CN113536486B - Bearing slip state evaluation method - Google Patents
Bearing slip state evaluation method Download PDFInfo
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- CN113536486B CN113536486B CN202110852645.8A CN202110852645A CN113536486B CN 113536486 B CN113536486 B CN 113536486B CN 202110852645 A CN202110852645 A CN 202110852645A CN 113536486 B CN113536486 B CN 113536486B
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- bearing
- speed
- slip
- retainer
- inner ring
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention discloses a method for evaluating a bearing slip state, which comprises the following steps: s1, determining the rotating speed of an inner ring of a bearing; s2, determining the actual speed of the bearing retainer; s3, calculating the sliding speed of the retainer according to the rotating speed of the inner ring of the bearing and the actual speed of the bearing retainer; s4, calculating the sliding degree of the bearing according to the sliding speed of the retainer and the rotating speed of the inner ring of the bearing; s5, judging whether the slip degree is larger than a set threshold value, if so, enabling the bearing to have slip faults; if not, the bearing has no slip fault. The method for evaluating the bearing slip state can evaluate the bearing slip state simply and effectively, and has high reliability and strong applicability.
Description
Technical Field
The invention relates to the field of bearings, in particular to a method for evaluating a sliding state of a bearing.
Background
In an ideal operating state, the rolling bearing has a circularly symmetrical rolling structure. In practice, however, centrifugal forces, surface errors of the bearing components, etc. can deviate the movement of the rollers from ideal. If the rollers contact the outer race of the rolling bearing, the rollers may slide along the inner race of the outer race of the rolling bearing, thereby reducing bearing life. Therefore, it is important to develop a method of assessing the slip condition of a bearing.
Disclosure of Invention
In view of the above, the invention aims to overcome the defects in the prior art, and provides a method for evaluating the bearing slip state, which can evaluate the bearing slip state simply and effectively, and has high reliability and strong applicability.
The method for evaluating the bearing slip state comprises the following steps:
s1, determining the rotating speed of an inner ring of a bearing;
s2, determining the actual speed of the bearing retainer;
s3, calculating the sliding speed of the retainer according to the rotating speed of the inner ring of the bearing and the actual speed of the bearing retainer;
s4, calculating the sliding degree of the bearing according to the sliding speed of the retainer and the rotating speed of the inner ring of the bearing;
s5, judging whether the slip degree is larger than a set threshold value, if so, enabling the bearing to have slip faults; if not, the bearing has no slip fault.
Further, the bearing inner race rotational speed v is determined according to the following formula:
wherein f is the pulse frequency of the magnetic field where the bearing inner ring is positioned.
Further, the actual speed v of the bearing cage is determined according to the following formula c ：
Wherein n is the number of magnets circumferentially and uniformly arranged on the retainer; f (f) c The pulse frequency of the magnetic field in which the retainer is positioned.
Further, the slip speed v of the cage is determined according to the following formula h ：
Wherein v is h1 A first slip speed for the cage; v h2 A second slip speed for the cage; the first sliding speed and the second sliding speed are both differences between the actual speed of the bearing retainer and the theoretical speed of the bearing retainer; wherein the speed of the inner ring of the bearing is taken as the theoretical speed of the bearing retainer。
Further, the slip degree S of the bearing is determined according to the following formula:
wherein a is h For the sliding speed v of the cage h Corresponding acceleration; k (k) 1 、k 2 K 3 Are slip coefficients.
The beneficial effects of the invention are as follows: according to the method for evaluating the bearing slip state, disclosed by the invention, the slip degree of the bearing is calculated by measuring and calculating the rotating speed of the inner ring of the bearing and the actual speed of the bearing retainer, and the slip degree of the bearing is compared with the set threshold value, so that the bearing slip resistance and the current slip state are evaluated.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings, as shown in fig. 1:
the method for evaluating the bearing slip state comprises the following steps:
s1, determining the rotating speed of an inner ring of a bearing;
s2, determining the actual speed of the bearing retainer;
s3, calculating the sliding speed of the retainer according to the rotating speed of the inner ring of the bearing and the actual speed of the bearing retainer;
s4, calculating the sliding degree of the bearing according to the sliding speed of the retainer and the rotating speed of the inner ring of the bearing;
s5, judging whether the slip degree is larger than a set threshold value, if so, enabling the bearing to have slip faults; if not, the bearing has no slip fault. The slip degree is evaluated on the anti-slip performance and the current slip state of the bearing by comparing the slip degree with a set threshold value, wherein the set threshold value is set according to the specific working environment of the bearing.
In this embodiment, the bearing includes an outer race, an inner race, a cage, and rollers. The strong magnet 1 is provided at a certain position of the inner ring, the outer ring is taken as a first target position of the outer ring, the strong magnet 21 is provided at the first target position of the outer ring, and the hall sensor 31 is provided on the strong magnet 21.
Assuming that the outer ring of the bearing is fixed, the inner ring of the bearing rotates, and the inner ring strong magnet 1 and the outer ring strong magnet 21 meet each other every time the inner ring rotates, the change of the magnetic field is detected by the hall sensor 31, and a larger pulse frequency f is generated due to the change of the magnetic field, and then the rotating speed v of the inner ring of the bearing is determined according to the following formula:
wherein f is the pulse frequency of the magnetic field where the bearing inner ring is positioned.
In this embodiment, n weak magnets are uniformly arranged on the retainer in the circumferential direction, and the n weak magnets form a weak magnet array. Assuming that the outer ring of the bearing is fixed, the bearing retainer rotates along with the roller, and the Hall sensor 31 senses n magnetic field changes every time the retainer rotates for one circle, so that n small pulses are generated, and the small pulse frequency is f c The actual speed v of the bearing cage is determined according to the formula c ：
Wherein n is the number of magnets circumferentially and uniformly arranged on the retainer; f (f) c The pulse frequency of the magnetic field in which the retainer is positioned. The n weak magnets are uniformly circumferentially arranged on the retainer, so that the distances between adjacent weak magnets are equal, and the calculated actual speed v is ensured c Accuracy of (3).
The signal waveform of the Hall sensor is superposition of a large pulse waveform and a small pulse waveform, and pulse frequencies of two different waveforms can be obtained by carrying out Fourier transform on the waveform signal.
In the present embodiment, the slip speed v of the cage is determined according to the following formula h ：
Wherein v is h1 A first slip speed for the cage; v h2 A second slip speed for the cage; the first sliding speed and the second sliding speed are both differences between the actual speed of the bearing retainer and the theoretical speed of the bearing retainer; the speed of the inner ring of the bearing is taken as the theoretical speed of the bearing retainer.
The center of the circle of the outer ring is taken as a symmetry point, the symmetry position of the first target position of the outer ring is taken as the second target position of the outer ring, the strong magnet 22 is arranged at the second target position of the outer ring, and the Hall sensor 32 is arranged on the strong magnet 22. The pulse frequency f of the two different waveforms is measured by the hall sensor 31 1 And f c1 Obtaining the actual speed v of the retainer c1 Velocity v with bearing inner race 1 Further obtain a first slip velocity v h1 V is c1 -v 1 The method comprises the steps of carrying out a first treatment on the surface of the The pulse frequency f of two different waveforms is measured by the hall sensor 32 2 And f c2 Obtaining the actual speed v of the retainer c2 Velocity v with bearing inner race 2 Further obtain a second slip velocity v h2 V is c2 -v 2 。
Two Hall sensors are symmetrically arranged to obtain two sliding speeds, and the average value of the two sliding speeds is taken as the sliding speed v of the retainer h Thereby ensuring the sliding speed v of the retainer h Accuracy of (3).
In this embodiment, the slip degree S of the bearing is determined according to the following formula:
wherein a is h For the sliding speed v of the cage h Corresponding acceleration; k (k) 1 、k 2 K 3 Are slip coefficients. The acceleration a h By sliding velocity v of cage h Deriving over time, the slip coefficient k 1 、k 2 K 3 Depending on the particular bearing operating conditions and bearing type.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (4)
1. The method for evaluating the slip state of the bearing is characterized by comprising the following steps of: the method comprises the following steps:
s1, determining the rotating speed of an inner ring of a bearing;
s2, determining the actual speed of the bearing retainer;
s3, calculating the sliding speed of the retainer according to the rotating speed of the inner ring of the bearing and the actual speed of the bearing retainer;
s4, calculating the sliding degree of the bearing according to the sliding speed of the retainer and the rotating speed of the inner ring of the bearing;
the degree of slip S of the bearing is determined according to the following formula:
wherein a is h For the sliding speed v of the cage h Corresponding acceleration; k (k) 1 、k 2 K 3 Are slip coefficients; v c The actual speed of the bearing cage;
s5, judging whether the slip degree is larger than a set threshold value, if so, enabling the bearing to have slip faults; if not, the bearing has no slip fault.
2. The method of assessing a slip condition of a bearing of claim 1, wherein: the bearing inner ring rotation speed v is determined according to the following formula:
wherein f is the pulse frequency of the magnetic field where the bearing inner ring is positioned.
3. The method of assessing a slip condition of a bearing of claim 1, wherein: determining the actual speed v of the bearing cage according to the formula c ：
Wherein n is the number of magnets circumferentially and uniformly arranged on the retainer; f (f) c The pulse frequency of the magnetic field in which the retainer is positioned.
4. The method of assessing a slip condition of a bearing of claim 1, wherein: determining the slip speed v of the cage according to the following formula h ：
Wherein v is h1 A first slip speed for the cage; v h2 A second slip speed for the cage; the first sliding speed and the second sliding speed are both differences between the actual speed of the bearing retainer and the theoretical speed of the bearing retainer; the speed of the inner ring of the bearing is taken as the theoretical speed of the bearing retainer.
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| CN202110852645.8A CN113536486B (en) | 2021-07-27 | 2021-07-27 | Bearing slip state evaluation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110852645.8A CN113536486B (en) | 2021-07-27 | 2021-07-27 | Bearing slip state evaluation method |
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| CN113536486A CN113536486A (en) | 2021-10-22 |
| CN113536486B true CN113536486B (en) | 2023-05-12 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105377622A (en) * | 2013-07-08 | 2016-03-02 | Ntn株式会社 | Slip control device for electric vehicle |
| CN108474412A (en) * | 2016-01-21 | 2018-08-31 | 舍弗勒技术股份两合公司 | Method and measuring device for detecting the slip rate in rolling bearing |
| CN209247606U (en) * | 2018-10-25 | 2019-08-13 | 清华大学苏州汽车研究院（相城） | A kind of coefficient of road adhesion test device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6851864B2 (en) * | 2002-02-27 | 2005-02-08 | Nsk Ltd. | Rolling bearing |
| US7705972B2 (en) * | 2006-06-20 | 2010-04-27 | Virginia Tech Intellectual Properties, Inc. | Doppler sensor for the derivation of torsional slip, friction and related parameters |
| CN108825748B (en) * | 2018-08-23 | 2023-12-08 | 曹洪 | Differential mechanism capable of automatically limiting differential speed ratio and increasing torque |
| CN110514443B (en) * | 2019-09-04 | 2021-07-23 | 中国航发哈尔滨轴承有限公司 | Non-contact measurement method for slip ratio of aviation bearing retainer |
| CN111999059B (en) * | 2020-09-02 | 2022-06-28 | 洛阳轴承研究所有限公司 | Bearing is beaten slip rate test and is used device and use device's test system |
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- 2021-07-27 CN CN202110852645.8A patent/CN113536486B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105377622A (en) * | 2013-07-08 | 2016-03-02 | Ntn株式会社 | Slip control device for electric vehicle |
| CN108474412A (en) * | 2016-01-21 | 2018-08-31 | 舍弗勒技术股份两合公司 | Method and measuring device for detecting the slip rate in rolling bearing |
| CN209247606U (en) * | 2018-10-25 | 2019-08-13 | 清华大学苏州汽车研究院（相城） | A kind of coefficient of road adhesion test device |
Non-Patent Citations (1)
| Title |
|---|
| Boundary for Aviation Bearing Accelerated Life Test Based on Quasi-dynamic Analysis;Liqin Wang 等;《Tribology International》;1-11 * |
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