Rolling bearing outer ring defect full-size quantitative diagnosis method

Abstract

The invention discloses a rolling bearing outer ring defect full-size quantitative diagnosis method. Firstly primary diagnosis is performed on an actual measurement signal based on an impact time difference to obtain a basic size and selectable sizes of an outer ring defect. Secondly a nonlinear dynamics model of a bearing system is built, and through numerical solving, a vertical-horizontal synchronous simulation vibration signal corresponding to each defect size is obtained. For the situation that a defect angle is 270 degrees, Fourier transform is performed on the actual measurement signaland a simulation signal of each selectable defect size to obtain corresponding amplitude spectrums, a minimum diagnosis parameter Min / delta fN / of the actual measurement signal is solved, and an outerring defect size is diagnosed out. For the situation that the defect angle is 250-290 degrees, an outer ring defect full-size quantitative diagnosis standard database is established based on a vertical-horizontal synchronous standard deviation, and by determining an attribution interval of the vertical-horizontal synchronous standard deviation of the actual measurement signal, the outer ring defect size is diagnosed out.

Description

technical field [0001] The invention discloses a full-scale quantitative diagnosis method for defects in the outer ring of a rolling bearing, which belongs to the technical field of bearing fault diagnosis. Background technique [0002] Rolling bearings are the most widely used components in various mechanical equipment, and whether their operating status is good or not will directly affect the safe operation of the entire equipment. According to relevant statistics, about 30% of rotating machinery failures are caused by bearing failures, and about 90% of rolling bearing failures are caused by outer and inner ring failures. Therefore, it is of great significance to study bearing fault diagnosis technology to find faults as early as possible, avoid catastrophic accidents, and ensure the normal, safe and orderly operation of equipment. [0003] At present, the quantitative diagnosis method of bearing fault is mainly to estimate the defect size through the double impact differ...

AI Technical Summary

Problems solved by technology

However, as the faulty bearing continues to operate, the size of the defect will continue to expand. When the size of the defect is larger than the angular pitch of the balls, that is, a large defect, the size of the defect with a difference of n times the angular pitch of the balls has the same impact time difference.

In this case, only using the impact time difference method to diagnose the size of the defect will easily confuse these defects, resulting in misdiagnosing large defects as small defects, or misdiagnosing small defects as large defects, making the final diagnosis result inaccurate reliable

It is the goal of some industries to be able to distinguish the size of these defects, such as the railway industry. In order to make full use of bearings and ensure safety, once a small defect occurs in the bearing, it will not be replaced immediately, but will gradually expand with the defect until the defect reaches a certain size. Dimensions are usually larger than the ball angular pitch; in this case, the impact time difference technique will not be able to correctly diagnose the outer ring defect size

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