基于改进深度残差网络的旋转机械故障诊断

doi:10.12305/j.issn.1001-506X.2022.06.34

Abstract

Abstract:

An improved deep residual network (IDRN) for fault diagnosis of rotating machinery is proposed to solve the problems of fault feature extraction difficulty caused by complex and variable working conditions and insufficient samples of labels. Firstly, one-dimensional vibration signals of rotating machinery are collected for data preprocessing. Then, long short-term memory (LSTM) network is introduced on the basis of the deep residual network, in which the time-series information of faults could be captured effectively.The Dropout layer is introduced into the residual block to improve the accuracy and convergence speed of fault diagnosis. Finally, the validity of the proposed method is verified on the data sets of bearings and gears.Experimental results show that there is no obvious network degradation phenomenon when the proposed method is used to stack multi-layer network models. Compared with several widely used diagnostic methods, the proposed method shows higher average diagnostic accuracy and good applicability.

Key words: fault diagnosis, improved deep residual network (IDRN), long short-term memory (LSTM) network, Dropout layer

CLC Number:

TH17

Zhaoguo HOU, Huawei WANG, Liang ZHOU, Qiang FU. Fault diagnosis of rotating machinery based on improved deep residual network[J]. Systems Engineering and Electronics, 2022, 44(6): 2051-2059.

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References 30

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故障标号	故障直径/(″)	电机负荷/HP	电机转速/rpm	故障位置	样本长度	训练/验证/测试
N	无	0	1 797	无	2 048	700/200/100
F1	0.021	0	1 797	内圈	2 048	700/200/100
F2	0.021	0	1 797	滚珠	2 048	700/200/100
F3	0.021	0	1 797	外圈6点钟	2 048	700/200/100
F4	0.021	0	1 797	外圈3点钟	2 048	700/200/100
F5	0.021	0	1 797	外圈12点钟	2 048	700/200/100

故障标号	故障直径/(″)	电机负荷/HP	电机转速/rpm	故障位置	样本长度	训练/验证/测试
N′	无	0	1 797	无	2 048	700/200/100
F1′	0.007	1	1 772	内圈	2 048	700/200/100
F2′	0.014	2	1 750	滚珠	2 048	700/200/100
F3′	0.021	3	1 730	外圈6点钟	2 048	700/200/100

故障标号	故障类型	电机负荷	样本长度	训练/验证/测试
H	无	20 Hz-0 V	2 048	700/200/100
G1	剥落	20 Hz-0 V	2 048	700/200/100
G2	断齿	20 Hz-0 V	2 048	700/200/100
G3	裂纹	20 Hz-0 V	2 048	700/200/100
G4	磨损	20 Hz-0 V	2 048	700/200/100

模型结构	模型参数	激活函数	输入大小	输出大小
输入层	-	-	(None, 2 048, 1)	(None, 2 048, 1)
卷积层	(32, 3)	ReLU	(None, 2 048, 1)	(None, 2 046, 32)
卷积层	(32, 3)	ReLU	(None, 2 046, 32)	(None, 2 044, 32)
最大池化层	3	-	(None, 2 044, 32)	(None, 681, 32)
LSTM网络层	32	Tanh	(None, 681, 32)	(None, 681, 32)
改进残差块1	(32, 3)	ReLU	(None, 681, 32)	(None, 681, 32)
改进残差块2	(32, 3)	ReLU	(None, 681, 32)	(None, 681, 32)
改进残差块3	(32, 3)	ReLU	(None, 681, 32)	(None, 681, 32)
卷积层	(32, 3)	ReLU	(None, 681, 32)	(None, 679, 32)
全局平均池化层	-	-	(None, 679, 32)	(None, 32)
全连接层	64	ReLU	(None, 32)	(None, 64)
丢弃层	0.25	-	(None, 64)	(None, 64)
分类层	6	Softmax	(None, 64)	(None, 6)

模型	单工况参数设置
BPNN	网络结构为[32,6],训练周期为20,学习率为0.001,优化器采用随机梯度下降
MLP	网络结构为[64,32,16,6],训练周期为20,学习率为0.001,优化器为Adam
SAE	网络结构为[64,32,16,10,16,32,64,6],训练周期为20,学习率为0.001,优化器为Adam
CNN	网络包含3个卷积层,每个卷积层滤波器尺寸分别为[16,32,64],卷积核大小分别为[64,3,3],池化步长为2,训练周期为20,学习率为0.001,优化器为Adam
RNN	网络结构为[32,32,16,32,6],训练周期为20,学习率为0.001,优化器为Adam
DRN	网络结构包含3个残差块,每个残差块包含2个卷积层和1个Dropout层,每个卷积层滤波器尺寸为32,卷积核大小为3,训练周期为20,学习率为0.001,优化器为Adam

Fault diagnosis of rotating machinery based on improved deep residual network

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模型	轴承单工况数据			轴承变工况数据			齿轮数据
模型	训练集	验证集	测试集	训练集	验证集	测试集	训练集	验证集	测试集	测试集平均
BPNN	43.76	41.75	38.16	38.14	30.00	33.00	50.34	38.30	37.00	36.05
MLP	97.21	95.69	96.33	97.61	93.50	94.24	81.89	42.00	40.59	77.05
SAE	97.77	95.92	95.66	96.34	94.50	95.24	79.69	55.70	56.99	82.63
CNN	98.40	97.17	96.60	98.90	98.45	98.23	98.31	87.00	87.59	94.14
RNN	96.00	94.15	93.33	95.00	93.23	94.15	95.43	84.44	85.69	91.05
DRN	98.60	98.25	97.75	98.90	98.54	98.36	97.69	90.50	89.39	95.16
IDRN(本文所提方法)	99.95	99.90	99.80	99.86	99.75	99.69	96.46	91.30	91.00	96.83

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