CN109029695A - It is a kind of to consider the big axis revolution of the hydraulic turbine simultaneously and run throw calculation method under rotation - Google Patents
It is a kind of to consider the big axis revolution of the hydraulic turbine simultaneously and run throw calculation method under rotation Download PDFInfo
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- CN109029695A CN109029695A CN201811089398.5A CN201811089398A CN109029695A CN 109029695 A CN109029695 A CN 109029695A CN 201811089398 A CN201811089398 A CN 201811089398A CN 109029695 A CN109029695 A CN 109029695A
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- big axis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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Abstract
The invention belongs to vibration throw technical fields, more particularly to one kind to consider the big axis revolution of the hydraulic turbine simultaneously and run throw calculation method under rotation.This method comprises the following steps: multipair eddy current sensor S1, is installed on big axis, for a big axis of electric vortex sensor measuring in every a pair of eddy current sensor along the offset of its own radial direction, another measures big axis along the offset of itself vertical radial direction；S2, rotation center is obtained around unit centre relative rotation angular speed angle (θ1) and big axis geometric center around rotation center relatively rotate angular speed angle (θ2)；S3, the offset according to measured by multiple eddy current sensors obtain main shaft runout value in the component of X-axis, Y-axis.This method is in the throw measurement for considering to obtain axis greatly in the case where rotation center variation.
Description
Technical field
The invention belongs to vibration throw technical fields, more particularly to one kind is considered under the big axis revolution of the hydraulic turbine and rotation simultaneously
Run throw calculation method.
Background technique
In engineering practice, the stable operation of the big axis of turbine-generator units is wanting substantially for Hydropower Unit safe and stable operation
It asks." GB/T 8564-2003 water-turbine unit technical specification " 7.4.4 item regulation " before water pilot bearing installation, Ying Jin
The inspection of row unit axis, unit axis should meet design requirement "." GB/T 8564-2003 water-turbine unit technology
Specification " 7.4.3 item regulation " major axis horizontal or vertical missing should not exceed 0.02mm/m ", " when the hydraulic turbine or generator are by material object
When centering, center and the main shaft that should adjust runner are vertical, its gap of seal ring is made to meet 5.4.2 item requirement, and main shaft verticality is inclined
Difference should not exceed 0.02mm/m ".
On stricti jurise, on the one hand big axis surrounds itself rotation, while being still around rotation center rotation.Big axis surrounds certainly
During body rotates, the bolt of shaft coupling flange bears pressure, and shaft coupling pin transmits torque and bears shearing.Geometric center surrounds
Rotation center rotary course, unit axis are rotated entirely around rotation center, will after unit axis inclination, tortuous sufficiently large
Cause big axis to swing bigger than normal, unit vibration to become larger.In view of rotation center is dynamic change in actual motion, in order to more force
Nearly actual conditions have studied throw under rotation center arbitrary trajectory herein and measure.
Summary of the invention
(1) technical problems to be solved
For existing technical problem, the present invention provides a kind of while considering the big axis revolution of the hydraulic turbine and transporting under rotation
Row throw calculation method, in the throw measurement for considering to obtain axis greatly in the case where rotation center variation.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
It is a kind of to consider the big axis revolution of the hydraulic turbine simultaneously and run throw calculation method under rotation, assuming that meeting simultaneously as follows
In the case where condition:
Condition 1, turbine-generator units big shaft section be absolute circle, and section Mass Distribution is uniform, the matter in section
The heart is overlapped with geometric center；
The orbit of shaft center of turbine-generator units is arbitrary curve under condition 2, steady-state operation, the weight under different rotation periods
It closes；
Condition 3, eddy current sensor different rotation angle, but be distributed across on the same circumference；
The calculation method includes the following steps:
S1, multipair eddy current sensor, a current vortex in every a pair eddy current sensor are installed on the big axis
For the big axis of sensor measurement along the offset of its own radial direction, another measures big axis along the offset of itself vertical radial direction
Amount；
S2, rotation center is obtained around unit centre relative rotation angular speed angle (θ1) and big axis geometric center around rotation
Turn center and relatively rotates angular speed angle (θ2)；
S3, the offset according to measured by multiple eddy current sensors obtain main shaft runout value in X-axis, Y-axis according to following formula
Component:
In formula: exIndicate big axis in +X direction throw value；eyIndicate big axis in +Y direction throw value；e1Indicate unit centre
To the distance of rotation center；e2Distance of the expression rotation center to big axis geometric center.
Further, the eddy current sensor is mounted on the axial plane of big axis by mounting bracket and base support, and institute
It is identical with the rigidity of base support to state mounting bracket.
Further, the contact surface that the eddy current sensor is contacted perpendicular to eddy current sensor and big axis.
(3) beneficial effect
The beneficial effects of the present invention are: provided by the invention while considering the revolution of turbine-generator units big axis and being transported under rotation
Row throw calculation method considers the dynamic change of big axis rotation center, proposes practical axle center rail under rotation center arbitrary curve
Mark throw calculation method, and the throw calculation method system for approaching practical big axis operating status is established by theory deduction, with
Analytic process is carried out for typical orbit of shaft center.Theoretical basis is provided for the analysis of throw signal, is vibrated to Hydropower Unit is improved
Throw on-line monitoring system, improving Hydropower Unit status monitoring and fault diagnosis level has weight engineering application value.
Detailed description of the invention
Fig. 1 is that main shaft runout schematic diagram under big axis revolution and rotation is considered in the embodiment of the present invention；
Fig. 2 is rotation geometric center circus movement-revolution center elliptic motion Chart of axes track in the embodiment of the present invention；
Fig. 3 is rotation geometric center circus movement-revolution center elliptic motion+X+Y throw waveform in the embodiment of the present invention
Figure.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
Before being derived, assumes initially that the present embodiment while meeting following condition:
Condition 1, turbine-generator units big shaft section be absolute circle, and section Mass Distribution is uniform, the matter in section
The heart is overlapped with geometric center.
Engineering requires in measurement process throw sensor mounting location should be close to finishing shaft position in practice, while big axis
The circularity of section circle should meet standard requirements, therefore, big axis shape can be assumed in theory deduction.
With the raising of machining accuracy, the quality of big axis is generally distributed more uniformly.The present invention ignores Mass Distribution for the time being
The influence that throw is calculated.
The orbit of shaft center of turbine-generator units is arbitrary curve under condition 2, steady-state operation, the weight under different rotation periods
It closes.
Actual eddy current sensor installation site is influenced by sensor stand and pedestal rigidity in engineering, with unit
The phenomenon that fixed part vibrates together, and the orbit of shaft center of unit is not overlapped there is also the period.By diameter in the big axis rotation of unit
To the influence of support watt, the rotation center of big axis further aggravates the repetition of orbit of shaft center there is deviating, rotating
Property is poor.For demand is simplified, the present invention ignores the factors such as sensor stand and uneven, the rotation center pivot offset of pedestal rigidity
Influence, it is assumed that the orbit of shaft center of arbitrary curve can be overlapped under different cycles.
Condition 3, eddy current sensor different rotation angle, but be distributed across on the same circumference.
In practice since installation influences, sensor rotation is reinstalled after crossing certain angle, potential range rotation center
Distance changes.Different rotary angle lower sensor peace can actually be reduced as far as possible by controlling sensor mounting process
Fill deviation.Therefore the present invention ignores the influence of the factor.
In the case where assumed condition 1-3 as above meets simultaneously, the derivation process of the present embodiment is as follows:
As shown in Figure 1, if ignoring the movement of rotation center, this when to inscribe big axis in the throw of X-direction be straight line AB,
The throw of big axis is straight line LN in the Y direction；If it is considered that the movement of rotation center, then this when inscribe big axis in the throw of X-direction
It is straight line C'B', the throw of big axis is straight line M'N' in the Y direction.Therefore, it in the case where considering the movement of rotation center, finds out
The throw of big axis is to find out straight line C'B' and straight line M'N', and derivation process is as follows:
In formula: exIndicate big axis in +X direction throw value；eyIndicate big axis in +Y direction throw value.
In formula:θ1For O1O2With with O1Centered on coordinate system under XOY X-axis angle；θ2
For O2O3With with O2Centered on coordinate system under X ' OY ' X ' axis angle；R is big axis radius.
In view of rotation center O2To unit centre O1Distance be substantially that (10 μm) are other, big axis geometric center O3It arrives
Rotation center O2Be also road (10 μm) rank, so when big axis can simplify in the throw of X-axis and Y-axis are as follows:
Wherein, big axis geometric center O3Around big axis geometric center O3Movement be that rotation/1st grade relatively rotates, big axis is several
What center O3Around rotation center O2Movement be revolution/the 2 grade relative rotation, rotation center O2Around unit centre O1Rotation
Switch to 3rd level relative rotation, 3rd level relative rotation motion of driving system form is unknown.It is worth noting that the eccentric distance e in formula (1)1、e2Its
Amplitude is time-varying.
Throw at big shaft section it can be seen from formula (3) depends on rotation center O when 3rd level relatively rotates2Track
Big axis geometric center O when with revolution3Track, practical orbit of shaft center is formed under the two orbit of shaft center comprehensive function, such as Fig. 2 institute
Show.
The throw that rotation generates when big axis rotation shows as circle can be expressed as formula (4):
The throw that rotation generates when the revolution of big axis shows as ellipse can be expressed as formula (5):
Throw calculation expression after synthesis is formula (6):
Wherein, if a=200 μm, b=50 μm, e2=100 μm, θ1=0~2 π, θ2=0~2 π, it is 0, pi/ that a, which is respectively set,
6, pi/4, then corresponding X-axis, Y-axis throw measured waveform are as shown in Figure 3.
Preferably, eddy current sensor is mounted on the axial plane of big axis by mounting bracket and base support, and mounting bracket
It is identical with the rigidity of base support.
Ignore the difference of the mounting bracket rigidity of eddy current sensor and the rigidity of base support.The survey of throw in engineering practice
Amount is closely related with the installation of eddy current sensor, and eddy current sensor is often mounted on the angle bar frame of custom-made in practice,
And angle bar frame is pasted on oil tray cover board or pedestal by specific glue.In practice since firm pasting degree is different, oil tray
Cover board, which exists, divides the factors such as valve, and the rigidity and Oscillation Amplitude of pedestal are also different.In order to simplify problem, the present invention temporarily ignore this because
The influence of element.
Preferably, the contact surface that eddy current sensor is contacted perpendicular to eddy current sensor and big axis.
Ignore big axis it is static and movement in eddy current sensor detecting head surface and big axis surface inclination, it is assumed that eddy current sensor
Detecting head surface and big axis contact surface are completely vertical.The sensor of actual installation depends on experience abundant, it is ensured that vortex passes
Sensor detecting head surface is vertical with big shaft section, and the present invention does not consider the influence of the factor temporarily.
To sum up, provided in this embodiment while considering the revolution of turbine-generator units big axis and running throw calculating side under rotation
Method considers the dynamic change of big axis rotation center, proposes practical orbit of shaft center throw calculating side under rotation center arbitrary curve
Method, and the throw calculation method system for approaching practical big axis operating status is established by theory deduction, with typical orbit of shaft center
For carry out analytic process.Theoretical basis is provided for the analysis of throw signal, is monitored on-line to Hydropower Unit vibration throw is improved
System, improving Hydropower Unit status monitoring and fault diagnosis level has weight engineering application value.
The technical principle of the invention is described above in combination with a specific embodiment, these descriptions are intended merely to explain of the invention
Principle shall not be construed in any way as a limitation of the scope of protection of the invention.Based on explaining herein, those skilled in the art
It can associate with other specific embodiments of the invention without creative labor, these modes fall within this hair
Within bright protection scope.
Claims (3)
1. a kind of consider the big axis revolution of the hydraulic turbine simultaneously and run throw calculation method under rotation, which is characterized in that
Assuming that meeting following condition simultaneously:
Condition 1, turbine-generator units big shaft section be absolute circle, and section Mass Distribution is uniform, the mass center in section with
Geometric center is overlapped；
The orbit of shaft center of turbine-generator units is arbitrary curve under condition 2, steady-state operation, is overlapped under different rotation periods；
Condition 3, eddy current sensor different rotation angle, but be distributed across on the same circumference；
The calculation method includes the following steps:
S1, multipair eddy current sensor is installed on the big axis, the current vortex sensing in every a pair eddy current sensor
Device measures big axis along the offset of its own radial direction, another measures big axis along the offset of itself vertical radial direction；
S2, rotation center is obtained around unit centre relative rotation angular speed angle (θ1) and big axis geometric center around rotation in
The heart relatively rotates angular speed angle (θ2)；
S3, the offset according to measured by multiple eddy current sensors obtain main shaft runout value in point of X-axis, Y-axis according to following formula
Amount:
In formula: exIndicate big axis in +X direction throw value；eyIndicate big axis in +Y direction throw value；e1Indicate unit centre to rotation
Turn the distance at center；e2Distance of the expression rotation center to big axis geometric center.
2. it is according to claim 1 while considering the revolution of the hydraulic turbine big axis and running throw calculation method under rotation, it is special
Sign is that the eddy current sensor is mounted on the axial plane of big axis by mounting bracket and base support, and the mounting bracket
It is identical with the rigidity of base support.
3. it is according to claim 1 while considering the revolution of the hydraulic turbine big axis and running throw calculation method under rotation, it is special
Sign is, the contact surface that the eddy current sensor is contacted perpendicular to eddy current sensor and big axis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811089398.5A CN109029695A (en) | 2018-09-18 | 2018-09-18 | It is a kind of to consider the big axis revolution of the hydraulic turbine simultaneously and run throw calculation method under rotation |
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|---|---|---|---|
| CN201811089398.5A CN109029695A (en) | 2018-09-18 | 2018-09-18 | It is a kind of to consider the big axis revolution of the hydraulic turbine simultaneously and run throw calculation method under rotation |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040015326A1 (en) * | 2002-07-19 | 2004-01-22 | Keith Bluestein | Computerized electronic runout |
| CN102168966A (en) * | 2010-11-22 | 2011-08-31 | 李正才 | Axis swing monitoring system for water-turbine generator set |
| CN103240592A (en) * | 2013-04-11 | 2013-08-14 | 中国葛洲坝集团股份有限公司 | Method for accurately determining rotating center of turning engine unit of water-turbine generator unit |
| CN103245283A (en) * | 2013-04-11 | 2013-08-14 | 中国葛洲坝集团股份有限公司 | Method for accurately and continuously measuring and processing axis throw of hydraulic turbine set |
| CN108412660A (en) * | 2018-02-24 | 2018-08-17 | 南方电网调峰调频发电有限公司 | A method of passing through analysis of orbit turbine-generator units bearing shell state |
-
2018
- 2018-09-18 CN CN201811089398.5A patent/CN109029695A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040015326A1 (en) * | 2002-07-19 | 2004-01-22 | Keith Bluestein | Computerized electronic runout |
| CN102168966A (en) * | 2010-11-22 | 2011-08-31 | 李正才 | Axis swing monitoring system for water-turbine generator set |
| CN103240592A (en) * | 2013-04-11 | 2013-08-14 | 中国葛洲坝集团股份有限公司 | Method for accurately determining rotating center of turning engine unit of water-turbine generator unit |
| CN103245283A (en) * | 2013-04-11 | 2013-08-14 | 中国葛洲坝集团股份有限公司 | Method for accurately and continuously measuring and processing axis throw of hydraulic turbine set |
| CN108412660A (en) * | 2018-02-24 | 2018-08-17 | 南方电网调峰调频发电有限公司 | A method of passing through analysis of orbit turbine-generator units bearing shell state |
Non-Patent Citations (1)
| Title |
|---|
| 王浩 等: "立式水轮发电机组轴线摆度的几何分析", 《科技创新导报》 * |
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Application publication date: 20181218 |