于数据驱动的船舶设计研究提供参考。

     

    Abstract: Objectives Currently, approximation techniques have been widely adopted in ship hull optimization design to mitigate the high cost and long cycle times associated with high-precision numerical computations. However, existing approximation models typically rely on predefined parametric modeling methods and manually defined parameters, which makes it difficult to uniformly represent hull geometry and poses challenges for subsequent dataset expansion and the development of general-purpose predictive models. Methods To address these issues, this paper proposes a rapid prediction model for wave resistance coefficients based on graph neural networks, named PB-GraphPR, which takes three-dimensional hull point cloud data as input. Built upon the Dynamic Graph Convolutional Neural Network (DGCNN), the model incorporates a multi-neighborhood parallel feature extraction structure to enable complementary learning and effective integration of local geometric details and global hull line features.Results The results show that the PB-GraphPR model can accurately and rapidly predict the wave resistance coefficient of the Series 60 standard model, achieving a coefficient of determination R2of up to 98.9% on the test set. Conclusions Furthermore, gradient-weighted heatmaps are employed to visualize the regions of focus of the model. This research provides new insights and methods for rapid ship performance prediction and serves as a reference for subsequent data-driven ship design studies.

     

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