基于多尺度AlexNet网络的健康因子构建方法

doi:10.3969/j.issn.1001-506X.2020.01.33

Abstract

Abstract:

The monotonicity and trendability of the health indicator constructed by the traditional method is not very ideal. To solve these problems, a bearing health indicator construction method based on multi-scale AlexNet network is proposed. First of all, the original vibrational acceleration signal is transformed to time-frequency map, which is considered as the input of the multi-scale AlexNet network, by continuous wavelet transformation. Then, the health indicator of test bearing is constructed online by the trained multi-scale AlexNet network. Finally, the constructed health indicator is evaluated by metrics, the evaluation results are then used to adjust the network parameters to realize the iterative optimization. The experiment results show that the health indicator constructed by the proposed health indicator construction method has better trendability and monotonicity. In addition, this method does not rely on feature extraction, selection and fusion, which enhances the construction efficiency and generalization.

Key words: bearing health indicator, deep learning, convolutional neural network, evaluation metrics

CLC Number:

TN911.72

Gang ZHANG, Fuqing TIAN, Weige LIANG, Bo SHE. Construction method of bearing health indicator based on multi-scale AlexNet network[J]. Systems Engineering and Electronics, 2020, 42(1): 245-252.

Figures/Tables 12

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References 22

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工况	转速/rpm	载荷/N
1	1 800	4 000
2	1 650	4 200
3	1 500	5 000

数据集	工况1	工况2	工况3
训练集	Bearing1_1	Bearing2_1	Bearing3_1
训练集	Bearing1_2	Bearing2_2	Bearing3_2
测试集	Bearing1_3	Bearing2_3	Bearing3_3
	Bearing1_4	Bearing2_4
	Bearing1_5	Bearing2_5
	Bearing1_6	Bearing2_6
	Bearing1_7	Bearing2_7

网络层	参数
输入层	尺寸:[100×100],通道数:3
卷积层1	卷积核尺寸:[11×11],步长:4,通道数:96
池化层1	卷积核尺寸:[3×3],步长:2,通道数:96
卷积层2	卷积核尺寸:[5×5],步长:1,通道数:256
池化层2	卷积核尺寸:[3×3],步长:2,通道数:256
卷积层3	卷积核尺寸:[3×3],步长:1,通道数:384
卷积层4	卷积核尺寸:[3×3],步长:1,通道数:384
卷积层5	卷积核尺寸:[3×3],步长:1,通道数:256
池化层5	卷积核尺寸:[3×3],步长:2,通道数:256
多尺度展平层	通道数:7 424(6 400+1 024)
全连接层1	通道数:4 096
全连接层2	通道数:1 000
输出层	通道数:1

轴承编号	RMS		PCA		ELM-AE		SDAE-SOM		MULCNN-HI
轴承编号	Tre	Mon	Tre	Mon	Tre	Mon	Tre	Mon	Tre	Mon
1_3	0.77	0.14	0.78	0.15	0.77	0.14	0.67	0.12	0.96	0.83
1_4	0.32	0.16	0.32	0.15	0.31	0.15	0.41	0.17	0.97	0.76
1_5	0.16	0.12	0.23	0.11	0.28	0.12	0.26	0.14	0.91	0.75
1_6	0.10	0.10	0.16	0.11	0.18	0.11	0.31	0.13	0.84	0.43
1_7	0.23	0.11	0.33	0.13	0.34	0.10	0.35	0.14	0.94	0.81

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Construction method of bearing health indicator based on multi-scale AlexNet network

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