Intelligent Fault Diagnosis of Variable-Condition Motors Using a Dual-Mode Fusion Attention Residual

Abstract

Electric motors play a crucial role in ship systems. Detecting potential issues with electric motors is a critical aspect of ship fault diagnosis. Fault diagnosis in motors is often challenging due to limited and noisy vibration signals. Existing deep learning methods struggle to extract the underlying correlation between samples while being susceptible to noise interference during the feature extraction process. To overcome these issues, this study proposes an intelligent bimodal fusion attention residual model. Firstly, the vibration signal to be encoded undergoes demodulation and is divided into high and low frequencies using the IEEMD (Improved Ensemble Empirical Mode Decomposition) composed of the EEMD (Ensemble Empirical Mode Decomposition) and the MASM (the Mean of the Standardized Accumulated Modes). Subsequently, the high-frequency component is effectively denoised using the wavelet packet threshold method. Secondly, current data and vibration signals are transformed into two-dimensional images using the Gramian Angular Summation Field (GASF) and aggregated into a bimodal Gramian Angle Field diagram. Finally, the proposed model incorporates the Self-Attention Squeeze-and-Excitation Networks (SE) mechanism with the Swish activation function and utilizes the ResNeXt architecture with a Dropout layer to identify and diagnose faults in the multi-mode fusion dataset of motors under various working conditions. Based on the experimental results, a comprehensive discussion and analysis were conducted to evaluate the performance of the proposed intelligent bimodal fusion attention residual model. The results demonstrated that, in comparison to traditional methods and other deep learning models, the proposed model effectively utilized multimodal data, thereby enhancing the accuracy and robustness of fault diagnosis. The introduction of attention mechanisms and residual learning enable the model to focus more effectively on crucial modal data and learn the correlations between modalities, thus improving the overall performance of fault diagnosis.

Semi-supervised image classification algorithm based on double threshold FixMatch

“…The proposed DT-FixMatch framework utilizes the ResNeXt-50 [10] backbone network to extract image features. For the ship image classification task, ResNeXt-50 receives a 224×224 image as input.…”

“…𝐹1 𝑆𝑐𝑜𝑟𝑒 2 (10) where 𝑇 is the number of samples where the model predicts positive and is actually positive; 𝐹 is the number of samples where the model predicts positive and is actually negative; 𝐹 is the number of samples where the model predicts negative and is actually positive; and 𝑇 is the number of samples where the model predicts negative and is actually negative.…”

A Novel Multi–Scale One–Dimensional Convolutional Neural Network for Intelligent Fault Diagnosis of Centrifugal Pumps

“…Moreover, visual inspection is only suitable for small pump structures, and its diagnostic efficiency for complex structures is low. To address the limitations of visual inspection, extensive research has been conducted, resulting in the development of advanced fault-diagnosis methods [5]. Among these methods, utilizing mechanical vibration data and data analysis for fault diagnosis demonstrates robustness and promising prospects.…”