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Assessment method for rolling bearing performance variation

A rolling bearing and performance technology, applied in the field of failure analysis and monitoring of rolling bearing performance, can solve problems such as rolling bearing performance variation

Inactive Publication Date: 2011-11-23
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for evaluating the performance variation of rolling bearings, so as to solve the technical problems in the field of real-time evaluation and prediction of the failure degree of rolling bearings

Method used

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  • Assessment method for rolling bearing performance variation
  • Assessment method for rolling bearing performance variation
  • Assessment method for rolling bearing performance variation

Examples

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Embodiment 1

[0149] Example 1: figure 2 , 3 , 4 are part of the time series data of the bearing vibration when the grooves of the inner ring of the rolling bearing in a certain system have wear scar diameters of 0.1778, 0.5334 and 0.7112mm respectively. It can be seen that the larger the diameter of the wear scar, the more severe the vibration of the bearing. Therefore, the wear condition of the internal parts of the bearing can be deduced by analyzing the changes of the vibration information characteristics.

[0150] For the convenience of description, in this embodiment 1, the orange threshold is set u 0 =0.705, red threshold u 1 =0.555. Through this embodiment 1, the specific operation steps and calculation process of the present invention will also be described.

[0151] 1 Obtaining time series of rolling bearing performance

[0152] During the service period of the rolling bearing, the bearing inner ring channel in a certain system wears, and the diameter of the wear scar i...

Embodiment 2

[0165] Example 2 : Similar to Example 1, the optimal fuzzy equivalence relationship measure for other two wear scar diameters can also be calculated u , see Table 1 and Figure 5 , Figure 5 The dashed line part is a smooth extension of the solid line part.

[0166] Depend on Figure 5 The corresponding orange threshold can be obtained u 0 and the red threshold u 1 The wear scar diameters of d 0=0.15mm and d 1 =0.75mm.

[0167] from Figure 2~Figure 5 It can be seen that the wear scar diameter d and the optimal fuzzy relation measure u There is a nonlinear relationship between them, and the wear spot diameter d The larger the value, the optimal fuzzy equivalence relation measure u smaller. This means that as the wear degree of the internal parts of the bearing increases, the time series of the bearing vibration caused by the wear becomes less stable, and the fuzzy equivalence relationship between the phase trajectories in the phase space becomes less close. ...

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Abstract

The invention relates to an assessment method for rolling bearing performance variation. The method comprises the following steps: in a service period of a rolling bearing, collecting data through a measuring system, and obtaining a time sequence of performance of the rolling bearing and dividing the time sequence into subsequences of G time segments evenly; reconstructing phase space of the subsequences of G time segments with a coordinate delay reconstruction method, and obtaining phase loci; establishing fuzzy similarity relations between two random phase loci, obtaining a fuzzy equivalence relation based on the phase space between the two phase loci with a transitive closure method, calculating an optimal fuzzy equivalence relation of G time segments phase loci, and obtaining an optimal fuzzy equivalence relation measurement u of the G time segments phase loci; comparing u with a first threshold u0 and a second threshold u1, and accessing variation state of the rolling bearing performance. According to the invention, abnormity appearance and performance failure degree of the rolling bearing in a service period are effectively assessed in real time in order to adopt corresponding measures timely and avoid generation of major accidents.

Description

technical field [0001] The invention belongs to the technical field of failure analysis and monitoring of rolling bearing performance, and relates to an evaluation method for performance variation of rolling bearings of service devices. Background technique [0002] For a long time, the performance evaluation of rolling bearings mainly involves the statistical analysis of fatigue life and reliability, and the Weibull distribution is the basic assumption. With the rapid development of aerospace, aviation, new energy, new materials, quiet equipment, high-speed and heavy-duty transportation and other fields, new proposals are made for the performance of rolling bearing friction, wear, vibration, temperature rise and motion accuracy, as well as its life and reliability. The reason is that many bearing failures are not fatigue spalling, but the internal parts are stuck, sintered, worn, plastically deformed, cracked or broken before fatigue. [0003] The failure of rolling bearin...

Claims

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Application Information

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IPC IPC(8): G01M13/04
Inventor 夏新涛陈龙孙小超樊雎高磊磊尹保健
Owner HENAN UNIV OF SCI & TECH
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