Taehun Kim , Jin Uk Ko , Jinwook Lee , Yong Chae Kim , Joon Ha Jung , Byeng D. Youn
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引用次数: 0
摘要
在旋转机械故障诊断领域,由于可用的故障数据有限,许多研究都采用了生成式对抗网络(GAN)来生成数据。然而,用于训练 GAN 的故障数据有限,这加剧了 GAN 固有的训练不稳定性和模式崩溃问题,而这些问题都是由对抗训练引起的。此外,用于潜在向量采样的随机采样的随机性往往导致生成的数据保真度低、多样性差,从而对故障诊断模型产生负面影响。为了解决这些问题,本文提出了两种新方法:频谱引导 GAN(SGAN)和密度定向采样(DDS)。SGAN 通过组合数据利用、对抗性频谱损失和定制的模型结构来缓解训练不稳定性和模式崩溃。DDS 通过两个步骤对潜在向量进行选择性采样,确保生成数据的高保真和高多样性:在特征空间中进行基于密度的过滤和基于方向性的采样。转子和滚动轴承数据集的验证结果表明,在故障数据有限的情况下,SGAN-DDS 能显著改善分类结果。此外,还进行了保真度和多样性分析来验证 DDS,从而提高了所提方法的可信度,并推动了深度学习和 GAN 在工业领域的应用。
Spectrum-guided GAN with density-directionality sampling: Diverse high-fidelity signal generation for fault diagnosis of rotating machinery
In the field of fault diagnosis for rotating machinery, where available fault data are limited, numerous studies have employed a generative adversarial network (GAN) for data generation. However, the limited fault data for training GAN exacerbate GAN’s inherent training instability and mode collapse issues, which are induced by adversarial training. Moreover, the stochastic nature of random sampling for latent vectors sampling often results in low-fidelity and poor diversity generation, which negatively affects the fault diagnosis models. To address these issues, this paper presents two novel approaches: a spectrum-guided GAN (SGAN) and density-directionality sampling (DDS). SGAN mitigates training instability and mode collapse through combinatorial data utilization, adversarial spectral loss, and a tailored model structure. DDS ensures the high-fidelity and high-diversity of the generated data by selectively sampling the latent vectors through two steps: density-based filtering and directionality-based sampling in the feature space. Validation on both rotor and rolling element bearing datasets demonstrates that SGAN-DDS considerably improves classification results under the limited fault data. Furthermore, fidelity and diversity analyses are conducted to validate DDS, which increase the credibility of the proposed method; and offer advancement toward the application of deep-learning and GAN in industrial fields.
期刊介绍:
Advanced Engineering Informatics is an international Journal that solicits research papers with an emphasis on 'knowledge' and 'engineering applications'. The Journal seeks original papers that report progress in applying methods of engineering informatics. These papers should have engineering relevance and help provide a scientific base for more reliable, spontaneous, and creative engineering decision-making. Additionally, papers should demonstrate the science of supporting knowledge-intensive engineering tasks and validate the generality, power, and scalability of new methods through rigorous evaluation, preferably both qualitatively and quantitatively. Abstracting and indexing for Advanced Engineering Informatics include Science Citation Index Expanded, Scopus and INSPEC.