A method and device for pre-tightening and non-contact identification of a face gear pull rod rotor

Abstract

The application discloses a kind of end face gear pull rod rotor pre-tightening mistuning non-contact identification method and device, utilize laser irradiation to end face gear pull rod rotor pull rod, collect the laser signal reflected back by pull rod;Data processing is carried out to laser signal, and the vibration characteristic parameter of pull rod is obtained;Based on the change of the vibration characteristic parameter of pull rod, pre-tightening mistuning pull rod is identified.The application can avoid the influence of contact type measurement additional mass, measurement result is more accurate, and measurement frequency range is wide, device is simplified, and operation is simple.

Description

Technical Field

[0001] This invention belongs to the field of mechanical structure health status detection technology, specifically relating to a non-contact identification method and device for preload mistuning of an end-face toothed disc tie rod rotor. Background Technology

[0002] The end-face toothed disc tie rod rotor is a critical component of heavy-duty gas turbines. Uneven tie rod preload disrupts rotor symmetry, leading to reduced rotor strength and margin, and even fatigue failure. Therefore, designing a method and device to identify uneven tie rod preload is crucial for the integrity and operational safety of gas turbine rotors.

[0003] Uneven preload is a common problem in circumferentially distributed tie rod rotors, which may be caused by factors such as machining errors, installation errors, and variable operating conditions. Researchers have proposed different methods for monitoring bolt preload. Chinese patent application CN202310743626.0 discloses a method for identifying the preload state of disc-type rotors in aero-engines. By judging whether there is a large shift in the sensitive natural frequency, the preload state of the mating surfaces of disc-type rotors can be identified in engineering. However, the core of this patent is the coupled vibration analysis of the tie rod and the disc. In practice, multi-disc combined tie rod rotors mainly exhibit disc vibration, and the tie rod vibration mode is generally difficult to detect. Chinese patent application CN202310424537.X proposes a method for measuring the preload of small-sized bolts based on piezoelectric ultrasonic resonance. By using the functional relationship between bolt preload and ultrasonic resonance frequency shift, the ultrasonic resonance frequency shift of the bolt under test can be substituted into the calculation to obtain the preload of the bolt under test. However, the identification method is relatively cumbersome, and its practical feasibility in multi-tie rod operations is low. Chinese patent application CN116735040A discloses a resonant self-sensing bolt loosening monitoring device and method. This method involves placing an inductor at the nut and a capacitor at the bolt, forming a resonant circuit. The frequency of the resonant circuit is monitored in real time to determine bolt loosening. However, this method requires bolt fabrication and design, altering the bolt structure and increasing manufacturing costs. The device is complex, difficult to operate, and changes to the device structure can easily lead to detection errors. Chinese patent application CN116839877A discloses a bolt loosening detection method based on frequency band energy attenuation. This method collects vibration signals from the bolt end in different sub-frequency bands, calculates the energy of the bolt end signal in each sub-frequency band, and uses the energy attenuation as an indicator of bolt loosening. However, this method is inefficient, costly, computationally intensive, and has a limited frequency measurement range. Summary of the Invention

[0004] The purpose of this invention is to provide a non-contact identification method and device for preload detuning of end face toothed rod rotor, so as to overcome the defects of the existing technology. This invention can avoid the influence of the additional mass of contact measurement, the measurement results are more accurate, and the frequency measurement range is wide. The device is simple and easy to operate.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A non-contact method for identifying preload mistuning of an end-face toothed disc tie rod rotor includes the following steps:

[0007] The laser signal is collected by irradiating the tie rod of the end face toothed rotor with a laser and collecting the laser signal reflected back from the tie rod.

[0008] The laser signal is processed to obtain the vibration characteristic parameters of the pull rod;

[0009] Based on the changes in the vibration characteristic parameters of the tie rod, preloaded mistunted tie rods are identified.

[0010] Furthermore, the step of using laser light to illuminate the tie rod of the end-face geared rotor and collecting the laser signal reflected back from the tie rod specifically includes:

[0011] Based on the laser Doppler principle, the laser emitted by the laser vibrometer is irradiated onto the tie rod of the end face toothed rotor, and the output signal of the laser and the reflected laser signal are collected simultaneously.

[0012] Furthermore, the step of using laser to irradiate the tie rod of the end face toothed rotor includes: passing the emitted laser through the meshing gap of the end face teeth and then hitting the circumferential tie rod of the end face toothed rotor.

[0013] Furthermore, the acquisition of the laser signal reflected back by the pull rod includes: using a force hammer to excite the end face toothed disc pull rod rotor, and acquiring the laser signal reflected back by the circumferential pull rod of the end face toothed disc pull rod rotor.

[0014] Furthermore, the data processing of the laser signal includes: processing and analyzing the laser signal through a velocity recorder, a digital signal processor, a filter, and a signal converter.

[0015] Furthermore, the identification of preloaded mistuned tie rods based on changes in the vibration characteristic parameters of the tie rod specifically includes:

[0016] Based on a pre-established tie rod preload beam model, the tie rod frequency under different preload states is calculated according to theoretical formulas.

[0017] Based on the calculated mapping relationship between the preload and the frequency of the tie rod, the changes in the vibration characteristic parameters of the tie rod are compared to determine whether the tie rod is detuned.

[0018] Furthermore, the calculation of the rod frequency under different preload states includes the following cases:

[0019] (a) Modal frequency of the tie rod with uniform preload;

[0020] (b) The modal frequency of the tie rod after the preload of one tie rod is completely released;

[0021] (c) Modal frequencies of the tie rods after randomly releasing 10%-20% of the preload of all tie rods using the Monte Carlo method.

[0022] A non-contact identification device for preload mistuning of an end-face toothed disc pull rod rotor includes an experimental equipment body and a data acquisition and analysis module;

[0023] The main body of the experimental equipment includes an end-face toothed disc pull rod rotor. The end-face toothed disc pull rod rotor includes a rotor left wheel disc, a rotor first-stage wheel disc, a rotor second-stage wheel disc, a rotor third-stage wheel disc, a rotor fourth-stage wheel disc, a rotor right wheel disc, and a shaft head connected in sequence. Each stage of the end-face toothed disc pull rod rotor has pull rod holes evenly arranged along the circumferential direction of the wheel disc near the wheel rim. Each stage of the wheel disc is connected by circumferential pull rods passing through the pull rod holes.

[0024] The data acquisition and analysis module includes a laser vibrometer, and the output of the laser vibrometer is sequentially connected to a velocity recorder, a digital signal processor, a filter, and a signal converter.

[0025] Furthermore, there are gaps at the meshing points of the end faces of the various levels of discs.

[0026] Furthermore, one end of the circumferential tie rod is locked with a tie rod nut to form a flexible discontinuous system.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] This invention presents a non-contact identification method for preload mistuning of an end-face toothed disc pull rod rotor. Based on laser vibration measurement technology, a laser beam passes through the end-face teeth and strikes the pull rod of the rotor, while simultaneously collecting the laser signal reflected back from the pull rod. After signal data processing, the vibration characteristic parameters of the pull rod are obtained. Due to changes in the pull rod's preload, the frequency changes compared to a uniformly preloaded pull rod. By identifying this frequency change, the preload mistuning pull rod is determined. The laser vibration measurement technology used in this invention is a non-contact vibration measurement technique, which avoids the influence of the added mass in contact measurements, resulting in more accurate measurement results. It also eliminates issues such as sensor placement and wiring, simplifying experimental equipment and decoupling the disc vibration and pull rod vibration. Furthermore, the identification method described in this invention has a wide frequency measurement range and can meet the needs of a large number of measurement points. The resolution of the laser vibration meter can reach below 0.01 micrometers, enabling precise measurement of the pull rod vibration frequency. The device is compact and easy to operate. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the non-contact identification device for pre-tightening mistuning of the end face toothed disc pull rod rotor described in this invention;

[0030] Figure 2 This is a schematic diagram of the end face toothed disc pull rod rotor described in this invention;

[0031] Figure 3 This is a schematic diagram of the end face tooth meshing clearance of the end face toothed disc pull rod rotor described in this invention;

[0032] Figure 4 This is a flowchart of the identification process described in this invention;

[0033] Figure 5 The diagram shows the modal analysis of the end face toothed disc rotor rod described in this invention, wherein (a) is the first-order modal diagram of the rod in a uniform preload state, (b) is the second-order modal diagram of the rod in a uniform preload state, (c) is the first-order modal diagram of the rod with a preload completely released, and (d) is the second-order modal diagram of the rod with a preload completely released.

[0034] Figure 6 This is a beam model diagram of the circumferential tie rod of the end face toothed disc rotor described in this invention;

[0035] Figure 7 This is a comparison chart of the calculated and theoretical values ​​of the modal frequencies of each of the 12 tie rods of the rotor, which are randomly loosened by 10%-20% of the preload using the Monte Carlo method as described in this invention. Among them, (a) is a comparison chart of the first-order modal frequencies of the circumferential tie rod, and (b) is a comparison chart of the second-order modal frequencies of the circumferential tie rod.

[0036] Figure 8 The invention describes the use of the Monte Carlo method to randomly loosen the preload of all 12 tie rods of the rotor by 10%-20%, resulting in a reduction rate of the first-order and second-order modal frequencies of each tie rod.

[0037] In the figure, the rotor is shown as follows: 1. End face geared disc pull rod rotor; 2. Pull rod nut; 3. Rotor left wheel disc; 4. Rotor first stage wheel disc; 5. Rotor second stage wheel disc; 6. Rotor third stage wheel disc; 7. Rotor fourth stage wheel disc; 8. Rotor right wheel disc; 9. Circumferential pull rod; 10. Shaft head; 11. Force hammer; 12. Laser vibration meter; 13. Speed ​​recorder; 14. Digital signal processor; 15. Filter; 16. Signal converter; 17. Gap. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] This invention provides a non-contact method for identifying preload mistuning of an end-face toothed disc tie rod rotor, comprising the following steps:

[0040] A laser is used to irradiate the tie rod of the end face toothed rotor 1, and the laser signal reflected back from the tie rod is collected.

[0041] The laser signal is processed to obtain the vibration characteristic parameters of the pull rod;

[0042] Based on the changes in the vibration characteristic parameters of the tie rod, preloaded mistunted tie rods are identified.

[0043] This invention presents a non-contact identification method for preload mistuning of an end-face toothed disc pull rod rotor. Based on laser vibration measurement technology, a laser beam passes through the end-face teeth and strikes the pull rod of the end-face toothed disc pull rod rotor 1. Simultaneously, the laser signal reflected back from the pull rod is collected. After signal data processing, the vibration characteristic parameters of the pull rod are obtained. Due to the change in the pull rod's preload force, compared to a uniformly preloaded pull rod, the frequency change is used to determine the preload mistuning pull rod. The laser vibration measurement technology used in this invention is a non-contact vibration measurement technology, which avoids the influence of the added mass in contact measurements, resulting in more accurate measurement results. It also eliminates problems such as sensor placement and wiring, simplifying experimental equipment and decoupling the disc vibration and pull rod vibration. Furthermore, the identification method described in this invention has a wide frequency measurement range and can meet the needs of a large number of measurement points. The resolution of the laser vibration meter can reach below 0.01 micrometers, achieving accurate measurement of the pull rod vibration frequency. The device is simple and easy to operate.

[0044] Specifically, the implementation of the identification method of the present invention is as follows:

[0045] Based on the laser Doppler principle, the laser emitted by the laser vibrometer 12 passes through the meshing gap of the end face teeth and irradiates the target to be measured, namely the circumferential tie rod of the end face toothed rotor. At the same time, the hammer 11 excites the end face toothed rotor 1. The output signal of the laser and the laser signal reflected back by the circumferential tie rod 9 are collected synchronously by the digital laser vibrometer. The Doppler frequency shift signal after beam interference is proportional to the vibration velocity. The vibration characteristic parameters of the tie rod are obtained by the controller through decoding and processing, thus realizing the measurement target.

[0046] Furthermore, the laser signal reflected back by the circumferential tie rod 9 is processed and analyzed sequentially by the speed recorder 13, the digital signal processor 14, the filter 15, and the signal converter 16.

[0047] Furthermore, based on the changes in the vibration characteristic parameters of the tie rod, identifying preload-detuned tie rods specifically includes: calculating the tie rod frequency under different preload states based on the tie rod preload beam model and theoretical formulas; and comparing the changes in the vibration characteristic parameters of the tie rod based on the calculated mapping relationship between the preload and the tie rod frequency to determine whether the tie rod is detuned.

[0048] This invention proposes a theoretical model for predicting the natural frequency of a tie rod, with an error of no more than 2% compared to the finite element method. Furthermore, based on modal sensitivity analysis, a quantitative index for the preload state of the tie rod is proposed. A circumferentially distributed tie rod rotor finite element model is established, meshed, and the tie rod frequency under different preload states is calculated. In the experiment, a laser vibration test bench for preload detuning of the end-face toothed tie rod rotor 1 is built, and the tie rod frequency is measured. The theoretical analysis and finite element simulation results are compared to establish the mapping relationship between preload and tie rod frequency. The experimental results are used to determine whether the tie rod is detuned. If a tie rod that does not meet the assembly accuracy requirements is identified during the inspection process, it needs to be disassembled and reassembled until the preload state is satisfactory.

[0049] This invention also provides a non-contact identification device for preload mistuning of an end-face geared rod rotor, to realize the non-contact identification method for preload mistuning of an end-face geared rod rotor described in this invention, such as... Figure 1 As shown, it includes the main body of the experimental equipment and the data analysis module;

[0050] The data acquisition and analysis module includes a laser vibrometer 12, and the output of the laser vibrometer 12 is sequentially connected to a velocity recorder 13, a digital signal processor 14, a filter 15, and a signal converter 16.

[0051] like Figure 2 As shown, the main body of the experimental device includes an end-face toothed disc pull rod rotor. The end-face toothed disc pull rod rotor includes a rotor left wheel 3, a rotor first-stage wheel 4, a rotor second-stage wheel 5, a rotor third-stage wheel 6, a rotor fourth-stage wheel 7, a rotor right wheel 8, and a shaft head 10 connected in sequence. Each wheel of the end-face toothed disc pull rod rotor (i.e., rotor left wheel 3, rotor first-stage wheel 4, rotor second-stage wheel 5, rotor third-stage wheel 6, rotor fourth-stage wheel 7, and rotor right wheel 8) has pull rod holes evenly arranged along the circumferential direction of the wheel near the wheel rim. Each wheel is connected by a circumferential pull rod 9 passing through the pull rod holes.

[0052] In the identification device of the present invention, the end face toothed disc pull rod rotor 1 is pre-tightened by a circumferential pull rod 9.

[0053] Furthermore, such as Figure 3As shown, there is a gap 17 at the meshing point of the end face teeth of each level of the wheel.

[0054] Furthermore, one end of the circumferential tie rod 9 is locked with the tie rod nut 2, forming a flexible discontinuous system.

[0055] The end-face toothed disc tie rod rotor preload mistuning non-contact identification device described in this invention is simple, such as... Figure 1 As shown, during the measurement, the circumferentially distributed tie rod rotor is struck with a force hammer 11. The vibration frequency of the circumferential tie rod 9 is measured through the data acquisition and analysis module. The frequency of each circumferential tie rod 9 is measured in sequence using this method. The different preload of the tie rod will cause significant changes in the tie rod frequency. By comparing the frequency differences of the circumferential tie rod 9, the preload mistunted tie rod is identified.

[0056] like Figure 4 As shown, the identification method of the present invention includes three parts: modal experiment, theoretical analysis and finite element simulation.

[0057] The finite element simulation process involves first establishing a circumferentially distributed tie rod rotor model, then performing finite element mesh generation, and finally conducting finite element analysis on tie rod detuning. The tie rod frequencies are calculated for the following three cases to obtain the influence of tie rod preload on the frequency, f1.

[0058] Specifically, the three cases include: (a) the modal frequency of the tie rod with uniform preload, (b) the modal frequency of the tie rod after the preload of one tie rod is completely released, and (c) the modal frequency of the tie rod after the preload of all tie rods is randomly released by 10%-20% using the Monte Carlo method.

[0059] The theoretical analysis process involves simplifying the circumferential tie rod 9 of the end face toothed rotor 1, establishing a tie rod preload beam model, and calculating the tie rod frequency f2 under different preload F states based on theoretical formulas.

[0060] Specifically, based on the influence of the tie rod preload on the frequency f1 and the tie rod frequency f2 under different preload forces F, first-order and second-order modal sensitivity analyses are performed. Then, it is determined whether |f1-f2|<ε to obtain the mapping relationship between the preload force F and the tie rod frequency f.

[0061] The experimental procedure involves setting up a laser vibration testing platform for preload detuning of the end-face geared rod rotor, measuring the rod frequency f3, and determining whether the rod is detuned based on the mapping relationship between preload and rod frequency obtained from theoretical analysis and finite element simulation, combined with the rate of change of f3. If detuned, the end-face geared rod rotor 1 is disassembled and reassembled; if not detuned, the identification process ends and the assembly is considered successful.

[0062] The following provides an embodiment of the identification method described in this invention for judgment and identification, such as... Figure 5 As shown, it can be seen that Figure 5(a) The tie rod in a uniformly preloaded state reaches the first mode at a frequency of 576 Hz. Figure 5 (b) The tie rod in a uniformly preloaded state reaches the second-order mode at a frequency of 1311 Hz. Figure 5 (c) When one preload is completely released, the tie rod reaches the first mode at 356 Hz, while the other uniformly preloaded tie rods reach the first mode at 575 Hz. Figure 5 (d) The rod with a preload completely released reaches the second mode at 977.76 Hz, while the other rods with uniform preload reach the second mode at 1310.2 Hz.

[0063] Simulation calculations show that releasing the preload of the tie rod significantly reduces its frequency. In experiments, the tie rod frequency can be measured using a non-contact laser vibration meter, and changes in the tie rod frequency can be used to identify tie rods with mistuned preload.

[0064] The circumferential tie rod 9 of the end-face geared rotor 1 can be simplified as a simply supported beam, such as Figure 6 As shown, the formula for calculating the modal frequencies of a simply supported beam is:

[0065]

[0066] In the formula, f i Let be the modal frequency of the simply supported beam, i be the i-th mode shape, L be the beam length, E be the elastic modulus, I be the moment of inertia of the cross section, and m be the mass of the beam.

[0067] With the addition of axial force, the formula for calculating the modal frequencies of a simply supported beam is:

[0068]

[0069] In the formula, F is the tensile force on the simply supported beam, ρ is the material density of the simply supported beam, and A is the cross-sectional area of ​​the simply supported beam.

[0070] Calculations show that the first-order frequency of the tie rod is 574.3 Hz, with a simulation error of 0.3%, and the second-order frequency of the tie rod is 1296.0 Hz, with a simulation error of 1.1%, demonstrating the rationality of the simply supported beam model.

[0071] In this embodiment, modal sensitivity analysis of the preloaded state of the tie rod is also proposed, as follows:

[0072]

[0073] The above formula is the judgment formula for model sensitivity. Substituting the model data into the above formula, it can be determined that the first-order mode sensitivity of the model is greater than that of the second-order mode.

[0074] like Figure 7As shown, the preload of all 12 tie rods of the rotor is randomly released by 10%-20%, and the first-order modal frequency of each tie rod is calculated. Figure 7 As shown in (a), it can be seen that the first-order modal frequency of the uniformly preloaded tie rod is 576 Hz, while the frequency of the tie rod with the preload released is at most 549.08 Hz and at least 534.67 Hz. Figure 7 (b) shows that the second-order modal frequency of the uniformly preloaded tie rod is 1311.0 Hz. The highest frequency of the tie rod after the preload is released is 1274.7 Hz, and the lowest is 1248.0 Hz. It can be seen that the errors of theoretical analysis and simulation calculation are both below 2%.

[0075] like Figure 8 As shown, the first-order natural frequency is more affected by the preload state than the second-order frequency. Therefore, the first-order modal frequency of the circumferential tie rod 9 can be used to determine whether the tie rod is detuned due to preload. When the modal frequency of the circumferential tie rod 9 decreases by more than 10%, the preload state is poor, and a significant detuning phenomenon occurs. At this time, the uniformity test of the preload state fails, and the assembly accuracy requirements are not met, requiring disassembly and reassembly. When the modal frequency of the circumferential tie rod 9 decreases by less than 10%, the preload state is good, and no obvious detuning phenomenon occurs. At this time, the uniformity test of the preload state passes, and the assembly accuracy requirements are met.

[0076] As embodiments of the present invention, it will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention, which are also within the scope of protection of the present invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the foregoing description; thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0077] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A non-contact method for identifying preload mistuning of an end-face toothed disc tie rod rotor, characterized in that, Includes the following steps: Laser light is used to irradiate the rod of the end face toothed rotor (1) and the laser signal reflected back by the rod is collected. The laser signal is processed to obtain the vibration characteristic parameters of the pull rod; Based on changes in the vibration characteristic parameters of the tie rod, preload mistuning tie rods are identified, specifically including: Based on a pre-established tie-rod preload beam model, different preload forces are calculated according to theoretical formulas. F Pulling frequency in the state Based on the influence of tie rod preload on frequency Different preloads F Pulling frequency in the state Perform first-order and second-order modal sensitivity analysis, and then determine | Whether or not preload is obtained F and lever frequency f The mapping relationship; A laser vibration test bench was built to measure the preload detuning of the end-face geared rod rotor, and the frequency of the rod was measured. Based on the mapping relationship between preload and rod frequency obtained from theoretical analysis and finite element simulation, combined with... The rate of change is used to determine whether the tie rod is out of tune. If it is out of tune, the end face gear plate tie rod rotor is disassembled and reassembled. If it is not out of tune, the identification ends and the assembly is qualified. The calculation of different preload forces F Pulling frequency in the state This includes the following situations: (a) The modal frequency of the tie rod with uniform preload; (b) The modal frequency of the tie rod after the preload of one tie rod is completely released; (c) Modal frequencies of the tie rods after the preload of all tie rods is randomly released by 10%-20% using the Monte Carlo method.

2. The non-contact identification method for preload mistuning of an end-face toothed disc tie rod rotor according to claim 1, characterized in that, The process of using laser light to irradiate the tie rod of the end face toothed rotor (1) and collecting the laser signal reflected back from the tie rod specifically includes: Based on the laser Doppler principle, the laser emitted by the laser vibrator (12) is irradiated on the pull rod of the end face toothed rotor (1), and the output signal of the laser and the reflected laser signal are collected simultaneously.

3. The non-contact identification method for preload mistuning of an end-face toothed disc tie rod rotor according to claim 1, characterized in that, The method of using laser to irradiate the tie rod of the end face toothed rotor (1) includes: passing the emitted laser through the meshing gap (17) of the end face teeth and hitting the circumferential tie rod (9) of the end face toothed rotor (1).

4. The non-contact identification method for preload mistuning of an end-face toothed disc tie rod rotor according to claim 3, characterized in that, The laser signal collected by the pull rod includes: using a hammer (11) to excite the end face toothed disc pull rod rotor (1), and collecting the laser signal reflected back by the circumferential pull rod (9) of the end face toothed disc pull rod rotor (1).

5. The non-contact identification method for preload mistuning of an end-face toothed disc tie rod rotor according to claim 1, characterized in that, The laser signal data processing includes: the laser signal is processed and analyzed by a speed recorder (13), a digital signal processor (14), a filter (15), and a signal converter (16).

6. A non-contact identification device for preload mistuning of an end-face geared rod rotor, to achieve the non-contact identification method for preload mistuning of an end-face geared rod rotor as described in any one of claims 1-5, characterized in that, Includes the main body of the experimental equipment and the data acquisition and analysis module; The main body of the experimental equipment includes an end face toothed disc pull rod rotor (1), which includes a rotor left wheel disc (3), a rotor first stage wheel disc (4), a rotor second stage wheel disc (5), a rotor third stage wheel disc (6), a rotor fourth stage wheel disc (7), a rotor right wheel disc (8), and a shaft head (10) connected in sequence. Each stage of the end face toothed disc pull rod rotor (1) has pull rod holes evenly arranged along the circumferential direction of the wheel disc near the wheel rim. Each stage of the wheel disc is connected by circumferential pull rods (9) passing through the pull rod holes. The data acquisition and analysis module includes a laser vibrometer (12), and the output of the laser vibrometer (12) is connected in sequence to a velocity recorder (13), a digital signal processor (14), a filter (15), and a signal converter (16).

7. The non-contact identification device for preload mistuning of an end-face toothed disc pull rod rotor according to claim 6, characterized in that, There are gaps at the meshing points of the end faces of the various wheel discs (17).

8. The non-contact identification device for pre-tightening mistuning of an end-face toothed disc pull rod rotor according to claim 6, characterized in that, One end of the circumferential tie rod (9) is locked with a tie rod nut (2) to form a flexible discontinuous system.

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