Locating diagnosis method for malfunctions in outer ring of rolling bearing

Abstract

The invention relates to a locating diagnosis method for malfunctions in an outer ring of a rolling bearing. The method includes the steps that firstly, a non-linear kinetic model of a rolling bearingsystem is created, and according to a second-type Lagrange equation, kinetic differential equations of the bearing system are deducted; secondly, on the basis of the kinetic differential equations ofthe system, vibration acceleration signal is simulated in the horizontal and vertical directions of the bearing system when the bearing system is positioned at different malfunctioned corners; thirdly, according to simulation data, a least square method is adopted for fitting a linear relation expression of the position of the malfunctioned corner at the outer ring and a synchronous root-mean-square value in the horizontal and vertical directions; fourthly, locating diagnosis base data of a bearing system to be diagnosed is measured and obtained, a synchronous root-mean-square value in the horizontal and vertical directions of the locating diagnosis base data is calculated, and therefore the relation expression of the position theta of the malfunction corner at the outer ring of the bearing system to be diagnosed and the synchronous root-mean-square value in the horizontal and vertical directions can be determined; finally, by adopting a position locating law for malfunctioned cornersof outer rings, the position theta d of the malfunctioned corner of the outer ring to be diagnosed is diagnosed. Precise locating diagnosis of the malfunctions in the outer ring of the bearing is achieved, and the method has significant theoretical meaning and application value.

Description

technical field [0001] The invention belongs to the field of fault diagnosis of rolling bearings, and in particular relates to a method for locating and diagnosing faults of outer rings of rolling bearings. Background technique [0002] Rolling bearings are one of the most used parts in rotating machinery and other equipment, and are also the most easily damaged parts. When it fails, it will induce the failure of the whole equipment. Therefore, the research on rolling bearing fault diagnosis is very critical to maintain the normal operation of the equipment. At present, the research on bearing fault diagnosis mainly focuses on the quantitative diagnosis of bearing faults and the identification of bearing fault patterns. There is almost no research on the location and diagnosis of bearing outer ring faults. However, faults at different angular positions may correspond to different causes, such as manufacturing, assembly, and working conditions. In addition, when other facto...

AI Technical Summary

Problems solved by technology

In addition, when other factors are the same, faults at different angular positions may correspond to different remaining lifespans. For example, the closer the angular position of the defect is to the bearing center, the shorter the remaining lifespan of the bearing will be.

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