چكيده به لاتين
The purpose of this study is to design and test a status monitoring system to detect two defects of oil whirl instability and overheating in the hydrodynamic journal bearing using multi-sensor information fusion. For this purpose, first, the effect of temperature on system parameters (stiffness, dumping, etc.) has been investigated, then these effects have been simulated for the system in Camsol software and also the stability threshold of the system has been extracted through theory. After observing the effects of heat on the instability threshold of the system, the test system is designed for a more detailed investigation. In this system, two sensors of the proximity probe and load cell are used and information related to each sensor is collected. Because the purpose is to investigate the simultaneous effect of two faults and the effects of temperature are also considered, the test steps are performed at three different and constant temperatures. After collecting information, the data analysis step was performed for three possible cases, including oil whirl instability fault, overheating fault, and both faults simultaneously, and the ability of each sensor to detect these faults were evaluated, and the monitoring system is presented based on the information fusion of the available sensors. Finally, it is concluded that considering pressure changes alone can lead to erroneous reporting of any oil whirl defects and overheating because other factors such as load changes, looseness, and other defects can change the pressure distribution. Therefore, it is recommended that the pressure changes measured under the bearing together with the displacement signals measured together during a calibration process and the combination of information in the final decision to announce the occurrence of any defects in oil whirl instability or oil temperature increase. Use bearings that cause the bearings to burn.
