Improved Deep Convolutional Neural Network with Applications to Bearing Fault Diagnosis Under Variable Conditions

doi:10.7652/xjtuxb202106001

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Improved Deep Convolutional Neural Network with Applications to Bearing Fault Diagnosis Under Variable Conditions

更新时间：2025-07-09

- Improved Deep Convolutional Neural Network with Applications to Bearing Fault Diagnosis Under Variable Conditions
- Vol. 55, Issue 6, Pages: 1-8(2021)
- 作者机构：
  
  西安交通大学机械制造系统工程国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202106001
  CLC： TH17
- Online First：10 June 2021，
  
  Published：2021
- 稿件说明：
移动端阅览
Improved Deep Convolutional Neural Network with Applications to Bearing Fault Diagnosis Under Variable Conditions[J]. 2021, 55(6): 1-8.
DOI：

Improved Deep Convolutional Neural Network with Applications to Bearing Fault Diagnosis Under Variable Conditions[J]. 2021, 55(6): 1-8. DOI： 10.7652/xjtuxb202106001.

摘要

为了解决目前常用的最大池化丢失大量信息和平均池化模糊重要特征的问题

提出了一种小尺度卷积核以跳动的方式进行降采样的方法。该方法用步长为2、激活函数为Rectified Linear Unit(ReLU)的小尺度卷积层代替传统的池化层

既可以使输出图像的尺寸变成输入的一半

实现降采样的功能

又能让小尺度卷积核在训练中自动调整权重挑选有效的特征。与最大池化相比

该方法可有效地提高神经元激活比例并增加神经元活性值的多样性。综合采用提出的池化方法、深度可分离卷积核和全局平均池化层3个策略改进的深度卷积神经网络

在实验室变转速多滚动轴承数据集上进行测试

结果表明

改进后的网络识别正确率达到98.4%

高于作为对比的其他网络

同时还大幅提高了网络的稳定性

减少了40%以上的训练时间。提出的方法可以为科研技术人员在搭建深度卷积神经网络和变工况滚动轴承故障诊断时提供参考。

Abstract

The commonly used max pooling only takes the maximum value of neuron activity in the region to bring about loss of a large amount of information

and the average pooling assigns the same weight to the neuron activity values to weaken important features. A novel strategy for down sampling with small-scale convolution kernels is proposed. This strategy replaces the traditional pooling layers with small-scale convolution layers

where the stride of convolution kernels is 2 and the activation function is chosen as Rectified Linear Unit(ReLU)

thus the size of the output image only gets half of the input to achieve down sampling and the small-scale kernels can automatically adjust the weight to select effective features during training. Compared with max pooling

the ratio of active neuron and the diversity of neuron activity values are more effectively heightened. The improved deep convolution neural network(DCNN)with the proposed strategy

depth wise separable convolution and global average pooling is tested and compared on a variable-speed and multi-rolling bearings dataset. The results show that the improved DCNN recognition accuracy rate reaches 98.4%

higher than the other competing networks. Meanwhile

the stability of network is greatly enhanced and training time is shortened by 40%. The proposed strategy for down sampling with small-scale convolution kernels may provide a reference to construction of DCNN and fault diagnosis of rolling bearings under variable conditions.

关键词

Keywords

references

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