Modeling and Effect of Ultrasonic Waves on Bearing Shells in Industry by Non-Destructive Testing

Abstract

Defect of roller bearings shell may have many defects for rotary machines due to alternative connection forces and external impact loads, such as surface cracks fault results from corrosion or wear. Investigating the methods of detecting surface cracking defects for roller bearings shell is very useful for maintaining these machines. The new faults detection method was based on sent signals by amplitude and frequency by a multi-probe (FDDP) device due to influence of different frequency spectrum in order to detect surface cracking fault in the outer wall of the roller bearings shell. The finite element model was obtained for the shell of roller bearings by simulating the surface cracking defect in its outer wall and then by new method to use various probes for measure in the frequency domain of high detection fault cracking echoes. Differences in amplitude and signal received from the flawless bearing shell with surface cracking defects have been investigated and it used to detect the position of the surface cracking defect in the outer bearing wall. Experimental and simulation results indicated that the differences between the previous method and the new method for measuring the surface cracking defect in the outer wall of the roller bearing shell by using the new method of more probes with different frequencies (FDDP) simultaneously and without the time delay can be used to detect the location of the crack fault and its size more quickly and reliably. High and low frequencies are sensitive to the effects of ultrasonic waves, which do not react naturally at low frequencies such as speed, and low speeds cause structural vibration, but at high frequencies, these defects will be clearly visible and less vibration. Ultrasound is an optional method for non-destructive testing by which defective echoes are detected by using normal probe by ultrasonic immersion. Experimental and simulation results indicated that the study of all previous cases for surface cracking defects of shell has less efficient than the discovery of the new current method in which the detection of defect size was clearly shown for 5 different states.