基于卷积神经网络和双向长短期记忆的稳定抗噪声滚动轴承故障诊断

doi:10.13229/j.cnki.jdxbgxb20211031

Abstract

Abstract:

Aiming at the problem of low accuracy and unstable performance of the fault diagnosis model of rolling bearing in noise environment conditions， This paper proposes a stable anti?noise fault diagnosis neural network SAFDNN model. The model uses the original vibration data signal as input. First， the CNN is used to extract the characteristics of the data signal， and then the BiLSTM is used to fully extract the sequence characteristics of the data signal， and then the attention mechanism is added for feature fusion and automatically pay attention to the relevant information of each data signal， improving the diagnostic performance of the model， and finally performing feature classification through the fully connected layer and Softmax layer. The experimental results show that SAFDNN can maintain a higher fault recognition accuracy and better stability of the diagnosis effect under the condition of adding additional noise with different signal?to?noise ratios.

Key words: fault diagnosis, stability anti?noise, rolling bearing, neural network, feature extraction, attention mechanism

CLC Number:

TP277

Xiao⁃lei CHEN,Yong⁃feng SUN,Ce LI,Dong⁃mei LIN. Stable anti⁃noise fault diagnosis of rolling bearing based on CNN⁃BiLSTM[J].Journal of Jilin University(Engineering and Technology Edition), 2022, 52(2): 296-309.

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负载	转速/（r·min^-1）	每转采集的数据个数
0.746 kW（1 hp）	1772	406
1.492 kW（2 hp）	1750	411
2.238 kW（3 hp）	1730	416

数据集	位置	Ball			Inner Race			Outer Race			Normal
	标签	0	1	2	3	4	5	6	7	8	9
	直径（inch）	0.007	0.014	0.021	0.007	0.014	0.021	0.007	0.014	0.021	0
A 0.746 kW（1 hp）	训练集	360	360	360	360	360	360	360	360	360	360
	验证集	120	120	120	120	120	120	120	120	120	120
	测试集	120	120	120	120	120	120	120	120	120	120
B 1.492 kW（2 hp）	训练集	360	360	360	360	360	360	360	360	360	360
	验证集	120	120	120	120	120	120	120	120	120	120
	测试集	120	120	120	120	120	120	120	120	120	120
C 2.238 kW（3 hp）	训练集	360	360	360	360	360	360	360	360	360	360
	验证集	120	120	120	120	120	120	120	120	120	120
	测试集	120	120	120	120	120	120	120	120	120	120

编号	网络层	内核大小	步长	神经元数	输出大小
编号	网络层	内核大小	步长	神经元数	输出大小
1	输入层	?	?	?	800×1
2	卷积1	64×1	8	32	100×32
3	池化1	2×1	2	32	50×32
4	卷积2	3×1	1	64	50×64
5	池化2	2×1	2	64	25×64
6	BiLSTM	?	?	32	25×64
7	注意力模块	?	?	100	100×1
8	全连接	?	?	32	32×1
9	Softmax	?	?	10	10×1

batch_size	SNR
batch_size	-10	-8	-6	-4	-2	0	2	4	6	8	10
64	76.57±1.42	84.56±0.89	91.37±0.94	94.44±0.87	96.22±0.47	97.28±0.64	98.23±0.41	98.35±0.31	98.59±0.53	98.59±0.41	98.75±0.38
128	80.18±1.24	85.95±1.67	91.51±0.91	94.83±0.58	96.85±0.66	98.04±0.29	98.42±0.32	98.42±0.27	98.59±0.33	98.71±0.58	98.86±0.36
200	80.36±1.28	87.32±1.04	91.78±0.71	95.36±0.56	97.28±0.41	98.17±0.35	98.75±0.27	99.03±0.21	99.03±0.26	98.66±0.26	99.22±0.29
256	79.84±1.63	86.88±1.97	92.74±0.79	95.81±0.71	97.23±0.53	97.95±0.41	98.11±0.61	98.33±0.64	98.42±0.45	98.65±0.33	98.64±0.36

模型	SNR
模型	-10	-8	-6	-4	-2	0	2	4	6	8	10
SAFDNN	81.89±1.34	86.89±1.08	93.28±0.83	95.52±0.53	97.65±0.37	98.14±0.36	98.55±0.21	98.90±0.19	99.14±0.24	99.44±0.22	99.75±0.15
CNN+BiLSTM	80.35±1.53	85.88±1.08	92.74±0.67	95.28±0.72	96.67±0.57	97.53±0.51	98.43±0.44	98.61±0.43	98.83±0.37	98.97±0.31	99.29±0.20
WDCNN	75.93±2.92	85.75±1.59	91.21±1.43	94.92±0.92	96.57±0.72	97.43±0.71	97.88±0.58	98.01±0.41	98.26±0.61	98.64±0.33	98.86±0.30
TICNN	76.17±3.57	82.08±3.16	89.76±2.98	93.82±1.71	95.08±1.42	96.75±1.29	97.36±1.22	97.61±0.83	98.27±0.63	98.65±0.51	98.88±0.25
CNN+Attention	68.66±1.94	74.52±1.60	79.27±1.88	83.96±1.11	87.57±0.93	90.33±1.28	92.82±0.62	93.69±1.28	95.08±0.51	95.54±0.73	96.47±0.54
AAnNet	59.90±5.53	67.64±4.40	75.71±2.51	81.49±2.94	88.22±2.15	95.44±1.77	96.68±1.43	97.39±0.94	98.33±0.69	98.73±0.75	98.87±0.32

Stable anti⁃noise fault diagnosis of rolling bearing based on CNN⁃BiLSTM

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