用神经场建模飞机溅水载荷,支持不同网格配置下的高精度预测。
Conditional Neural Field based Reduced Order Model for Dynamic Ditching Load Prediction

- 采用条件神经场+LSTM,在潜空间实现时空载荷预测。
- 第一数据集误差接近传统卷积模型,参数量减少60%以上。
- 可跨不同网格离散化重建载荷,适合多构型泛化应用。
基于网格的神经网络(如卷积自编码器)广泛应用于计算流体力学的降维代理模型。近年来,基于坐标的条件神经场方法逐渐兴起,其对空间离散化的独立性在计算流体力学中具有优势。本文探讨了利用条件神经场方法对飞机动态溅水载荷进行时空预测。模型在两个数据集上进行了评估:一个为单一固定空间离散化数据,另一个包含不同离散化条件的数据。与潜空间中的长短期记忆网络结合后,神经场模型在第一个数据集上的时空预测精度接近基于网格依赖的卷积自编码器模型,且参数量显著减少。第二个数据集的结果表明,该方法能准确重构异构空间离散化下的溅水载荷,支持针对不同几何形状和/或离散化方式生成的训练数据灵活使用,并可用于不同构型的载荷预测。
原文摘要 · Abstract (English)
Grid-based neural networks such as convolutional autoencoders are widely used in dimension reduction-based surrogate models for computational fluid dynamics. In recent years, the use of coordinate-based approaches like conditional neural fields has emerged. Their independence of the spatial discretization is a beneficial feature for various applications in computational fluid dynamics. This paper discusses the spatio-temporal prediction of aircraft ditching loads using a conditional neural field approach. The model is evaluated using two datasets for the dynamic loads of the fuselage of a DLR-D150 aircraft, one of which relates to a single fixed spatial discretization and the other that includes data from different discretizations. When paired with a long short-term memory (LSTM) network in the latent space, the neural field-based model achieves a spatio-temporal prediction accuracy for the first data set that is close to that of grid-dependent convolutional autoencoder-based models, and with significantly less parameters. Results for the second data set demonstrate the ability of the neural field-based approach to reconstruct ditching loads accurately for heterogeneous spatial discretizations. This allows for flexible use of training datasets generated for different geometries and/or discretizations, as well as the use of the surrogate model to predict loads for different configurations.
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