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摘要:
针对辅助分类器生成对抗网络(ACGAN)在小样本齿轮箱故障诊断过程中,生成故障样本缺乏多样性,且质量较差,导致诊断准确度不高的问题,提出一种基于自校正辅助分类器生成对抗网络(SCACGAN)的齿轮箱故障诊断方法。在辅助分类器生成对抗网络中引入一个独立的分类器,改善判别器输出错误对生成样本质量造成的不良影响,并对不同齿轮箱样本的健康状况进行分类;采用最小二乘函数,提高模型的生成能力和分类能力,改善训练过程中生成样本质量不高的问题;在生成器中引入自校正卷积神经网络,增强故障特征获取的能力。实验结果表明:在小样本条件下,所提方法能够生成质量较好的故障样本,从而提高了齿轮箱的故障诊断准确度。
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关键词:
- 齿轮箱 /
- 小样本 /
- 辅助分类器生成对抗网络 /
- 自校正卷积神经网络 /
- 故障诊断
Abstract:A new method for gearbox fault diagnosis based on the self-correcting auxiliary classifier generative adversarial networks (SCACGAN) is suggested in response to the limited diversity and low quality of fault samples produced by the auxiliary classifier generative adversarial networks (ACGAN) during the small-sample gearbox fault diagnosis process, which subsequently results in low diagnostic accuracy. Firstly, an independent classifier is introduced into the auxiliary classifier generative adversarial network to mitigate the adverse impact of discriminator output errors on the quality of generated samples, and to classify the health status of different gearbox samples. Secondly, the problem of low-quality generated samples during the training phase is addressed by using the least squares function to improve the model’s generation and classification skills. Lastly, a self-correcting convolutional neural network is integrated into the generator to enhance the capability of fault feature acquisition. Experimental results demonstrate that under small-sample conditions, the proposed approach is capable of generating higher-quality fault samples, thereby improving the accuracy of gearbox fault diagnosis.
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表 1 SCACGAN的生成器结构参数
Table 1. Generator structural parameters of SCACGAN
网络层 结构参数 H×W×N Dense 2 048 2×2×512 Conv1 (128,5,2) 4×4×128 Conv2 (64,5,2) 8×8×64 SCConv (32,5)(经过K1) 8×8×64 (32,5) (经过K2) (32,5) (经过K3) (32,5)(经过K4) Conv3 (8,5,2) 16×16×8 Conv4 (1,3,2) 32×32×1 表 2 SCACGAN的判别器和分类器结构参数
Table 2. Discriminator and classifier structural parameters of SCACGAN
模型 网络层 结构参数 输出尺寸 判别器 Conv1 (16,5,2) 16×16×16 Conv2 (32,3,2) 8×8×32 Conv3 (64,3,2) 4×4×64 Conv4 (128,3,2) 2×2×128 Conv5 (256,3,1) 2×2×256 Dense 1 1 分类器 Conv1 (16,3,2) 16×16×16 Conv2 (32,3,2) 8×8×32 Conv3 (64,3,2) 4×4×64 Conv4 (128,3,2) 2×2×128 Conv5 (256,3,1) 2×2×256 Dense 256 256 Dense 128 128 Dense 9 9 表 3 齿轮样品详情
Table 3. Gear sample details
齿轮的健康状态 分类标签 健康 0 缺齿 1 齿根裂纹 2 剥落 3 碎屑尖端1 4 碎屑尖端2 5 碎屑尖端3 6 碎屑尖端4 7 碎屑尖端5 8 -
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