A real-time measurement system and method for the blade tip circle profile of a rotating machinery rotor blade disk

Abstract

The present invention discloses a real-time measurement system and method for the blade tip circle profile of a rotary machinery rotor blade disk, comprising a blade disk to be measured, a sensor, a sensor driving and conditioning module, a blade tip clearance measurement module, a blade tip timing signal acquisition module, a blade number matching module, a key phase frequency division module and a blade tip circle profile measurement module, wherein the sensor is installed on a casing directly facing the blade disk to be measured, the sensor is connected to the sensor driving and conditioning module, the sensor driving and conditioning module is respectively connected to the blade tip clearance measurement module and the blade tip timing signal acquisition module, the blade tip clearance measurement module is connected to the blade number matching module, the blade tip timing signal acquisition module is connected to the key phase frequency division module, and the blade tip clearance measurement module, the blade number matching module, and the key phase frequency division module are all connected to the blade tip circle profile measurement module. The method of the present invention realizes the real-time positioning of each blade of the blade disk when the rotor rotates at high speed, and realizes the real-time measurement of the blade tip circle profile of the blade disk when the rotor rotates at high speed.

Description

Technical Field

[0001] The present invention relates to the field of state monitoring of rotating machinery, and in particular to a real-time measurement and system method of the blade tip circle profile of a rotor blade disk of a rotating machinery. Background Art

[0002] The rotor system is the main component of rotating machinery, and its operating status directly affects the working condition of rotating machinery. When the rotor rotates at high speed in the bearing, it not only rotates around its own center, but also vortexes around a certain center. Its motion trajectory is called the axis trajectory. The axis trajectory can intuitively and vividly characterize the rotor's operating status. When the rotor is normal, the axis trajectory is approximately a circle. When an abnormality occurs, the axis trajectory will be distorted. The operating status of the rotor system can be monitored by analyzing the axis trajectory, and the early signs of failure can be obtained. The specific cause of the failure can be analyzed, and then reasonable maintenance measures can be taken to prevent the further development of rotating machinery failures.

[0003] At present, the sensors near the support seat are mainly used to obtain two sets of rotor radial displacement signals measured in two mutually perpendicular directions at the same cross section, which are used for subsequent axis trajectory theoretical calculation, purification and identification to achieve axis trajectory measurement. However, due to structural limitations, the rotor operation state near the support seat is not the most obvious and intense part of the rotor system operation state. Therefore, the area near the support seat is not the optimal rotor system axis trajectory measurement position, and cannot best monitor the rotor system operation state.

[0004] The blade disk is the core working component of the rotor system, with a large moment of inertia. The axis trajectory at this position changes most dramatically and can best represent the operating state of the rotor system. However, in order to ensure the safe operation of the rotating machinery, the sensor cannot be inserted into the casing and directly installed on the rotor near the blade disk. The sensor needs to be installed on the casing facing the blade disk. The radial displacement of the blade disk is first obtained, and then the blade length is subtracted to obtain the axis trajectory at the blade disk. The premise of this method is that the lengths of the blades of the blade disk are the same and are regarded as constant deviations. However, due to manufacturing and installation errors, the lengths of the blades are different. The blade top circle contour formed by the end faces of the blades of the blade disk in the static state is not an ideal circle, which introduces errors and seriously affects the measurement accuracy of the axis trajectory at the blade disk, and thus affects the accuracy of subsequent rotating machinery fault monitoring.

[0005] Therefore, it is urgent to design a method and system to realize the real-time measurement of the blade tip circle profile of the blade disk when the rotor rotates at high speed, and use it to eliminate the influence of different blade lengths on the measurement of the axis trajectory at the blade disk, improve the measurement accuracy of the axis trajectory at the blade disk, and thus improve the accuracy of rotating machinery fault monitoring. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of insufficient accuracy in measuring the axis trajectory at the existing blade disk, and to provide a real-time measurement system and method for the blade tip circle profile of a rotating machinery rotor blade disk. The system and method can obtain the blade tip circle profile of the blade disk in real time, eliminate the influence of different blade lengths on the axis trajectory measurement at the blade disk, improve the accuracy of the axis trajectory measurement at the blade disk, and further can be used to improve the accuracy of fault diagnosis and early warning of rotating machinery rotors.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A real-time measurement system for the blade tip circle profile of a rotating machinery rotor blade disk, comprising a blade disk to be measured, a sensor, a sensor driving and conditioning module, a blade tip clearance measurement module, a blade tip timing signal acquisition module, a blade number matching module, a key phase frequency division module and a blade tip circle profile measurement module, wherein the sensor is installed on a casing directly facing the blade disk to be measured, the sensor is connected to the sensor driving and conditioning module, the sensor driving and conditioning module is respectively connected to the blade tip clearance measurement module and the blade tip timing signal acquisition module, the blade tip clearance measurement module is connected to the blade number matching module, the blade tip timing signal acquisition module is connected to the key phase frequency division module, and the blade tip clearance measurement module, the blade number matching module, and the key phase frequency division module are all connected to the blade tip circle profile measurement module;

[0009] The sensor is used to obtain the blade tip sensing signal of each blade on the impeller to be tested and transmit it to the sensor driving and conditioning module in sequence. The tip clearance measurement module is used to obtain the tip clearance of each blade. The signal acquisition module is used to extract the tip timing signal. The blade number matching module is used to realize the numbering of each blade. The key phase frequency division module is used to realize the positioning of each blade. The blade number identification matching module realizes the measurement of the top circle contour of the impeller by matching the tip clearance of each blade with the blade number one by one.

[0010] The present invention also provides a method for measuring based on the real-time measurement system of the blade tip circle profile of a rotary machinery rotor blade disk, comprising:

[0011] (1) Obtaining leaf fingerprints;

[0012] Assume that the number of blades in a complete circle of the impeller to be measured is N, and the blade numbers are defined as #0, #1, ..., #N-1; when the rotating machinery rotor is installed, shut down, repaired or debugged, the turning operation is performed, and it is assumed that the rotor does not generate vortex motion at this time, and the blade tip sensor signal A is obtained by using the sensor and the sensor drive and conditioning module; the sensor drive and conditioning module transmits the blade tip sensor signal A to the blade tip clearance measurement module to obtain the blade tip clearance A; the blade tip clearance A of each blade is expressed as:

[0013] {d}=(d0,d1,...,d i ,...d N-1) (1)

[0014] Where i is the set leaf number, which corresponds to the actual leaf one by one, and d i represents the tip clearance of blade #i, i=0,1,…,N-1;

[0015] Assume that the distance between the center of the blade disk to be measured, i.e. the axis of the blade disk, and the sensor is R, and the length of each blade is expressed as:

[0016] {r}=(r0,r1,...,r i ,...,r N-1 ) (2)

[0017] Where i is the set leaf number, which corresponds to the actual leaf one by one, r i Indicates the length of blade #i, i=0,1,…,N-1;

[0018] The relationship between the tip clearance A and the length of each blade is expressed as:

[0019] {r}=R-{d} (3)

[0020] Define the sequence of formula (3) as the leaf fingerprint;

[0021] (2) obtaining blade tip clearance B and blade tip timing signal;

[0022] When the rotor is working normally, the blade tip sensing signal B is obtained by using the sensor and the sensor driving and conditioning module; and the blade tip sensing signal B is transmitted to the blade tip clearance measurement module, and the blade tip clearance B is obtained by using the peak-to-peak value of the blade tip sensing signal B. The blade tip clearance B of each blade is expressed as:

[0023] {d'}=(d0',d2',...,d' k ,...) (4)

[0024] Where k is a positive integer, d' k represents the kth blade tip clearance B;

[0025] The blade tip sensor signal B is also transmitted to the blade tip timing acquisition module. The voltage comparator in the blade tip timing signal acquisition module is used to select a voltage comparison threshold that is not higher than the peak value of the blade tip sensor signal B, and the blade tip sensor signal B is converted into a blade tip timing signal. The blade tip timing signal is obtained as follows:

[0026] {V}=(V0,V1,...,V k ,...) (5)

[0027] Where k is a positive integer, V k represents the tip timing signal corresponding to the kth tip clearance B;

[0028] (3) Matching blade numbers;

[0029] In the blade number matching module, the maximum correlation coefficient principle is adopted to perform correlation matching between the blade fingerprint map and the blade tip clearance B, and the optimal matching point between the blade fingerprint map and the blade tip clearance B is found by traversal;

[0030] (4) Locate the blade number;

[0031] The key phase frequency division module is used to perform N-frequency division processing on the blade number matching result, and the tip timing signal of a blade among the N blades of the blade disk to be tested is extracted, and it is defined as the tip timing signal of the positioning blade;

[0032] (5) Measure the blade tip circle profile of the blade disk;

[0033] In the blade tip circle profile measurement module, the blade tip circle profile of the blade disk is measured using the blade tip clearance B obtained by the blade tip clearance measurement module, the blade number obtained by the blade number matching module, and the blade tip timing signal of the positioning blade obtained by the key phase frequency division module.

[0034] Furthermore, step (3) is specifically as follows:

[0035] (301) In data d' k Then, M consecutive data in the tip clearance B are taken to form a subsequence {d' kM}=(d' k ,d' k+1 ,...,d' k+m ,...d' k+M-1 ), where m = 0, 1, 2, ..., M-1, M ≥ N;

[0036] (302) Take the correlation coefficient as the objective function. When M ≥ 2N, define the objective function:

[0037]

[0038] When M<2N, define the objective function:

[0039]

[0040] in, n is the number of rotations of the blade disk, r i represents the length of the blade corresponding to blade #i, r j represents the length of the jth blade, j = 0, 1, ..., N-1; (m+j)%N represents the remainder of (m+j) divided by N;

[0041] (303) Traverse the value of m, from m = 0 to m = N-1, calculate the size of the objective function, maximize the objective function, and obtain the value of m. At this time, the leaf fingerprint spectrum and the tip clearance B achieve the best match, that is, d' k+m Corresponding to blade #0, d' k+m+1 Corresponding to leaf #1, and so on, the leaf number matching process of N leaves is completed.

[0042] Furthermore, step (5) specifically includes:

[0043] (501) obtaining a blade tip timing signal of a positioning blade through a key phase frequency division module, and using it as a starting point of a matching cycle;

[0044] (502) The blade tip timing signal of the positioning blade corresponds to a blade tip clearance B in the blade tip clearance measurement module;

[0045] (503) using the blade numbers determined in step (3), one-to-one correspondence is established between the N blades and the N blade tip gaps B;

[0046] (504) Connecting the points corresponding to the N blade tip clearances B obtained thereby obtains a blade tip circle contour starting from the positioning blade.

[0047] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0048] (1) The present invention proposes a blade number identification method that combines the blade tip clearance and the blade tip timing signal, thereby realizing the real-time positioning of each blade of the blade disk when the rotor rotates at high speed.

[0049] (2) The present invention proposes a method for measuring the blade tip circle profile of a blade disk in combination with the blade tip clearance and the blade number, thereby realizing real-time measurement of the blade tip circle profile of the blade disk when the rotor rotates at high speed.

[0050] (3) The method proposed in the present invention can be used to eliminate the influence of the different lengths of the blades of the impeller on the measurement of the axis trajectory of the impeller, thereby improving the measurement accuracy of the axis trajectory of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1a This is a schematic diagram of the structure of the real-time measurement system for the blade tip circle profile of the blisk.

[0052] Figure 1b It is a schematic diagram of measurement performed by the blade disk tip circle profile real-time measurement system in this embodiment.

[0053] Figure 2 Schematic diagram of leaf fingerprint results.

[0054] Figure 3This is a schematic diagram of the blade tip timing signal acquisition results, where the upper side is the blade tip sensor signal B and the lower side is the blade tip timing signal.

[0055] Figure 4 This is a schematic diagram of the matching results of the blade number matching module, where the upper side is the tip clearance B and the lower side is a schematic diagram of the blade number matching results.

[0056] Figure 5 It is a schematic diagram of the frequency division result of the key phase frequency division module, where the upper side is the blade tip clearance B and the lower side is the schematic diagram of the blade positioning result.

[0057] Figure numerals: 1-blade disk to be tested, 2-sensor, 3-sensor driving and conditioning module, 4-blade tip clearance measurement module, 5-blade tip timing signal acquisition module, 6-blade number matching module, 7-key phase frequency division module, 8-blade top circle profile measurement module, 9-blade fingerprint acquisition module. DETAILED DESCRIPTION

[0058] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0059] like Figure 1a As shown, a real-time measurement system for the blade tip circle profile of a rotating machinery rotor blade disk includes a blade disk to be measured 1, a sensor 2, a sensor driving and conditioning module 3, a blade tip clearance measurement module 4, a blade tip timing signal acquisition module 5, a blade number matching module 6, a key phase frequency division module 7 and a blade tip circle profile measurement module 8, wherein the sensor 2 is installed on a casing directly opposite to the blade disk to be measured, the sensor 2 is connected to the sensor driving and conditioning module 3, the sensor driving and conditioning module 3 is respectively connected to the blade tip clearance measurement module 4 and the blade tip timing signal acquisition module 5, the blade tip clearance measurement module 4 is connected to the blade number matching module 6, the blade tip timing signal acquisition module 5 is connected to the key phase frequency division module 7, and the blade tip clearance measurement module 4, the blade number matching module 6, and the key phase frequency division module 7 are all connected to the blade tip circle profile measurement module 8;

[0060] When measuring by the above-mentioned measurement system, it is necessary to measure the blade tip sensor signals of the blade disc to be measured when it is cranked or at low speed and when it is in normal operation. Therefore, when the blade disc to be measured is in the cranked or low speed state, the blade disc to be measured 1, the sensor 2, the sensor driving and conditioning module 3, and the blade tip clearance measurement module 4 are used together as the blade fingerprint acquisition module 9; see Figure 1b .

[0061] In this embodiment, the blade tip sensor signal obtained under cranking or low speed is defined as blade tip sensor signal A, and the blade tip sensor signal obtained under normal operation of the rotor is defined as blade tip sensor signal B. The blade tip clearance obtained through blade tip sensor signal A is defined as blade tip clearance A, and the blade tip clearance obtained through blade tip sensor signal B is defined as blade tip clearance B.

[0062] In the blade fingerprint acquisition module 9, the sensor 2 is installed on the casing of the blade disk 1 to be tested, and is connected to the sensor drive and conditioning module 3. When the blade sweeps over the sensor 2 during turning or low speed, the sensor drive and conditioning module 3 will output the blade tip sensor signal A. The blade tip clearance measurement module 4 is connected to the sensor drive and conditioning module 3, and the blade tip sensor signal A is input into the blade tip clearance measurement module 4 and is used to extract the blade tip clearance A of each blade. The blade tip clearance A is used to form the blade fingerprint library of the blade disk 1 to be tested.

[0063] The sensor 2 is installed on the casing of the blade disk 1 to be tested, and is connected to the sensor drive and conditioning module 3. When the rotor is working normally, when the blade sweeps over the sensor 2, the sensor drive and conditioning module 3 will output the blade tip sensing signal B. The blade tip clearance measurement module 4 and the blade tip timing signal acquisition module 5 are respectively connected to the sensor drive and conditioning module 3. The blade tip sensing signal B is input into the blade tip clearance measurement module 4 and is used to extract the blade tip clearance B of each blade; it is input into the blade tip timing signal acquisition module 5 and is used to extract the blade tip timing signal.

[0064] The blade number matching module 6 is connected to the blade tip clearance measurement module 4 and the blade fingerprint spectrum acquisition module 9 respectively. The tip clearance A and the tip clearance B are correlated and matched according to the maximum correlation coefficient principle. The blade tip clearances of the blades are different to distinguish the blades and realize the numbering of the blades. The key phase frequency division module 7 is connected to the blade tip timing signal acquisition module 5, and performs frequency division processing on the blade tip timing signal to realize the extraction of the blade tip timing signal of the positioning blade and realize the positioning of each blade.

[0065] The blade tip circle profile measurement module 8 is connected to the blade tip clearance measurement module 4 and the blade number matching module 6 respectively, and the blade tip clearance B of each blade is matched with the blade number one by one to achieve the measurement of the blade tip circle profile of the blade disk.

[0066] Specifically, the method for measuring the blade tip circle profile of the rotating machinery rotor blade disk based on the above-mentioned real-time measurement system comprises the following steps:

[0067] (1) Obtaining leaf fingerprints;

[0068] Assume that the number of blades in a full circle of the blade disk 1 to be tested is N, and define the blade numbers as #0, #1, ..., #N-1. In the blade fingerprint acquisition module 9, the sensor 2 is installed on the casing of the blade disk 1 to be tested, and is connected to the sensor drive and conditioning module 3. When the rotating machinery rotor is installed, shut down, repaired or debugged, the turning operation can be performed, and the blade tip sensor signal A is obtained by using the sensor 2 and the sensor drive and conditioning module 3. The sensor drive and conditioning module 3 is connected to the blade tip clearance measurement module 4, and the blade tip sensor signal A is transmitted to the blade tip clearance measurement module 4 to obtain the blade tip clearance A. Due to the low speed, it can be considered that the rotor does not generate vortex motion at this time, and the blade tip clearance A of each blade can be expressed as:

[0069] {d}=(d0,d1,...,d i ,...d N-1 ) (1)

[0070] Where i is the set leaf number, which corresponds to the actual leaf one by one, and d i Represents the tip clearance of blade #i, i=0,1,…,N-1.

[0071] Assume that the distance between the center of the blade disk, i.e. the axis of the blade disk, and the sensor 2 is R. Due to manufacturing and installation errors, there are slight differences in the lengths of the blades, which can be expressed as:

[0072] {r}=(r0,r1,...,r i ,...,r N-1 ) (2)

[0073] Where i is the set leaf number, which corresponds to the actual leaf one by one, r i Represents the length of blade #i, i=0,1,…,N-1.

[0074] The relationship between the tip clearance A and the length of each blade can be expressed as:

[0075] {r}=R-{d} (3)

[0076] Since there are slight differences in the length of each leaf, each leaf can be characterized. Therefore, the sequence of formula (3) is defined as the leaf fingerprint. The schematic diagram of the leaf fingerprint acquisition result is shown in Figure 2 shown.

[0077] (2) obtaining blade tip clearance B and blade tip timing signal;

[0078] The sensor 2 is installed on the casing of the blade disk 1 to be measured, and is connected to the sensor drive and conditioning module 3. When the rotor is working normally, the blade tip sensing signal B is obtained by using the sensor 2 and the sensor drive and conditioning module 3, and the sensor drive and conditioning module 3 is connected to the blade tip clearance measurement module 4 and the blade tip timing acquisition module 5 respectively.

[0079] The blade tip sensor signal B is transmitted to the blade tip clearance measurement module 4, and the blade tip clearance B is obtained by using the peak-to-peak value of the blade tip sensor signal B. The blade tip clearance B of each blade can be expressed as:

[0080] {d'}=(d0',d2',...,d' k ,...) (4)

[0081] Where k is a positive integer, d' k represents the kth blade tip clearance B.

[0082] The blade tip sensor signal B is transmitted to the blade tip timing acquisition module 5. The voltage comparison threshold not higher than the peak value of the blade tip sensor signal B is selected by the voltage comparator in the blade tip timing signal acquisition module 5 to convert the blade tip sensor signal B into a blade tip timing signal. Figure 3 As shown, the blade tip timing signal is obtained as:

[0083] {V}=(V0,V1,...,V k ,...) (5)

[0084] Where k is a positive integer, V k represents the blade tip timing signal corresponding to the kth blade tip gap B.

[0085] (3) Match the blade number;

[0086] In the blade number matching module 6, the blade fingerprint map is correlated with the blade tip clearance B, and the optimal matching point is found by traversing using the maximum correlation coefficient principle. The specific method is as follows:

[0087] (301) In data d' k Then, M consecutive data in the tip clearance B are taken to form a subsequence {d' kM}=(d' k ,d' k+1 ,...,d' k+m ,...d' k+M -1), where m = 0, 1, 2, ..., M-1, M ≥ N

[0088] (302) Take the correlation coefficient as the objective function. When M ≥ 2N, define the objective function:

[0089]

[0090] When M<2N, define the objective function:

[0091]

[0092] in, n is the number of rotations of the blade disk, ri represents the length of the blade corresponding to blade #i, r j represents the length of the jth blade, and (m+j)%N represents the remainder of (m+j) divided by N.

[0093] (303) Traverse the value of m, from m = 0 to m = N-1, calculate the size of the objective function, maximize the objective function, and obtain the value of m. At this time, the leaf fingerprint spectrum and the tip clearance B achieve the best match, that is, d' k+m Corresponding to blade #0, d' k+m+1 Corresponding to blade #1, and so on, the leaf number matching process of N leaves is completed. The matching result diagram of the leaf number matching module 6 is as follows: Figure 4 shown.

[0094] (4) Locate the blade number;

[0095] The key phase frequency division module 7 is used to perform N frequency division processing on the blade number matching result, and the tip timing signal of a blade in the N blades of the blade disk to be tested is extracted, and it is defined as the tip timing signal of the positioning blade; Figure 5 For example, if the tip timing signal of blade #0 is extracted, the matching tip timing signal of blade #0 is defined within a matching cycle, and the next pulse of blade #0 is determined every N-1 pulses with this pulse as the reference point, so that the tip timing signal of blade #0 can be extracted.

[0096] (5) Measure the blade tip circle profile of the blade disk

[0097] In the blade tip circle profile measurement module 8, the blade tip clearance B obtained by the blade tip clearance measurement module 4, the blade number obtained by the blade number matching module 6, and the blade tip timing signal of the positioning blade obtained by the key phase frequency division module 7 are comprehensively processed. Specifically as follows:

[0098] (501) The blade tip timing signal of the positioning blade (for example, blade #0) is obtained through the key phase division module 7 and is set as the starting point of a matching cycle.

[0099] (502) The blade tip timing signal of the positioning blade corresponds to a blade tip clearance B in the blade tip clearance measurement module 4.

[0100] (503) By using the blade numbers determined in step (3), the N blades are matched one-to-one with the N blade tip gaps B.

[0101] (504) By connecting the points corresponding to the N blade tip clearances B obtained, a blade disk blade tip circle contour starting from the positioning blade can be obtained.

[0102] For example, the tip timing signal of blade #0 has been extracted through the key phase division module 7, and the tip clearance B of blade #0 can be inferred. Then, the tip clearance measurement module 4 and the blade number matching module 6 use the tip timing signal and tip clearance B of blade #0 as a reference to make a one-to-one correspondence between N blades and N tip clearances B. The corresponding points of the obtained N tip clearances B are connected to obtain the top circle contour of the blade disk in the current matching period.

[0103] Finally, it should be pointed out that the above examples are only used to illustrate the calculation process of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above examples, a person skilled in the art should understand that the calculation process described in the above examples can still be modified, or some parameters can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding calculation method deviate from the spirit and scope of the calculation method of the present invention.

[0104] The present invention is not limited to the embodiments described above. The above description of the specific embodiments is intended to describe and illustrate the technical solution of the present invention. The above specific embodiments are merely illustrative and not restrictive. Without departing from the scope of the present invention and the scope of protection of the claims, a person of ordinary skill in the art can also make many forms of specific changes under the guidance of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A method for measuring the blade tip circle profile of a rotating mechanical rotor blade disk based on a real-time measurement system for the blade tip circle profile of a rotating mechanical rotor blade disk, comprising a blade disk to be measured, a sensor, a sensor driving and conditioning module, a blade tip clearance measurement module, a blade tip timing signal acquisition module, a blade number matching module, a key phase frequency division module and a blade tip circle profile measurement module, wherein the sensor is installed on a casing of the blade disk to be measured, the sensor is connected to the sensor driving and conditioning module, the sensor driving and conditioning module is respectively connected to the blade tip clearance measurement module and the blade tip timing signal acquisition module, the blade tip clearance measurement module is connected to the blade number matching module, the blade tip timing signal acquisition module is connected to the blade tip timing signal acquisition module, the blade tip clearance measurement module is connected to the blade number matching module, and the blade tip timing signal acquisition module is connected to the blade tip timing signal acquisition module. The signal acquisition module is connected with the key phase frequency division module, and the tip clearance measurement module, the blade number matching module and the key phase frequency division module are all connected with the blade top circle profile measurement module; the sensor is used to obtain the blade tip sensor signal of each blade on the blade disk to be measured and transmit it to the sensor driving and conditioning module in sequence, the tip clearance measurement module is used to obtain the tip clearance of each blade, and the signal acquisition module is used to extract the tip timing signal; the blade number matching module is used to realize the numbering of each blade, the key phase frequency division module is used to realize the positioning of each blade, and the blade number identification matching module realizes the measurement of the blade top circle profile of the blade disk by matching the tip clearance of each blade with the blade number one by one; it is characterized in that include: (1) Obtaining leaf fingerprints; Assume that the number of blades in a complete circle of the impeller to be measured is N, and the blade numbers are defined as #0, #1, ..., #N-1; when the rotating machinery rotor is installed, shut down, repaired or debugged, the turning operation is performed, and it is assumed that the rotor does not generate vortex motion at this time, and the blade tip sensor signal A is obtained by using the sensor and the sensor drive and conditioning module; the sensor drive and conditioning module transmits the blade tip sensor signal A to the blade tip clearance measurement module to obtain the blade tip clearance A; the blade tip clearance A of each blade is expressed as: {d}=(d0,d1,...,d i ,...d N-1 ) (1) Where i is the set leaf number, which corresponds to the actual leaf one by one, d i represents the tip clearance of blade #i, i=0,1,…,N-1; Assume that the distance between the center of the blade disk to be measured, i.e. the axis of the blade disk, and the sensor is R, and the length of each blade is expressed as: {r}=(r0,r1,...,r i ,...,r N-1 ) (2) Where i is the set leaf number, which corresponds to the actual leaf one by one, r i Indicates the length of blade #i, i=0,1,…,N-1; The relationship between the tip clearance A and the length of each blade is expressed as: {r}=R-{d} (3) The sequence of formula (3) is defined as the leaf fingerprint; (2) obtaining blade tip clearance B and blade tip timing signal; When the rotor is working normally, the blade tip sensing signal B is obtained by using the sensor and the sensor driving and conditioning module; and the blade tip sensing signal B is transmitted to the blade tip clearance measurement module, and the blade tip clearance B is obtained by using the peak-to-peak value of the blade tip sensing signal B. The blade tip clearance B of each blade is expressed as: {d'}=(d'0,d'2,...,d' k ,...) (4) Where k is a positive integer, d' k represents the kth blade tip clearance B; The blade tip sensor signal B is also transmitted to the blade tip timing acquisition module. The voltage comparator in the blade tip timing signal acquisition module is used to select a voltage comparison threshold that is not higher than the peak value of the blade tip sensor signal B, and the blade tip sensor signal B is converted into a blade tip timing signal. The blade tip timing signal is obtained as follows: {V}=(V0,V1,...,V k ,...) (5) Where k is a positive integer, V k represents the tip timing signal corresponding to the kth tip clearance B; (3) Match the blade number; In the blade number matching module, the maximum correlation coefficient principle is used to correlate the blade fingerprint map with the blade tip clearance B, and the optimal matching point between the blade fingerprint map and the blade tip clearance B is found by traversal; the details are as follows: (301) In data d' k Then, M consecutive data in the tip clearance B are taken to form a subsequence {d' kM }=(d' k ,d' k+1 ,...,d' k+m ,...d' k+M-1 ), where m = 0, 1, 2, ..., M-1, M ≥ N; (302) Take the correlation coefficient as the objective function. When M ≥ 2N, define the objective function: When M<2N, define the objective function: in, n is the number of rotations of the blade disk, r i represents the length of the blade corresponding to blade #i, r j represents the length of the jth blade, j = 0, 1, ..., N-1; (m+j)%N means the remainder when (m+j) is divided by N; (303) Traverse the value of m, from m = 0 to m = N-1, calculate the size of the objective function, maximize the objective function, and obtain the value of m. At this time, the leaf fingerprint spectrum and the tip clearance B achieve the best match, that is, d' k+m Corresponding to blade #0, d' k+m+1 Corresponding to leaf #1, and so on, the leaf number matching process of N leaves is completed (4) Locate the blade number; The key phase frequency division module is used to perform N-frequency division processing on the blade number matching result, and the tip timing signal of a blade among the N blades of the blade disk to be tested is extracted, and it is defined as the tip timing signal of the positioning blade; (5) Measure the blade tip circle profile of the blade disk; In the blade tip circle profile measurement module, the blade tip circle profile of the blade disk is measured using the blade tip clearance B obtained by the blade tip clearance measurement module, the blade number obtained by the blade number matching module, and the blade tip timing signal of the positioning blade obtained by the key phase frequency division module.

2. The method for measuring based on the real-time measurement system of the blade tip circle profile of the rotary machinery rotor blade disk according to claim 1 is characterized in that: Step (5) specifically includes: (501) obtaining a blade tip timing signal of a positioning blade through a key phase frequency division module, and using it as a starting point of a matching cycle; (502) The blade tip timing signal of the positioning blade corresponds to a blade tip clearance B in the blade tip clearance measurement module; (503) using the blade numbers determined in step (3), one-to-one correspondence is established between the N blades and the N blade tip gaps B; (504) Connecting the points corresponding to the N blade tip clearances B obtained thereby obtains a blade tip circle contour starting from the positioning blade.

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