Abstract
Data-driven methods with multi-sensor time series data are the most promising approaches for monitoring machine health. Extracting fault-sensitive features from multi-sensor time series is a daunting task for both traditional data-driven methods and current deep learning models. A novel hybrid end-to-end deep learning framework named Time-distributed ConvLSTM model (TDConvLSTM) is proposed in the paper for machine health monitoring, which works directly on raw multi-sensor time series. In TDConvLSTM, the normalized multi-sensor data is first segmented into a collection of subsequences by a sliding window along the temporal dimension. Time-distributed local feature extractors are simultaneously applied to each subsequence to extract local spatiotemporal features. Then a holistic ConvLSTM layer is designed to extract holistic spatiotemporal features between subsequences. At last, a fully-connected layer and a supervised learning layer are stacked on the top of the model to obtain the target. TDConvLSTM can extract spatiotemporal features on different time scales without any handcrafted feature engineering. The proposed model can achieve better performance in both time series classification tasks and regression prediction tasks than some state-of-the-art models, which has been verified in the gearbox fault diagnosis experiment and the tool wear prediction experiment.
Highlights
Accurate and real-time monitoring of machine health status has great significance
The TDConvLSTM model has been proposed in this paper to extract spatiotemporal features multi-sensor time series for machine health monitoring
The TDConvLSTM model is suitable for raw of multi-sensor time series for machine health monitoring
Summary
Accurate and real-time monitoring of machine health status has great significance. Machine health monitoring (MHM) is of great significance to ensure the safety and reliability of equipment operation. The features of the signal to be processed vary with different devices, different operating conditions and different fault conditions [1]. It puts forward higher requirements for the accuracy, efficiency and versatility of condition monitoring and fault diagnosis methods. Compared with traditional fully-connected layers, the convolutional layer can reduce model parameters and improve model calculation speed, which is more suitable for directly processing complex input data and extracting local features
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