MVB fault diagnosis based on time-frequency analysis and convolutional neural networks.

Traditional diagnostic methods for multifunction vehicle bus (MVB) faults often depend on feature extraction and classification, which typically require substantial expert experience and frequently yield low accuracy. To address this limitation, this paper introduces a MVB fault diagnosis method utilizing convolutional neural networks (CNNs). Initially, the method employs short-time Fourier transform (STFT) to convert the original vibration signals of MVB under various fault conditions into time-frequency images. Subsequently, a specific MVB fault diagnosis model, termed STCNN, is developed to conduct deep spatial feature learning on these two-dimensional signals. Fault classification is then achieved through a Softmax classifier. The model was tested on a MVB network dataset collected under diverse operating conditions on a test bench. The results demonstrated a fault detection accuracy of 99.68%, significantly surpassing other methods and highlighting its superior performance in fault diagnosis.