Experimental Investigation of Bearing Inner and Outer Wall Defects by Ultrasonic Waves

Abstract

Sometimes the bearings show their defects by exchanging between the network gears, and this can be useful for experimental and similar experiments. These defects will cause the bearing to malfunction, the bearing to malfunction and need to be repaired and maintained, which can be useful for the industry and save potential costs. These defects can be significant through ultrasound to combine time and frequency variables, which is addressed in this article. The role of ultrasound is very important in examining defects. Modeling and simulation signals were performed using COMSOL Multiphysics software. To simulate this, the entire gear system and shaft in the bearings must be modeled. In this modeling, only a symmetry of a bearing with two defects was considered, which is a new method. The nonlinear stiffness model in the gear model was selected for this test. The bearing model is based on Hertzian contact theory, which is related to the displacement of the bearing to the bearing load as well as the slip between the components. Defect modeling was performed once for the inner wall and again for the outer wall. When the signals collided with the defects, the size of the defects could be identified by which this defect could be examined. Ultrasound signals were simulated for local defects and subjected to similar diagnostic techniques in experimental experiments (acceleration signals). Simulation results and experimental results showed a similar pattern that was observed at the measured points. These results were in line with the fact that the error rate between the experimental test and the simulation is very small, which shows the accuracy of the experiment.