CN-121994180-A - Correction method and system for rotor vibration displacement signal

CN121994180ACN 121994180 ACN121994180 ACN 121994180ACN-121994180-A

Abstract

This application proposes a method and system for correcting rotor vibration displacement signals, which relates to the field of displacement signal correction technology. The present application not only solves the problem of multi deviation coupling that existing technologies cannot handle, but also achieves the integrity, adaptability, and programmability of the correction strategy through a structured two-stage correction mechanism. Compared with traditional single parameter deduction or fixed proportion normalization methods, the present application significantly improves the geometric authenticity and diagnostic reliability of the axis trajectory, especially suitable for industrial field environments where sensor installation errors, thermal deformation, and gain mismatches coexist, providing a solid data foundation for high-precision state monitoring of rotating machinery.

Inventors

LI QIURONG
ZHOU LIFANG

Assignees

长沙大道精工科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260408

Claims (9)

1. A method for correcting a rotor vibration displacement signal, comprising the steps of: s1, synchronously acquiring a first original displacement signal and a second original displacement signal through a first displacement sensor and a second displacement sensor; S2, aligning the first original displacement signal and the second original displacement signal according to time to form a two-dimensional track point set containing a plurality of data points; s3, based on the two-dimensional track point set, three characteristic parameters are obtained through calculation, correction condition judgment is respectively carried out on the first original displacement signal and the second original displacement signal according to the three characteristic parameters, correction operation is carried out according to judgment results, and a first final corrected displacement signal and a second final corrected displacement signal are obtained.
2. The method of claim 1, wherein the three characteristic parameters include an X-direction static offset, a Y-direction static offset, and an equivalent displacement compensation.
3. The method according to claim 2, wherein the performing correction condition judgment on the first original displacement signal and the second original displacement signal according to the three characteristic parameters, and performing correction operation according to the judgment result, to obtain a first final corrected displacement signal and a second final corrected displacement signal, comprises: s31, calculating to obtain a composite characteristic parameter based on the X-direction static offset, the Y-direction static offset and the equivalent displacement compensation; S32, respectively calculating a first correlation coefficient between the X-direction static offset and the composite characteristic parameter, a second correlation coefficient between the Y-direction static offset and the composite characteristic parameter and a third correlation coefficient between the equivalent displacement compensation amount and the composite characteristic parameter; s33, setting a first threshold value for the X-direction static offset, a second threshold value for the Y-direction static offset, and a third threshold value for the equivalent displacement compensation; s34, judging the correction situation of the correction of the first original displacement signal and the second original displacement signal according to the three characteristic parameters, the threshold values of the three characteristic parameters and the correlation coefficient between the three characteristic parameters and the composite characteristic parameter, and implementing the correction operation according to the correction situation to obtain a first final corrected displacement signal and a second final corrected displacement signal.
4. A method for correcting a rotor vibration displacement signal according to claim 3, wherein the determining the correction of the first and second original displacement signals according to the three characteristic parameters, the threshold values of the three characteristic parameters, and the correlation coefficient between the three characteristic parameters and the composite characteristic parameter, and performing the correction according to the correction, to obtain the first and second final corrected displacement signals comprises: S341, judging a first correction situation set of the first original displacement signal and the second original displacement signal according to three characteristic parameters and threshold values of the three characteristic parameters, and implementing initial correction operation according to each situation in the first correction situation set to obtain a first initial corrected displacement signal and a second initial corrected displacement signal; S342, judging a second correction situation set of the first initial corrected displacement signal and the second initial corrected displacement signal according to the correlation coefficients between the three characteristic parameters and the composite characteristic parameters, and implementing a secondary correction operation on the initial correction result according to each situation in the second correction situation set to obtain a first final corrected displacement signal and a second final corrected displacement signal.
5. The method according to claim 4, wherein determining the first set of correction situations of the first original displacement signal and the second original displacement signal according to the three characteristic parameters and the threshold values of the three characteristic parameters comprises: S341A1, if the X-direction static offset is greater than a first threshold, the Y-direction static offset is greater than a second threshold, and the equivalent displacement compensation is greater than a third threshold, confirming that the first original displacement signal and the second original displacement signal need to be subjected to initial correction, and recording the current judgment result as a situation A1 and incorporating the current judgment result into a first correction situation set; S341A2, if the X-direction static offset is greater than the first threshold, the Y-direction static offset is greater than the second threshold, and the equivalent displacement compensation is less than or equal to the third threshold, confirming that the first original displacement signal and the second original displacement signal need to be subjected to initial correction, and recording the current judgment result as a situation A2 and incorporating the current judgment result into the first correction situation set; S341A3, if the X-direction static offset is greater than the first threshold, the Y-direction static offset is less than or equal to the second threshold, and the equivalent displacement compensation is greater than the third threshold, confirming that the first original displacement signal and the second original displacement signal need to be subjected to initial correction, and recording the current judgment result as a situation A3 and incorporating the current judgment result into the first correction situation set; S341A4, if the X-direction static offset is greater than the first threshold, the Y-direction static offset is less than or equal to the second threshold, and the equivalent displacement compensation is less than or equal to the third threshold, confirming that the first original displacement signal and the second original displacement signal need to be subjected to initial correction, and recording the current judgment result as a situation A4 and incorporating the current judgment result into the first correction situation set; S341A5, if the X-direction static offset is smaller than or equal to the first threshold, the Y-direction static offset is larger than the second threshold, and the equivalent displacement compensation is larger than the third threshold, confirming that the first original displacement signal and the second original displacement signal need to be subjected to initial correction, and recording the current judgment result as a situation A5 and incorporating the current judgment result into the first correction situation set; S341A6, if the X-direction static offset is smaller than or equal to the first threshold, the Y-direction static offset is larger than the second threshold, and the equivalent displacement compensation is smaller than or equal to the third threshold, confirming that the first original displacement signal and the second original displacement signal need to be subjected to initial correction, and recording the current judgment result as a situation A6 and incorporating the current judgment result into the first correction situation set; S341A7, if the X-direction static offset is smaller than or equal to the first threshold, the Y-direction static offset is smaller than or equal to the second threshold, and the equivalent displacement compensation is larger than the third threshold, confirming that the initial correction is required to be executed on the first original displacement signal and the second original displacement signal, and recording the current judgment result as a situation A7 and incorporating the current judgment result into the first correction situation set; S341A8, if the X-direction static offset is less than or equal to the first threshold, the Y-direction static offset is less than or equal to the second threshold, and the equivalent displacement compensation is less than or equal to the third threshold, confirming that the initial correction is not required to be performed on the first original displacement signal and the second original displacement signal, and recording the current judgment result as a situation A8 and incorporating the current judgment result into the first correction situation set.
6. The method according to claim 5, wherein determining the second set of correction situations of the first initially corrected displacement signal and the second initially corrected displacement signal according to the correlation coefficients between the three characteristic parameters and the composite characteristic parameter comprises: For each case in the first set of correction cases, performing the following determination: S342B1, if the first correlation coefficient is greater than a preset first correlation threshold, the second correlation number is greater than a preset second correlation threshold, and the third correlation number is greater than a preset third correlation threshold, confirming that the secondary correction needs to be performed on the initial correction result, and recording the current judgment result as a situation B1 and incorporating the current judgment result into a second correction situation set; S342B2, if the first correlation coefficient is greater than a preset first correlation threshold, the second correlation number is greater than a preset second correlation threshold, and the third correlation number is less than or equal to a preset third correlation threshold, confirming that the secondary correction needs to be performed on the initial correction result, and recording the current judgment result as a situation B2 and incorporating the current judgment result into a second correction situation set; S342B3, if the first correlation coefficient is greater than a preset first correlation threshold, the second correlation number is less than or equal to a preset second correlation threshold, and the third correlation number is greater than a preset third correlation threshold, confirming that the secondary correction needs to be performed on the initial correction result, and recording the current judgment result as a situation B3 and incorporating the current judgment result into a second correction situation set; S342B4, if the first correlation coefficient is greater than a preset first correlation threshold, the second correlation number is less than or equal to a preset second correlation threshold, and the third correlation number is less than or equal to a preset third correlation threshold, confirming that the secondary correction needs to be performed on the initial correction result, and recording the current judgment result as a situation B4 and incorporating the current judgment result into a second correction situation set; S342B5, if the first correlation coefficient is smaller than or equal to a preset first correlation threshold, the second correlation number is larger than a preset second correlation threshold, and the third correlation number is larger than a preset third correlation threshold, confirming that the secondary correction needs to be executed on the initial correction result, and recording the current judgment result as a situation B5 and incorporating the current judgment result into a second correction situation set; S342B6, if the first correlation coefficient is smaller than or equal to a preset first correlation threshold, the second correlation number is larger than a preset second correlation threshold, and the third correlation number is smaller than or equal to a preset third correlation threshold, confirming that the secondary correction needs to be executed on the initial correction result, and recording the current judgment result as a situation B6 and incorporating the current judgment result into a second correction situation set; S342B7, if the first correlation coefficient is smaller than or equal to a preset first correlation threshold, the second correlation number is smaller than or equal to a preset second correlation threshold, and the third correlation number is larger than a preset third correlation threshold, confirming that the secondary correction needs to be executed on the initial correction result, and recording the current judgment result as a situation B7 and incorporating the current judgment result into a second correction situation set; S342B8, if the first correlation coefficient is smaller than or equal to a preset first correlation threshold, the second correlation number is smaller than or equal to a preset second correlation threshold, and the third correlation number is smaller than or equal to a preset third correlation threshold, confirming that the initial correction result does not need to be subjected to secondary correction, and recording the current judgment result as a situation B8 and not including the second correction situation set.
7. The method of claim 5, wherein performing an initial calibration operation according to each of a first set of calibration conditions to obtain a first initial calibrated displacement signal and a second initial calibrated displacement signal, comprises: S341C1, under the condition A1, based on the X-direction static offset, the Y-direction static offset and the equivalent displacement compensation, performing initial correction operation on the first original displacement signal and the second original displacement signal in a cooperative manner to obtain a first initial corrected displacement signal and a second initial corrected displacement signal; S341C2, under the condition A2, based on the X-direction static offset and the Y-direction static offset, performing initial correction operation on the first original displacement signal and the second original displacement signal in a cooperative manner to obtain a first initial corrected displacement signal and a second initial corrected displacement signal; S341C3, under the condition A3, based on the X-direction static offset and the equivalent displacement compensation quantity, performing initial correction operation on the first original displacement signal and the second original displacement signal in a cooperative manner to obtain a first initial corrected displacement signal and a second initial corrected displacement signal; S341C4, under the condition A4, based on the X-direction static offset, performing initial correction operation on the first original displacement signal and the second original displacement signal in a cooperative manner to obtain a first initial corrected displacement signal and a second initial corrected displacement signal; S341C5, under the condition A5, based on the Y-direction static offset and the equivalent displacement compensation quantity, performing initial correction operation on the first original displacement signal and the second original displacement signal in a cooperative manner to obtain a first initial corrected displacement signal and a second initial corrected displacement signal; S341C6, under the condition A6, based on the Y-direction static offset, performing initial correction operation on the first original displacement signal and the second original displacement signal in a cooperative manner to obtain a first initial corrected displacement signal and a second initial corrected displacement signal; S341C7, under the condition A7, based on the equivalent displacement compensation quantity, performing initial correction operation on the first original displacement signal and the second original displacement signal in a cooperative manner to obtain a first initial corrected displacement signal and a second initial corrected displacement signal; S341C8, in case A8, uses the first original displacement signal as the first initial corrected displacement signal and uses the second original displacement signal as the second initial corrected displacement signal.
8. The method of claim 6, wherein performing a secondary correction operation on the initial correction result according to each of the second set of correction conditions to obtain a first final corrected displacement signal and a second final corrected displacement signal, comprises: S342D1, under the condition B1, based on the first correlation coefficient, the second correlation coefficient and the third correlation coefficient, performing a secondary correction operation on the first initial corrected displacement signal and the second initial corrected displacement signal in a cooperative manner to obtain a first final corrected displacement signal and a second final corrected displacement signal; S342D2, under the condition B2, based on the first correlation coefficient and the second correlation number, performing a secondary correction operation on the first initial corrected displacement signal and the second initial corrected displacement signal in a cooperative manner to obtain a first final corrected displacement signal and a second final corrected displacement signal; S342D3, under the condition B3, based on the first correlation coefficient and the third phase relation number, performing a secondary correction operation on the first initial corrected displacement signal and the second initial corrected displacement signal in a cooperative manner to obtain a first final corrected displacement signal and a second final corrected displacement signal; S342D4, under the condition B4, based on the first correlation coefficient, performing secondary correction operation on the first initial corrected displacement signal and the second initial corrected displacement signal in a cooperative manner to obtain a first final corrected displacement signal and a second final corrected displacement signal; S342D5, under the condition B5, based on the second correlation coefficient and the third phase relation number, performing a secondary correction operation on the first initial corrected displacement signal and the second initial corrected displacement signal in a cooperative manner to obtain a first final corrected displacement signal and a second final corrected displacement signal; S342D6, under the condition B6, based on the second correlation coefficient, performing secondary correction operation on the first initial corrected displacement signal and the second initial corrected displacement signal in a cooperative manner to obtain a first final corrected displacement signal and a second final corrected displacement signal; S342D7, under the condition B7, based on a third correlation coefficient, performing a secondary correction operation on the first initial corrected displacement signal and the second initial corrected displacement signal in a cooperative manner to obtain a first final corrected displacement signal and a second final corrected displacement signal; S342D8, in case B8, the first initial corrected displacement signal is taken as the first final corrected displacement signal, and the second initial corrected displacement signal is taken as the second final corrected displacement signal.
9. A system for correcting a rotor vibration displacement signal for performing a method for correcting a rotor vibration displacement signal according to any one of claims 1 to 8, comprising: The data acquisition module is used for synchronously acquiring a first original displacement signal and a second original displacement signal through the first displacement sensor and the second displacement sensor; the data processing module is connected with the data acquisition module and is used for aligning the first original displacement signal and the second original displacement signal according to time to form a two-dimensional track point set containing a plurality of data points; The correction module is connected with the data processing module and is used for calculating three characteristic parameters based on the two-dimensional track point set, respectively executing correction condition judgment on the first original displacement signal and the second original displacement signal according to the three characteristic parameters, and executing correction operation according to the judgment result to obtain a first final corrected displacement signal and a second final corrected displacement signal.

Description

Correction method and system for rotor vibration displacement signal Technical Field The present invention relates to the field of displacement signal correction technologies, and in particular, to a method and a system for correcting a rotor vibration displacement signal. Background In on-line monitoring systems of large rotary machines such as steam turbines, compressors and generators, two mutually orthogonal eddy current displacement sensors are generally adopted to synchronously acquire vibration displacement signals of a rotor in horizontal (X direction) and vertical (Y direction) directions, and an axis track is constructed by the vibration displacement signals and used for evaluating the stability, centering state and bearing health condition of the rotor. However, in actual operation, due to factors such as sensor installation errors, thermal deformation of a support, residual eccentricity of a rotor, inconsistent gain of a signal conditioning circuit, electromagnetic crosstalk and the like, the collected original displacement signal often contains a static offset component and a dynamic amplitude imbalance at the same time, so that the reconstructed axis track has integral drift, elliptical distortion or inclination of a main shaft, and the accuracy of fault diagnosis is seriously affected. The correction method commonly used at present mainly comprises two types, namely a single-parameter threshold value deduction method, for example, subtracting the mean value of an X or Y signal to eliminate direct current offset, and a fixed proportion amplitude normalization method, wherein the vibration amplitudes in the X and Y directions are forced to be equal. However, the methods have significant limitations that firstly, various deviations are assumed to be mutually independent and cannot handle complex working conditions of coexistence and even coupling of static deviation and amplitude unbalance, secondly, correction logic lacks integrity, when a plurality of characteristics are abnormal at the same time, a system cannot judge what combination strategy should be adopted, more importantly, the existing schemes are all disposable and open-loop correction, the actual contribution degree of each deviation source to the overall track form is not considered, and overcorrection or undercorrection is easy to generate under a weak abnormal or high noise scene, and particularly, the current technology lacks a structured two-stage correction mechanism, namely, basic numerical correction can be carried out based on clear physical parameters in a first stage, and self-adaptive refinement can be carried out according to the inherent relevance of the parameters and the overall track characteristics in a second stage. Therefore, a technical scheme of a method and a system for correcting a rotor vibration displacement signal is urgently needed in the prior art. Disclosure of Invention In order to solve the technical problems, an embodiment of the present invention provides a method for correcting a rotor vibration displacement signal, which specifically includes the following steps: s1, synchronously acquiring a first original displacement signal and a second original displacement signal through a first displacement sensor and a second displacement sensor; S2, aligning the first original displacement signal and the second original displacement signal according to time to form a two-dimensional track point set containing a plurality of data points; s3, based on a two-dimensional track point set, three characteristic parameters are obtained through calculation, correction condition judgment is respectively carried out on the first original displacement signal and the second original displacement signal according to the three characteristic parameters, correction operation is carried out according to judgment results, and a first final corrected displacement signal and a second final corrected displacement signal are obtained; the three characteristic parameters comprise an X-direction static offset, a Y-direction static offset and an equivalent displacement compensation; s31, calculating to obtain a composite characteristic parameter based on the X-direction static offset, the Y-direction static offset and the equivalent displacement compensation; S32, respectively calculating a first correlation coefficient between the X-direction static offset and the composite characteristic parameter, a second correlation coefficient between the Y-direction static offset and the composite characteristic parameter and a third correlation coefficient between the equivalent displacement compensation amount and the composite characteristic parameter; s33, setting a first threshold value for the X-direction static offset, a second threshold value for the Y-direction static offset, and a third threshold value for the equivalent displacement compensation; S34, judging the correction situation of the correction of the first original displac