A method and system for measuring electrical run-out of a steam turbine rotor, a storage medium and an electronic device

Abstract

A method, system, storage medium, and electronic equipment for measuring the electrical runout of a steam turbine rotor are disclosed. The measurement method includes: acquiring mechanical runout signals and combined runout signals of the rotor during rotation via a data acquisition module; transmitting the acquired rotor phase signals to the data acquisition module and synchronously calibrating the rotor phase with the acquired mechanical runout signals and combined runout signals via a phase synchronization control module; transmitting the mechanical runout, combined runout, and rotor phase signals to a signal processing module via the data acquisition module for processing to obtain the combined runout and mechanical runout of the rotor, and performing phase registration between the mechanical runout and combined runout; calculating the electrical runout from the acquired combined runout and mechanical runout using the signal processing module and outputting a phase diagram. This invention can simultaneously, quickly, and with high precision measure mechanical runout and combined runout, and analyze and calculate the electrical runout and the phase of each runout.

Description

Technical Field

[0001] This invention relates to the field of measurement technology, and in particular to a method, system, storage medium, and electronic device for measuring the electrical runout of a steam turbine rotor. Background Technology

[0002] A steam turbine is a prime mover that converts the thermal energy of steam or gas into the mechanical energy of its rotating rotor. The vibration and noise generated by the turbine rotor during operation directly affect the turbine's operational reliability. The turbine rotor, comprising the main shaft, impeller, moving blades, and coupling, is a key component of the turbine, ensuring energy conversion. Due to unavoidable machining errors during the production and manufacturing of turbine rotors, radial runout exists on its cross-section as it rotates around the main shaft. In industry, eddy current sensors are commonly used to detect this radial runout; this runout is called total runout or comprehensive runout. Comprehensive runout consists of two parts: one is the mechanical runout caused by machining errors during the machining process, primarily reflecting the non-roundness and coaxiality of the shaft; the other is the electrical runout caused by the uneven electromagnetic distribution on the turbine rotor surface after complex surface treatments such as high-temperature forging and laser cladding. Mechanical runout is defined as the difference between the maximum and minimum values ​​of the change in the mechanical surface profile relative to the main shaft, measured on a measuring section, during one revolution of the turbine rotor around the main shaft without axial movement. Correspondingly, electrical runout refers to the difference between the maximum and minimum readings of electromagnetic and stress characteristic changes, measured on a measuring section, during one revolution of the turbine rotor around the main shaft without axial movement. High-precision measurement of rotor runout is primarily achieved using eddy current sensors. However, the runout measured by these sensors is a composite runout, consisting of both mechanical and electrical runout. Generally, the synchronous measurement of mechanical and electrical runout is not considered; that is, it is assumed that the electrical runout can be obtained by subtracting the difference between the maximum and minimum mechanical runout readings from the composite runout. Therefore, only the high-precision measurement of mechanical runout needs to be addressed.

[0003] In existing technologies, there are two main methods for measuring rotor mechanical runout. The first is using a mechanical dial indicator. Traditional mechanical dial indicators include dial gauges and micrometers, with micrometers capable of reading down to the μm level. However, because the measuring head of this type of mechanical dial indicator is spherical, it cannot contact the smallest contour of the workpiece surface. Therefore, the data obtained during actual measurement is not accurate, and the accuracy of this method cannot reach the μm level. The second method is the measurement method using an electric measuring instrument based on a displacement sensor. The electric measuring instrument obtains analog quantities through a displacement sensor, which are then converted into digital quantities for display. That is, the measured signal is converted into changes in resistance, capacitance, and inductance, generating an electrical signal output, which is then amplified and displayed on a computer. The probe used in the electric measuring instrument is also a contact probe. After contacting the workpiece surface, the probe's displacement change is converted into an electrical signal input to the system and displayed on the panel. Because the contact probe used in the electric measuring instrument has a relatively sharp tip, it can solve the problem that traditional mechanical gauges cannot accurately express the contour changes of the part surface to a certain extent. However, it cannot collect data through a data acquisition card, so it cannot be a component of an integrated electrical runout testing instrument. It is only suitable for the rapid detection of the form and position tolerances of machined parts.

[0004] Furthermore, a Chinese invention patent with patent number "ZL202011109820.6" and titled "A Device and Method for Detecting Residual Electrical Dispersion of a High-Speed ​​Rotor of a Centrifugal Compressor" specifically discloses that "it includes a mounting frame, a placement mechanism, a detection mechanism, and a control panel. The placement mechanism, detection mechanism, and control panel are mounted on the mounting frame. The placement mechanism includes a second mounting plate, a third mounting plate, a first guide wheel, a second guide wheel, a third guide wheel, and a fourth guide wheel. The second and third mounting plates are vertically arranged on the mounting frame. When the rotor rotates, the detection mechanism can detect the residual electrical dispersion of the rotor. When the rotor rotates between the first and second guide wheels and between the third and fourth guide wheels, the sensor emits a signal and transmits it to the detection plate. Then, the detection plate feeds back the signal to the sensor. The electromagnetic field generated at the rotor end is transmitted to the detection plate, thereby eliminating the interference of the electromagnetic field generated at the rotor end on the electromagnetic field fed back by the sensor." This device obtains the electrical dispersion based on the difference between the electrical conductivity and magnetism on the material at the tip and end of the eddy current detection probe. However, this detection device fails to consider that the eddy current sensor actually measures a comprehensive runout that includes mechanical runout. Electrical runout can only be obtained after eliminating the deviation caused by mechanical runout. Therefore, this detection device has a significant flaw. From a practical application perspective, existing turbine rotor electrical runout measurement devices only support real-time data reading and cannot output a complete 360° phase detection report, which is inconvenient for data management and reduces detection efficiency. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a method, measurement system, storage medium and electronic equipment for measuring the electrical runout of a steam turbine rotor, which can simultaneously, quickly and with high precision measure the mechanical runout and the combined runout of the rotor, and calculate the electrical runout, the extreme values ​​of each runout and the phase of the extreme values ​​through computer analysis, and output a 360° phase diagram of the mechanical runout, electrical runout and combined runout of the rotor.

[0006] The first aspect of this invention provides a method for measuring the electrical runout of a steam turbine rotor, comprising:

[0007] The data acquisition module acquires the mechanical runout signal and the combined runout signal of the rotor during rotation. The phase synchronization control module acquires the phase signal identified during rotor rotation and transmits the phase signal to the data acquisition module. The phase signal is synchronized with the acquired mechanical runout signal and the combined runout signal to calibrate the rotor phase. The data acquisition module transmits the mechanical runout, the combined runout, and the rotor phase signal to the signal processing module for processing to acquire the combined runout and mechanical runout of the rotor. The mechanical runout and the combined runout are then phase-registered. The acquired combined runout and mechanical runout are used by the signal processing module to calculate the electrical runout, and a 360° phase diagram of the rotor's mechanical runout, electrical runout, and combined runout is output.

[0008] Preferably, the rotor is provided with a graduated stripe, and a magnet is provided at the joint of the stripe; the phase synchronization control module includes a phase triggering unit and a phase identification unit. The phase triggering unit obtains a trigger signal through the magnet, and the phase identification unit identifies the stripe to obtain a phase signal. The trigger signal and the phase signal are transmitted to the data acquisition module to calibrate the rotor phase synchronously with the mechanical runout signal and the comprehensive runout signal.

[0009] Preferably, in the process of acquiring the mechanical runout signal and the combined runout signal, the mechanical runout signal and the combined runout signal on the same cross section of the rotor are acquired through the data acquisition module; or, the mechanical runout signal and the combined runout signal on a parallel cross section of the rotor are acquired through the data acquisition module.

[0010] Preferably, the signal processing module includes a first processing unit and a second processing unit. The first processing unit preprocesses the mechanical runout signal, and the second processing unit preprocesses the comprehensive runout signal. The preprocessing results are then processed by a signal processing algorithm to obtain the comprehensive runout amount and the mechanical runout amount.

[0011] Preferably, the signal processing module further includes a third processing unit, to which the preprocessing result is transmitted. The third processing unit performs phase registration of mechanical runout and integrated runout through a matching algorithm, thereby determining the electrical runout.

[0012] Preferably, during the measurement process based on the same cross section, when the rotor rotates at a constant speed, the phase difference between the mechanical runout and the comprehensive runout is calculated and compensated through a data matching optimization algorithm; when the rotor rotates at a non-uniform speed, the phase is recorded and the phase difference between the mechanical runout and the comprehensive runout is compensated through the phase synchronization control module.

[0013] A second aspect of the present invention provides a measurement system for the electrical runout of a steam turbine rotor. The measurement system uses the measurement method described in any one of the first aspects to measure the electrical runout. The measurement system includes a data acquisition module for acquiring mechanical runout signals and composite signals of the rotor during rotation, a phase synchronization control module for identifying phase signals of the rotor during rotation, and a signal processing module for calculating the electrical runout amount. The phase synchronization control module, the data acquisition module, and the signal processing module are connected in sequence.

[0014] Preferably, the data acquisition module includes a first detection unit for detecting mechanical vibration signals, a second detection unit for detecting comprehensive vibration signals, and a rotatable clamping device. The first detection unit and the second detection unit are disposed on the clamping device, and the clamping device drives the first detection unit and the second detection unit to change their measurement posture.

[0015] Preferably, the first detection unit and the second detection unit are arranged at a certain angle, and both are arranged along the same measurement surface normal.

[0016] Preferably, the first detection unit and the second detection unit are installed along the normal to the measuring surface.

[0017] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the measurement method according to any one of the first aspects of the present invention.

[0018] A fourth aspect of the present invention provides an electronic device, the electronic device including a memory storing a computer program; and a processor communicatively connected to the memory, which executes the measurement method according to any one of the first aspects of the present invention when the computer program is invoked.

[0019] As described above, the method for measuring the electrical runout of a steam turbine rotor according to the present invention has the following beneficial effects:

[0020] The measurement method simultaneously acquires the mechanical runout signal and the combined runout signal of the rotor during rotation through a data acquisition module, and acquires the rotor phase signal through a phase synchronization control module. The rotor phase is calibrated under the combined action of the data acquisition module and the phase synchronization control module. The rotor phase signal, combined runout, and mechanical runout are processed by a signal processing module to register the combined runout and mechanical runout with the rotor phase signal. Finally, the electrical runout is calculated by the signal processing module. This invention can simultaneously, quickly, and with high precision measure the mechanical runout and combined runout of the rotor. Simultaneously, it analyzes and calculates the electrical runout and the phase of each runout, and outputs a phase diagram corresponding to the mechanical runout, electrical runout, and combined runout over 360° of the rotor, providing a clear visual representation of the measurement results. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating a method for measuring the electrical runout of a steam turbine rotor according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of a turbine rotor electrical runout measurement system provided in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the striped band.

[0024] Figure 4 This is a schematic diagram of synchronous measurement based on the same cross section.

[0025] Figure 5 This is a schematic diagram of synchronous measurement based on parallel cross sections.

[0026] Figure 6 This is a side view of a clamping device provided in an embodiment of the measurement system described in this invention.

[0027] Figure 7 This is a top view of a clamping device provided in an embodiment of the measurement system described in this invention.

[0028] Figure 8 The image shows the result of Fourier series fitting for mechanical jumping.

[0029] Figure 9 The image shows the result of the overall jump Fourier series fitting process.

[0030] Figure 10 This is a schematic diagram of the mechanism of the electronic device described in a specific embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Phase synchronization control module; 110. Phase triggering unit; 120. Phase identification unit; 130. Transmitting unit; 140. Receiving unit; 200. Data acquisition module; 210. First detection unit; 220. Second detection unit; 230. Signal conditioning unit; 240. Data acquisition unit; 300. Signal processing module; 310. First processing unit; 320. Second processing unit; 330. Third processing unit; 400. Clamping device; 410. Base; 420. Support part; 430. Fixing part; 500. Electronic device; 510. Memory; 520. Processor; 600. Stripe. Detailed Implementation

[0033] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0034] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0035] This invention provides an embodiment of a method for measuring the electrical runout of a steam turbine rotor. The measurement requires fixing the rotor to be tested on a machine tool and completing pre-measurement preparations. The measurement specifically includes:

[0036] S100, such as Figure 1 As shown, the data acquisition module 200 acquires the mechanical runout signal and the combined runout signal of the rotor during rotation, while the phase synchronization control module 100 acquires the phase signal identified during rotor rotation and transmits the rotor's phase signal to the data acquisition module 200 via wireless communication. It should be noted that there is no sequential order between acquiring the rotor's mechanical runout signal, the combined runout signal, and acquiring the phase signal; that is, the detection and acquisition of the mechanical runout signal, the combined runout signal, and the phase signal are completed simultaneously.

[0037] Furthermore, such as Figures 1-3As shown, to quickly acquire phase signals during rotor rotation, a graduated striped band 600 is provided on the rotor. The stripes on the striped band 600 are arranged in alternating black and white patterns, and the striped band 600 wraps around the rotor. A magnet is provided at the joint of the striped band 600, which serves two purposes: firstly, to fix the striped band 600, and secondly, to serve as the starting and ending points for rotor rotation calculation. Interval digital graduations are provided on one side of the stripes to guide the phase of rotor rotation. The stripe interval is determined according to the required phase resolution. The black and white stripes on the striped band 600 can be identified by the phase identification unit 120. The phase synchronization control module 100 includes a phase triggering unit 110, a phase identification unit 120, a transmitting unit 130, and a receiving unit 140. The phase triggering unit 110 and the phase identification unit 120 are connected to the transmitting unit 130, and the transmitting unit 130 is connected to the receiving unit 140. During measurement, as the rotor rotates, the phase triggering unit 110 acquires a trigger signal by sensing the magnet on the striped band 600 through a Hall sensor. The phase triggering unit 110 transmits the trigger signal to the transmitting end unit 130, and then transmits it to the receiving end unit 140 via wireless communication. The phase identification unit 120 identifies the black and white stripes of the striped belt 600 during rotor rotation to obtain the phase signal, and transmits this phase signal to the transmitting end unit 130, and then to the receiving end unit 140 via wireless communication, thereby completing the acquisition of mechanical vibration signal, comprehensive vibration signal, and phase signal. The phase identification unit 120 is preferably a color sensor. During detection, the Hall sensor is aligned with the magnet, and the phase identification unit is aligned with the striped belt 600. When the rotor rotates and the Hall sensor senses the magnet, the phase identification unit begins counting the black and white stripes on the striped belt 600, and simultaneously transmits the count representing the phase to the receiving end unit 140. The receiving end unit 140 then transmits the phase count value to the data acquisition module 200 for processing.

[0038] Furthermore, such as Figure 4 and Figure 5As shown, the data acquisition module 200 includes a first detection unit 210 and a second detection unit 220. The first detection unit 210 is used to detect mechanical runout signals, and the second detection unit 220 is used to detect combined runout signals. The first detection unit 210 is preferably a mechanical displacement sensor, and the second detection unit 220 is preferably an eddy current sensor. To meet the needs of different application scenarios, in the process of acquiring mechanical runout signals and combined runout signals, the first detection unit 210 and the second detection unit 220 can be used to simultaneously detect the rotor mechanical runout signals and combined runout signals along the radial direction of the same cross section. This avoids theoretical errors and saves axial space, and is suitable for measuring specific cross-sections of turbine rotors with short axial distances. Alternatively, the first detection unit 210 and the second detection unit 220 can be used to simultaneously detect the rotor mechanical runout signals and combined runout signals along the radial direction based on parallel cross-sections. The first detection unit 210 and the second detection unit 220 are simple to install and have high accuracy, and are suitable for rotors with long axial distances. It should be noted that when simultaneously measuring mechanical runout signal and composite runout signal at the same cross section, the included angle between the first detection unit 210 and the second detection unit 220 is θ, and the included angle θ is preferably 0° to 180° to facilitate measurement.

[0039] S200, such as Figure 2 As shown, the receiving unit 140 is connected to the data acquisition module 200. The receiving unit 140 transmits the acquired mechanical runout signal, comprehensive runout signal and phase signal to the data acquisition module 200. The data acquisition module 200 then uses the phase signal to synchronously calibrate the rotor phase with the acquired mechanical runout signal and comprehensive runout signal.

[0040] Specifically, the data acquisition module 200 further includes a signal conditioning unit 230 and a data acquisition unit 240. The first detection unit 210 and the second detection unit 220 are connected to the signal conditioning unit 230, the signal conditioning unit 230 is connected to the data acquisition unit 240, and the data acquisition unit 240 is connected to the receiving unit 140. The analog electrical signals acquired by the first detection unit 210 and the second detection unit 220 are processed by the signal conditioning unit 230 and then transmitted to the data acquisition unit 240. At the same time, the receiving unit 140 transmits the acquired rotor phase signal (i.e., the count value representing the phase) to the data acquisition unit 240. The data acquisition unit 240 is connected to a computer, and the computer performs reading matching between the phase signal and the mechanical runout signal detected by the first detection unit 210 and the comprehensive runout signal detected by the second detection unit 220 to obtain the values ​​of mechanical runout and comprehensive runout corresponding to different phases of the rotor.

[0041] S300, such as Figure 2As shown, the mechanical runout, the combined runout, and the rotor phase signal are transmitted to the signal processing module 300 through the data acquisition module 200 for processing. The combined runout and mechanical runout of the rotor are calculated, and the mechanical runout and the combined runout are phase-registered.

[0042] Specifically, the signal processing unit 300 includes a first processing unit 310, a second processing unit 320, and a third processing unit 330. Both the first and second processing units 310 and 320 are connected to the third processing unit 330. The first processing unit 310 performs digital filtering and other signal preprocessing on the mechanical runout signal input from the data acquisition module 200. The second processing unit 320 performs digital filtering and other signal preprocessing on the comprehensive runout signal input from the data acquisition module 200. The preprocessing results are then processed by a signal processing algorithm to obtain the comprehensive runout and mechanical runout. On one hand, the preprocessing results are provided to the signal processing algorithm for processing to obtain the comprehensive runout and mechanical runout of the rotor; on the other hand, the preprocessing results are provided to the third processing unit, where a phase matching algorithm is used to complete the phase registration of the mechanical runout and the comprehensive runout. It should be noted that, as... Figure 8 and Figure 9 As shown, during the preprocessing process of the first processing unit 310 and the second processing unit 320, preprocessing is completed through a 6-level Fourier series fitting, which can remove high-frequency noise. The phase matching algorithm is preferred, but not limited to, the least squares circle algorithm.

[0043] S400: The acquired combined runout and mechanical runout are used by the signal processing module 300 to calculate the electrical runout, and the phase diagram of the rotor's mechanical runout, electrical runout and combined runout over 360° is output. This phase diagram can be displayed on the screen.

[0044] It is important to emphasize that during the measurement of the same cross-section, due to the phase difference between mechanical runout and combined runout, it is necessary to separate the electrical runout from the combined runout using certain signal processing methods. When the rotor rotates at a constant speed, the data matching optimization algorithm provided by the first processing unit 310 and the second unit 320 calculates and compensates for the phase difference between the two sets of data: mechanical runout and combined runout. When the rotor rotates at a non-uniform speed, the phase synchronization control module 100 records the rotor phase to compensate for the phase difference between the mechanical runout and combined runout, that is, it records the phase based on the fringe method and compensates for the phase difference between the two sets of data.

[0045] After the phase difference is compensated by the first processing unit 310 and the second processing unit 320, the mechanical runout and the combined runout data are transmitted to the third processing unit 330 to obtain mechanical runout and combined runout data without phase difference. The third processing unit 330 removes the mechanical runout from the combined runout, that is, the combined runout amount minus the mechanical runout amount in the same phase, to obtain the electrical runout amount in the same phase.

[0046] Table 1

[0047] Experiment number Mechanical runout (μm) Overall fluctuation (μm) Electrical runout (μm) 1 7.3 6.22 4.52 2 7.7 6.44 3.53 3 8.4 6.50 5.23 4 7.7 5.28 3.80 5 6.8 5.92 3.88 average value 7.58 6.07 4.20 Standard deviation 0.53 0.45 0.61

[0048] Table 2

[0049] Experiment number Mechanical runout (μm) Overall fluctuation (μm) Electrical runout (μm) 1 7.4 6.28 6.1 1 2 7.6 6.85 5.73 3 7.8 6.21 5.98 4 5.7 5.54 5.12 5 6.6 6.35 5.55 average value 7.02 6.24 5.70 Standard deviation 0.78 0.42 0.35

[0050] The data in Tables 1 and 2 are measurement results based on synchronous measurement of parallel sections using the above measurement method. This invention can measure the mechanical runout and comprehensive runout in the same phase during rotor rotation with high precision, thereby obtaining high-precision electrical runout.

[0051] Based on the above description of the measurement method, this invention provides a measurement system for the electrical runout of a steam turbine rotor. This measurement system uses the aforementioned measurement method to measure the electrical runout, such as... Figure 2 As shown, the measurement system includes a data acquisition module 200 for acquiring mechanical runout signals and comprehensive runout signals of the rotor during rotation, a phase synchronization control module 100 for identifying phase signals of the rotor during rotation, and a signal processing module 300 for calculating electrical runout. The phase synchronization control module 100, data acquisition module 200, and signal processing module 300 are connected in sequence.

[0052] In one embodiment, such as Figure 6 and Figure 7 As shown, the data acquisition module includes a first detection unit 210 for detecting mechanical vibration signals, a second detection unit 220 for detecting comprehensive vibration signals, and a rotatable clamping device 400. The first detection unit 210 and the second detection unit 220 are mounted on the clamping device 400, and the clamping device 400 drives the first detection unit 210 and the second detection unit 220 to change their measurement posture.

[0053] Furthermore, such as Figure 6 and Figure 7As shown, the clamping device 400 includes a base 410, a support portion 420, and a fixing portion 430. The base 410 is fixed to a driving device, and the driving device drives the base 410 to rotate. One end of the support portion 420 is detachably fixed to the base 410, and the other end of the support portion 420 is provided with the fixing portion 430. A first detection unit 210 and a second detection unit 220 are provided on the fixing portion 430. The first detection unit 210 and the second detection unit 220 are installed along the normal to the measuring surface.

[0054] In use, the drive device can move the base 410 axially, thereby causing the probes of the first detection unit 210 and the second detection unit 220 to contact the position to be measured on the rotor. On the other hand, when mechanical runout and combined runout measurements based on the same cross-section are required, the drive device rotates the base 410 by a preset angle α, making the probes of the first detection unit 210 and the second detection unit 220 perpendicular to the measurement base surface. When mechanical runout and combined runout measurements based on a parallel cross-section are required, the drive device rotates the base 410 by a preset angle β, making the probes of the first detection unit 210 and the second detection unit 220 parallel to each other and perpendicular to the measurement base surface. By switching between parallel cross-section measurement postures and same cross-section measurement postures, the measurement of rotor electrical runout at different axial distances can be satisfied.

[0055] Based on the above description of the measurement method, the present invention also provides a computer-readable storage medium having a computer program stored thereon, the implementation of which is executed by a processor. Figure 1 The measurement method shown.

[0056] Based on the above description of the measurement method, the present invention also provides an electronic device, such as... Figure 10 As shown, in one embodiment of the present invention, the electronic device 500 includes a memory and a processor 520. The memory 510 stores a computer program, and the processor 520 is communicatively connected to the memory 510, executing the program when invoked. Figure 1 The measurement method shown.

[0057] In summary, this invention can simultaneously, quickly, and with high precision measure the mechanical runout and the combined runout of a rotor. It also calculates and analyzes the electrical runout and the phase of each runout, and outputs a phase diagram corresponding to the mechanical runout, electrical runout, and combined runout of the rotor over 360°, which can intuitively display the measurement results.

[0058] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for measuring the electrical runout of a steam turbine rotor, characterized in that, include: The data acquisition module acquires the mechanical runout signal and the combined runout signal of the rotor during rotation; the phase synchronization control module acquires the phase signal identified during rotor rotation and transmits the phase signal to the data acquisition module; the phase signal is synchronized with the acquired mechanical runout signal and the combined runout signal to calibrate the rotor phase; the data acquisition module transmits the mechanical runout signal, the combined runout signal, and the rotor phase signal to the signal processing module for processing to acquire the combined runout amount and the mechanical runout amount of the rotor, and performs phase registration between the mechanical runout amount and the combined runout amount; the acquired combined runout amount and the mechanical runout amount are used by the signal processing module to calculate the electrical runout amount, and outputs a phase diagram of the rotor's 360° mechanical runout amount, electrical runout amount, and combined runout amount; The rotor is equipped with a black and white striped band with scales. The stripes wrap around the rotor, and the scales are used to indicate the phase of the rotor's rotation. A magnet is provided at the joint of the stripes, and the magnet serves as the starting and ending point for calculating the rotor's rotation. The phase synchronization control module includes a phase triggering unit and a phase identification unit. The phase triggering unit obtains a trigger signal by sensing the magnet. The phase identification unit is a color sensor that identifies the black and white stripes of the stripe to obtain a phase signal. When the phase triggering unit senses the magnet, the phase identification unit starts counting the black and white stripes on the stripe. The count value represents the phase. The phase signal is transmitted to the data acquisition module to calibrate the rotor phase synchronously with the mechanical runout signal and the comprehensive runout signal.

2. The method for measuring the electrical runout of a steam turbine rotor according to claim 1, characterized in that, In the process of acquiring mechanical runout signals and combined runout signals, the data acquisition module acquires mechanical runout signals and combined runout signals on the same cross section of the rotor; or, the data acquisition module acquires mechanical runout signals and combined runout signals on parallel cross sections of the rotor.

3. The method for measuring the electrical runout of a steam turbine rotor according to claim 2, characterized in that, During the measurement process at the same cross section, when the rotor rotates at a constant speed, the phase difference between the mechanical runout and the combined runout is calculated and compensated through a data matching optimization algorithm; when the rotor rotates at a non-uniform speed, the phase is recorded and the phase difference between the mechanical runout and the combined runout is compensated through the phase synchronization control module.

4. The method for measuring the electrical runout of a steam turbine rotor according to claim 1, characterized in that, The signal processing module includes a first processing unit and a second processing unit. The first processing unit preprocesses the mechanical runout signal, and the second processing unit preprocesses the comprehensive runout signal. The preprocessing results are then processed by a signal processing algorithm to obtain the comprehensive runout amount and the mechanical runout amount.

5. The method for measuring the electrical runout of a steam turbine rotor according to claim 4, characterized in that, The signal processing module further includes a third processing unit, to which the preprocessing result is transmitted. The third processing unit performs phase registration of mechanical runout and integrated runout through a matching algorithm, and then calculates the electrical runout.

6. A measurement system for the electrical runout of a steam turbine rotor, characterized in that, The measurement system uses the measurement method described in any one of claims 1-5 to measure electrical runout. The measurement system includes: a data acquisition module for acquiring mechanical runout signals and comprehensive runout signals of the rotor during rotation; a phase synchronization control module for identifying phase signals of the rotor during rotation; and a signal processing module for calculating the amount of electrical runout. The phase synchronization control module, the data acquisition module, and the signal processing module are connected in sequence.

7. The measurement system for electrical runout of a steam turbine rotor according to claim 6, characterized in that, The data acquisition module includes a first detection unit for detecting mechanical vibration signals, a second detection unit for detecting comprehensive vibration signals, and a rotatable clamping device. The first detection unit and the second detection unit are mounted on the clamping device, and the clamping device drives the first detection unit and the second detection unit to change their measurement posture.

8. The measurement system for electrical runout of a steam turbine rotor according to claim 7, characterized in that, The first detection unit and the second detection unit are installed along the normal to the parallel measurement surface.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the measurement method according to any one of claims 1-5.

10. An electronic device, characterized in that, The electronic device includes: Memory, which stores computer programs; The processor, which is communicatively connected to the memory, executes the measurement method according to any one of claims 1-5 when the computer program is invoked.

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