Investigating Noise Reduction in Signal Analysis in Rotary Machines Fault Diagnosing by Neural Network

Document Type : Research Article

Authors

1 Faculty of Mechanical Engineering, Guilan University, Rasht, Iran

2 Faculty of Mechanical Engineering, University of Guilan

Abstract

Fault diagnosis of mechanical systems is of special importance for better system performance as well as its protection. In this work, a rotary machine laboratory system is used to generate signals. The obtained data are placed in the pre-processing process. In this article, to improve the performance of signal analysis, the combined analysis methods using signal features and Kalman filter are proposed. First, the Kalman filter is used to reduce the signal noise. In the following, for signal pre-processing, the features of the signal in the time domain and frequency domain are suggested, which have been used as one-dimensional signal pre-processing. In the following, several neural networks such as support vector machine, multilayer perceptron, and convolutional neural networks have been used to analyze the obtained features. To check the results, the data is divided into training data and validation data. Accuracy results for validation data are examined in different methods. The results indicate the better performance of the AlexNet convolutional neural network in the presence of the Kalman filter noise reduction. In this case, this network has reached an average of 96.1% accuracy for validation data, which has been improved compared to other classifiers and fault diagnosis without noise reduction.

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Main Subjects


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