A high-frequency actuation torsional vibration measurement system and measurement method

Abstract

The present invention provides a high-frequency actuated torsional vibration measurement system, which uses an exciter to drive the gear under test to complete a high-frequency actuated rotation to simulate high-frequency torsional vibration. The torsional vibration measurement system measures and calculates the simulated torsional vibration to achieve accurate measurement of the torsional vibration amplitude of the gear under test. The present invention provides a new idea for a torsional vibration measurement system and method for the two situations where high-frequency torsional vibration is difficult to simulate under high-speed rotation of the motor and a vibration-actuated torsional vibration measurement method is missing. The present invention has the characteristics of simple measurement device, accurate simulation, and easy implementation.

Description

Technical Field

[0001] The present invention relates to the technical field of torsional vibration measurement, and in particular to a high-frequency actuation torsional vibration measurement system and a measurement method. Background Art

[0002] Torsional vibration is caused by the fact that the shaft system is not an absolute rigid body but has elasticity. Therefore, during the average speed rotation process, the elastic components will produce instantaneous speed fluctuations due to various reasons, forming a back-and-forth twisting along the rotation direction. Torsion will cause tangential alternating torsional stress inside the material, which will cause damage to the shaft system as time accumulates, and eventually lead to shaft system fracture, affecting the safe operation of the equipment. Therefore, it is very important to measure the torsional vibration amplitude of the shaft system.

[0003] The measurement requires simulation of the torsional vibration of the shaft system under working conditions. The current method of simulating torsional vibration by changing the motor speed has extremely high requirements on the motor, and it is impossible to simulate high-frequency torsional vibration under high-speed rotation. At present, there is a lack of accurate measurement systems and methods for high-frequency torsional vibration.

[0004] Therefore, in response to the above problems, a new technical means is urgently needed. Summary of the invention

[0005] In view of this, the present invention provides a high-frequency actuated torsional vibration measurement system, which is simple in device and easy to operate, and the measurement method can accurately measure the amplitude of high-frequency torsional vibration, thereby avoiding damage to the shaft system caused by accumulation over time and maintaining safe operation of the equipment.

[0006] In one aspect, the present invention provides a high-frequency actuation torsional vibration measurement system, the measurement system comprising an exciter, a detection module and a display module;

[0007] The vibration exciter is used to apply vibration excitation to the gear shaft of the gear under test;

[0008] The detection module includes a power module, a displacement detection module, and an information processing module; the input end of the displacement detection module is connected to the power module, and the output end of the displacement detection module is connected to the input end of the information processing module; the output end of the information processing module is connected to the input end of the display module; the displacement detection module transmits the detected gear displacement information to the information processing module, and the information processing module processes the information and transmits the processed information to the display module;

[0009] The input end of the display module is connected to the output end of the information processing module and is used to display the information processed by the information processing module.

[0010] Another aspect of the present invention further provides a measurement method based on the above measurement system, comprising the following steps:

[0011] S1. Turn on the vibration exciter and apply vibration excitation to the gear shaft of the gear under test;

[0012] S2. Observe the output waveform displayed by the display module, analyze and obtain the period T of the gear under test rotating back and forth, the time t1 corresponding to the peak of the output information of the displacement detection module, and the time interval Δt1 between adjacent peaks;

[0013] S3. Calculate the frequency and speed of the torsion change of the gear under test according to the period. The calculation method is as follows:

[0014]

[0015]

[0016] S4. Calculate the angle between two adjacent gears of the gear being tested according to the rotation speed. The calculation method is as follows:

[0017] θ=A(sinωt1-sinω(t1+Δt1))

[0018] S5. Calculate the vibration amplitude of the gear under test according to the included angle, specifically:

[0019] According to the number of teeth Z of the complete gear of the same size when the gear being tested is designed, the pitch angle θ between adjacent teeth of the incomplete gear is calculated:

[0020]

[0021] According to S4, the vibration amplitude of the gear under test can be expressed as:

[0022]

[0023] S6. If the vibration amplitude A>ε, the gear under test is seriously damaged and should be dealt with in time; ε is the set amplitude threshold.

[0024] The present invention has the following beneficial effects:

[0025] The present invention provides a high-frequency actuation torsional vibration measurement system and a measurement method, which can accurately measure the amplitude of the torsional vibration of the shaft system, timely handle the damaged shaft system, avoid shaft system damage and fracture caused by accumulation over time, and ensure the safe operation of the equipment;

[0026] The practical exciter of the present invention simulates the torsional vibration of the shaft system under actual working conditions, and can overcome the disadvantage that the high-frequency torsional vibration cannot be simulated under high-speed rotation of the motor;

[0027] The measuring system provided by the present invention also has the advantages of simple device and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0029] Figure 1 It is a schematic diagram of the structure of a high-frequency actuation torsional vibration measurement system;

[0030] Figure 2 It is a schematic diagram of the relative position between the eddy current sensor and the gear during the back and forth rotation of the gear being measured;

[0031] Figure 3 Schematic diagram of the output signal and torsion angle change curve of the eddy current sensor;

[0032] Figure 1 In the figure, 1- gear to be tested, 2- gear shaft, 3- eddy current sensor, 4- exciter. DETAILED DESCRIPTION

[0033] The present invention is described clearly and completely below in conjunction with the accompanying drawings and embodiments.

[0034] like Figure 1 , On one hand, the present invention provides a high-frequency actuation torsional vibration measurement system, the measurement system comprising an exciter, a detection module and a display module;

[0035] The vibration exciter 4 is used to apply vibration excitation to the gear shaft 2 of the gear 1 under test;

[0036] The detection module includes a power module, a displacement detection module, and an information processing module; the input end of the displacement detection module is connected to the power module, and the output end of the displacement detection module is connected to the input end of the information processing module; the output end of the information processing module is connected to the input end of the display module; the displacement detection module transmits the detected gear displacement information to the information processing module, and the information processing module processes the information and transmits the processed information to the display module;

[0037] The input end of the display module is connected to the output end of the information processing module, and is used to display the information processed by the information processing module;

[0038] In this embodiment, the gear 1 to be tested is an incomplete gear, whose gear shaft 2 is connected to the exciter 4 and driven by the exciter 4. The incomplete gear 1 to be tested rotates back and forth along the axis with the gear shaft 2 in a high-frequency actuation manner. The installation method of the incomplete gear is as follows: Figure 1 As shown in , the vibrator is provided with a clamp structure, which is fixedly arranged on the gear shaft;

[0039] The displacement detection module is an eddy current sensor, and the display module is an oscilloscope; the detection end of the eddy current sensor is installed in front of the center of the incomplete gear, such as Figure 1 As shown in;

[0040] The maximum rotation range of the incomplete gear shall not cause the eddy current sensor probe to exceed the toothed area of ​​the incomplete gear during the rotation of the incomplete gear;

[0041] After the vibration exciter 4 works, the incomplete gear starts to rotate counterclockwise. Figure 2 , the position of the eddy current sensor probe relative to the tooth changes from position 1 to position 6. When the eddy current sensor probe reaches position 6, the torsion angle of the incomplete gear reaches the maximum; then the incomplete gear starts to move clockwise, and the position of the eddy current sensor probe relative to the tooth returns from position 6 to position 1, and continues from position 1 to position 6'. When it reaches position 6', the torsion angle of the incomplete gear reaches the reverse maximum value; then the incomplete gear rotates counterclockwise, and the position of the eddy current sensor probe relative to the tooth returns to position 1. At this point, a cycle of torsional vibration of the incomplete gear ends;

[0042] Another aspect of the present invention provides a measurement method based on the high-frequency actuation torsional vibration measurement system, the steps comprising:

[0043] S1. Turn on the vibration exciter and apply vibration excitation to the gear shaft of the gear under test;

[0044] S2. Observe the output waveform displayed by the display module, analyze and obtain the period T of the gear under test rotating back and forth, the time t1 corresponding to the peak of the output information of the displacement detection module, and the time interval Δt1 between adjacent peaks;

[0045] S3. Calculate the frequency and speed of the torsion change of the gear under test according to the period. The calculation method is as follows:

[0046]

[0047]

[0048] S4. Calculate the angle between two adjacent gears of the gear being tested according to the rotation speed. The calculation method is as follows:

[0049] θ=A(sinωt1-sinω(t1+Δt1))

[0050] S5. Calculate the vibration amplitude of the gear under test according to the included angle, specifically:

[0051] According to the number of teeth Z of the complete gear of the same size when the gear being tested is designed, the pitch angle θ between adjacent teeth of the incomplete gear is calculated:

[0052]

[0053] According to S4, the vibration amplitude of the gear under test can be expressed as:

[0054]

[0055] S6. If the vibration amplitude A>ε, the gear under test is seriously damaged and should be dealt with in time; ε is the set amplitude threshold, which is determined according to the actual working requirements of the gear under test.

[0056] In this embodiment, in step S1, when the gear of the incomplete gear passes through the eddy current sensor, the signal value detected by the eddy current sensor is the largest. Therefore, the relative position of the eddy current sensor probe corresponding to the voltage signal processed by the information processing module is as follows: Figure 3 , Figure 3 The numbers in Figure 2 Thus, the period of torsional vibration of the incomplete gear, the time t1 corresponding to one of the peaks of the output signal of the eddy current sensor, and the time interval Δt1 between adjacent peaks can be analyzed.

[0057] In this embodiment, the step S3, Figure 3 The torsion angle curve below indicates the deviation of the corresponding position of the eddy current sensor on the gear from the initial position during the back-and-forth rotation of the incomplete gear, that is, the torsion angle of the simulated shaft rotation, which is a sine curve and can be expressed by the following formula:

[0058]

[0059] Every time the incomplete gear passes through the eddy current sensor, the output voltage signal is a peak value. Therefore, the angle between two adjacent gears of the gear being tested can be expressed as:

[0060] θ=A(sinωt1-sinω(t1+Δt1))

[0061] In this embodiment, in step S6, if the gear being tested is seriously damaged, it should be replaced in time to avoid shaft breakage caused by accumulation over time, thereby ensuring the safe operation of the equipment.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A high frequency actuation torsional vibration measurement system, characterized in that: The measuring system comprises a vibration exciter, a detection module and a display module; The vibration exciter is used to apply vibration excitation to the gear shaft of the gear under test; The detection module includes a power module, a displacement detection module, and an information processing module; the input end of the displacement detection module is connected to the power module, and the output end of the displacement detection module is connected to the input end of the information processing module; the output end of the information processing module is connected to the input end of the display module; the displacement detection module transmits the detected gear displacement information to the information processing module, and the information processing module processes the information and transmits the processed information to the display module; The input end of the display module is connected to the output end of the information processing module, and is used to display the information processed by the information processing module; wherein: The gear under test is an incomplete gear, whose gear shaft is connected to the exciter and driven by the exciter. The gear under test rotates back and forth along the axis with the gear shaft in a high-frequency actuation manner. The displacement detection module is an eddy current sensor, and the display module is an oscilloscope; the detection end of the eddy current sensor is installed just in front of the center of the incomplete gear; The maximum rotation range of the incomplete gear shall not cause the eddy current sensor probe to exceed the toothed area of ​​the incomplete gear during the rotation of the incomplete gear; After the exciter works, the incomplete gear starts to rotate counterclockwise, and the position of the eddy current sensor probe relative to the tooth changes from position 1 to position 6. When the eddy current sensor probe reaches position 6, the torsion angle of the incomplete gear reaches the maximum; then the incomplete gear starts to move clockwise, and the position of the eddy current sensor probe relative to the tooth returns from position 6 to position 1, and continues from position 1 to position 6'. When it reaches position 6', the torsion angle of the incomplete gear reaches the reverse maximum value; then the incomplete gear rotates counterclockwise, and the position of the eddy current sensor probe relative to the tooth returns to position 1. At this point, a cycle of torsional vibration of the incomplete gear ends.

2. The measuring method of the measuring system according to claim 1, characterized in that: The following steps are involved: S1. Turn on the vibration exciter and apply vibration excitation to the gear shaft of the gear under test; S2. Observe the output waveform displayed by the display module, analyze and obtain the period T of the gear under test rotating back and forth, the time t1 corresponding to the peak of the output information of the displacement detection module, and the time interval Δt1 between adjacent peaks; S3. Calculate the frequency and speed of the torsion change of the gear under test according to the period. The calculation method is as follows: S4. Calculate the angle between two adjacent teeth of the gear under test according to the rotation speed. The calculation method is as follows: θ=A(sinωt1-sinω(t1+Δt1)) S5. Calculate the vibration amplitude of the gear under test according to the included angle, specifically: According to the number of teeth Z of the complete gear of the same size when the gear being tested is designed, the pitch angle θ between adjacent teeth of the incomplete gear is calculated: According to S4, the vibration amplitude of the gear under test can be expressed as: S6. If the vibration amplitude A>ε, the gear under test is seriously damaged and should be dealt with in time; ε is the set amplitude threshold.

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