Simulation of Wear Fault of Drum Filter Gear Transmission System Based on Rigid-Flexible Coupling

With the increasing demand for digitization in nuclear power plants, establishing gear fault early warning is a crucial aspect of drum filter fault prediction in nuclear power plants. However, It’s important to extract signal characteristics of worn gears is a key step in archining early fault warning for drum filter gears. Traditional methods, involving extensive experiments, encounter challenges of long durations, high expenses, and complexity. The research focuses on the drum filter gear transmission system in certain nuclear power plant, constructing a rigid-flexible coupling model for this system, characterized by its large size, multiple components, and large bearings, to study signal characteristics under different degrees of wear-induced faults. The results show that the value of the RMS of the drive shaft displacement signal exhibits a certain regularity with the average frequency spectrum value at the single mesh gear frequency and the gear wear fault status. Both are dominant features of the wear fault signal. Both are dominant features of wear fault signals. The RMS values of the displacement signals for wear faults at 4 and 8 years increased by 6.2% and 11.6%, while the average frequency domain values at the single gear rotational frequency decreased by 10.7% and 14.2%. The research findings in this paper can provide reference for feature extraction in the fault diagnosis and early warning of drum filter.