A Lightweight Convolutional Neural Network for Guided Wave Based Damage Detection in Composite Structures
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摘要: 针对有限计算资源下复合材料的实时监测问题,该文提出了基于超声导波和轻量化卷积神经网络(one-dimension convolutional neural network-deformable convolution attention,CDCA)的损伤实时识别方法. 在该方法中,为了压缩多个路径的导波信号,首先提出了改进差分驱动的平均聚合(improved differential-driven piecewise aggregate approximation,IDPAA)算法,利用该方法可以显著减少计算量;其次,提出了轻量化可变形卷积注意力(deformable convolution attention,DCA)机制,让模型聚焦在与损伤相关的像素级特征,从而实现更高效、准确的结构损伤识别;最后,通过结合一维卷积神经网络(one-dimension convolutional neural network,1D-CNN)和DCA机制,构建了CDCA模型. 该模型不仅可以在有限资源环境下运行,还能实现含噪声工况下的损伤实时识别. 在真实数据集上验证了所提出方法的有效性. 试验结果表明,所提出的损伤识别方法有较高的损伤识别准确性,准确率可达98%,并且大幅提高了模型计算效率,相较于其他先进深度学习模型具有显著的优势.Abstract: For real-time monitoring composite structures under limited resource conditions, a machine learning-assisted method based on ultrasonic guided waves was proposed for real-time damage detection. In the proposed method, firstly, an improved differential-driven piecewise aggregate approximation (IDPAA) algorithm was designed to compress multi-path guided wave signals, thereby greatly reducing computational requirements. Secondly, a novel lightweight deformable convolution attention (DCA) mechanism was developed, which can help model focus on pixel-level feature information related to damage, enabling more efficient and accurate structural damage detection. Finally, by integrating a one-dimension CNN (1D CNN) with the designed DCA mechanism, a lightweight 1D-CNN-DCA (CDCA) model was proposed, which not only can work under the limited resource conditions but also can effectively real-time monitor structural damages under noise environments. The experiment of the proposed damage detection method on real-world datasets demonstrates its effectiveness, where the results reveal that it can reach 98% accuracy and significantly improves computation efficiency, outperforming other advanced monitoring approaches.
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表 1 模型参数量,计算复杂度对比表
Table 1. Comparison of the model parameters and the computational complexities
model number of parameters FLOPs CDCA 0.17M 7.2M ResNet 18(1D-CNN) 3.9M 175M CNN-LSTM 0.43M 139M multi-scale 1D-CNN 8.6M 51M -
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