CN110849414B - Method, device and equipment for identifying bending direction of rotor and storage medium - Google Patents
Method, device and equipment for identifying bending direction of rotor and storage medium Download PDFInfo
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- CN110849414B CN110849414B CN201911049143.0A CN201911049143A CN110849414B CN 110849414 B CN110849414 B CN 110849414B CN 201911049143 A CN201911049143 A CN 201911049143A CN 110849414 B CN110849414 B CN 110849414B
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a method, a device, equipment and a storage medium for identifying the bending direction of a rotor, wherein the method comprises the following steps: when the rotor is in a turning state or rotates at a low rotating speed, detecting a pulse voltage signal synchronous with a rotating period through a phase discrimination sensor, detecting a shaft vibration voltage signal changing with the surface clearance of the rotor through a shaft vibration sensor measuring shaft vibration, obtaining a rotating period T of the rotor through the pulse voltage signal obtained by the phase discrimination sensor, and carrying out Fourier change on the shaft vibration voltage signal on the rotating period T of the rotor to obtain a sine wave signal synchronous with the rotating period T of the rotor and consistent with the period; obtaining the time information of a positive peak lagging phase discrimination signal of a sine wave component with the same rotation frequency as the rotor in the sine wave signal; and determining the bending direction of the rotor according to the time information, thereby realizing the identification of the bending direction of the rotor.
Description
Technical Field
The invention relates to the technical field of monitoring of a rotor of a steam turbine generator unit, in particular to a method, a device, equipment and a storage medium for identifying the bending direction of the rotor.
Background
The rotor of the turbo generator set consists of a high-pressure rotor of a steam turbine, a medium-pressure rotor, a low-pressure rotor, a generator rotor, a short shaft of a collecting ring or an exciter rotor, and an approximately linear shaft system is formed by connecting the high-pressure rotor, the medium-pressure rotor, the low-pressure rotor, the generator rotor, the short shaft of the collecting ring or the exciter rotor through a coupler, and in the actual work of the turbo generator set, the working conditions of the rotors at all sections are greatly different; the low-pressure rotor has large temperature difference, and the rotor part of the low-pressure rotor is in a high-humidity and negative-pressure environment; the rotor of the generator set is provided with a tooth-shaped groove for arranging the magnet exciting coil, and the magnet exciting coil can generate uneven heat in the working process.
In practice, the turbonator rotor often produces deformation because of the gravity effect of long-term stillness, the impact of cold vapour and cold water, various reasons such as coil heating is inhomogeneous, make the rotor become not a straight line, produce certain bending promptly, there is crooked rotor, can produce centrifugal force because of crooked high point and rotation center decentraction at rotatory in-process, under the effect of this centrifugal force, the rotor bending further aggravates, and then takes place the serious accident of sound collision friction, strong vibration, cause turbo generator set unable normal start or operation.
At present, a large steam Turbine generator unit monitors rotor bending through eccentricity configured in a Turbine monitoring device (TSI), the measuring device can only reflect the size of the rotor bending, the rotor bending is actually a vector with direction and size, and the bending state of the rotor is changed even if the bending value is unchanged and the bending direction is changed in an extreme state, so that the purpose of accurately monitoring the rotor bending condition cannot be achieved by the existing eccentricity monitoring system.
Disclosure of Invention
The invention mainly aims to provide a method, a device, equipment and a storage medium for identifying the bending direction of a rotor, and aims to solve the problem of monitoring the bending direction of the rotor in a turning state of the rotor.
In order to achieve the above object, the present invention provides a method for identifying a bending direction of a rotor, including the steps of:
when the rotor is in a turning state or rotates at a low rotating speed, a pulse voltage signal synchronous with a rotating period is detected through a phase discrimination sensor, the pulse voltage signal is triggered once per rotation, and the phase discrimination sensor is arranged at a first distance from the rotor;
detecting a shaft vibration voltage signal changing with the surface clearance of the rotor through a shaft vibration sensor measuring shaft vibration, wherein the shaft vibration sensor is arranged at a second distance away from the rotor;
obtaining a rotor rotation period T through a pulse voltage signal obtained by a phase discrimination sensor, and carrying out Fourier change on the shaft vibration voltage signal on the rotor rotation period T to obtain a sine wave signal which is synchronous with the rotor rotation period T and has the same period;
defining the angle of one rotation to obtain the time information of a positive peak lag phase discrimination signal of a sine wave component with the same rotation frequency as the rotor in the sine wave signal;
and determining the bending angle information of the rotor according to the time information, and identifying the bending direction of the rotor according to the bending angle information.
Preferably, the rotor is provided with a phase identifying groove;
when the rotor is in the barring state or low rotational speed rotates, detect the pulse voltage signal synchronous with the rotation cycle through phase discrimination sensor, include:
when the rotor is in a turning state or rotates at a low rotating speed, the phase discrimination sensor detects the change of the distance between the rotor and the surface of the rotor, and when the rotor rotates to the position of a phase discrimination groove, the pulse signal with the same rotation period as the rotor is obtained;
and generating the pulse voltage signal by using the pulse signal with the same rotation period as the rotor and the relatively stable voltage signal output by the phase discrimination sensor.
Preferably, the detecting a shaft vibration voltage signal varying with a rotor surface gap by a shaft vibration sensor measuring shaft vibration includes:
and detecting the change of the clearance between the rotor surface and the shaft vibration sensor for measuring the shaft vibration to obtain a voltage signal related to the rotor bending value, and taking the voltage signal related to the rotor bending value as a shaft vibration voltage signal.
Preferably, the obtaining of the rotor rotation period T from the pulse voltage signal obtained by the phase discrimination sensor, and performing fourier transform on the shaft vibration voltage signal in the rotor rotation period T to obtain a sine wave signal which is synchronous with and has a consistent period with the rotor rotation period T includes:
acquiring a rotor bending value and phase angle information;
and carrying out Fourier change on the shaft vibration signal on the rotor rotation period T according to the rotor rotation period, the rotor bending value and the phase angle information to obtain a sine wave signal which is synchronous with the rotor rotation period T and has the same period.
Preferably, the shaft vibration signal is subjected to fourier transform on the rotor rotation period T according to the rotor rotation period, the rotor bending value and the phase angle information by using the following formula, so as to obtain a sine wave signal which is synchronous with the rotor rotation period T and has a consistent period:
wherein t represents time, x (t) represents the shaft vibration signal, and x0Is a constant, n is an integer, 2 pi is a constant, AnRepresenting a single peak of each sine wave signal, T representing the rotor rotation period measured from the phase-discriminated signal, phinPhase angle information of each sine wave signal is represented.
Preferably, the defining an angle of one rotation to obtain time information of a positive peak lag phase detection signal of a sine wave component in the sine wave signal, which has the same rotation frequency as the rotor, includes:
and defining an angle of one rotation, and comparing the pulse triggering time of the pulse voltage signal with a positive peak of a sine wave signal which is obtained after Fourier change and has the same rotation period as the rotor to obtain time information of a positive peak lagging phase discrimination signal of a sine wave component which has the same rotation frequency as the rotor in the sine wave signal.
Preferably, the determining bending angle information of the rotor according to the time information, and identifying a bending direction of the rotor by the bending angle information, includes:
determining bending angle information of the rotor according to the rotation period of the rotor and the time information;
identifying the bending direction of the rotor according to the bending angle information, the circumferential arrangement relation of the phase discrimination sensor and the shaft vibration sensor and the position of the phase discrimination groove for measuring a phase discrimination signal on the rotor;
correspondingly, the determining the bending angle information of the rotor according to the rotation period of the rotor and the time information includes:
and dividing the time information by the time of the whole sampling period, multiplying the time information by the angle of one rotation to obtain the angle representing the bending direction of the rotor, and identifying the bending direction of the rotor by the angle representing the bending direction of the rotor.
In order to achieve the above object, the present invention also provides a device for identifying a bending direction of a rotor, including:
the detection module is used for detecting a pulse voltage signal synchronous with a rotation period through a phase discrimination sensor when the rotor is in a turning state or rotates at a low rotation speed, the pulse voltage signal is triggered once per rotation of one circle, and the phase discrimination sensor is arranged at a first distance from the rotor;
the detection module is also used for detecting a shaft vibration voltage signal changing with the surface clearance of the rotor through a shaft vibration sensor for measuring shaft vibration, and the shaft vibration sensor is arranged at a second distance away from the rotor;
the conversion module is used for obtaining a rotor rotation period T through a pulse voltage signal obtained by the phase discrimination sensor, and carrying out Fourier change on the shaft vibration voltage signal on the rotor rotation period T to obtain a sine wave signal which is synchronous with the rotor rotation period T and has the same period;
the acquisition module is used for defining the angle of one rotation to obtain the time information of a positive peak lag phase demodulation signal of a sine wave component with the same rotation frequency as the rotor in the sine wave signal;
and the identification module is used for determining the bending angle information of the rotor according to the time information and identifying the bending direction of the rotor according to the bending angle information.
Further, to achieve the above object, the present invention also proposes an apparatus for identifying a bending direction of a rotor, comprising: the identification program of the rotor bending direction is configured to realize the steps of the identification method of the rotor bending direction.
Furthermore, in order to achieve the above object, the present invention further proposes a storage medium having stored thereon a program for identifying a bending direction of a rotor, which when executed by a processor implements the steps of the method for identifying a bending direction of a rotor as described above.
The invention provides a method for identifying the bending direction of a rotor, which comprises the steps that when the rotor rotates in a turning state or a low-rotating-speed state, a phase discrimination sensor is used for measuring the rotor with a phase discrimination groove, when the phase discrimination groove passes through the sensor, a pulse signal is generated, the phase discrimination sensor outputs a voltage signal with a pulse, the triggering period of the pulse is the same as the rotating period of the rotor, and the phase discrimination sensor is arranged at a position away from the rotor by a first distance; detecting the surface of the rotor through a shaft vibration sensor, wherein the output voltage value of the shaft vibration sensor changes along with the change of a gap between the shaft vibration sensor and the surface of the rotor in the rotation process of the rotor, the output voltage signal of the shaft vibration sensor comprises shaft vibration signals of information such as the bending value of the rotor, the smoothness of the surface of the rotor, the unevenness of a magnetic material and the like, and the shaft vibration sensor is arranged at a second distance from the rotor; obtaining the rotation period of the rotor according to the voltage signal with the pulse; performing Fourier transform on the shaft vibration signal with a period being the rotation period of the rotor to obtain a sinusoidal signal with the same rotation period as the rotor; obtaining time information of a sine signal positive peak lagging pulse signal; and determining the bending angle information of the rotor according to the time information, and identifying the bending direction of the rotor according to the bending angle information. The method comprises the steps that a pulsed voltage signal triggered by a phase detection groove in a rotor and a shaft vibration signal measured by a shaft vibration sensor are acquired through a phase detection sensor, the peak value of a sinusoidal signal with the same rotation period as the rotor in a shaft vibration limit signal is delayed from pulse signal pulse time information, a phase angle is obtained according to the relation between the time information and the rotation period of the rotor, the bending direction of the rotor is monitored according to the phase angle, and the monitoring precision of the rotor is improved.
Drawings
FIG. 1 is a schematic diagram of an apparatus architecture of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a first embodiment of a method for identifying a bending direction of a rotor according to the present invention;
FIG. 3 is a schematic view of a turbine rotor and its TSI testing system according to an embodiment of the method for identifying a bending direction of the rotor of the present invention;
FIG. 4 is a flow chart illustrating a method for identifying a bending direction of a rotor according to a second embodiment of the present invention;
fig. 5 is a schematic view of a phase discrimination sensor measurement principle according to an embodiment of the method for identifying a rotor bending direction of the present invention;
FIG. 6 is a schematic diagram illustrating a principle of a shaft vibration measurement signal according to an embodiment of the method for identifying a bending direction of a rotor of the present invention;
FIG. 7 is a flow chart illustrating a method for identifying a bending direction of a rotor according to a third embodiment of the present invention;
fig. 8 is a schematic diagram of a standard sine wave signal obtained by fourier transform according to a phase-discriminated periodic signal in an embodiment of the method for identifying a rotor bending direction of the present invention;
fig. 9 is a schematic diagram illustrating a comparison between a phase detection signal and a standard sine wave according to an embodiment of the method for identifying a bending direction of a rotor according to the present invention;
fig. 10 is a functional block diagram of a first embodiment of an apparatus for identifying a bending direction of a rotor according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic device structure diagram of a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may comprise a Display screen (Display), an input unit such as keys, and the optional user interface 1003 may also comprise a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The Memory 1005 may be a Random Access Memory (RAM) or a non-volatile Memory (e.g., a disk Memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration of the apparatus shown in fig. 1 is not intended to be limiting of the apparatus and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a storage medium, may include therein an operating system, a network communication module, a user interface module, and a rotor bending direction recognition program.
In the device shown in fig. 1, the network interface 1004 is mainly used for connecting an external network and performing data communication with other network devices; the user interface 1003 is mainly used for connecting user equipment and performing data communication with the equipment; the device of the present invention calls the identification program of the rotor bending direction stored in the memory 1005 by the processor 1001, and executes the implementation method of the identification of the rotor bending direction provided by the embodiment of the present invention.
Based on the hardware structure, the embodiment of the identification method of the rotor bending direction is provided.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for identifying a bending direction of a rotor according to a first embodiment of the present invention.
In a first embodiment, the method for identifying the bending direction of the rotor includes the following steps:
step S10, when the rotor is in the turning state or rotating at a low rotating speed, the pulse voltage signal synchronous with the rotating period is detected through a phase discrimination sensor, the pulse voltage signal is triggered once per rotation of one circle, and the phase discrimination sensor is arranged at a position away from the rotor by a first distance.
When rotor barring state or low-speed rotation, the measurement has the rotor of phase discrimination groove, can produce a pulse signal when the phase discrimination groove passes through the sensor, and phase discrimination sensor output one has the voltage signal of pulse, and the trigger cycle of pulse is the same with rotor rotation cycle, phase discrimination sensor locate with the rotor is apart from first distance department.
It should be noted that, the executing main body of the embodiment is identification equipment for the bending direction of the rotor, and may also be other equipment capable of achieving the same or similar functions.
As shown in fig. 3, the schematic diagram of a steam turbine rotor and its TSI testing system is that the steam turbine generator rotor is composed of a high-pressure section, a medium-pressure section, a low-pressure section, a generator section, and an exciter section, each section of the steam turbine rotor is supported by 2 bearings, the generator section rotor and the exciter section rotor are supported by 3 bearings, and there are 9 bearings. A phase discrimination sensor and an off-center shaft vibration sensor are arranged in the front of the rotor, the phase discrimination sensor and the shaft vibration sensor can detect the front curvature of the rotor and the increased bending direction of the rotor, wherein X and Y respectively represent two orthogonal shaft vibration sensors for measuring the vibration of the rotor at each bearing, A represents the phase discrimination sensor, and B represents the shaft vibration sensor.
The phase discrimination sensor is used for measuring a rotor with a phase discrimination groove, when the phase discrimination groove passes through the sensor, a pulse signal can be generated, the phase discrimination sensor outputs a voltage signal with a pulse, the triggering period of the pulse is the same as the rotation period of the rotor, and the phase discrimination sensor is arranged at a first distance from the rotor; the rotor surface is detected by the shaft vibration sensor, the output voltage value of the shaft vibration sensor changes along with the change of the gap between the shaft vibration sensor and the rotor surface in the rotation process of the rotor, and the output voltage signal of the shaft vibration sensor comprises the shaft vibration signal of information such as the bending value of the rotor, the poor smoothness of the rotor surface, the non-uniform magnetic material and the like
In this embodiment, the voltage signal with pulse is acquired by a phase detection sensor that is a predetermined distance away from the rotor.
And step S20, detecting a shaft vibration voltage signal changing with the surface clearance of the rotor through a shaft vibration sensor measuring the shaft vibration, wherein the shaft vibration sensor is arranged at a second distance away from the rotor.
It can be understood that, when the rotor is in a turning state or rotates at a low rotation speed, the rotor is provided with a shaft vibration sensor, a shaft vibration signal is obtained through the shaft vibration sensor, the shaft vibration signal is a periodic signal of information such as rotor curvature, rotor surface smoothness, magnetic material unevenness and the like, a sine wave signal which represents that the rotor is curved and is the same as the rotor rotation period is obtained, and other interference signals may be superposed on the actual voltage signal of the shaft vibration sensor.
Step S30, obtaining a rotor rotation period T through a pulse voltage signal obtained by a phase discrimination sensor, and carrying out Fourier change on the shaft vibration voltage signal on the rotor rotation period T to obtain a sine wave signal which is synchronous with the rotor rotation period T and has the same period;
and obtaining the rotation period of the rotor by the voltage signal with the pulse measured by the phase discrimination sensor, and carrying out Fourier transform on the shaft vibration signal measured by the shaft vibration sensor on the rotation period of the rotor to obtain a sine wave signal with the same rotation period as the rotor, and obtaining the time information that the positive peak of the sine wave lags behind the pulse signal.
And step S40, defining the angle of one rotation to obtain the time information of the positive peak lag phase discrimination signal of the sine wave component with the same rotation frequency as the rotor in the sine wave signal.
It should be noted that the angle of one rotation of the rotor is 360 degrees, that is, 2 pi, the phase demodulation sensor and the shaft vibration sensor measure the same rotor, the period measured by the phase demodulation sensor is the rotor rotation period, and the periodic voltage signal measured by the shaft vibration sensor is subjected to fourier transform on the rotor rotation period, so as to obtain a sine wave related to the rotor curvature. In the case of the turning state or the low-speed rotation of the rotor, it is theoretically assumed that the sine wave represents the rotor curvature, and the time information in which the positive peak of the sine wave lags behind the pulse signal can be obtained from the sine wave and the voltage signal having the pulse.
And step S50, determining the bending angle information of the rotor according to the time information, and identifying the bending direction of the rotor through the bending angle information.
In the embodiment, the characteristic rotor bending angle is obtained through calculation of shaft vibration and phase discrimination signals in a TSI system equipped in the large-scale steam turbine generator unit. According to the index, the bending degree and the bending direction of the rotor can be accurately judged by combining the eccentricity value.
In the concrete implementation, the existing phase discrimination and eccentricity (shaft vibration) signals of a large-scale steam turbine generator unit are utilized, the phase discrimination pulse signals are utilized to obtain the rotation period T of the rotor, the Fourier transformation is carried out on the eccentricity (shaft vibration) signals in the period to obtain the standard sine wave, the time of the phase discrimination signal pulse signals advancing the positive peak value of the eccentricity standard sine wave signals is defined as T, the angle of one rotation is 360 degrees, and therefore the bending angle of the rotor is T/T multiplied by 360 degrees. Specifically to actual rotor, pulse signal sends for the phase discrimination groove of phase discrimination sensor measuring face, can know the biggest crooked direction of rotor through the position in phase discrimination groove, wherein, according to rotor rotation cycle and time information confirms the bending angle information of rotor includes: and dividing the time information by the time of the whole sampling period, multiplying the time information by the angle of one rotation to obtain the angle representing the bending direction of the rotor, and identifying the bending direction of the rotor by the angle representing the bending direction of the rotor.
According to the scheme, when the rotor rotates in a turning state or at a low rotating speed, the phase discrimination sensor is used for measuring the rotor with the phase discrimination groove, when the phase discrimination groove passes through the sensor, a pulse signal can be generated, the phase discrimination sensor outputs a voltage signal with a pulse, the triggering period of the pulse is the same as the rotating period of the rotor, and the phase discrimination sensor is arranged at a position away from the rotor by a first distance; detecting the surface of the rotor through a shaft vibration sensor, wherein the output voltage value of the shaft vibration sensor changes along with the change of a gap between the shaft vibration sensor and the surface of the rotor in the rotation process of the rotor, the output voltage signal of the shaft vibration sensor comprises shaft vibration signals of information such as the bending value of the rotor, the smoothness of the surface of the rotor, the unevenness of a magnetic material and the like, and the shaft vibration sensor is arranged at a second distance from the rotor; performing Fourier transform on the shaft vibration signal according to a rotor rotation period represented by the voltage signal with the pulse to obtain a sine wave signal which represents the bending of the rotor and is the same as the rotor rotation period, and obtaining pulse signal time information of the sine wave signal with the positive peak lagging behind the voltage signal with the pulse; and calculating according to the time information and the rotation period to determine the bending angle information of the rotor, and identifying the bending direction of the rotor according to the bending angle information.
Further, as shown in fig. 4, a second embodiment of the method for identifying a bending direction of a rotor according to the present invention is proposed based on the first embodiment, in this embodiment, a phase-identifying groove is provided on the rotor; the step S10 includes:
and S101, when the rotor is in a turning state or rotates at a low rotating speed, detecting the change of the distance between the rotor and the surface of the rotor through the phase discrimination sensor, and when the rotor rotates to the position of a phase discrimination groove, obtaining the pulse signal with the same rotation period as the rotor.
Namely, when the rotor is in a turning state or rotates at a low rotating speed, the phase discrimination sensor measures the change of the gap between the rotor and the rotor, and when the phase discrimination groove passes through the phase discrimination sensor, the output voltage of the phase discrimination sensor can be greatly changed due to the large change of the gap, so that a pulse signal is obtained.
It should be noted that, the phase discrimination groove on the rotor rotates along with the rotor, when the phase discrimination groove passes through the phase discrimination sensor, the gap between the sensor and the rotor changes, so the voltage measured by the phase discrimination sensor changes, the voltage signal output by the phase discrimination sensor generates a pulse, i.e., the voltage drops (rises), the rotor generates a pulse signal every time it rotates a circle, and the interval between two pulse signals is a rotation period T.
And step S102, generating the pulse voltage signal by the pulse signal with the same rotation period as the rotor and the relatively stable voltage signal output by the phase discrimination sensor.
It can be understood that the phase detection sensor finally outputs a voltage signal with pulses, and the period of the pulses is the same as the rotation period of the rotor.
As shown in fig. 5, the distance between the phase-detecting sensor and the rotor is a preset distance, the rotor is provided with a phase-detecting slot, and the phase-detecting slot rotates along a preset direction to obtain a corresponding relationship between time and a voltage signal, i.e., the voltage signal detected by the phase-detecting sensor, wherein the X axis represents time T, the Y axis represents voltage V, and the rotation period is T.
Further, the step S20 includes:
detecting the change of the clearance between the rotor surface and the shaft vibration sensor for measuring the shaft vibration to obtain a voltage signal related to the rotor bending value, and taking the voltage signal related to the rotor bending value as a shaft vibration voltage signal
In the process of rotor rotation, the change of the gap between the rotor surface and the axial vibration sensor is detected by the axial vibration sensor to obtain an axial vibration signal containing rotor bending information, as shown in a schematic axial vibration measurement signal principle diagram in figure 6, wherein, X axis is represented by time T, Y axis is represented by voltage V, rotation period is T, H represents high point, L represents low point, the distance between the shaft vibration sensor for measuring the eccentricity of the rotor and the surface of the rotor can be changed periodically, if the rotor has bending, the bending signal is represented by a standard sine wave, the actual eddy current sensor detects a waveform which is superposed with various interference signals (poor rotor surface smoothness, uneven rotor surface material magnetism and the like), the waveform may be an approximate sine wave as shown in fig. 6, or may be mainly represented as a periodic signal of the interference signal, which is measured as x (t).
According to the scheme provided by the embodiment, the phase discrimination sensor and the eddy current sensor which are arranged at the preset distance away from the rotor monitor the voltage signal and the shaft vibration signal, so that the bent rotor is analyzed more finely, and the bending direction information can be obtained except the bending degree information.
Further, as shown in fig. 7, a third embodiment of the method for identifying a bending direction of a rotor according to the present invention is proposed based on the first embodiment or the second embodiment, and in this embodiment, the step S30 includes:
in step S301, a rotor curvature value and phase angle information are acquired.
Step S302, carrying out Fourier change on the shaft vibration signal on the rotor rotation period T according to the rotor rotation period, the rotor bending value and the phase angle information to obtain a sine wave signal which is synchronous with the rotor rotation period T and has the same period.
Because the phase detection sensor and the shaft vibration sensor measure the same rotor, the period obtained by the phase detection sensor is the period of the shaft vibration sensor signal X (T), the period of the signal X (T) is Fourier transform with the period of T, and a sine wave signal containing the rotor bending value and the phase angle can be obtained, for example, a standard sine wave signal schematic diagram obtained by Fourier transform according to the phase detection periodic signal is shown in FIG. 8, wherein the X axis represents time T, the Y axis represents voltage V, the amplitude of the sine wave is 2A, and the period is T.
Fig. 9 is a schematic diagram comparing a phase detection signal with a standard sine wave, where the X-axis is represented by time t, the Y-axis is represented by voltage V, the amplitude of the sine wave is 2A, and the distance between the peak and the valley and the X-axis is X0The rotation period is T, and Δ T is the time information of the pulse signal with the same period lagging behind the positive peak of the sine wave signal with the same period.
Further, the step S302 includes:
acquiring periodic information; and carrying out Fourier transform on the shaft vibration signal according to the period information to obtain a sinusoidal signal with the same period as the rotation period of the rotor.
In a specific implementation, the shaft vibration signal is subjected to fourier transform on the rotor rotation period T according to the rotor rotation period, the rotor bending value and the phase angle information by using the following formula, so as to obtain a sine wave signal which is synchronous with the rotor rotation period T and has a consistent period:
wherein t represents time, x (t) represents the shaft vibration signal, and x0Is a constant, n is an integer, 2 pi is a constant, AnRepresenting a single peak of each sine wave signal, T representing the rotor rotation period measured from the phase-discriminated signal, phinThe phase angle information of each sine wave signal is expressed, when n is 1, the sine signal with the same rotation period of the rotor is obtained, and when n is 1, the sine signal component is
A1Is the rotor deflection value, phi1To bend the phase angle of the value, the time trigger point of the phase-detected signal is positioned at 0, phi1I.e. the rotor bend angle.
Further, the step S40 includes:
and defining an angle of one rotation, and comparing the pulse triggering time of the pulse voltage signal with a positive peak of a sine wave signal which is obtained after Fourier change and has the same rotation period as the rotor to obtain time information of a positive peak lagging phase discrimination signal of a sine wave component which has the same rotation frequency as the rotor in the sine wave signal.
Further, the step S50 includes:
determining bending angle information of the rotor according to the rotation period of the rotor and the time information;
identifying the bending direction of the rotor according to the bending angle information, the circumferential arrangement relation of the phase discrimination sensor and the shaft vibration sensor and the position of the phase discrimination groove for measuring a phase discrimination signal on the rotor;
correspondingly, the determining the bending angle information of the rotor according to the rotation period of the rotor and the time information includes:
and dividing the time information by the time of the whole sampling period, multiplying the time information by the angle of one rotation to obtain the angle representing the bending direction of the rotor, and identifying the bending direction of the rotor by the angle representing the bending direction of the rotor.
In a specific implementation, the time that the phase discrimination signal leads the positive peak of the sine wave is Δ T, and since the angle of one rotation of the rotor is 2 pi-360 °, the angle that the phase discrimination signal leads the positive peak of the sine wave is α - Δ T2 pi/T or α - Δ T/T × 360 °, which is an index representing the bending direction of the rotor, as shown in fig. 9, the sine wave signal of the same period obtained through fourier transform and the phase discrimination signal of the same period are obtained, so that the identification of the bending direction of the rotor is realized, and the accuracy of monitoring the bending of the rotor is improved.
According to the scheme provided by the embodiment, the shaft vibration signal is subjected to Fourier transform according to the period information to obtain a positive sine wave signal, so that the time of a sine wave positive peak lagging pulse signal is obtained, a phase angle is obtained according to the relation between the time and the rotation period, and finally the bending direction of the rotor is obtained through a key groove on the rotor.
The invention further provides a device for identifying the bending direction of the rotor.
Referring to fig. 10, fig. 10 is a functional block diagram of a first embodiment of a device for identifying a bending direction of a rotor according to the present invention.
In a first embodiment of the device for identifying a bending direction of a rotor according to the present invention, the device for identifying a bending direction of a rotor includes:
When rotor barring state or low-speed rotation, the measurement has the rotor of phase discrimination groove, can produce a pulse signal when the phase discrimination groove passes through the sensor, and phase discrimination sensor output one has the voltage signal of pulse, and the trigger cycle of pulse is the same with rotor rotation cycle, phase discrimination sensor locate with the rotor is apart from first distance department.
It should be noted that, the executing main body of the embodiment is identification equipment for the bending direction of the rotor, and may also be other equipment capable of achieving the same or similar functions.
As shown in fig. 3, the schematic diagram of a steam turbine rotor and its TSI testing system is that the steam turbine generator rotor is composed of a high-pressure section, a medium-pressure section, a low-pressure section, a generator section, and an exciter section, each section of the steam turbine rotor is supported by 2 bearings, the generator section rotor and the exciter section rotor are supported by 3 bearings, and there are 9 bearings. A phase discrimination sensor and an off-center shaft vibration sensor are arranged in the front of the rotor, the phase discrimination sensor and the shaft vibration sensor can detect the front curvature of the rotor and the increased bending direction of the rotor, wherein X and Y respectively represent two orthogonal shaft vibration sensors for measuring the vibration of the rotor at each bearing, A represents the phase discrimination sensor, and B represents the shaft vibration sensor.
The phase discrimination sensor is used for measuring a rotor with a phase discrimination groove, when the phase discrimination groove passes through the sensor, a pulse signal can be generated, the phase discrimination sensor outputs a voltage signal with a pulse, the triggering period of the pulse is the same as the rotation period of the rotor, and the phase discrimination sensor is arranged at a first distance from the rotor; the rotor surface is detected by the shaft vibration sensor, the output voltage value of the shaft vibration sensor changes along with the change of the gap between the shaft vibration sensor and the rotor surface in the rotation process of the rotor, and the output voltage signal of the shaft vibration sensor comprises the shaft vibration signal of information such as the bending value of the rotor, the poor smoothness of the rotor surface, the non-uniform magnetic material and the like
In this embodiment, the voltage signal with pulse is acquired by a phase detection sensor that is a predetermined distance away from the rotor.
The detection module 10 is further configured to detect a shaft vibration voltage signal varying with a surface gap of the rotor through a shaft vibration sensor for measuring shaft vibration, where the shaft vibration sensor is located at a second distance from the rotor.
It can be understood that, when the rotor is in a turning state or rotates at a low rotation speed, the rotor is provided with a shaft vibration sensor, a shaft vibration signal is obtained through the shaft vibration sensor, the shaft vibration signal is a periodic signal of information such as rotor curvature, rotor surface smoothness, magnetic material unevenness and the like, a sine wave signal which represents that the rotor is curved and is the same as the rotor rotation period is obtained, and other interference signals may be superposed on the actual voltage signal of the shaft vibration sensor.
The conversion module 20 is configured to obtain a rotor rotation period T through a pulse voltage signal obtained by a phase discrimination sensor, perform fourier transform on the shaft vibration voltage signal in the rotor rotation period T, and obtain a sine wave signal which is synchronous with the rotor rotation period T and has a same period;
and obtaining the rotation period of the rotor by the voltage signal with the pulse measured by the phase discrimination sensor, and carrying out Fourier transform on the shaft vibration signal measured by the shaft vibration sensor on the rotation period of the rotor to obtain a sine wave signal with the same rotation period as the rotor, and obtaining the time information that the positive peak of the sine wave lags behind the pulse signal.
The obtaining module 30 is configured to define an angle of one rotation, and obtain time information of a positive peak lag phase demodulation signal of a sinusoidal wave component in the sinusoidal wave signal, where the positive peak lag phase demodulation signal has the same rotation frequency as the rotor.
It should be noted that the angle of one rotation of the rotor is 360 degrees, that is, 2 pi, the phase demodulation sensor and the shaft vibration sensor measure the same rotor, the period measured by the phase demodulation sensor is the rotor rotation period, and the periodic voltage signal measured by the shaft vibration sensor is subjected to fourier transform on the rotor rotation period, so as to obtain a sine wave related to the rotor curvature. In the case of the turning state or the low-speed rotation of the rotor, it is theoretically assumed that the sine wave represents the rotor curvature, and the time information in which the positive peak of the sine wave lags behind the pulse signal can be obtained from the sine wave and the voltage signal having the pulse.
And the identification module 40 is configured to determine bending angle information of the rotor according to the time information, and identify a bending direction of the rotor according to the bending angle information.
In the embodiment, the characteristic rotor bending angle is obtained through calculation of shaft vibration and phase discrimination signals in a TSI system equipped in the large-scale steam turbine generator unit. According to the index, the bending degree and the bending direction of the rotor can be accurately judged by combining the eccentricity value.
In the concrete implementation, the existing phase discrimination and eccentricity (shaft vibration) signals of a large-scale steam turbine generator unit are utilized, the phase discrimination pulse signals are utilized to obtain the rotation period T of the rotor, the Fourier transformation is carried out on the eccentricity (shaft vibration) signals in the period to obtain the standard sine wave, the time of the phase discrimination signal pulse signals advancing the positive peak value of the eccentricity standard sine wave signals is defined as T, the angle of one rotation is 360 degrees, and therefore the bending angle of the rotor is T/T multiplied by 360 degrees. Specifically to actual rotor, pulse signal sends for the phase discrimination groove of phase discrimination sensor measuring face, can know the biggest crooked direction of rotor through the position in phase discrimination groove, wherein, according to rotor rotation cycle and time information confirms the bending angle information of rotor includes: and dividing the time information by the time of the whole sampling period, multiplying the time information by the angle of one rotation to obtain the angle representing the bending direction of the rotor, and identifying the bending direction of the rotor by the angle representing the bending direction of the rotor.
According to the scheme, when the rotor rotates in a turning state or at a low rotating speed, the phase discrimination sensor is used for measuring the rotor with the phase discrimination groove, when the phase discrimination groove passes through the sensor, a pulse signal can be generated, the phase discrimination sensor outputs a voltage signal with a pulse, the triggering period of the pulse is the same as the rotating period of the rotor, and the phase discrimination sensor is arranged at a position away from the rotor by a first distance; detecting the surface of the rotor through a shaft vibration sensor, wherein the output voltage value of the shaft vibration sensor changes along with the change of a gap between the shaft vibration sensor and the surface of the rotor in the rotation process of the rotor, the output voltage signal of the shaft vibration sensor comprises shaft vibration signals of information such as the bending value of the rotor, the smoothness of the surface of the rotor, the unevenness of a magnetic material and the like, and the shaft vibration sensor is arranged at a second distance from the rotor; performing Fourier transform on the shaft vibration signal according to a rotor rotation period represented by the voltage signal with the pulse to obtain a sine wave signal which represents the bending of the rotor and is the same as the rotor rotation period, and obtaining pulse signal time information of the sine wave signal with the positive peak lagging behind the voltage signal with the pulse; and calculating according to the time information and the rotation period to determine the bending angle information of the rotor, and identifying the bending direction of the rotor according to the bending angle information.
The device for identifying the bending direction of the rotor adopts all technical schemes of all the embodiments, so that the device at least has all the beneficial effects brought by the technical schemes of the embodiments, and further description is omitted.
Furthermore, an embodiment of the present invention further provides a storage medium, on which a program for identifying a bending direction of a rotor is stored, and the program for identifying a bending direction of a rotor is executed by a processor to perform the steps of the method for identifying a bending direction of a rotor as described above.
The storage medium described in the present invention adopts all technical solutions of all the above embodiments, so that at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a computer-readable storage medium (such as ROM/RAM, magnetic disk, optical disk) as described above, and includes several instructions for enabling an intelligent terminal (which may be a mobile phone, a computer, a terminal, an air conditioner, or a network terminal) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for identifying a bending direction of a rotor is characterized by comprising the following steps:
when the rotor is in a turning state or rotates at a low rotating speed, a pulse voltage signal synchronous with a rotating period is detected through a phase discrimination sensor, the pulse voltage signal is triggered once per rotation, and the phase discrimination sensor is arranged at a first distance from the rotor;
detecting a shaft vibration voltage signal changing with the surface clearance of the rotor by a shaft vibration sensor measuring shaft vibration, wherein the shaft vibration sensor is arranged at a second distance away from the rotor, and the shaft vibration voltage signal comprises a rotor bending value, a rotor surface smoothness difference and a periodic signal of non-uniform magnetic materials;
obtaining a rotor rotation period T through a pulse voltage signal obtained by a phase discrimination sensor, and carrying out Fourier change on the shaft vibration voltage signal on the rotor rotation period T to obtain a sine wave signal which is synchronous with the rotor rotation period T and has the same period;
defining the angle of one rotation to obtain the time information of a positive peak lag phase discrimination signal of a sine wave component with the same rotation frequency as the rotor in the sine wave signal;
and determining the bending angle information of the rotor according to the time information, and identifying the bending direction of the rotor according to the bending angle information.
2. The method for identifying a bending direction of a rotor according to claim 1, wherein the rotor is provided with a phase identifying groove;
when the rotor is in the barring state or low rotational speed rotates, detect the pulse voltage signal synchronous with the rotation cycle through phase discrimination sensor, include:
when the rotor is in a turning state or rotates at a low rotating speed, the phase discrimination sensor detects the change of the distance between the rotor and the surface of the rotor, and when the rotor rotates to the position of a phase discrimination groove, the pulse signal with the same rotation period as the rotor is obtained;
and generating the pulse voltage signal by using the pulse signal with the same rotation period as the rotor and the relatively stable voltage signal output by the phase discrimination sensor.
3. The method for identifying a bending direction of a rotor according to claim 1, wherein the detecting a shaft vibration voltage signal varying with a gap of a surface of the rotor by a shaft vibration sensor measuring shaft vibration includes:
and detecting the change of the clearance between the rotor surface and the shaft vibration sensor for measuring the shaft vibration to obtain a voltage signal related to the rotor bending value, and taking the voltage signal related to the rotor bending value as a shaft vibration voltage signal.
4. A method for identifying a bending direction of a rotor according to any one of claims 1 to 3, wherein the step of obtaining a rotor rotation period T from the pulse voltage signal obtained by the phase detection sensor, and performing fourier transform on the shaft vibration voltage signal over the rotor rotation period T to obtain a sine wave signal synchronized with the rotor rotation period T and having a period identical to the rotor rotation period T comprises:
acquiring a rotor bending value and phase angle information;
and carrying out Fourier change on the shaft vibration signal on the rotor rotation period T according to the rotor rotation period, the rotor bending value and the phase angle information to obtain a sine wave signal which is synchronous with the rotor rotation period T and has the same period.
5. The method for identifying the rotor bending direction according to claim 4, wherein the shaft vibration signal is Fourier-transformed on the rotor rotation period T according to the rotor rotation period, the rotor bending value and the phase angle information by using the following formula, so as to obtain a sine wave signal which is synchronous with the rotor rotation period T and has a consistent period:
wherein t represents time, x (t) represents the shaft vibration signal, and x0Is a constant, n is an integer, 2 pi is a constant, AnRepresenting a single peak of each sine wave signal, T representing the rotor rotation period measured from the phase-discriminated signal, phinPhase angle information of each sine wave signal is represented.
6. A method for identifying a bending direction of a rotor according to any one of claims 1 to 3, wherein the defining an angle of one rotation to obtain time information of a positive peak lag phase-discriminated signal of a sine-wave component of the sine-wave signal having the same frequency as a rotation frequency of the rotor comprises:
and defining an angle of one rotation, and comparing the pulse triggering time of the pulse voltage signal with a positive peak of a sine wave signal which is obtained after Fourier change and has the same rotation period as the rotor to obtain time information of a positive peak lagging phase discrimination signal of a sine wave component which has the same rotation frequency as the rotor in the sine wave signal.
7. The method for identifying a bending direction of a rotor according to any one of claims 1 to 3, wherein the determining bending angle information of the rotor based on the time information, the identifying the bending direction of the rotor by the bending angle information, comprises:
determining bending angle information of the rotor according to the rotation period of the rotor and the time information;
identifying the bending direction of the rotor according to the bending angle information, the circumferential arrangement relation of the phase discrimination sensor and the shaft vibration sensor and the position of the phase discrimination groove for measuring a phase discrimination signal on the rotor;
correspondingly, the determining the bending angle information of the rotor according to the rotation period of the rotor and the time information includes:
and dividing the time information by the time of the whole sampling period, multiplying the time information by the angle of one rotation to obtain the angle representing the bending direction of the rotor, and identifying the bending direction of the rotor by the angle representing the bending direction of the rotor.
8. An apparatus for identifying a bending direction of a rotor, comprising:
the detection module is used for detecting a pulse voltage signal synchronous with a rotation period through a phase discrimination sensor when the rotor is in a turning state or rotates at a low rotation speed, the pulse voltage signal is triggered once per rotation of one circle, and the phase discrimination sensor is arranged at a first distance from the rotor;
the detection module is further used for detecting a shaft vibration voltage signal changing with the surface clearance of the rotor through a shaft vibration sensor measuring shaft vibration, the shaft vibration sensor is arranged at a second distance away from the rotor, and the shaft vibration voltage signal comprises a rotor bending value, rotor surface smoothness difference and periodic signals of magnetic material unevenness;
the conversion module is used for obtaining a rotor rotation period T through a pulse voltage signal obtained by the phase discrimination sensor, and carrying out Fourier change on the shaft vibration voltage signal on the rotor rotation period T to obtain a sine wave signal which is synchronous with the rotor rotation period T and has the same period;
the acquisition module is used for defining the angle of one rotation to obtain the time information of a positive peak lag phase demodulation signal of a sine wave component with the same rotation frequency as the rotor in the sine wave signal;
and the identification module is used for determining the bending angle information of the rotor according to the time information and identifying the bending direction of the rotor according to the bending angle information.
9. An apparatus for identifying a bending direction of a rotor, comprising: a memory, a processor and a program for identifying a rotor bending direction stored on the memory and executable on the processor, the program for identifying a rotor bending direction being configured to implement the steps of the method for identifying a rotor bending direction according to any one of claims 1 to 7.
10. A storage medium, characterized in that the storage medium has stored thereon a program for identifying a bending direction of a rotor, which when executed by a processor implements the steps of the method for identifying a bending direction of a rotor according to any one of claims 1 to 7.
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