CN105468804B - A method of it calculating rotary machine rotor and resonant vibration probability occurs - Google Patents
A method of it calculating rotary machine rotor and resonant vibration probability occurs Download PDFInfo
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- CN105468804B CN105468804B CN201510332230.2A CN201510332230A CN105468804B CN 105468804 B CN105468804 B CN 105468804B CN 201510332230 A CN201510332230 A CN 201510332230A CN 105468804 B CN105468804 B CN 105468804B
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Abstract
The invention discloses overall machine vibration monitorings and fault analysis and diagnosis, the present invention is on the basis of furtheing investigate rotor dynamics, the concept and specific algorithm of " resonance index " are proposed with unique thinking, purpose is a possibility that allowing the operator of rotating machinery to understand rotor operation rotation speed change in time and may causing resonance size, operator's adjusting process is reminded especially for the unit equipment moment of rotation speed change wider range, allow rotor real work revolving speed far from its intrinsic frequency, unit is avoided critical speed resonance occur, achieve the purpose that protect unit safety operation.Summary of the invention: combining by the way that rotor dynamic theory and execute-in-place are practical, invents the concept and specific algorithm of " resonance index ".Indicate that rotor is in the operating status of " strong resonance, slight resonance, is detached from resonance, far from resonance and without resonance at serious resonance " with 1.0,0.8,0.6,0.4,0.2 and 0 different resonance index numerical value, make the resonance degree of rotor very clear, without any abstruse, many and diverse professional knowledge.
Description
Technical field
The present invention relates to mechanical equipment state monitoring technical field more particularly to a kind of calculate rotary machine rotor
The method of resonant vibration probability.
Background technique
Any rotating machinery all contains most important rotor part, the vibration frequency that each rotor has itself intrinsic
Rate, it may be assumed that rotor intrinsic frequency or be critical rotor speed.When rotor real work revolving speed and its intrinsic frequency are got too close to
When (or be greater than or be less than), then it can cause rotor and strong vibration occur, it may be assumed that resonance.Resonance refers to mechanical system institute excited target
Frequency when being close with the critical speed of the system, the phenomenon that system amplitude significantly increases.Covibration is in rotating machinery
It needs to be absolutely avoided, rotor otherwise will be caused to damage due to excessive vibration, in some instances it may even be possible to cause catastrophic failure.
Therefore, for important slewing, it is necessary to which its moving situation of real-time monitoring carries out pre- before resonating
It is alert, to remind operator to avoid harm in time.In the operation of actual unit, since operator is not rotor dynamic
Professional researcher is difficult to grasp to its esoteric theoretical system.How the method for science is passed through to this complicated fortune
Dynamic process carries out probability calculation, and informs operator with simple and clear mode, is needs research and with choosing
The project of war property.
By retrieving to existing research achievement and patent, some resonance meter is carried out according to rotor physical characteristic although having
The research achievement of calculation, but these methods are cumbersome, calculating process is complicated, not only need the theoretical knowledge basis of profession, but also
Calculated result cannot be used directly for the practice operation of worker for layman's indigestion.So the present invention is based on to rotation
It makes a connection on the basis of the revolving speed real-time monitoring of tool, according to rotating machinery power principle, has investigated a kind of calculating rotor resonance
The calculation method of probability of happening, and the theoretical knowledge for not needing complexity and profession of this method, can simply know
The case where operator's resonance probability of happening, to effectively avoid the generation of resonance.
Summary of the invention
The present invention be on the basis of furtheing investigate rotor dynamics, with unique thinking propose " resonance index " concept and
Specific algorithm.Purpose is to allow the operator of rotating machinery to understand rotor operation rotation speed change in time and may cause resonance
Possibility size reminds operator especially for unit equipment (such as: the wind power generating set) moment of rotation speed change wider range
Member's adjusting process, allows rotor real work revolving speed according to its intrinsic frequency, unit is avoided critical speed resonance occur, reach protection
The purpose of unit safety operation.On the basis of furtheing investigate rotor dynamic theory, in conjunction with the reality of site technique operator
Border demand invents the concept and specific algorithm of " resonance index ".
In order to solve the above technical problems, the invention is realized by the following technical scheme, comprising the following steps:
Step 1, the determination of critical speed
A statistics revolving speed section and data history section, i.e., the vibration velocity one that our systems are drawn at present) are defined by system
Rotor speed curve determines the critical speed of rotor-support-foundation system by its " inflection point " data, and after being confirmed by analyst, configuration is completed should
Unit rotor critical speed ncConfirmation (critical speed is with ncIt indicates)；
B) the experimental test data that rotor-support-foundation system critical speed is provided from unit manufacturer, and after being confirmed by analyst,
Configuration completes unit rotor critical speed ncConfirmation；
Step 2, the calculating in speed error section
With the critical speed n of confirmationcBased on, rotor actual speed n is calculated with respect to its interval range, defines speed error
Section=| nc-n|/nc, and as a percentage.
Step 3, the determination of resonance index
Resonance index mentioned here is that the present invention defines, and using speed error section as basic data, indicates rotor
A possibility that running, resonate under its actual speed is different from other documents.It is divided into following several situations:
A) acutely resonance: when speed error section≤± 10%, then resonance index=1 is defined (such as: confirmed rotor system
Unite critical speed nc=1100rpm, for rotor actual speed in 990rpm≤n≤1210rpm, system will define resonance index
=1)；
B) serious resonance: when ± 10% ﹤ speed error section≤± 15%, then resonance index=0.8 is defined (such as: warp
Confirm rotor-support-foundation system critical speed nc=1100rpm, rotor actual speed 935rpm≤n ﹤ 990rpm or 1210rpm ﹤ n≤
When 1265rpm, system will define resonance index=0.8)；
C) slight resonance: when ± 15% ﹤ speed error section≤± 20%, then resonance index=0.6 is defined (such as: warp
Confirm rotor-support-foundation system critical speed nc=1100rpm, rotor actual speed 880rpm≤n ﹤ 935rpm or 1265rpm ﹤ n≤
When 1320rpm, system will define resonance index=0.6)；
D it) is detached from resonance: when ± 20% ﹤ speed error section≤± 25%, then defining resonance index=0.4 (such as: warp
Confirm rotor-support-foundation system critical speed nc=1100rpm, rotor actual speed 825rpm≤n ﹤ 880rpm or 1320rpm ﹤ n≤
When 1375rpm, system will define resonance index=0.4)；
E) far from resonance: when ± 25% ﹤ speed error section≤± 30%, then defining resonance index=0.2 (such as: warp
Confirm rotor-support-foundation system critical speed nc=1100rpm, rotor actual speed 770rpm≤n ﹤ 825rpm or 1375rpm ﹤ n≤
When 1430rpm, system will define resonance index=0.2)；
The specific evaluation of " resonance index " is carried out according to the present invention, operator understands, simply, legibly knows institute
There is the degree of danger to resonate in operation mechanical equipment rotor, with 1.0,0.8,0.6,0.4,0.2 different resonance index numerical value, table
Show that rotor is in the operating status of " strong resonance, slight resonance, is detached from resonance, far from resonance at serious resonance ", allows being total to of rotor
The index that shakes is very clear, without any abstruse, many and diverse professional knowledge.
Specific embodiment
To elaborate to the embodiment of the present invention below, the present embodiment under the premise of the technical scheme of the present invention into
Row is implemented, and the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following realities
Apply example.
The present embodiment is using certain rotary machine rotor as concrete application background.The critical speed n of rotor in examplec=
1100rpm, rotor actual speed n=890rpm.
The present embodiment the following steps are included:
Step 1, the determination of critical speed
A statistics revolving speed section and data history section, i.e., the vibration velocity one that our systems are drawn at present) are defined by system
Rotor speed curve determines the critical speed of rotor-support-foundation system by its " inflection point " data, and after being confirmed by analyst, configuration is completed should
Unit rotor critical speed ncConfirmation (critical speed is with ncIt indicates)；
B) the experimental test data that rotor-support-foundation system critical speed is provided from unit manufacturer, and after being confirmed by analyst,
Configuration completes unit rotor critical speed ncConfirmation, finally determine nc=1100rpm.
Step 2, the calculating in speed error section
With the critical speed n of confirmationcBased on, rotor actual speed n=890rpm is calculated with respect to its interval range, is determined
Speed error section=| nc-n|/nc=11%.
Step 3, the determination of resonance index
Due to ± 10% ﹤ speed error section≤± 15%, according to the definition of resonance index can determine resonance index=
0.8, belong to serious resonance.It needs that operator is reminded to adjust revolving speed in time at this time, observes rotor condition, prevent rotor from occurring altogether
Vibration, effectively avoids the generation of accident.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (1)
1. a kind of method for calculating rotary machine rotor and resonant vibration probability occurring, which is characterized in that
1) resonance index obtains:
A statistics revolving speed section and data history section) are defined by system, one rotor speed of vibration velocity for obtaining system drafting is bent
Line determines the critical speed of rotor-support-foundation system by its " inflection point " data, and after being confirmed by analyst, that configuration completes unit rotor is critical
Revolving speed ncConfirmation；
B) the experimental test data that rotor-support-foundation system critical speed is provided from unit manufacturer, and after being confirmed by analyst, configuration
Complete unit rotor critical speed ncConfirmation；
2) resonance index defines: using rotor actual speed n in the section position of the critical speed of confirmation as basis data, and root
It is located at critical speed difference section according to actual speed and provides different indexes, indicates that rotor is run under its actual speed, occur
A possibility that resonance；
3) algorithm of rotor " resonance index ":
A acutely resonates: when rotor actual speed is located at ± 10% section of its critical speed, then defining resonance index=1；
B seriously resonates: when rotor actual speed is located at its critical speed ± 15%, and the section except ± 10%, then definition is total
Shake index=0.8；
C slightly resonates: when rotor actual speed is located at its critical speed ± 20%, and the section except ± 15%, then definition is total
Shake index=0.6；
D is detached from resonance: when rotor actual speed is located at its critical speed ± 25%, and the section except ± 20%, then definition is total
Shake index=0.4；
E is far from resonance: when rotor actual speed is located at its critical speed ± 30%, and the section except ± 25%, then definition is total
Shake index=0.2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510332230.2A CN105468804B (en) | 2015-06-16 | 2015-06-16 | A method of it calculating rotary machine rotor and resonant vibration probability occurs |
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| CN201510332230.2A CN105468804B (en) | 2015-06-16 | 2015-06-16 | A method of it calculating rotary machine rotor and resonant vibration probability occurs |
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| CN105468804B true CN105468804B (en) | 2019-04-26 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104361145A (en) * | 2014-09-19 | 2015-02-18 | 大连理工大学 | Rotor dynamics modeling method based on axle closely attached coordinate system |
| CN104536475A (en) * | 2014-11-29 | 2015-04-22 | 四川达宇特种车辆制造厂 | Method for adjusting the critical speed of high-speed combined rotor of micro turbojet engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8771891B2 (en) * | 2006-08-15 | 2014-07-08 | GM Global Technology Operations LLC | Diagnostic system for unbalanced motor shafts for high speed compressor |
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2015
- 2015-06-16 CN CN201510332230.2A patent/CN105468804B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104361145A (en) * | 2014-09-19 | 2015-02-18 | 大连理工大学 | Rotor dynamics modeling method based on axle closely attached coordinate system |
| CN104536475A (en) * | 2014-11-29 | 2015-04-22 | 四川达宇特种车辆制造厂 | Method for adjusting the critical speed of high-speed combined rotor of micro turbojet engine |
Non-Patent Citations (1)
| Title |
|---|
| 《应用振动监测与故障分析诊断技术提高泵站设备管理水平》;赵顺萍等;《中国给水排水》;20150331;第31卷(第6期);第105-108页 * |
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