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Measurement of Defects in Car Bearings and Its Effect on Ultrasonic Waves

Esmaeil Mirmahdi, Mohammad Nazemi, Hossein Mohammadi, Ali Maroufi, Mohammad Hashemipour


As one of the defects of roller bearings due to intermittent coupling forces and external impact loads,
surface cracks due to corrosion or wear may have many defects for rotating machines. Surface
cracking on the bearing or its ball is one of the important factors in the efficiency of the bearing and
its opening. It is useful to study these cracks and identify the type and size of these cracks for bearings
used in automobiles and industry. Ultrasound tests were used to obtain the amount and type of
cracking in this experiment. Ultrasound test determines the size of this crack for us in experimental
work. This crack was on the surface of the outer shell of the bearing as well as the ball. Multiphysics
COMSOL software was used to equate an equation to arrive at a wave indicating a defect. The
scanning system is also used for experimental testing. The probes have a frequency of 15 MHz. Defect
modeling is performed on the bearing and the ball bearing part, which in COMSOL is the time-based
arrival of signals, both in simulations and in experimental testing. It is quite useful to check the
displacement in the time domain to detect the defect, which is used when moving the bearing that has
a crack defect so that the location of the crack is completely recognizable in its size. In this test, the
time of occurrence of the defect is also discussed. Experimental work has also been done to validate
the results. The time results in both experimental and simulation tests show that the error is low and
the error rate in the time domain will reach less than 0.3 seconds. To reduce the error, all the steps of
securing the part and placing the probe were well observed. Differences in bearings and measuring
points were performed on the outer wall of the cylindrical bearing with two items to detect cracks.
Roller without surface cracking and roller with surface cracking which helps a lot in how to better
find and detect the location of cracking.


Bearing, crack, defect, external, ultrasonic testing

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