Rotor critical speed test system, test method and readable storage medium

Abstract

The application provides a rotor critical speed test system, a test method and a readable storage medium. The rotor critical speed test system comprises a displacement sensor, a rack and a control unit. The rack has an axis, and the rack is used for rotatably arranging a rotor thereon around the axis. The displacement sensor is arranged along the axial direction of the rack and is used for spacing a predetermined interval from one end of the rotor. The displacement sensor is used for acquiring axial displacement data of the rotor when the rotor rotates and sending the axial displacement data to the control unit. The control unit is configured to obtain time domain data and frequency domain data according to the axial displacement data acquired by the displacement sensor, and determine a critical speed interval of the rotor based on the time domain data and the frequency domain data. In this way, the critical speed interval of the rotor can be determined based on the time domain data and the frequency domain data, and the test result is accurate and reliable.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a rotor critical speed testing system, testing method, and readable storage medium. Background Technology

[0002] Magnetic levitation rotor systems offer significant advantages in specific applications due to their reduced mechanical support, lack of lubrication, and frictionless operation, leading to their widespread use in mechanisms such as energy storage flywheels and centrifuges. Domestic and international scholars have analyzed the critical speed of magnetic levitation rotors using the transfer matrix method, finite element method, and co-simulation. However, the variable stiffness characteristics of the magnetic levitation rotor system introduce errors due to stiffness equivalence. Furthermore, during rotor system operation, factors such as the actual electromagnetic force-displacement relationship, structural stiffness and mass, and system damping can cause discrepancies between the actual critical speed and the analytical results, resulting in differences between the simulated and actual values. Therefore, testing the critical speed is necessary. The test results are crucial for correcting the finite element simulation model, designing structural vibration reduction schemes, and adjusting magnetic field control parameters. Summary of the Invention

[0003] The purpose of this invention is to provide a rotor critical speed testing system, testing method, and readable storage medium to solve the problem of inaccurate rotor critical speed simulation analysis results in existing systems.

[0004] To solve the above-mentioned technical problems, the present invention provides a rotor critical speed testing system, which includes: a displacement sensor, a frame and a control unit;

[0005] The frame has an axis, and the frame is used for rotatably mounting the rotor about the axis thereon;

[0006] The displacement sensor is arranged along the axial direction of the frame and is used to be spaced at a predetermined distance from one end of the rotor;

[0007] The displacement sensor is used to acquire axial displacement data of the rotor when the rotor rotates and send it to the control unit;

[0008] The control unit is configured to obtain time-domain data and frequency-domain data based on the axial displacement data acquired by the displacement sensor, and to determine the critical speed range of the rotor based on the time-domain data and the frequency-domain data.

[0009] Optionally, the rotor critical speed testing system includes multiple displacement sensors, which are uniformly distributed circumferentially around the axis.

[0010] Optionally, the control unit is configured to obtain the tilt angle of the rotor relative to the axis based on multiple axial displacement data acquired by the multiple displacement sensors.

[0011] Optionally, the displacement sensor is adjustable in position along the axial direction of the frame.

[0012] Optionally, the rotor critical speed testing system further includes a slide table and a sensor mounting bracket. The slide table is disposed on the frame along the axis, and the sensor mounting bracket is movably connected to the slide table along the slide table. The displacement sensor is disposed on the sensor mounting bracket and moves relative to the slide table with the sensor mounting bracket.

[0013] Optionally, the rotor critical speed testing system further includes an elbow clamp, which is mounted on the frame and is used to fix the stator corresponding to the rotor.

[0014] Optionally, the critical speed testing system includes two or more elbow clamps, which are arranged along the axial direction of the frame to fix the stator along the axial direction of the frame; the two or more elbow clamps are evenly distributed around the axis.

[0015] Optionally, the control unit is configured to determine that the current rotational speed of the rotor is within the critical speed range when the axial displacement value of the rotor exceeds a preset range in the time domain data and the maximum displacement value is located at the 1X fundamental frequency in the frequency domain data.

[0016] Optionally, the critical speed test system further includes a rotor drive unit, which is communicatively connected to the control unit. The rotor drive unit is used to send the rotor speed control data to the control unit; the control unit obtains the current rotor speed based on the speed control data.

[0017] To address the aforementioned technical problems, the present invention also provides a method for testing the critical speed of a rotor, comprising:

[0018] Obtain the axial displacement data of the rotor rotating around the axis;

[0019] Time-domain data and frequency-domain data are obtained based on the axial displacement data;

[0020] Based on the time-domain data and the frequency-domain data, the critical speed range of the rotor is determined.

[0021] Optionally, the method for determining the critical speed range of the rotor based on the time-domain data and the frequency-domain data includes:

[0022] In the time domain data, when the axial displacement value of the rotor exceeds the preset range, and in the frequency domain data, the maximum displacement value is located at the 1X fundamental frequency, it is determined that the current rotational speed of the rotor is within the critical rotational speed range.

[0023] Optionally, the rotor critical speed test method further includes:

[0024] Acquire multiple axial displacement data that are uniformly distributed around the axis in the circumferential direction;

[0025] The distance between the detection points of the plurality of axial displacement data and the axis is obtained;

[0026] Based on the multiple axial displacement data and the distance, the tilt angle of the rotor relative to the axis is obtained.

[0027] Optionally, the step of obtaining the frequency domain data based on the axial displacement data includes filtering and performing a fast Fourier transform on the axial displacement data to obtain the frequency domain data.

[0028] To address the aforementioned technical problems, the present invention also provides a readable storage medium storing a program thereon, wherein when the program is executed, the rotor critical speed test method described above is implemented.

[0029] In summary, in the rotor critical speed testing system, testing method, and readable storage medium provided by the present invention, the rotor critical speed testing system includes: a displacement sensor, a frame, and a control unit; the frame has an axis, and the frame is used for rotatably mounting a rotor around the axis; the displacement sensor is arranged along the axial direction of the frame and is used to be spaced at a predetermined distance from one end of the rotor; the displacement sensor is used to acquire axial displacement data of the rotor when the rotor rotates and send it to the control unit; the control unit is configured to obtain time-domain data and frequency-domain data based on the axial displacement data acquired by the displacement sensor, and determine the critical speed range of the rotor based on the time-domain data and the frequency-domain data.

[0030] This configuration allows for the acquisition of axial displacement data during rotor rotation via displacement sensors. The control unit then uses this axial displacement data to obtain time-domain and frequency-domain data. Based on this data, the critical speed range of the rotor can be determined, resulting in accurate and reliable test results. This overcomes the problem of inaccurate simulation analysis results for rotor critical speed in some cases. Furthermore, the tilt angle of the rotor at each moment can be obtained, making it particularly suitable for magnetically levitated rotors in medical equipment. This provides conditions for subsequent structural design optimization and magnetic field control parameter optimization. Attached Figure Description

[0031] Those skilled in the art will understand that the accompanying drawings are provided to better understand the invention and do not constitute any limitation on the scope of the invention. Wherein:

[0032] Figure 1 This is a schematic diagram of the rotor critical speed testing system according to an embodiment of the present invention;

[0033] Figure 2 This is a perspective view of the rotor critical speed testing system according to an embodiment of the present invention;

[0034] Figure 3 This is a partial top view of the rotor critical speed testing system according to an embodiment of the present invention;

[0035] Figure 4 This is a flowchart of the rotor critical speed test method according to an embodiment of the present invention.

[0036] In the attached image:

[0037] 1-Displacement sensor; 2-Frame; 3-Control unit; 4-Rotor; 5-Slide table; 6-Sensor mounting bracket; 7-Elbow clamp; 8-Stator; 9-Rotor drive unit. Detailed Implementation

[0038] To make the objectives, advantages, and features of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clarify the explanation of the embodiments of this invention. Furthermore, the structures shown in the drawings are often part of the actual structures. In particular, different figures may emphasize different aspects and may sometimes use different scales.

[0039] As used in this invention, the singular forms “a,” “an,” and “the” include plural objects; the term “or” is generally used to mean “and / or”; the term “a number” is generally used to mean “at least one”; and the term “at least two” is generally used to mean “two or more”. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature; “one end” and “the other end,” and “proximal end” and “distal end” generally refer to two corresponding parts, which include not only endpoints. Furthermore, the terms "installed," "connected," and "attached," as used in this invention, and the term "set" on one element from another, should be interpreted broadly. They generally only indicate a connection, coupling, cooperation, or transmission relationship between the two elements, which can be direct or indirect through an intermediate element. They should not be construed as indicating or implying a spatial relationship between the two elements, meaning one element can be located inside, outside, above, below, or to one side of another element, unless otherwise explicitly stated. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances. Additionally, directional terms such as above, below, up, down, upward, downward, left, and right are used relative to exemplary embodiments as shown in the figures, with upward or upper directions pointing towards the top of the corresponding figure, and downward or lower directions pointing towards the bottom of the corresponding figure.

[0040] The purpose of this invention is to provide a rotor critical speed testing system, testing method, and readable storage medium to solve the problem of inaccurate rotor critical speed simulation analysis results in existing systems.

[0041] The following description refers to the accompanying drawings.

[0042] The inventors discovered that in the design process of rotors for some mechanical bearings, existing technologies often use simulation analysis to calculate their critical speeds. Traditional rotor dynamics analysis methods require treating structural components along the rotor's load-bearing path as equivalent mass and stiffness elements, creating a simplified rotor model, and then using a rotor-support dynamics analysis model to systematically analyze the rotor's critical speed, mode shape, unbalanced response, and stability. This method, developed over decades, is relatively mature and can be easily integrated into various finite element simulation software, enabling convenient and rapid prediction of the rotor's critical speed during rotor design.

[0043] However, in some special applications, such as in certain medical devices, magnetic levitation rotors are used. Due to the differences between their dynamic equations and those of traditional mechanical bearings, and the nonlinearity of the support stiffness of magnetic levitation rotors within the operating speed range, the electromagnetic support stiffness of the rotor is coupled with the rotor displacement in actively controlled magnetic levitation systems. The rotor's support stiffness will continuously change during operation. If the finite element simulation analysis method is used, the equivalent stiffness will differ greatly from the actual stiffness, making it difficult to draw reliable conclusions. This results in a difference between the actual critical speed range and the simulation analysis results.

[0044] Based on this, please refer to Figures 1 to 3 This invention provides a rotor critical speed testing system, comprising: a displacement sensor 1, a frame 2, and a control unit 3; the frame 2 has an axis A, and the frame 2 is used for a rotor 4 to be rotatably mounted on the axis A; the displacement sensor 1 is arranged along the axial direction of the frame 2 and is used to be spaced at a predetermined distance from one end of the rotor 4; the displacement sensor 1 is used to acquire axial displacement data of the rotor 4 when the rotor 4 rotates, and send it to the control unit 3; the control unit 3 is configured to obtain time-domain data and frequency-domain data based on the axial displacement data acquired by the displacement sensor 1, and determine the critical speed range of the rotor 4 based on the time-domain data and the frequency-domain data.

[0045] The critical speed range of rotor 4 refers to the speed range in which rotor 4 experiences strong vibrations. When the speed of rotor 4 is within the critical speed range, it will generate relatively strong vibrations, affecting the normal operation of the rotating system (including rotor 4 and stator 8, etc.). Therefore, by directly testing the critical speed of rotor 4, the critical speed range can be determined intuitively through the vibration peak value during rotor 4 operation, and the structural components and control system parameters of the rotating system can be optimized accordingly.

[0046] Based on the rotor critical speed testing system described above, this embodiment of the invention also provides a rotor critical speed testing method, which includes:

[0047] Step S1: Obtain the axial displacement data of the rotor 4 rotating around axis A;

[0048] Step S2: Obtain time-domain data and frequency-domain data based on the axial displacement data;

[0049] Step S3: Based on the time domain data and the frequency domain data, determine the critical speed range of the rotor 4.

[0050] It should be noted that the axial displacement data here refers to the real-time runout displacement value of rotor 4 along axis A. The time-domain data is the change history of the axial displacement of rotor 4 over time during its movement. Figure 1 P1 in the diagram exemplifies a time-domain data example, with the horizontal axis representing time (in seconds) and the vertical axis representing axial displacement (in mm). The 0 value of the vertical axis can be set according to actual conditions. For example, when the rotor 4 is stationary and has not started rotating, the predetermined distance between the rotor 4 and the displacement sensor 1 can be set as the 0 value of the vertical axis, with the axial movement of the rotor 4 towards the displacement sensor 1 as the negative direction of the vertical axis and the axial movement of the rotor 4 away from the displacement sensor 1 as the positive direction of the vertical axis.

[0051] Optionally, in step S2, the step of obtaining the frequency domain data based on the axial displacement data includes filtering and performing a Fast Fourier Transform (FFT) on the axial displacement data to obtain the frequency domain data. The frequency domain data refers to the frequency characteristics of the vibration signal of rotor 4. For example... Figure 1 P2 in the example shows a frequency domain data plot, with the horizontal axis representing frequency (in Hz) and the vertical axis representing the axial displacement after FFT transformation (in mm).

[0052] Furthermore, based on the time-domain and frequency-domain data, the current vibration mode of rotor 4 can be determined, and the critical speed range of rotor 4 can be identified. The method for determining the critical speed range of the rotor based on the time-domain and frequency-domain data in step S3 includes:

[0053] Those skilled in the art know that for a rotating system, the waveform of its vibration can be decomposed by Fourier transform into a 1X fundamental frequency wave plus multiple higher frequency waves (such as 2X frequency, 3X frequency, etc.), where the higher frequency waves are integer multiples of the 1X fundamental frequency wave. In the time-domain data, when the axial displacement value of the rotor 4 exceeds a preset range, and in the frequency-domain data, the maximum displacement value is located at the 1X fundamental frequency, it is determined that the current rotational speed of the rotor 4 is within the critical speed range. It is understood that the preset range here can be set differently depending on the rotating system, such as... Figure 1 In the time-domain data graph shown in P1, the preset range can be ±10mm. It can be seen that the current axial displacement value of rotor 4 in P1 exceeds the preset range, and the current rotational speed of rotor 4 falls within the critical speed range. Further, it can be understood that if the time-domain signal shows that the peak value of rotor 4's vibration suddenly increases (exceeding the preset range) within a certain speed range, and then rapidly decreases (within the preset range) after crossing that speed range, and observing the frequency domain signal of rotor 4 shows that the vibration is dominated by the 1X fundamental frequency component, then it can be determined that this speed range is the critical speed range of the rotor.

[0054] In one example, the method for determining the critical speed range of the rotor based on the time-domain data and the frequency-domain data in step S3 can be implemented by the control unit 3.

[0055] Please continue to refer to this. Figure 1 and Figure 2 Optionally, the displacement sensor 1 is adjustable along the axial position of the frame 2. To ensure that the displacement sensor 1 is at an ideal working distance relative to the rotor 4 and to avoid data failure due to exceeding the measurement range, the height of the mounting plane of the displacement sensor 1 needs to be adjusted. The displacement sensor 1 can be selected from laser displacement sensors, ultrasonic displacement sensors, or Hall displacement sensors, etc., and this embodiment is not limited to this.

[0056] In an exemplary embodiment, the rotor critical speed testing system further includes a slide 5 and a sensor mounting bracket 6. The slide 5 is disposed on the frame 2 along the direction of axis A, and the sensor mounting bracket 6 is movably connected to the slide 5 along the slide 5. The displacement sensor 1 is disposed on the sensor mounting bracket 6 and moves relative to the slide 5 with the sensor mounting bracket 6. In a more specific example, the movement adjustment of the sensor mounting bracket 6 can be achieved by screws disposed relative to the slide 5.

[0057] Optionally, the rotor critical speed testing system further includes an elbow clamp 7, which is disposed on the frame 2 and is used to fix the stator 8 corresponding to the rotor 4. Preferably, the critical speed testing system includes two or more elbow clamps 7, which are arranged along the axial direction of the frame 2 and are used to fix the stator 8 along the axial direction of the frame 2; the two or more elbow clamps 7 are evenly distributed around the axis A. Figure 2 In the illustrated example, the critical speed test system includes two opposing elbow clamps 7, which the operator can use to quickly clamp the stator 8 for easy replacement of the rotating system to be tested.

[0058] Please refer to Figure 3 Preferably, the rotor critical speed testing system includes multiple displacement sensors 1, which are uniformly distributed circumferentially around the axis A. Further, the control unit 3 is configured to obtain the tilt angle of the rotor 4 relative to the axis A based on multiple axial displacement data acquired by the multiple displacement sensors 1.

[0059] Optionally, the rotor critical speed test method further includes:

[0060] Step S4: Obtain multiple axial displacement data that are uniformly distributed around axis A in the circumferential direction;

[0061] Step S5: Obtain the distance between the detection points of the plurality of axial displacement data and the axis A;

[0062] Step S6: Based on the multiple axial displacement data and the distance, obtain the tilt angle of the rotor 4 relative to the axis A.

[0063] Based on the multiple axial displacement data acquired in real time by the displacement sensors 1, the tilt angle of the rotor 4 at each moment can be calculated. Obtaining the change data of the tilt angle of the rotor 4 allows for the verification of the electromagnetic drive control parameters, thereby providing a reference for subsequent electromagnetic system design optimization.

[0064] The following is combined with Figure 3 Taking a rotor critical speed testing system including three displacement sensors 1a, 1b, and 1c as an example, the calculation of the tilt angle of rotor 4 relative to axis A is illustrated in the following way:

[0065] Using the plane containing displacement sensors 1a, 1b, and 1c as the reference plane, and the intersection of axis A and this reference plane as the origin, a three-dimensional coordinate system is established on the reference plane with the direction passing through the first displacement sensor 1a and the origin as the x-axis, the direction perpendicular to the x-axis and passing through the origin as the y-axis, and axis A as the z-axis. Then:

[0066]

[0067]

[0068] Where, θ x Let θ be the tilt angle of rotor 4 relative to axis A in the x-axis direction. y Let Δz1 be the axial displacement data measured by the first displacement sensor 1a, Δz2 be the axial displacement data measured by the second displacement sensor 1b, Δz3 be the axial displacement data measured by the third displacement sensor 1c, and R be the distance between displacement sensors 1a, 1b, and 1c and the origin of the coordinate system.

[0069] It should be noted that the number of displacement sensors 1 is not limited to three. Those skilled in the art can set the number of displacement sensors 1 according to actual needs. However, it is understood that one displacement sensor 1 is sufficient to monitor the axial displacement data of the rotor 4, and at least three displacement sensors 1 are sufficient to monitor the tilt angle of the rotor 4 relative to the axis A.

[0070] Optionally, the rotor critical speed testing system further includes a rotor drive unit 9, which is communicatively connected to the control unit 3. The rotor drive unit 9 is used to send the speed control data of the rotor 4 to the control unit 3; the control unit 3 obtains the current speed of the rotor 4 based on the speed control data. The rotor drive unit 9 controls the speed of the rotor 4 by sending speed control data to the rotor 4. Optionally, the rotor drive unit 9 accelerates and decelerates according to a predetermined speed control law, for example, accelerating to the maximum speed on a ramp or step, and then decelerating. Figure 4 P3 in the example shows a graph of speed control data, with time (in seconds) on the horizontal axis and speed (in RPM) on the vertical axis.

[0071] Based on the rotor critical speed testing method described above, this embodiment of the invention also provides a readable storage medium storing a program that, when executed, implements the steps of the rotor critical speed testing method described above. The readable storage medium can be integrated into the control unit 3 or attached independently. Furthermore, this embodiment of the invention also provides a control unit 3, which includes a processor and the readable storage medium described above, the processor being used to execute the program stored on the readable storage medium. In one example, the control unit 3 may be a computer. Of course, those skilled in the art can select other suitable devices as the control unit 3 according to existing technology, and this invention is not limited thereto.

[0072] In summary, in the rotor critical speed testing system, testing method, and readable storage medium provided by the present invention, the rotor critical speed testing system includes: a displacement sensor, a frame, and a control unit; the frame has an axis, and the frame is used for rotatably mounting a rotor around the axis; the displacement sensor is arranged along the axial direction of the frame and is used to be spaced at a predetermined distance from one end of the rotor; the displacement sensor is used to acquire axial displacement data of the rotor when the rotor rotates and send it to the control unit; the control unit is configured to obtain time-domain data and frequency-domain data based on the axial displacement data acquired by the displacement sensor, and determine the critical speed range of the rotor based on the time-domain data and the frequency-domain data.

[0073] This configuration allows for the acquisition of axial displacement data during rotor rotation via displacement sensors. The control unit then uses this axial displacement data to obtain time-domain and frequency-domain data. Based on this data, the critical speed range of the rotor can be determined, resulting in accurate and reliable test results. This overcomes the problem of inaccurate simulation analysis results for rotor critical speed in some cases. Furthermore, the tilt angle of the rotor at each moment can be obtained, making it particularly suitable for magnetically levitated rotors in medical equipment. This provides conditions for subsequent structural design optimization and magnetic field control parameter optimization.

[0074] It should be noted that the above embodiments can be combined with each other. The above description is only a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A rotor critical speed testing system, characterized in that, include: Displacement sensor, frame and control unit; The frame has an axis, and the frame is used for rotatably mounting the rotor about the axis thereon; The displacement sensor is arranged along the axial direction of the frame and is used to be spaced at a predetermined distance from one end of the rotor; The displacement sensor is used to acquire the axial displacement data of the rotor when the rotor rotates, and send it to the control unit; The control unit is configured to obtain time-domain data and frequency-domain data based on the axial displacement data acquired by the displacement sensor, and determine the critical speed range of the rotor based on the time-domain data and the frequency-domain data; wherein, in the time-domain data, when the axial displacement value of the rotor exceeds a preset range, and in the frequency-domain data, the maximum displacement value is located at 1X fundamental frequency, the current speed of the rotor is determined to be within the critical speed range.

2. The rotor critical speed testing system according to claim 1, characterized in that, The rotor critical speed testing system includes multiple displacement sensors, which are evenly distributed circumferentially around the axis.

3. The rotor critical speed testing system according to claim 2, characterized in that, The control unit is configured to obtain the tilt angle of the rotor relative to the axis based on multiple axial displacement data acquired by the multiple displacement sensors.

4. The rotor critical speed testing system according to claim 1, characterized in that, The displacement sensor is adjustable along the axial position of the frame.

5. The rotor critical speed testing system according to claim 4, characterized in that, The rotor critical speed testing system further includes a slide table and a sensor mounting bracket. The slide table is disposed on the frame along the axis, and the sensor mounting bracket is movably connected to the slide table along the slide table. The displacement sensor is disposed on the sensor mounting bracket and moves relative to the slide table with the sensor mounting bracket.

6. The rotor critical speed testing system according to claim 1, characterized in that, The rotor critical speed testing system also includes an elbow clamp, which is mounted on the frame and is used to fix the stator corresponding to the rotor.

7. The rotor critical speed testing system according to claim 6, characterized in that, The critical speed testing system includes two or more elbow clamps, which are arranged along the axial direction of the frame to fix the stator along the axial direction of the frame; the two or more elbow clamps are evenly distributed around the axis.

8. The rotor critical speed testing system according to claim 1, characterized in that, It also includes a rotor drive unit, which is communicatively connected to the control unit. The rotor drive unit is used to send the rotor speed control data to the control unit; the control unit obtains the current rotor speed based on the speed control data.

9. A method for testing the critical speed of a rotor, characterized in that, include: Obtain the axial displacement data of the rotor rotating around the axis; Time-domain data and frequency-domain data are obtained based on the axial displacement data; Based on the time-domain data and the frequency-domain data, the critical speed range of the rotor is determined; wherein, in the time-domain data, when the axial displacement value of the rotor exceeds a preset range, and in the frequency-domain data, the maximum displacement value is located at the 1X fundamental frequency, the current speed of the rotor is determined to be within the critical speed range.

10. The rotor critical speed testing method according to claim 9, characterized in that, The rotor critical speed test method also includes: Acquire multiple axial displacement data that are uniformly distributed around the axis in the circumferential direction; The distance between the detection points that acquire the plurality of axial displacement data and the axis; Based on the multiple axial displacement data and the distance, the tilt angle of the rotor relative to the axis is obtained.

11. The rotor critical speed testing method according to claim 9, characterized in that, The step of obtaining the frequency domain data based on the axial displacement data includes filtering and performing a fast Fourier transform on the axial displacement data to obtain the frequency domain data.

12. A readable storage medium having a program stored thereon, characterized in that, When the program is run, it implements the rotor critical speed test method according to any one of claims 9 to 11.

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