Using Multi-dimensional Features of Structure to Construct Graph Convolutional Neural Network for Structural Damage Identification
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摘要:
以数据为驱动的深度学习结构损伤识别(structural damage identification,SDI)效果受结构复杂程度、模型构建方法及数据规模等因素影响较大.本文引入图卷积神经网络(graph convolutional neural network,GCN)以整合结构节点间的属性特征,从图的视角挖掘节点间的复杂属性关系,为SDI提供多维度学习信息.为此,设计了一种融合结构多维特征的图卷积神经网络模型(graph convolutional neural network integrating multi-dimensional features of structure,S-GCN),基于结构振动数据构造损伤特征矩阵,并通过衍生图网络,以图的节点和边表征结构节点的连接关系,构建边索引矩阵,将结构损伤状态、振动数据及节点属性等多维特征信息输入GCN进行结构损伤特征提取及预测识别,探索结构多维特征信息驱动下的GCN在损伤预测中的应用效果.通过两个钢结构验证方法的可行性及有效性,结果表明,S-GCN能够整合结构多维特征信息,对两个结构对象均实现了较高的损伤预测准确性,并展现出良好的噪声鲁棒性.进一步的对比分析显示,相较于三种非GCN模型,S-GCN能够高效地依托节点间关系快速更新节点特征并预测节点损伤状态,其损伤识别准确率、计算效率及网络各层演进过程均优于对比模型,验证了在结构损伤识别中融合结构空间特征的有效性.
Abstract:
The effect of data-driven deep learning structural damage identification (SDI) is greatly affected by factors such as structural complexity, model construction method and data size, etc. We introduce graph convolutional neural network (GCN) to integrate the attribute features between structural nodes, explore the complex attribute relationships between nodes from a graph perspective, and provide multi-dimensional learning information for SDI. To this end, a graph convolutional neural network integrating multi-dimensional features of structure (S-GCN) model was designed, which integrates multidimensional structural features. Based on structural vibration data, a damage feature matrix was constructed, and through a derived graph network, the connection relationship between nodes and edges in the graph was represented. An edge index matrix was constructed, and multidimensional feature information such as structural damage status, vibration data, and node attributes was input into GCN for structural damage feature extraction and identification. The application effect of GCN in damage identification driven by multidimensional structural feature information was explored. The feasibility and effectiveness of two steel structure verification methods were verified, and the results showed that S-GCN can integrate multi-dimensional structural feature information, achieve high damage identification accuracy for both structural objects, and demonstrate good noise robustness. Further comparative analysis shows that S-GCN can efficiently update node features and predict node damage status based on inter-node relationships compared with the three non-GCN models. Its damage recognition accuracy, computational efficiency, and network layer evolution process are all better than the comparative models, verifying the effectiveness of integrating structural spatial features in structural damage recognition.