CN113701977B - Method and system for measuring maximum value of relative vibration of rotor in all directions - Google Patents

Method and system for measuring maximum value of relative vibration of rotor in all directions Download PDF

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Publication number
CN113701977B
CN113701977B CN202111007940.XA CN202111007940A CN113701977B CN 113701977 B CN113701977 B CN 113701977B CN 202111007940 A CN202111007940 A CN 202111007940A CN 113701977 B CN113701977 B CN 113701977B
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rotor
eddy current
value
acquisition point
position coordinates
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CN113701977A (en
Inventor
张华东
于信波
孙明
杨春
张富春
赵峰
张敬
李朋
邵帅
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Beijing Bicotest Tech Co ltd
Huaneng Shandong Power Generation Co Ltd
Huaneng Weihai Power Generation Co Ltd
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Beijing Bicotest Tech Co ltd
Huaneng Shandong Power Generation Co Ltd
Huaneng Weihai Power Generation Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/02—Vibration-testing by means of a shake table
    • G01M7/06—Multidirectional test stands
    • G—PHYSICS
    • 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
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/02—Vibration-testing by means of a shake table
    • G01M7/025—Measuring arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Abstract

The invention provides a method and a system for measuring the maximum value of relative vibration of a rotor in each direction, which belong to the field of thermal power generation, and the measuring method comprises the following steps: acquiring gap voltage values acquired by each eddy current sensor at a plurality of acquisition points in one rotation of the rotor; determining the position coordinates of each eddy current sensor according to the gap voltage value of each eddy current sensor for each acquisition point; determining the position coordinates of the rotor at the acquisition point according to the position coordinates of each eddy current sensor; determining the relative vibration value and the angle of the rotor at the acquisition point according to the position coordinates of the rotor at the acquisition point; and finally, according to the relative vibration values of the rotor at each acquisition point, the relative vibration maximum value and the corresponding angle of the rotor in each direction can be obtained, so that the accuracy of monitoring the operation of the rotor is improved.

Description

Method and system for measuring maximum value of relative vibration of rotor in all directions
Technical Field
The invention relates to the field of thermal power generation, in particular to a method and a system for measuring the maximum value of relative vibration of a rotor in all directions.
Background
In the field of thermal power generation, a steam turbine is a very important device, and monitoring of the steam turbine is also particularly important, and for a steam turbine generator, radial vibration of a rotor is a most basic index for measuring mechanical conditions of the steam turbine generator. For many mechanical failures, including rotor imbalance, misalignment, bearing wear, rub-impact, etc., can be detected by measuring radial vibrations. The rotor is the core component of the rotary machine, and whether the rotary machine can work normally is mainly determined by whether the rotor can work normally or not. Vibration faults are found in the movement of the rotor more directly and effectively than extracting information from vibrations of the bearing housing or casing. Therefore, it is becoming more and more important to measure radial vibration of a rotor, which is very useful for machine fault diagnosis.
In the prior art, for monitoring radial vibration of a turbine rotor, 2 eddy current sensors are installed perpendicularly to each other to measure, and the installation angle is generally 45 degrees and 135 degrees, and the measurement principle of the sensors is to measure the surface of the perpendicular sensor, so that the display value is only the value of the installation angle, namely only the vibration values in the 45 degrees and 135 degrees can be displayed, and therefore, the existing measurement method is not accurate for monitoring the movement of the rotor and cannot accurately reflect the working condition of the rotor.
Based on the above, a new measurement method is needed to improve the accuracy of rotor operation monitoring.
Disclosure of Invention
The invention aims to provide a method and a system for measuring the maximum value of relative vibration of a rotor in all directions, which can improve the accuracy of monitoring the operation of the rotor.
In order to achieve the above object, the present invention provides the following solutions:
a method of measuring a maximum value of relative vibration of a rotor in each direction, the method of measuring a maximum value of relative vibration of a rotor in each direction comprising:
acquiring gap voltage values acquired by each eddy current sensor at a plurality of acquisition points in one rotation of the rotor; each acquisition point is the position of different angles when the rotor rotates;
determining the position coordinates of each eddy current sensor according to the gap voltage value of each eddy current sensor for each acquisition point;
determining the position coordinates of the rotor at the acquisition point according to the position coordinates of each eddy current sensor;
determining the relative vibration value and the angle of the rotor at the acquisition point according to the position coordinates of the rotor at the acquisition point;
and determining the maximum value and the corresponding angle of the relative vibration value according to the relative vibration value of the rotor at each acquisition point.
Optionally, the number of the eddy current sensors is 2;
the position coordinates of each eddy current sensor are obtained according to the following formula:
a＝1，2；
wherein a represents the serial number of the eddy current sensor, (X) a ，Y a ) For the position coordinate value of the a-th eddy current sensor, L is the left backlash value of the rotor, R is the right backlash value of the rotor, U is the top backlash value of the rotor, D is the shaft diameter of the rotor, and V a Gap voltage value W of a-th eddy current sensor a Is the installation angle of the a-th eddy current sensor.
Optionally, the number of the eddy current sensors is 2;
the determining the position coordinates of the rotor at the acquisition point according to the position coordinates of each eddy current sensor specifically comprises:
determining initial position coordinates of the rotor at an mth acquisition point according to the following formula;
wherein, (x) m ，y m ) For the initial position coordinates of the rotor at the mth acquisition point, (X) 1 ,Y 1 ) For the position coordinates of the first eddy current sensor, (X) 2 ,Y 2 ) Position coordinates of the second eddy current sensor;
comparing the abscissa x in the initial position coordinates m The magnitude of the top clearance value of the installation of the rotor is smaller than the abscissa x of the top clearance value of the installation of the rotor m The corresponding initial position coordinates are the position coordinates of the rotor at the mth acquisition point.
Alternatively, two eddy current sensors are arranged vertically.
Alternatively, the two eddy current sensors are disposed at angles of 45 ° and 135 °.
Optionally, the relative vibration value of the rotor at the mth acquisition point is obtained according to the following formula:
wherein R is m For the relative vibration value of the rotor at the mth acquisition point, (x) m ，y m ) Is the position coordinates of the rotor at the mth acquisition point.
Optionally, the angle of the rotor at the mth acquisition point is obtained according to the following formula:
wherein θ m For the angle of the rotor at the mth acquisition point, (x) m ，y m ) Is the position coordinates of the rotor at the mth acquisition point.
In order to achieve the above purpose, the present invention also provides the following solutions:
a system for measuring a maximum value of relative vibration of a rotor in each direction, the system comprising:
the acquisition unit is used for acquiring gap voltage values acquired by each eddy current sensor at a plurality of acquisition points in one rotation of the rotor; each acquisition point is the position of different angles when the rotor rotates;
the sensor position determining unit is connected with the acquisition unit and is used for determining the position coordinates of each eddy current sensor according to the gap voltage value of each eddy current sensor for each acquisition point;
the rotor position determining unit is connected with the sensor position determining unit and is used for determining the position coordinates of the rotor at the acquisition point according to the position coordinates of each eddy current sensor;
the rotor vibration value and angle determining unit is connected with the rotor position determining unit and is used for determining the relative vibration value and angle of the rotor at the acquisition point according to the position coordinates of the rotor at the acquisition point;
and the maximum value determining unit is connected with the rotor vibration value and angle determining unit and is used for determining the maximum value of the relative vibration value and the corresponding angle according to the relative vibration value of the rotor at each acquisition point.
Optionally, the number of the eddy current sensors is 2;
the position coordinates of each eddy current sensor are obtained according to the following formula:
a＝1,2；
wherein a represents the serial number of the eddy current sensor, (X) a ，Y a ) Is a (a)The position coordinate values of the eddy current sensors are L, R, U, D, V, and V, wherein L is the left backlash value of the rotor, R is the right backlash value of the rotor, U is the top backlash value of the rotor, D is the shaft diameter of the rotor a Gap voltage value W of a-th eddy current sensor a Is the installation angle of the a-th eddy current sensor.
Optionally, the number of the eddy current sensors is 2;
the rotor position determination unit includes:
the initial position coordinate determining module is used for obtaining the initial position coordinate of the rotor at the mth acquisition point according to the following formula:
wherein, (x) m ，y m ) For the initial position coordinates of the rotor at the mth acquisition point, (X) 1 ,Y 1 ) For the position coordinates of the first eddy current sensor, (X) 2 ,Y 2 ) Position coordinates of the second eddy current sensor;
the comparison module is connected with the initial position coordinate determination module and is used for comparing the abscissa x in the initial position coordinates m The magnitude of the top clearance value of the installation of the rotor is smaller than the abscissa x of the top clearance value of the installation of the rotor m The corresponding initial position coordinates are the position coordinates of the rotor at the mth acquisition point.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: obtaining the position of the eddy current sensor by obtaining relevant installation parameters (such as a left side clearance value, a right side clearance value, a top clearance value, a rotor shaft diameter, a sensor installation angle and an installation clearance voltage) of the rotor; according to the position of the eddy current sensor, the position of the rotor at each acquisition point is obtained; according to the position of the rotor at each acquisition point, the relative vibration value and the angle of the rotor at each corresponding acquisition point are obtained, and finally the relative vibration maximum value and the corresponding angle of the rotor in each direction can be obtained, so that the accuracy of rotor operation monitoring is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of measuring the maximum value of relative vibration of a rotor in each direction according to the present invention;
FIG. 2 is a graph of the measurement of the maximum relative vibration of the rotor in each direction;
FIG. 3 is a block diagram of a system for measuring the maximum value of relative vibration of a rotor in each direction according to the present invention.
Symbol description:
an acquisition unit-1, a sensor position determination unit-2, a rotor position determination unit-3, a rotor vibration value and angle determination unit-4, a maximum value determination unit-5.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a method and a system for measuring the maximum value of relative vibration of a rotor in each direction, wherein the position of an eddy current sensor is obtained by acquiring relevant installation parameters (such as a left side clearance value, a right side clearance value, a top clearance value, a rotor shaft diameter, a sensor installation angle and an installation clearance voltage) of the rotor; according to the position of the eddy current sensor, the position of the rotor at each acquisition point is obtained; according to the position of the rotor at each acquisition point, the relative vibration value and the angle of the rotor at each corresponding acquisition point are obtained, and finally the relative vibration maximum value and the corresponding angle of the rotor in each direction can be obtained, so that the accuracy of rotor operation monitoring is improved.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the method for measuring the maximum value of the relative vibration of the rotor in each direction comprises the following steps:
s1: acquiring gap voltage values acquired by each eddy current sensor at a plurality of acquisition points in one rotation of the rotor; each acquisition point is the position of different angles when the rotor rotates.
S2: for each acquisition point, the position coordinates of each eddy current sensor are determined according to the gap voltage value of each eddy current sensor. Preferably, the number of the eddy current sensors is 2.
Specifically, the position coordinates of each eddy current sensor are obtained according to the following formula:
a＝1，2；
wherein a represents the serial number of the eddy current sensor, (X) a ，Y a ) For the position coordinate value of the a-th eddy current sensor, L is the left backlash value of the rotor, R is the right backlash value of the rotor, U is the top backlash value of the rotor, D is the shaft diameter of the rotor, and V a For the gap voltage value, W, of the a-th eddy current sensor a Is the installation angle of the a-th eddy current sensor.
In the present embodiment, the position of the eddy current sensor is a position coordinate with respect to the rotor shaft center.
S3: and determining the position coordinates of the rotor at the acquisition point according to the position coordinates of each eddy current sensor.
S4: and determining the relative vibration value and the angle of the rotor at the acquisition point according to the position coordinates of the rotor at the acquisition point.
Specifically, the relative vibration value of the rotor at the mth acquisition point is obtained according to the following formula:
wherein R is m For the relative vibration value of the rotor at the mth acquisition point, (x) m ，y m ) Is the position coordinates of the rotor at the mth acquisition point.
The angle of the rotor at the mth acquisition point is obtained according to the following formula:
wherein θ m For the angle of the rotor at the mth acquisition point, (x) m ，y m ) Is the position coordinates of the rotor at the mth acquisition point.
S5: and determining the maximum value and the corresponding angle of the relative vibration value according to the relative vibration value of the rotor at each acquisition point.
In this embodiment, two eddy current sensors are arranged vertically. And two eddy current sensors are installed in 45 deg. and 135 deg. directions of the rotor, respectively.
Further, S3: according to the position coordinates of each eddy current sensor, determining the position coordinates of the rotor at the acquisition point specifically comprises the following steps:
determining initial position coordinates of the rotor at an mth acquisition point according to the following formula;
wherein, (x) m ，y m ) For the initial position coordinates of the rotor at the mth acquisition point, (X) 1 ,Y 1 ) For the position coordinates of the first eddy current sensor at the mth acquisition point, (X) 2 ,Y 2 ) Position coordinates of the second eddy current sensor at an mth acquisition point;
comparing the abscissa x in the initial position coordinates m The magnitude of the top clearance value of the installation of the rotor is smaller than the abscissa x of the top clearance value of the installation of the rotor m The corresponding initial position coordinates are the position coordinates of the rotor at the mth acquisition point.
Since the calculation result of the equation set has 2 sets of values, but since the rotor position cannot exceed the head clearance value, only the calculation result x is reserved m 1 set of data less than the tip clearance value as the coordinates of the rotor.
The invention mainly utilizes the existing installed eddy current sensor, calculates the acquisition points in each acquisition period, and at the same time, the 2 sensors can obtain the gap voltage value at one acquisition point, and the position of the rotor at the moment can be calculated through the gap voltage values of the 2 acquisition points, so that the position of the rotor at any moment in the whole acquisition period can be calculated, and the maximum value and the position angle of the rotor vibration can be found through the comparison of the data in the whole acquisition period.
The invention can obtain the vibration values of the installation direction of the eddy current sensor, and can also calculate the vibration values of other position directions (such as 40 degrees, 115 degrees and 325 degrees), wherein the minimum angle of the position directions is related to the acquisition point.
If the acquisition point is M and the position direction angle is N, m×n=360, and the correspondence is as follows.
Before calculating the relative vibration values of all directions, the original data are required to be searched, wherein the original data comprise a top clearance value, a left side clearance value, a right side clearance value, a mounting clearance voltage of a sensor, a sensor mounting angle and a rotor shaft diameter, the rotor shaft diameter can be searched in a design specification, and other data can be searched in a maintenance record.
The relative vibration values and angles of the rotor in each direction at a certain time are calculated as follows
Taking the original (initial) position as a reference, taking the maximum value of the relative vibration value in the whole acquisition period as the maximum value of the rotor vibration, and taking the corresponding position (angle) as the position direction of the maximum rotor vibration. Fig. 2 is a graph showing the results of measuring the maximum value of the relative vibration of the rotor and the corresponding angle in a certain acquisition period by using the method for measuring the maximum value of the relative vibration of the rotor in each direction.
In the embodiment shown in fig. 2, X is a first eddy current sensor mounted in a 45 ° direction and Y is a second eddy current sensor mounted in a 135 ° direction. After the relative vibration values of the rotor in all directions are measured by adopting the measuring method, the maximum value of the relative vibration values of all the acquisition points is obtained, wherein the relative vibration value corresponding to 45 degrees is 48um, the relative vibration value corresponding to 135 degrees is 38um, and the relative vibration value corresponding to 67 degrees is 58 um.
According to the invention, the relative vibration values of a plurality of angles in one circle of rotor rotation are calculated, so that the maximum value of the relative vibration of the rotor can be obtained, and compared with the traditional method for only displaying the maximum vibration values of the sensor mounting angles of 45 degrees and 135 degrees, the accuracy of the relative vibration value of the rotor is improved. The rotor vibration detection device can help field personnel to more intuitively and rapidly find the maximum value and the position direction of the rotor in radial vibration, timely and effectively process corresponding faults, reduce unknown faults caused by large vibration of the rotor in other directions, provide guarantee for safe operation of a unit, improve working efficiency, and have important roles in daily inspection work and overhaul maintenance work of the field personnel.
As shown in fig. 3, the measuring system for the maximum value of the relative vibration of the rotor in each direction of the present invention comprises: an acquisition unit 1, a sensor position determination unit 2, a rotor position determination unit 3, a rotor vibration value and angle determination unit 4, and a maximum value determination unit 5.
The acquisition unit 1 is used for acquiring gap voltage values acquired by each eddy current sensor at a plurality of acquisition points in one rotation of the rotor. Each acquisition point is the position of different angles when the rotor rotates.
The sensor position determining unit 2 is connected with the acquiring unit 1, and the sensor position determining unit 2 is used for determining the position coordinates of each eddy current sensor according to the gap voltage value of each eddy current sensor for each acquisition point.
Specifically, the number of the eddy current sensors is 2;
the position coordinates of each eddy current sensor are obtained according to the following formula:
a＝1，2；
wherein a represents the serial number of the eddy current sensor, (X) a ，Y a ) For the position coordinate value of the a-th eddy current sensor, L is the left backlash value of the rotor, R is the right backlash value of the rotor, U is the top backlash value of the rotor, D is the shaft diameter of the rotor, and V a Gap voltage value W of a-th eddy current sensor a Is the installation angle of the a-th eddy current sensor.
The rotor position determining unit 3 is connected with the sensor position determining unit 2, and the rotor position determining unit 3 is used for determining the position coordinates of the rotor at the acquisition point according to the position coordinates of each eddy current sensor.
In this embodiment, the number of the eddy current sensors is 2;
specifically, the rotor position determination unit includes: and the initial position coordinate determining module and the comparison module.
The initial position coordinate determining module is used for obtaining the initial position coordinate of the rotor at the mth acquisition point according to the following formula:
wherein, (x) m ，y m ) For the initial position coordinates of the rotor at the mth acquisition point, (X) 1 ,Y 1 ) For the position coordinates of the first eddy current sensor at the mth acquisition point, (X) 2 ,Y 2 ) Is the position coordinate of the second eddy current sensor at the mth acquisition point.
The comparison module is connected with the initial position coordinate determination module and is used for comparing the abscissa x in the initial position coordinate m The magnitude of the top clearance value of the installation of the rotor is smaller than the abscissa x of the top clearance value of the installation of the rotor m The corresponding initial position coordinates are the position coordinates of the rotor at the mth acquisition point.
The rotor vibration value and angle determining unit 4 is connected with the rotor position determining unit 3, and the rotor vibration value and angle determining unit 4 is used for determining the relative vibration value and angle of the rotor at the acquisition point according to the position coordinates of the rotor at the acquisition point.
Specifically, the relative vibration value of the rotor at the mth acquisition point is obtained according to the following formula:
wherein R is m For the relative vibration value of the rotor at the mth acquisition point, (x) m ，y m ) Is the position coordinates of the rotor at the mth acquisition point.
The angle of the rotor at the mth acquisition point is obtained according to the following formula:
wherein θ m For the angle of the rotor at the mth acquisition point, (x) m ，y m ) Is the position coordinates of the rotor at the mth acquisition point.
The maximum value determining unit 5 is connected with the rotor vibration value and angle determining unit 4, and the maximum value determining unit 5 is used for determining the maximum value and the corresponding angle of the relative vibration value according to the relative vibration value of the rotor at each acquisition point.
Compared with the prior art, the measuring system for the maximum value of the relative vibration of the rotor in each direction has the same beneficial effects as the measuring method for the maximum value of the relative vibration of the rotor in each direction, and is not repeated herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.

Claims (6)

1. A method for measuring a maximum value of relative vibration of a rotor in each direction, the method comprising:
acquiring gap voltage values acquired by each eddy current sensor at a plurality of acquisition points in one rotation of the rotor; each acquisition point is the position of different angles when the rotor rotates; the number of the eddy current sensors is 2;
determining the position coordinates of each eddy current sensor according to the gap voltage value of each eddy current sensor for each acquisition point; the position coordinates of each eddy current sensor are obtained according to the following formula:
wherein a represents the serial number of the eddy current sensor, (X) a ，Y a ) For the position coordinate value of the a-th eddy current sensor, L is the left backlash value of the rotor, R is the right backlash value of the rotor, U is the top backlash value of the rotor, D is the shaft diameter of the rotor, and V a Gap voltage value W of a-th eddy current sensor a The installation angle of the a-th eddy current sensor;
according to the position coordinates of each eddy current sensor, determining the position coordinates of the rotor at the acquisition point specifically comprises the following steps:
determining initial position coordinates of the rotor at an mth acquisition point according to the following formula;
wherein, (x) m ，y m ) For the initial position coordinates of the rotor at the mth acquisition point, (X) 1 ,Y 1 ) For the position coordinates of the first eddy current sensor, (X) 2 ,Y 2 ) Position coordinates of the second eddy current sensor;
comparing the abscissa x in the initial position coordinates m The magnitude of the top clearance value of the installation of the rotor is smaller than the abscissa x of the top clearance value of the installation of the rotor m The corresponding initial position coordinates are the position coordinates of the rotor at the mth acquisition point;
determining the relative vibration value and the angle of the rotor at the acquisition point according to the position coordinates of the rotor at the acquisition point;
and determining the maximum value and the corresponding angle of the relative vibration value according to the relative vibration value of the rotor at each acquisition point.
2. The method of measuring the maximum value of relative vibration of a rotor in each direction according to claim 1, wherein two eddy current sensors are arranged vertically.
3. A method of measuring the maximum value of relative vibration of a rotor in each direction according to claim 2, wherein the two eddy current sensors are arranged at angles of 45 ° and 135 °.
4. The method for measuring the maximum value of the relative vibration of the rotor in each direction according to claim 1, wherein the relative vibration value of the rotor at the mth acquisition point is obtained according to the following formula:
wherein R is m For the relative vibration value of the rotor at the mth acquisition point, (x) m ，y m ) Is the position coordinates of the rotor at the mth acquisition point.
5. The method for measuring the maximum value of relative vibration of a rotor in each direction according to claim 1, wherein the angle of the rotor at the mth acquisition point is obtained according to the following formula:
wherein θ m For the angle of the rotor at the mth acquisition point, (x) m ，y m ) Is the position coordinates of the rotor at the mth acquisition point.
6. A system for measuring the maximum value of relative vibration of a rotor in each direction, the system comprising:
the acquisition unit is used for acquiring gap voltage values acquired by each eddy current sensor at a plurality of acquisition points in one rotation of the rotor; each acquisition point is the position of different angles when the rotor rotates; the number of the eddy current sensors is 2;
the sensor position determining unit is connected with the acquisition unit and is used for determining the position coordinates of each eddy current sensor according to the gap voltage value of each eddy current sensor for each acquisition point; the position coordinates of each eddy current sensor are obtained according to the following formula:
wherein a represents the serial number of the eddy current sensor, (X) a ，Y a ) For the position coordinate value of the a-th eddy current sensor, L is the left backlash value of the rotor, R is the right backlash value of the rotor, U is the top backlash value of the rotor, D is the shaft diameter of the rotor, and V a Gap voltage value W of a-th eddy current sensor a The installation angle of the a-th eddy current sensor;
the rotor position determining unit is connected with the sensor position determining unit and is used for determining the position coordinates of the rotor at the acquisition point according to the position coordinates of each eddy current sensor;
the rotor position determination unit includes:
the initial position coordinate determining module is used for obtaining the initial position coordinate of the rotor at the mth acquisition point according to the following formula:
wherein, (x) m ，y m ) For the initial position coordinates of the rotor at the mth acquisition point, (X) 1 ,Y 1 ) For the position coordinates of the first eddy current sensor, (X) 2 ,Y 2 ) Position coordinates of the second eddy current sensor;
the comparison module is connected with the initial position coordinate determination module and is used for comparing the abscissa x in the initial position coordinates m The magnitude of the top clearance value of the installation of the rotor is smaller than the abscissa x of the top clearance value of the installation of the rotor m The corresponding initial position coordinates are the position coordinates of the rotor at the mth acquisition point;
the rotor vibration value and angle determining unit is connected with the rotor position determining unit and is used for determining the relative vibration value and angle of the rotor at the acquisition point according to the position coordinates of the rotor at the acquisition point;
and the maximum value determining unit is connected with the rotor vibration value and angle determining unit and is used for determining the maximum value of the relative vibration value and the corresponding angle according to the relative vibration value of the rotor at each acquisition point.
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