CN102012263B - Method for identifying turbine unit rotor vibration in-phase component stability in real time - Google Patents

Method for identifying turbine unit rotor vibration in-phase component stability in real time Download PDF

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CN102012263B
CN102012263B CN2010105432681A CN201010543268A CN102012263B CN 102012263 B CN102012263 B CN 102012263B CN 2010105432681 A CN2010105432681 A CN 2010105432681A CN 201010543268 A CN201010543268 A CN 201010543268A CN 102012263 B CN102012263 B CN 102012263B
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phase component
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rotor
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宋光雄
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North China Electric Power University
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Abstract

The invention discloses a method for identifying turbine unit rotor vibration in-phase component stability in real time in the technical fields of rotating machinery vibration state monitoring and fault diagnosis, which is used for automatically monitoring and analyzing the rotor vibration in-phase component stability on line in real time. The method comprises the following steps of: setting timing length and stepping length; acquiring relative vibration data of shafts supporting a bearing on two sides of the rotor, a rotating speed signal of the rotor and a bonding phase signal in the process of stepping for a length; calculating amplitude and phase of relative vibration in-phase component of supporting shafts on the two sides of the rotor and storing the amplitude and phase; and when set timing length is achieved, verifying the in-phase component amplitude specific entropy mean value and the in-phase component phase difference; and by judging whether the in-phase component amplitude specific entropy mean value and the in-phase component phase difference pass the verification, determining whether the turbine unit rotor vibration in-phase component is stable. The method analyzes shaft relative vibration amplitude and phase data to obtain a fault diagnosis conclusion, and provides guarantee for safe operation of the turbine unit rotor.

Description

Steam Turbine rotor oscillation in-phase component stationarity real-time identification method
Technical field
The invention belongs to rotating machinery vibrating condition monitoring and fault diagnosis technical field, relate in particular to a kind of Steam Turbine rotor oscillation in-phase component stationarity real-time identification method.
Background technology
The safe reliability of Turbo-generator Set is one of matter of utmost importance in using with operation the device design fabrication phase.Unit vibration is an important indicator of unit safety reliability.The operation of Reduction of Students' Study Load lotus often takes place, or shuts down and handle in the unit that vibration is worse off, or urgent forced outage.To the dealing with improperly or paroxysmal vibration occurs of vibration, all possibly make unit that local or whole catastrophic failure take place.
Turbo-generator Set long-time running under working speed is had relatively high expectations to the vibration stationarity.If the vibration of rotor of turbogenerator set first critical speed is excessive, can cause bigger influence to working speed, under working speed, there is bigger in phase vibration component.
Steam-electric generating set shafting rotor oscillation in-phase component stationarity is differentiated need of work by the expert's completion with certain on-the-spot vibrating failure diagnosis experience, and higher to expert's subjectivity degree of dependence, objectivity is relatively poor.Therefore, propose a kind of Steam Turbine rotor oscillation in-phase component stationarity real-time identification method and just seem very important.
Steam Turbine rotor oscillation in-phase component stationarity real-time identification method provided by the invention; Shaft system of unit rotor oscillation in-phase component situation of change is carried out real-time automatic on-line monitoring, analyzed, differentiates, improve rotor oscillation in-phase component stationarity identification efficient and accuracy.
Summary of the invention
The objective of the invention is to; A kind of Steam Turbine rotor oscillation in-phase component stationarity real-time identification method is provided; Be used for shaft system of unit rotor oscillation in-phase component situation of change is carried out real-time automatic on-line monitoring, analyzed, differentiates, improve rotor oscillation in-phase component stationarity identification efficient and accuracy.
Technical scheme is that a kind of Steam Turbine rotor oscillation in-phase component stationarity real-time identification method is characterized in that comprising the following steps:
Step 1: the length t that sets duration T and stepping;
Step 2: obtain the relative vibration data of axle of rotor both sides radial journal bearing, the tach signal and the key signal of rotor;
Step 3: the relative vibration data of axle according to rotor both sides radial journal bearing, calculate rotor both sides supporting axis and vibrate the amplitude and the phase place of in-phase component relatively and store said amplitude and phase place;
Step 4: judge whether to reach and set duration T, if reach, then execution in step 5; Otherwise, execution in step 6;
Step 5: behind length t of stepping, return step 2;
Step 6: the rotor both sides supporting axis of storing during according to length t of each stepping vibrates the amplitude and the phase place of in-phase component relatively, checking in-phase component amplitude specific entropy average and in-phase component phase difference value;
Step 7: judge whether checking in-phase component amplitude specific entropy average and in-phase component phase difference value all pass through, if judge that then Steam Turbine rotor oscillation in-phase component is steady; Otherwise, judge that Steam Turbine rotor oscillation in-phase component is not steady.
Said step 3 specifically comprises:
Step 101: the relative vibration data of axle according to rotor both sides radial journal bearing, utilize the FFT frequency spectrum analysis method, calculate rotor both sides radial journal bearing in real time synchronously and vibrate power frequency vibration amplitude and phase place relatively; Rotor one side radial journal bearing is vibrated the power frequency vibration amplitude relatively be designated as a Ra, phase place is designated as p RaRotor opposite side radial journal bearing vibrates the power frequency vibration amplitude relatively and is designated as a Rb, phase place is designated as p Rb
Step 102: utilize formula A Real=a Ra* cos (p Ra) and A Imagi=a Ra* sin (p Ra), the axle that the calculates rotor one side radial journal bearing power frequency vibration vector that shakes
Figure BSA00000344966900031
Real part A RealWith imaginary part A ImagiUtilize formula B Real=a Rb* cos (p Rb) and B Imagi=a Rb* sin (p Rb) axle that the calculates rotor opposite side radial journal bearing power frequency vibration vector that shakes
Figure BSA00000344966900032
Real part B RealWith imaginary part B Imagi
Step 103: the use of the formula
Figure BSA00000344966900033
Calculate bearing support on both sides of the rotor shaft vibration frequency vibration phase component
Figure BSA00000344966900034
Step 104: utilize S Real=1/2 * (A Real+ B Real) and S Imagi=1/2 * (A Imagi+ B Imagi), calculate said in-phase component
Figure BSA00000344966900035
Real part S RealWith imaginary part S Imagi, utilize formula again Calculate the amplitude that rotor both sides supporting axis vibrates in-phase component relatively, utilize formula S Phase=(180/ π) * arctan (S Real/ S Imagi) calculate the phase place that rotor both sides supporting axis vibrates in-phase component relatively.
Said checking in-phase component amplitude specific entropy average is specifically:
Step 201: when calculating length t of every stepping, in-phase component
Figure BSA00000344966900037
Amplitude
Figure BSA00000344966900038
With the qualified value S of amplitude StdRatio
Figure BSA00000344966900039
Figure BSA000003449669000310
Figure BSA000003449669000311
Step 202: utilize formula
Figure BSA000003449669000312
Ratio calculated
Figure BSA000003449669000313
Entropy average E Mean, in the formula
Figure BSA000003449669000314
And regulation is worked as
Figure BSA000003449669000315
The time,
Figure BSA000003449669000316
Said checking in-phase component phase difference value is specifically:
Calculate among the whole setting duration T; During length t of every stepping, the absolute value
Figure BSA000003449669000320
of phase place maximal value
Figure BSA000003449669000318
in all in-phase components of storage
Figure BSA000003449669000317
and phase minimum
Figure BSA000003449669000319
difference is
Figure BSA000003449669000321
wherein
Whether said judgement checking in-phase component amplitude specific entropy average is through specifically being judgement E MeanWhether more than or equal to 0, if verify that then in-phase component amplitude specific entropy average passes through; Otherwise checking in-phase component amplitude specific entropy average is not passed through.
Whether said checking in-phase component phase difference value is through specifically being; Whether the phase place maximal value
Figure BSA00000344966900042
in all in-phase components
Figure BSA00000344966900041
of judgement storage and the absolute value of phase minimum
Figure BSA00000344966900043
difference be smaller or equal to setting value D; If verify that then the in-phase component phase difference value passes through; Otherwise checking in-phase component phase difference value does not pass through.
Said setting duration T=900 second.
The length of said stepping is t=0.1 second.
The qualified value S of said amplitude Std=50um.
Said setting value D=5 °.
Effect of the present invention is; Steam Turbine rotor oscillation in-phase component stationarity real-time identification method is utilized relative vibration amplitude of the axle of unit operation rotor and phase data; Obtain the fault diagnosis conclusion through the computational analysis judgement, for the safe operation of Steam Turbine rotor provides guarantee.
Description of drawings
Fig. 1 is a Steam Turbine rotor oscillation in-phase component stationarity real-time identification synoptic diagram;
Fig. 2 is a Steam Turbine rotor oscillation in-phase component stationarity real-time identification method flow diagram;
Fig. 3 is amplitude and the phase calculation process flow diagram that rotor both sides supporting axis vibrates in-phase component relatively.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, rather than in order to limit scope of the present invention and application thereof.
Embodiment
The relative vibration data of turbine generator unit shaft that the real-time identification method needs, the tach signal and the key signal of rotor can obtain from the supervisory instrument (TSI) of configuration Turbo-generator Set or can obtain from professional vibrating data collection conditioning device.In the present embodiment, the key signal of relative vibration signal of turbine generator unit shaft and analysis of vibration signal processing needs obtains from the professional vibrating data collection conditioning device that links to each other with vibration transducer.Fig. 1 is a Steam Turbine rotor oscillation in-phase component stationarity real-time identification synoptic diagram; Among Fig. 1; In the slot that high-speed data acquisition card insertion industrial microcomputer (IPC) provides; Requirement according to high-speed data acquisition card; The key signal that specialty vibrating data collection conditioning device processing relative vibration signal of turbine generator unit shaft and analysis of vibration signal processing need, the high-speed data acquisition card in the key signal input IPC that relative vibration signal of turbine generator unit shaft after treatment and analysis of vibration signal processing need.Above technology all is those skilled in the art's a common practise.Afterwards, according to the concrete shaft system of unit rotor oscillation in-phase component stationarity computer real-time identification program of method design provided by the invention, the real-time identification program is installed in the industrial microcomputer (IPC) again.
Fig. 2 is a Steam Turbine rotor oscillation in-phase component stationarity real-time identification method flow diagram.Before the method for embodiment of the present invention is implemented, can the qualified value S of first set amplitude Std=50um, setting value D=5 °.Among Fig. 2, Steam Turbine rotor oscillation in-phase component stationarity real-time identification method comprises:
Step 1: the length t that sets duration T and stepping.
In the present embodiment; Set duration T=900 second; The length of stepping is t=0.1 second, and then cycle index is inferior.
Step 2: obtain the relative vibration data of axle of rotor both sides radial journal bearing, the tach signal and the key signal of rotor.
As previously mentioned; The axle of the rotor both sides radial journal bearing relatively tach signal and the key signal of vibration data, rotor obtains and handles through the vibrating data collection conditioning device, and the key signal that the relative vibration signal of the turbine generator unit shaft after will handling and analysis of vibration signal processings need is imported the interior high-speed data acquisition card of IPC.
Step 3: the relative vibration data of axle according to rotor both sides radial journal bearing, calculate rotor both sides supporting axis and vibrate the amplitude and the phase place of in-phase component relatively and store said amplitude and phase place.
Fig. 3 is amplitude and the phase calculation process flow diagram that rotor both sides supporting axis vibrates in-phase component relatively.Among Fig. 3, calculating rotor both sides supporting axis vibrates the amplitude of in-phase component relatively and the process of phase place is:
Step 101: the relative vibration data of axle according to rotor both sides radial journal bearing, utilize the FFT frequency spectrum analysis method, calculate rotor both sides radial journal bearing in real time synchronously and vibrate power frequency vibration amplitude and phase place relatively; Rotor one side radial journal bearing is vibrated the power frequency vibration amplitude relatively be designated as a Ra, phase place is designated as p RaRotor opposite side radial journal bearing vibrates the power frequency vibration amplitude relatively and is designated as a Rb, phase place is designated as p Rb
Step 102: the axle that the calculates rotor one side radial journal bearing power frequency vibration vector that shakes
Figure BSA00000344966900061
Real part A Real, imaginary part A Imagi, adopt formula (1), (2) to calculate during calculating.
A real＝a ra×cos(p ra) (1)
A imagi＝a ra×sin(p ra) (2)
Then, the axle that the calculates rotor opposite side radial journal bearing power frequency vibration vector that shakes Real part B RealWith imaginary part B Imagi, adopt formula (3), (4) to calculate during calculating.
B real＝a rb×cos(p rb) (3)
B imagi＝a rb×sin(p rb) (4)
Step 103: Calculate bearing support on both sides of the rotor shaft vibration frequency vibration phase component
Figure BSA00000344966900063
is calculated using the formula
Figure BSA00000344966900064
Step 104: utilize formula (5), (6) to calculate in-phase component respectively
Figure BSA00000344966900065
Real part S Real, imaginary part S Imagi
S real＝1/2×(A real+B real) (5)
S imagi＝1/2×(A imagi+B imagi) (6)
Utilize formula (7), (8) to calculate the amplitude S that rotor both sides supporting axis vibrates in-phase component relatively again Amp(unit is μ m) and phase place S Phase(unit be °, i.e. angular unit).
S amp = ( s real ) 2 + ( S imagi ) 2 - - - ( 7 )
S phase＝(180/π)×arctan(S real/S imagi) (8)
After the calculating, the shake in-phase component of power frequency vibration of storage rotor two side shafts
Figure BSA00000344966900071
Amplitude S AmpAnd phase place.
Step 4: judge whether to reach and set duration 900 seconds, if reach, then execution in step 6; Otherwise, execution in step 5.
Step 5: length t of stepping, i.e. stepping 0.1 second.Return step 2 afterwards.
Step 6: the rotor both sides supporting axis of storage vibrates the amplitude and the phase place of in-phase component relatively during according to length of each stepping (0.1 second), checking in-phase component amplitude specific entropy average and in-phase component phase difference value.
Verify in-phase component amplitude specific entropy (Shannon) average specifically:
Step 201: calculate length t=0.1 of every stepping during second, in-phase component
Figure BSA00000344966900072
Amplitude
Figure BSA00000344966900073
With the qualified value S of amplitude StdRatio
Figure BSA00000344966900074
Figure BSA00000344966900075
0≤i≤9000.In the present embodiment, the qualified value S of the amplitude of setting Std=50um.
Step 202: utilize formula Ratio calculated
Figure BSA00000344966900077
Entropy (Shannon) average E Mean, n=9000 in the formula, and regulation is worked as The time,
Figure BSA00000344966900079
Verify the in-phase component phase difference value specifically:
Calculate whole setting duration T=900 in second; Length t=0.1 of every stepping is during second, and the absolute value of phase place maximal value
Figure BSA000003449669000711
in all in-phase components of storage
Figure BSA000003449669000710
and phase minimum
Figure BSA000003449669000712
difference is 0≤i≤9000 wherein.
Step 7: judge whether checking in-phase component amplitude specific entropy average and in-phase component phase difference value all pass through.
Judge that whether checking in-phase component amplitude specific entropy (Shannon) average is through specifically being judgement E MeanWhether more than or equal to 0, if verify that then in-phase component amplitude specific entropy average passes through; Otherwise checking in-phase component amplitude specific entropy average is not passed through.
Judge that whether checking in-phase component phase difference value is through specifically being; Whether the phase place maximal value
Figure BSA00000344966900082
in all in-phase components
Figure BSA00000344966900081
of judgement storage and the absolute value of phase minimum
Figure BSA00000344966900083
difference be smaller or equal to setting value D=5 °; If verify that then the in-phase component phase difference value passes through; Otherwise checking in-phase component phase difference value does not pass through.
If whether checking in-phase component amplitude specific entropy average and in-phase component phase difference value all pass through, judge that then Steam Turbine rotor oscillation in-phase component is steady; Otherwise, judge that Steam Turbine rotor oscillation in-phase component is not steady.
Steam Turbine rotor oscillation in-phase component stationarity real-time identification method provided by the invention; Shaft system of unit rotor oscillation in-phase component situation of change is carried out real-time automatic on-line monitoring, analyzed, differentiates, improve rotor oscillation in-phase component stationarity identification efficient and accuracy.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (5)

1. a Steam Turbine rotor oscillation in-phase component stationarity real-time identification method is characterized in that comprising the following steps:
Step 1: the length t that sets duration T and stepping;
Step 2: obtain the relative vibration data of axle of rotor both sides radial journal bearing, the tach signal and the key signal of rotor;
Step 3: the relative vibration data of axle according to rotor both sides radial journal bearing, calculate rotor both sides supporting axis and vibrate the amplitude and the phase place of in-phase component relatively and store said amplitude and phase place; Amplitude and phase place that said calculating rotor both sides supporting axis vibrates in-phase component relatively specifically comprise:
Step 101: the relative vibration data of axle according to rotor both sides radial journal bearing, utilize the FFT frequency spectrum analysis method, calculate rotor both sides radial journal bearing in real time synchronously and vibrate power frequency vibration amplitude and phase place relatively; Rotor one side radial journal bearing is vibrated the power frequency vibration amplitude relatively be designated as a Ra, phase place is designated as p RaRotor opposite side radial journal bearing vibrates the power frequency vibration amplitude relatively and is designated as a Rb, phase place is designated as p Rb
Step 102: utilize formula A Real=a Ra* cos (p Ra) and A Imagi=a Ra* sin (p Ra), the axle that the calculates rotor one side radial journal bearing power frequency vibration vector that shakes
Figure FSB00000690964300011
Real part A RealWith imaginary part A ImagiUtilize formula B Real=a Rb* cos (p Rb) and B Imagi=a Rb* sin (p Rb) axle that the calculates rotor opposite side radial journal bearing power frequency vibration vector that shakes Real part B RealWith imaginary part B Imagi
Step 103: the use of the formula?
Figure FSB00000690964300013
calculate both sides of the rotor shaft support bearing vibration frequency vibration phase component?
Figure FSB00000690964300014
Step 104: utilize S Real=1/2 * (A Real+ B Real) and S Imagi=1/2 * (A Imagi+ B Imagi), calculate said in-phase component
Figure FSB00000690964300015
Real part S RealWith imaginary part S Imagi, utilize formula again
Figure FSB00000690964300016
Calculate the amplitude that rotor both sides supporting axis vibrates in-phase component relatively, utilize formula S Phase=(180/ π) * arctan (S Real/ S Imagi) calculate the phase place that rotor both sides supporting axis vibrates in-phase component relatively;
Step 4: judge whether to reach and set duration T, if reach, then execution in step 5; Otherwise, execution in step 6;
Step 5: behind length t of stepping, return step 2;
Step 6: the rotor both sides supporting axis of storing during according to length t of each stepping vibrates the amplitude and the phase place of in-phase component relatively, checking in-phase component amplitude specific entropy average and in-phase component phase difference value;
Wherein, said checking in-phase component amplitude specific entropy average is specifically:
Step 201: when calculating length t of every stepping, in-phase component Amplitude
Figure FSB00000690964300022
With the qualified value S of amplitude StdRatio
Figure FSB00000690964300023
Figure FSB00000690964300025
Step 202: utilize formula
Figure FSB00000690964300026
Ratio calculated
Figure FSB00000690964300027
Entropy average E Mean, in the formula
Figure FSB00000690964300028
And regulation is worked as
Figure FSB00000690964300029
The time,
Figure FSB000006909643000210
Said checking in-phase component phase difference value is specifically:
Calculate among the whole setting duration T; During length t of every stepping, the absolute value
Figure FSB000006909643000214
of phase place maximal value
Figure FSB000006909643000212
in all in-phase components of storage
Figure FSB000006909643000211
and phase minimum
Figure FSB000006909643000213
difference is wherein
Step 7: judge whether checking in-phase component amplitude specific entropy average and in-phase component phase difference value all pass through, if judge that then Steam Turbine rotor oscillation in-phase component is steady; Otherwise, judge that Steam Turbine rotor oscillation in-phase component is not steady;
Wherein, whether said judgement checking in-phase component amplitude specific entropy average is through specifically being judgement E MeanWhether more than or equal to 0, if verify that then in-phase component amplitude specific entropy average passes through; Otherwise checking in-phase component amplitude specific entropy average is not passed through;
Whether said checking in-phase component phase difference value is through specifically being; Whether the phase place maximal value
Figure FSB00000690964300031
in all in-phase components
Figure FSB000006909643000216
of judgement storage and the absolute value of phase minimum
Figure FSB00000690964300032
difference be smaller or equal to setting value D; If verify that then the in-phase component phase difference value passes through; Otherwise checking in-phase component phase difference value does not pass through.
2. a kind of Steam Turbine rotor oscillation in-phase component stationarity real-time identification method according to claim 1 is characterized in that said setting duration T=900 second.
3. a kind of Steam Turbine rotor oscillation in-phase component stationarity real-time identification method according to claim 1, the length that it is characterized in that said stepping is t=0.1 second.
4. a kind of Steam Turbine rotor oscillation in-phase component stationarity real-time identification method according to claim 1 is characterized in that the qualified value S of said amplitude Std=50 microns.
5. a kind of Steam Turbine rotor oscillation in-phase component stationarity real-time identification method according to claim 1 is characterized in that said setting value D=5 °.
CN2010105432681A 2010-11-11 2010-11-11 Method for identifying turbine unit rotor vibration in-phase component stability in real time Expired - Fee Related CN102012263B (en)

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CN105092196A (en) * 2015-09-17 2015-11-25 山东钢铁股份有限公司 Time spectrum phase fault diagnosis device
CN107941327B (en) * 2018-01-03 2024-06-07 浙江中自庆安新能源技术有限公司 Monitoring method and monitoring device for mechanical equipment
CN113484001B (en) * 2021-06-30 2022-09-27 江苏方天电力技术有限公司 Method for testing differential vibration between connecting parts

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