The invention discloses an electromagnetic bearing fault mode
analysis method for fault diagnosis of a primary
helium fan. The method comprises the following steps: establishing an electromagnetic bearing-rotor-rack high-fidelity
coupling dynamic model; extracting fault feature frequency and
vibration amplitude, preprocessing the monitoring
signal, and extracting multi-source heterogeneous fault features; evaluating the sensitivity of each feature to a fault, designing an adaptive weighted D-S evidence theory fusion
algorithm, and identifying a bearing fault mode by dynamically adjusting the weight of an information source; building a
convolutional neural network model to automatically extract deep fault features corresponding to the working conditions, and performing diagnosis model
adaptation among different working conditions by adopting a transfer learning strategy; the GRU network is used for training and learning
time sequence monitoring data, the development trend of bearing faults is predicted, and a
heuristic algorithm is used for optimizing a fan operation and
maintenance strategy. According to the method, the limitation of the existing method can be overcome, accurate diagnosis and
trend prediction of the bearing fault are realized, and key
technical support is provided for intelligent operation and maintenance of the rotating machinery.