CN110375684A - A kind of hydroturbine rotor non-roundness measurement method - Google Patents
A kind of hydroturbine rotor non-roundness measurement method Download PDFInfo
- Publication number
- CN110375684A CN110375684A CN201910771543.6A CN201910771543A CN110375684A CN 110375684 A CN110375684 A CN 110375684A CN 201910771543 A CN201910771543 A CN 201910771543A CN 110375684 A CN110375684 A CN 110375684A
- Authority
- CN
- China
- Prior art keywords
- roundness
- rotor
- air gap
- circle
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B13/00—Measuring arrangements characterised by the use of fluids
- G01B13/16—Measuring arrangements characterised by the use of fluids for measuring contours or curvatures
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Abstract
The invention discloses a kind of hydroturbine rotor non-roundness measurement methods, the air gap between stator and rotor is acquired using air gap sensors, multiple out-of-roundness indexs are calculated using the method for minimum two-multiply law Evaluation of Roundness Error, utilize statistical theory, abnormal data elimination method is introduced to multiple out-of-roundness achievement datas and arithmetic mean of instantaneous value extracts batch data characteristic value, the out-of-roundness index of our needs is finally obtained out, this approach increases significantly accuracies of measurement.
Description
Technical field
The present invention relates to turbine technology field, specially a kind of hydroturbine rotor non-roundness measurement method.
Background technique
With China's rapid economic development, no matter in terms of civilian electricity or commercial power, the electricity usage amount day in China
Benefit increases, and hydroelectric generation cause is also in high speed development, and the capacity and size of turbine-generator units are continuously increased, so that everybody is to water
The operation stability of turbine generator group receives much attention.Hydraulic turbine generator rotor is turbine-generator units important component, by
The composition such as shaft, bracket, magnetic yoke, magnetic pole, current collecting equipment, to generate magnetic field, transformation energy and transmitting torque.
Generator amature out-of-roundness is to send out an important mechanical parameter index of electronics rotor, steady to the safety of water turbine set
Fixed operation has important direct influence.The increase of out-of-roundness can cause the imbalance of magnetic pull, and be transmitted to unit bearing
On cause abnormal vibrations so that unit generate fatigue crack, cause rotor loosen, rotor field spider crackle or bracket fracture etc., sternly
Even cause rotor " sweeping thorax " accident when weight, causes unit to be unable to operate normally, cause huge economic loss.Therefore it studies
Generator amature out-of-roundness index measurement method improves accuracy of measurement, it appears very necessary.
Summary of the invention
The object of the invention is that providing a kind of hydroturbine rotor non-roundness measurement method to solve the above-mentioned problems.
The present invention through the following technical solutions to achieve the above objectives:
A kind of hydroturbine rotor non-roundness measurement method, comprising the following steps:
A, multiple air gap sensors are circumferentially evenly arranged, are pasted on stator core inner wall；By a key phase
It is pasted on stator core inner wall；Air gap value measured by an air gap sensors in one hydroturbine rotor swing circle according to
Pole arrangement comes out, and has just obtained the profile that rotor rotates a circle；
B, the acquisition of single out-of-roundness index: rotor is calculated using minimum two-multiply law and is rotated a circle the minimum two of profile
Multiply circle；It determines the relative position of central coordinate of circle Yu actual measuring center, the eccentricity and eccentric angle of rotor is determined with this, finally
The point on profile and the maximum distance Rmax between the center of circle of Least Square Circle and minimum range Rmin are found out, by maximum distance
Rmax and minimum range Rmin makees difference and obtains the out-of-roundness that difference Ei is the profile；
C, the acquisition of comprehensive out-of-roundness index: hydroturbine rotor rotation is turned around, and is surveyed by N number of air gap sensors of installation
Measuring N number of out-of-roundness index is E1, E2, E3 ... En；Hydroturbine rotor rotation is taken two turns, is sensed by N number of air gap of installation
Device measures 2*N out-of-roundness index, is analogized with secondary, obtains multiple out-of-roundness indexs；Multiple out-of-roundness achievement datas are drawn again
Enter abnormal data elimination method and arithmetic mean of instantaneous value extracts batch data characteristic value, obtains comprehensive out-of-roundness index.
The beneficial effects of the present invention are:
The air gap between stator and rotor is acquired using air gap sensors, is missed using minimum two-multiply law evaluation circularity
The method of difference calculates multiple out-of-roundness indexs, using statistical theory, introduces abnormal number to multiple out-of-roundness achievement datas
Batch data characteristic value is extracted according to scalping method and arithmetic mean of instantaneous value, finally obtains out the out-of-roundness index of our needs, this side
Method significantly improves accuracy of measurement.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of measurement of air gap in the present invention；
Fig. 2 is that air gap sensors signal waveform exports schematic diagram in the present invention；
Fig. 3 is Least Square Circle Circularity error evaluation schematic diagram in the present invention.
In figure: 1, key phase；2, air gap sensors.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings:
A kind of hydroturbine rotor non-roundness measurement method, comprising the following steps:
A, multiple air gap sensors 2 are circumferentially evenly arranged, are pasted on stator core inner wall；By a key phase
1 is pasted on stator core inner wall；Air gap value measured by an air gap sensors 2 in one hydroturbine rotor swing circle is pressed
It is come out according to pole arrangement, has just obtained the profile that rotor rotates a circle；
B, the acquisition of single out-of-roundness index: rotor is calculated using minimum two-multiply law and is rotated a circle the minimum two of profile
Multiply circle；It determines the relative position of central coordinate of circle Yu actual measuring center, the eccentricity and eccentric angle of rotor is determined with this, finally
The point on profile and the maximum distance Rmax between the center of circle of Least Square Circle and minimum range Rmin are found out, by maximum distance
Rmax and minimum range Rmin makees difference and obtains the out-of-roundness that difference Ei is the profile；
C, the acquisition of comprehensive out-of-roundness index: hydroturbine rotor rotation is turned around, N number of air gap sensors 2 of installation are passed through
Measuring N number of out-of-roundness index is E1, E2, E3 ... En；Hydroturbine rotor rotation is taken two turns, is passed by N number of air gap of installation
Sensor 2 measures 2*N out-of-roundness index, is analogized with secondary, obtains multiple out-of-roundness indexs；Again by multiple out-of-roundness achievement datas
It introduces abnormal data elimination method and arithmetic mean of instantaneous value extracts batch data characteristic value, obtain comprehensive out-of-roundness index.
Single out-of-roundness index is Ei, Ei=Rmax-Rmin (n of i=1,2,3 ...)；
N*N achievement data is E1, E2, E3, E4 ... En；
Calculate its arithmetic mean of instantaneous value M；
Calculating residual error Vi=Ei-M, (i=1,2 ..., n), calculate standard deviation by Bessel Formula；Σ is calculated
Formula is as follows:
If meeting following formula
|Ei-M|>3σ
Then think that Ei is abnormal data, is rejected；
The average value of remaining data after calculating E1, E2, E2, E4 ... En rejecting abnormalities data Ei, i.e., comprehensive out-of-roundness refer to
It is designated as E:
E=(E1+E2+E3+ ... En)/n
Summed data in above formula does not include abnormal data Ei, data count n be summed data number and.
In step B, actual measuring center is the axis of rotation of rotor on rotor.
Turbine-generator units air gap status monitoring can monitor air gap in the application, both hydraulic generator rotor outer circle
The distance between stator inner circle.The monitoring of distance is realized as sampler using air gap sensors 2, sensor output
Be to apart from directly proportional voltage signal.When generator amature rotates one week (key is synchronised), every air gap sensors 2 and rotor
Corresponding air gap value is measured between every No.1 magnetic pole, is arranged in order and is constituted air gap figure.Rotor is calculated using minimum two-multiply law
Out-of-roundness.
Rotor often rotates a circle, and data measured by an air gap sensors 2 can calculate an out-of-roundness index, generally
For, each water turbine set can configure multiple air gap sensors 2 according to the difference of unit capacity and size, to revolve at one
The turn-week phase can measure the out-of-roundness index with air gap sensors 2 with quantity.Since air gap monitors system or the other operations of unit
Factor is used for early warning if we individually evaluate an out-of-roundness index, may have index accuracy not enough or miss
Alarm.Therefore we optimize on this basis, and Rye is introduced on the basis of multicycle index up to criterion to multiple parameter data
Do it is abnormal delete choosing processing, remaining index carries out more data feature values calculation methods again, not solve index accuracy not enough and not
Accurate bring false alarm has police not report, and improves the accuracy of out-of-roundness index algorithm.
The present invention specifically designs the following contents:
(1) installation of air gap sensors 2
As described in Figure 1: air gap sensors 2 are circumferentially evenly arranged, and are pasted on stator core inner wall, the quantity and cloth of measuring point
It sets and is determined according to parameters such as the pattern of hydrogenerator, capacity, size and stator core height, general stator core internal diameter is less than
4 are installed when 7.5m, install 8 when being more than or equal to 7.5m.Stator core height can be uniform at two layers of axial direction point when being greater than 2.75m
Arrangement.
As shown in Figure 1, the introducing of 1 key phase of key phase, allows us to extrapolate each air gap sensors 2 and exists
Which number magnetic pole is the corresponding air gap value that different moments are surveyed be.An air gap sensors 2 in a rotor swing circle
Measured air gap value comes out according to pole arrangement, has just obtained the profile that rotor rotates a circle.The waveform of air gap sensors 2 is defeated
Out as shown in Fig. 2, the gap in figure between arrow is exactly for we it will be seen that rotor magnetic pole successively passes through air gap sensors 2
To the air gap distance of air gap sensors 2, how many magnetic pole of rotor will generate corresponding magnetic pole in a swing circle
How many a air gaps, and be arranged successively.
(2) calculating of single out-of-roundness index
The definition of out-of-roundness, i.e. deviation from circular from: round shape deviates the degree of geometry circle.Its specific representation method be by
Actual profile is clipped between two concentric circles, and when the gap of this two geometry circle is minimum, the radius with the two geometry circle is only poor
To indicate the deviation from circular from of the profile.
Utilize the installation of air gap sensors 2, measurement.The profile that rotor rotates a circle has been obtained in we, utilizes minimum
Two multiply circule method, and we can calculate the Least Square Circle of the profile.Central coordinate of circle is determined, with actual measuring center (in rotor
Upper is exactly the axis of rotation of rotor) relative position, can determine the eccentricity and eccentric angle of rotor, can finally find out profile
On point and the center of circle of Least Square Circle between maximum distance Rmax and minimum range Rmin, the two values can be considered
The radius of above-mentioned two concentric circles, then this difference Ei is exactly the out-of-roundness of the profile.
Least Square Circle is an ideal circle, the principle for obtaining Least Square Circle be make from a point on profile to it is round away from
From quadratic sum it is minimum.
In above formula: Ri be practical outline to be measured on each point to least square center distance；
R is the radius of Least Square Circle；
According to British Standard and American National Standard, determine that the formula of Least Square Circle is as follows:
Above in formula, a, b and R are respectively the central coordinate of circle and radius of Least Square Circle.And every bit (x on profilei,
yi) it is exactly to be acquired according to the azimuth of surveyed air gap value and respective poles.
Principle by minimum two-multiply law Evaluation of Roundness Error is as shown in Figure 3；
The out-of-roundness Ei value such as following formula as can be seen that us is defined from Fig. 3 and deviation from circular from:
Ei=Rmax-Rmin (n of i=1,2,3 ...)
(3) composite accounting of out-of-roundness index
By upper it will be seen that working as generator amature during rotation, for each revolution, N number of air gap of installation is passed
It is E1, E2, E3 ... En that sensor 2, which will calculate N number of out-of-roundness index,.Rotor rotation takes two turns, and will generate 2*N out-of-roundness and refers to
Mark, is analogized with secondary.If using single out-of-roundness index as evaluation criterion, since air gap monitors system or unit other operations
Factor, it is understood that there may be situations such as individual index computational accuracies are not enough, data calculating is wrong causes false alarm or have police not report.For
The algorithm accuracy for improving out-of-roundness index avoids false alarm or has police not report, and then we are with 8 swing circles
Standard does integration algorithm to 8*N out-of-roundness index, finally obtains our out-of-roundness overall target E.
For 8*N out-of-roundness index, it is contemplated that there may be run it due to air gap condition monitoring device or unit
Measuring error caused by his factor, resulting achievement data are invalid, therefore we use Pauta criterion (3 σ standard
Abnormality value removing operation then) is carried out to achievement data first.Assuming that 8*N achievement data is E1, E2, E3, E4 ... En.It calculates
Its arithmetic mean of instantaneous value M and residual error Vi=Ei-M (i=1,2 ..., n), and standard deviation is calculated by Bessel Formula.Σ
Calculation formula is as follows
If meeting following formula
|Ei-M|>3σ
Then think that Ei is abnormal data, should reject.
The average value of remaining data after final calculating E1, E2, E2, E4 ... En rejecting abnormalities data Ei, is that we need
The comprehensive out-of-roundness index E of the generator amature wanted (referred to as comprehensive out-of-roundness index).Its formula is as follows
E=(E1+E2+E3+ ... En)/n
Illustrate: summed data in this formula does not include abnormal data Ei, data count n be summed data number and,
And not primary data number and.
Early warning is carried out by out-of-roundness index E, if E is less than or equal to rotor roundness tolerance standard, rotor roundness is qualified, if
E is greater than rotor roundness tolerance standard, then rotor roundness is unqualified, and issues warning information, instructs unit operations staff to unit
It checks or repairs, avoid the generation of unit operation major break down.
Invention effect:
The air gap between stator and rotor is acquired using air gap sensors 2, evaluates circularity using minimum two-multiply law
The method of error calculates multiple out-of-roundness indexs, using statistical theory, introduces to multiple out-of-roundness achievement datas abnormal
Data scalping method and arithmetic mean of instantaneous value extract batch data characteristic value, finally calculate the out-of-roundness index of our needs.
Out-of-roundness index pass through this optimization algorithm after, due to air gap monitoring system (such as some air gap sensors 2 loosen,
Some air gap sensors 2 precision itself not enough and certain road air gap signal conditioning circuit failure etc.) or unit other operation factors (ratios
As unit load amount is uprushed) the individual index measurement precision of bring are not enough and measuring error data will not influence out-of-roundness index
Accuracy in computation.Therefore the algorithm significantly improves the accuracy in computation of out-of-roundness index, avoids unit false alarm and refers to
The inaccurate situation of calculated result is marked, more accurate running state data support is provided for water turbine set safe operation, ensures machine
Group safe and stable operation.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should be included within the scope of the present invention within principle.
Claims (3)
1. a kind of hydroturbine rotor non-roundness measurement method, which comprises the following steps:
A, multiple air gap sensors are circumferentially evenly arranged, are pasted on stator core inner wall；One key phase is pasted
In stator core inner wall；Air gap value measured by an air gap sensors in one hydroturbine rotor swing circle is according to magnetic pole
Arrangement comes out, and has just obtained the profile that rotor rotates a circle；
B, the acquisition of single out-of-roundness index: rotor is calculated using minimum two-multiply law and is rotated a circle the least square of profile
Circle；It determines the relative position of central coordinate of circle Yu actual measuring center, the eccentricity and eccentric angle of rotor is determined with this, is finally asked
Point on profile and the maximum distance Rmax between the center of circle of Least Square Circle and minimum range Rmin out, by maximum distance Rmax
Make difference with minimum range Rmin and obtains the out-of-roundness that difference Ei is the profile；
C, the acquisition of comprehensive out-of-roundness index: hydroturbine rotor rotation is turned around, is measured by N number of air gap sensors of installation
N number of out-of-roundness index is E1, E2, E3 ... En；Hydroturbine rotor rotation is taken two turns, is surveyed by N number of air gap sensors of installation
2*N out-of-roundness index is measured, is analogized with secondary, multiple out-of-roundness indexs are obtained；Multiple out-of-roundness achievement datas are introduced again different
Regular data scalping method and arithmetic mean of instantaneous value extract batch data characteristic value, obtain comprehensive out-of-roundness index.
2. a kind of hydroturbine rotor non-roundness measurement method according to claim 1, it is characterised in that: single out-of-roundness refers to
It is designated as Ei, Ei=Rmax-Rmin (n of i=1,2,3 ...)；
N*N achievement data is E1, E2, E3, E4 ... En；
Calculate its arithmetic mean of instantaneous value M；
Calculating residual error Vi=Ei-M, (i=1,2 ..., n), calculate standard deviation by Bessel Formula；Σ calculation formula
It is as follows:
If meeting following formula
|Ei-M|>3σ
Then think that Ei is abnormal data, is rejected；
The average value of remaining data after calculating E1, E2, E2, E4 ... En rejecting abnormalities data Ei, i.e., comprehensive out-of-roundness index are
E:
E=(E1+E2+E3+ ... En)/n
Summed data in above formula does not include abnormal data Ei, data count n be summed data number and.
3. a kind of hydroturbine rotor non-roundness measurement method according to claim 1, it is characterised in that: practical in step B
Measuring center on rotor be rotor axis of rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910771543.6A CN110375684A (en) | 2019-08-21 | 2019-08-21 | A kind of hydroturbine rotor non-roundness measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910771543.6A CN110375684A (en) | 2019-08-21 | 2019-08-21 | A kind of hydroturbine rotor non-roundness measurement method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110375684A true CN110375684A (en) | 2019-10-25 |
Family
ID=68260126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910771543.6A Pending CN110375684A (en) | 2019-08-21 | 2019-08-21 | A kind of hydroturbine rotor non-roundness measurement method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110375684A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804117A (en) * | 2021-08-06 | 2021-12-17 | 天津大学 | System and method for measuring bore diameter of gun barrel rifling |
| CN113959381A (en) * | 2021-09-13 | 2022-01-21 | 华能澜沧江水电股份有限公司 | Method for reducing low-frequency vibration of stator of hydroelectric generator set |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05187815A (en) * | 1992-01-17 | 1993-07-27 | Tokyo Seimitsu Co Ltd | Roundness measuring apparatus and roundness measuring method |
| JPH07306004A (en) * | 1994-05-11 | 1995-11-21 | Ntn Corp | Shape measurement roller |
| CN103587549A (en) * | 2013-11-11 | 2014-02-19 | 南京理工大学 | Laser-sensor-based device and method for detecting out-of-roundness of wheels of urban rail vehicles |
| CN103831669A (en) * | 2014-03-20 | 2014-06-04 | 蒋峰 | Circular degree error online measurement system and measurement method |
| CN103954210A (en) * | 2014-05-21 | 2014-07-30 | 中国葛洲坝集团股份有限公司 | Automatic non-contact hydro-generator rotor roundness measuring device and method |
| CN104154853A (en) * | 2014-08-26 | 2014-11-19 | 上海瑞视仪表电子有限公司 | Method for measuring wind driven generator air gap through eddy current sensors |
| CN205156845U (en) * | 2015-11-10 | 2016-04-13 | 广东省水利水电科学研究院 | A capacitanc air gap sensor for water pump motor |
| CN108151669A (en) * | 2017-12-28 | 2018-06-12 | 长春长光精密仪器集团有限公司 | A kind of method of measuring roundness error and measuring system |
| CN108534740A (en) * | 2018-02-24 | 2018-09-14 | 南方电网调峰调频发电有限公司 | A kind of turbine-generator units stator thermal expansion dynamic method for monitoring and analyzing |
-
2019
- 2019-08-21 CN CN201910771543.6A patent/CN110375684A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05187815A (en) * | 1992-01-17 | 1993-07-27 | Tokyo Seimitsu Co Ltd | Roundness measuring apparatus and roundness measuring method |
| JPH07306004A (en) * | 1994-05-11 | 1995-11-21 | Ntn Corp | Shape measurement roller |
| CN103587549A (en) * | 2013-11-11 | 2014-02-19 | 南京理工大学 | Laser-sensor-based device and method for detecting out-of-roundness of wheels of urban rail vehicles |
| CN103831669A (en) * | 2014-03-20 | 2014-06-04 | 蒋峰 | Circular degree error online measurement system and measurement method |
| CN103954210A (en) * | 2014-05-21 | 2014-07-30 | 中国葛洲坝集团股份有限公司 | Automatic non-contact hydro-generator rotor roundness measuring device and method |
| CN104154853A (en) * | 2014-08-26 | 2014-11-19 | 上海瑞视仪表电子有限公司 | Method for measuring wind driven generator air gap through eddy current sensors |
| CN205156845U (en) * | 2015-11-10 | 2016-04-13 | 广东省水利水电科学研究院 | A capacitanc air gap sensor for water pump motor |
| CN108151669A (en) * | 2017-12-28 | 2018-06-12 | 长春长光精密仪器集团有限公司 | A kind of method of measuring roundness error and measuring system |
| CN108534740A (en) * | 2018-02-24 | 2018-09-14 | 南方电网调峰调频发电有限公司 | A kind of turbine-generator units stator thermal expansion dynamic method for monitoring and analyzing |
Non-Patent Citations (7)
| Title |
|---|
| 徐兰英: "《现代传感与检测技术》", 30 April 2015 * |
| 曹俊丽等: "基于莱特准则的椭圆拟合优化算法", 《计算机应用》 * |
| 曾文志等: "发电机定、转子间气隙的计算方法", 《日用电器》 * |
| 李德忠等: "基于MATLAB的水电机组气隙数据分析处理", 《水力发电》 * |
| 肖孝锋: "水轮发电机组气隙状态监测***的实现", 《江西电力》 * |
| 苏鑫等: "水轮发电机组气隙监测***实现及其在五强溪电厂应用前景浅析", 《湖南水利水电》 * |
| 麻志成等: "水轮发电机空气间隙平均值计算方法及应用", 《水电厂自动化》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804117A (en) * | 2021-08-06 | 2021-12-17 | 天津大学 | System and method for measuring bore diameter of gun barrel rifling |
| CN113959381A (en) * | 2021-09-13 | 2022-01-21 | 华能澜沧江水电股份有限公司 | Method for reducing low-frequency vibration of stator of hydroelectric generator set |
| CN113959381B (en) * | 2021-09-13 | 2024-05-10 | 华能澜沧江水电股份有限公司 | Method for reducing stator low-frequency vibration of hydroelectric generating set |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106769039B (en) | A kind of mounting assembly suitable for the monitoring of rolling bearing rotary part | |
| CN105891546B (en) | The method of wind vane fault diagnosis in Wind turbines yaw system based on big data | |
| CN110375684A (en) | A kind of hydroturbine rotor non-roundness measurement method | |
| CN109488630B (en) | Centrifugal fan rotor misalignment fault diagnosis method based on harmonic relative index | |
| CN104142229A (en) | Online wind turbine generator system flange bolt monitoring and failure diagnosis system | |
| CN208505207U (en) | A kind of device for the measurement of pneumatic pump mechanical trip flyball fitting depth | |
| CN112729681A (en) | Detection method and detection system for rotor field dynamic balance | |
| CN107084843A (en) | A kind of shaft vibration monitoring method and device | |
| CN106767501B (en) | A method of measurement large cylinder circularity | |
| CN102095561B (en) | Falling fault positioning method for rotating part of large-size steam turbine | |
| CN114333252A (en) | Draining pump operation monitoring and early warning system based on big data | |
| CN104990670A (en) | Adjusting method of built-in mechanical on-line dynamic balancing system of main shaft | |
| CN102478459A (en) | Method and device for monitoring bearing failure of power generator | |
| CN110285955A (en) | Top cover of hydraulic turbine set bolt and nut loosens detection device and method | |
| CN103217545A (en) | Method for judging fault tolerance and abnormality of rotating speed signal of synchronous motor | |
| CN103399165A (en) | Large wind turbine unit rotary detecting device | |
| CN111044277A (en) | Fault diagnosis system and method for pump station unit | |
| CN203405471U (en) | A rotation detecting apparatus of a large wind-driven generator set | |
| CN106949939B (en) | Gas turbine flowmeter with double high-frequency detection | |
| Zhang et al. | Complexity analysis of distributed measuring and sensing network in multistage machining processes | |
| CN203177825U (en) | Turbine separator groove center measuring device | |
| CN108398263A (en) | Steel rolling reducer with operation health self-test function | |
| CN209340188U (en) | A kind of centrifugal fan sensory perceptual system | |
| CN106033018A (en) | Onsite dynamic balancing method needless of trial weighting and system for realizing method | |
| CN105180860B (en) | A kind of online compensation formula rotor pulsation measurement system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: Huaneng building, No.47, section 4, Renmin South Road, Wuhou District, Chengdu, Sichuan 610000 Applicant after: Huaneng Sichuan Energy Development Co.,Ltd. Applicant after: BEIJING ORIENTGE TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. Address before: Huaneng building, No.47, section 4, Renmin South Road, Wuhou District, Chengdu, Sichuan 610000 Applicant before: Huaneng Sichuan Hydropower Co.,Ltd. Applicant before: BEIJING ORIENTGE TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191025 |
|
| RJ01 | Rejection of invention patent application after publication |