CN116067594A - A coupling torsional stiffness and damping test device and method thereof - Google Patents

Abstract

The invention relates to a coupling torsional stiffness and damping testing device and a method thereof. The method comprises: installing the coupling to be tested on a horizontal bench or a vertical bench; applying transient excitation to the coupling, and measuring Obtain tangential vibration acceleration or angular velocity data, and the transient excitation is specifically tangential excitation or torsion angle excitation; for different transient excitations, use corresponding data processing methods to extract the natural frequency of the coupling torsional direction and calculate Damping ratio; then according to the natural frequency in the torsional direction, combined with the preset dynamic model of the coupling to be tested, the torsional stiffness of the coupling to be tested is calculated. Compared with the prior art, the present invention uses a dynamic method to test the torsional stiffness and damping of the coupling, without continuous static torque loading, accurate measurement of torque and torsion angle amplitude, and therefore no loading mechanisms such as hydraulic cylinders/motors And the torsion angle measuring mechanism of the shaft coupling has the advantages of low cost, high efficiency and wide application range.

Description

A coupling torsional stiffness and damping test device and method thereof

technical field

The invention relates to the technical field of coupling performance testing, in particular to a coupling torsional stiffness and damping testing device and method thereof.

Background technique

Coupling is an important part of mechanical transmission. In order to ensure its working reliability, it is often necessary to carry out corresponding performance tests on the coupling. The existing technology mainly uses hydraulic/motor actuators to test the coupling Static torque is applied to measure the static torsion angle of the coupling and calculate the torsional stiffness of the coupling.

For example, Chinese patent CN107345882B discloses a device for testing the torsional performance of a coupling and its testing method. Its hydraulic drive assembly drives the first torsional rotation of the component to be tested to measure the torsional performance of the first torsional component to be tested. For testing, the device has the advantages of being able to perform high-torque, small-angle torsion performance tests and also has the advantages of high test accuracy.

Chinese patent CN115096585A discloses a three-way loading test device for a coupling and a method for measuring the torsion angle of the coupling. The technical solution is to install a torsional loading assembly for torsional loading on the coupling on the test platform, and to axially load the coupling. The axial loading assembly and the radial loading assembly for radial loading of the coupling, the coupling is installed horizontally on the test platform, the front end is connected coaxially with the torsional loading assembly, and the rear end is connected with the axial loading assembly and radial loading assembly Connected separately, the coupling is twisted with the rotation of the torsion loading assembly, the front end of the coupling is equipped with a front measuring swing arm for measuring the torsion angle of the front end of the coupling, the rear end is equipped with a measuring coupling, and the rear end of the swing angle is measured The swing arm, the front measuring swing arm and the rear measuring swing arm all protrude radially and swing synchronously with the torsion of the coupling. To make the test loading condition of the coupling closer to the actual loading condition, thereby improving the accuracy of the calculation of the torsional stiffness of the coupling and improving the reliability of the test.

In addition, Chinese patents CN106052983A and CN101726377A disclose a simple and convenient test device and method for dynamic and static torsional stiffness of elastic couplings, a wind turbine coupling test bench and testing methods, and Korean patent KR1020220107391A discloses a torsional stiffness measuring device.

The above existing technologies all test the torsional static stiffness of the coupling by loading the static torque on the actuator and measuring the static torsion angle. This method needs to ensure continuous static torque loading, accurate torque and torsion angle amplitude measurement, and It is necessary to set up loading mechanisms such as hydraulic cylinders/motors/... and measuring devices for the torsion angle of the coupling, resulting in increased test costs and a longer test cycle, and due to the need to consider the torque range requirements for the coupling test, when testing the coupling When changing, the loading mechanism cannot adjust its loading capacity suitably.

Contents of the invention

The purpose of the present invention is to provide a coupling torsional stiffness and damping test device and method thereof in order to overcome the above-mentioned defects in the prior art, and to test the torsional stiffness and damping of the coupling through a dynamic method without continuous static Torque loading, accurate torque and torsion angle amplitude measurement, no loading mechanism such as hydraulic cylinder/motor, and no measuring device for coupling torsion angle, can test torsional stiffness and damping of coupling at low cost and efficiently.

The object of the present invention can be achieved through the following technical solutions: a coupling torsional stiffness and damping test device, including a horizontal bench for horizontally fixed installation of the coupling or a vertical bench for vertically fixed installation of the coupling Straight bench, the test device also includes an excitation source for applying transient excitation to the coupling, and the outer edge of the brake disc of the coupling is equipped with a vibration acceleration sensor for measuring the tangential vibration acceleration of the coupling , or a speed measuring encoder for measuring the angular velocity of the shaft coupling is installed on the bench, and the vibration acceleration sensor or speed measuring encoder is connected to the processing unit, and the processing unit is used to extract the natural frequency of the coupling torsional direction and the damping ratio , and calculate the torsional stiffness of the coupling.

Further, when the coupling is installed vertically, the dummy shaft on the generator side of the coupling is fixed on the ground, and the dummy shaft on the wind wheel side of the coupling is connected to the fixed tooling of the vertical stand. connected, the distance between the fixed tooling and the ground can be adjusted.

Further, the dummy shaft on the side of the wind rotor is connected with the fixed tooling of the vertical stand through angular contact ball bearings.

Further, the speed measuring encoder is installed on the fixed tooling of the vertical stand.

Further, when the coupling is installed horizontally, the dummy shaft on the generator side of the coupling is fixed to the first fixing tool of the horizontal platform, and the dummy shaft on the wind wheel side of the coupling is connected to the horizontal The distance between the first fixed tool and the second fixed tool can be adjusted, and the distance between the first fixed tool, the second fixed tool and the ground can be adjusted.

Further, the dummy shaft on the side of the wind rotor is connected with the second fixing tool of the horizontal platform through an angular contact ball bearing.

Further, the speed measuring encoder is installed on the second fixed tooling of the horizontal platform.

Further, the excitation source is specifically a tangential excitation source or a torsion angle excitation source, and the tangential excitation source specifically applies tangential excitation to the coupling through a force hammer, a rubber hammer or a nylon hammer;

The torsion angle excitation source specifically applies torque to the dummy shaft on the wind wheel side of the coupling through a torque wrench.

Further, when the excitation source is a torsion angle excitation source, a test tool for convenient torque application is installed at the position of the dummy shaft on the wind wheel side of the coupling, and the test tool is made of a brittle material, and the brittle material includes But not limited to cast iron and quenched high-carbon steel, the upper part of the test tool is provided with an adapter section for engaging and connecting the torque wrench, and the middle part of the test tool is provided with a necking section, and the torque is applied by the torque wrench to make the test tool Failure fracture within a preset torque range, thereby applying torsional angle excitation to the coupling.

Further, the speed measuring encoder is specifically a laser encoder or a magnetoelectric encoder.

A coupling torsional stiffness and damping test method, comprising the following steps:

S1. Install the shaft coupling to be tested on a horizontal bench or a vertical bench, wherein a vibration acceleration sensor is installed on the outer edge of the brake disc of the shaft coupling, or a speed encoder is installed on the bench;

S2. Apply transient excitation to the coupling, measure the corresponding tangential vibration acceleration or angular velocity data, and transmit it to the processing unit for data analysis, wherein the transient excitation is specifically tangential excitation or torsion angle excitation;

S3. If the transient excitation is a tangential excitation applied by a hammer, the processing unit uses H1/H2/Hv to estimate and calculate the frequency response function from the excitation point to the measurement point, and extract the natural frequency of the torsional direction based on the frequency response function, and based on the half Calculation of damping ratio by power method;

If the transient excitation is the torsion angle excitation applied by the torque wrench, the processing unit identifies the natural frequency of the torsional direction based on the phase for the time domain signal, and calculates the damping ratio based on the free decay method;

If the transient excitation is a tangential excitation applied by a rubber hammer or a nylon hammer, the processing unit calculates the mutual coherence function between each response measuring point, identifies the natural frequency of the torsional direction based on the phase, and calculates the damping ratio based on the half-power method;

S4. According to the natural frequency in the torsional direction, combined with the preset dynamic model of the coupling to be tested, the torsional stiffness of the coupling to be tested is calculated, specifically:

K _α =(2*π*f ₀ ) ² *J ₁

Among them, K _α is the torsional stiffness of the coupling, f ₀ is the natural frequency in the torsional direction of the coupling, J ₁ is the moment of inertia of the wind wheel side of the coupling including the brake disc, the moment of inertia of the intermediate body, the moment of inertia of the diaphragm and the upper part The sum of the moments of inertia of the false axes.

Compared with the prior art, the present invention has the following advantages:

1. The present invention adopts a dynamic method, by setting a horizontal stand or a vertical stand, to carry out horizontal fixed installation or vertical fixed installation of the coupling, and to set an excitation source to apply transient excitation to the coupling , in addition, a vibration acceleration sensor for measuring the tangential vibration acceleration of the coupling is installed on the outer edge of the brake disc of the coupling, or a speed measuring encoder for measuring the angular velocity of the coupling is installed on the bench, and then through the processing unit Extract the torsional natural frequency and damping ratio of the coupling, and calculate the torsional stiffness of the coupling. Therefore, the entire test device does not need to design additional loading mechanism and torsion angle measurement mechanism, nor does it need to continuously perform static torque loading, accurate torque and torsion angle amplitude measurement, but only needs to apply transient excitation to the coupling and collect response data, which can not only Effectively reduce the test cost, but also reduce the test time and improve the test efficiency.

2. The present invention is aimed at the vertical stand, and is designed to be used to connect the fixed tooling of the wind wheel side dummy shaft of the coupling, and the distance between the fixed tool and the ground can be adjusted; for the horizontal stand, it is designed for The first fixed tool for connecting the dummy shaft on the generator side of the coupling, and the second fixed tool for connecting the dummy shaft on the wind rotor side of the coupling, the distance between the first fixed tool and the second fixed tool can be adjusted , The distance between the first fixed tooling, the second fixed tooling and the ground can be adjusted. Therefore, there is no need to consider the torque range requirements of the coupling test, fully consider the axial and radial size adjustment range, and realize an adjustable and expandable structural design, which can be well applied to couplings of different types, sizes, and rated torques test.

3. The excitation source designed in the present invention is a tangential excitation source or a torsion angle excitation source, wherein, the tangential excitation source can apply tangential excitation to the coupling through a force hammer, rubber hammer or nylon hammer; the torsion angle excitation source can be used through a torque wrench And the designed test fixture applies torque to the dummy shaft on the wind wheel side of the coupling, the test fixture of the test fixture is made of brittle materials, the brittle materials include but not limited to cast iron, quenched high carbon steel, the test fixture of The upper part is provided with an adapter section for snapping and connecting the torque wrench, and the middle part of the test tool is provided with a necking section, and the torque is applied through the torque wrench, so that the test tool fails and breaks within the preset torque range, thereby ensuring convenient and reliable Apply a corresponding transient excitation to the coupling.

4. The present invention tests the torsional stiffness and damping of the coupling through a dynamic method, applies a transient excitation in the torsional direction to the coupling and collects response data, and obtains the coupling by using a modal identification method based on frequency domain and time domain The natural frequency and damping ratio of the torsional direction, and then calculate its torsional stiffness and damping through the dynamic model of the coupling. It not only ensures the accuracy of the test results, but also can measure the torsional stiffness and damping ratio of the coupling at the same time, which improves the test range and facilitates the subsequent simulation and analysis of the dynamic characteristics of the transmission chain.

Description of drawings

Figure 1a is a schematic diagram of the vertical installation effect of the shaft coupling in the present invention;

Fig. 1b is a schematic diagram of the horizontal installation effect of the shaft coupling in the present invention;

Figure 2a is a schematic diagram of the installation position of the vibration acceleration sensor when the shaft coupling is installed vertically;

Figure 2b is a schematic diagram of the installation position of the speed measuring encoder when the shaft coupling is installed vertically;

Fig. 3 is a schematic diagram of the effect of applying tangential excitation;

Fig. 4 is a schematic diagram of the application effect of torsion angle excitation;

Figure 5a is a schematic diagram of a test fixture when a torsion angle excitation is applied;

Figure 5b is a schematic diagram of another test fixture when the torsion angle excitation is applied;

Fig. 6 is a schematic flow chart of the method of the present invention;

Figure 7a is a schematic diagram of the natural frequency and damping ratio in the torsional direction of the coupling extracted after applying tangential excitation;

Figure 7b is a schematic diagram of the natural frequency and damping ratio in the torsional direction of the coupling extracted after applying torsional angle excitation;

Fig. 8 is a schematic diagram of the coupling dynamic model;

Notes in the figure: 1.1, dummy shaft on the wind wheel side, 1.2, angular contact ball bearing, 1.3, fixed tooling/second fixed tooling, 3, vibration acceleration sensor, 4, speed measuring encoder, 6.1/6.2, testing tooling.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figures 1a-1b, 2a-2b, a coupling torsional stiffness and damping test device includes a horizontal bench for horizontally fixed installation of the coupling or a vertical bench for vertically fixed installation of the coupling. Straight bench, the test device also includes an excitation source for applying transient excitation to the coupling, the outer edge of the brake disc of the coupling is installed with a vibration acceleration sensor 3 for measuring the tangential vibration acceleration of the coupling, or A speed measuring encoder 4 for measuring the angular velocity of the shaft coupling is installed on the bench (the speed measuring encoder 4 can be a laser encoder or a magnetoelectric encoder), the vibration acceleration sensor or the speed measuring encoder is connected to the processing unit, and the processing unit is used to extract The natural frequency of the torsional direction of the coupling and the damping ratio are calculated, and the torsional stiffness of the coupling is calculated.

As shown in Figure 1a, when the coupling is installed vertically, the dummy shaft on the generator side of the coupling is fixed on the ground, and the dummy shaft 1.1 on the wind wheel side of the coupling is connected to the vertical platform through the angular contact ball bearing 1.2. The fixed tooling 1.3 of the frame is connected to each other, and the torsion direction is kept free. The installation of the coupling should ensure that it meets the requirements of the compensation range of the coupling. The distance between the fixed tooling 1.3 and the ground can be adjusted, so as to adapt to coupling tests of different models, sizes and rated torques. Correspondingly, as shown in Fig. 2b, the speed measuring encoder 4 is installed on the fixed tooling 1.3 of the vertical stand.

As shown in Figure 1b, when the coupling is installed horizontally, the dummy shaft on the generator side of the coupling is fixed on the first fixing tool of the horizontal platform, and the dummy shaft 1.1 on the wind wheel side of the coupling passes through the angular contact ball The bearing 1.2 is connected with the second fixed tooling 1.3 of the horizontal platform, and the torsion direction is kept free. Usually, it is required to be not less than 10 times the torsional stiffness of the coupling and not less than 10 times the moment of inertia of the coupling. It should be ensured that the compensation range requirements for the alignment of the coupling are met. The distance between the first fixed tool and the second fixed tool 1.3 can be adjusted, and the distance between the first fixed tool and the second fixed tool 1.3 and the ground can be adjusted, so as to adapt to coupling tests of different models, sizes and rated torques . Correspondingly, the speed measuring encoder 4 is installed on the second fixing tool 1.3 of the horizontal platform.

In the actual test, the excitation source can be a tangential excitation source or a torsion angle excitation source. The tangential excitation source specifically applies a tangential excitation to the coupling through a force hammer, a rubber hammer or a nylon hammer (as shown in Figure 3); The angular excitation source is specifically to apply torque to the dummy shaft on the wind wheel side of the coupling through a torque wrench (as shown in Figure 4).

When the excitation source is the torsion angle excitation source, the position of the false shaft on the wind wheel side of the coupling is installed with the test fixture 6.1/6.2 (made of brittle materials such as cast iron, quenched high-carbon steel, etc.) for convenient torque application, as shown in Figure 5a As shown in and 5b, the upper part of the test tool is provided with an adapter section for snapping and connecting the torque wrench, and the middle part is provided with a necking section. Specifically, the installation test tool 6.1/6.2 is sleeved on the dummy shaft 1.1 on the wind wheel side of the coupling , and then apply torque through a torque wrench until the test fixture 6.1/6.2 breaks, and measure the tangential vibration acceleration or angular velocity data before and after the break.

Apply the above test device to realize a coupling torsional stiffness and damping test method, as shown in Figure 6, including the following steps:

S1. Install the shaft coupling to be tested on a horizontal bench or a vertical bench, wherein a vibration acceleration sensor is installed on the outer edge of the brake disc of the shaft coupling, or a speed encoder is installed on the bench;

S2. Apply transient excitation to the coupling, measure the corresponding tangential vibration acceleration or angular velocity data, and transmit it to the processing unit for data analysis, wherein the transient excitation is specifically tangential excitation or torsion angle excitation;

S3. If the transient excitation is a tangential excitation applied by a hammer, the processing unit uses H1/H2/Hv to estimate and calculate the frequency response function from the excitation point to the measurement point, and extract the natural frequency of the torsional direction based on the frequency response function, and based on the half The damping ratio is calculated by the power method (as shown in Figure 7a);

If the transient excitation is the torsion angle excitation applied by the torque wrench, the processing unit identifies the natural frequency of the torsional direction based on the phase for the time domain signal, and calculates the damping ratio based on the free decay method (as shown in Figure 7b);

If the transient excitation is a tangential excitation applied by a rubber hammer or a nylon hammer, the processing unit calculates the mutual coherence function between each response measurement point, identifies the natural frequency of the torsional direction based on the phase, and calculates the damping ratio based on the half-power method (as shown in Fig. 7a);

S4. According to the natural frequency of the torsional direction, combined with the preset dynamic model of the coupling to be tested (as shown in Figure 8), the torsional stiffness of the coupling to be tested is calculated, specifically:

K _α =(2*π*f ₀ ) ² *J ₁

Among them, K _α is the torsional stiffness of the coupling, f ₀ is the natural frequency in the torsional direction of the coupling, J ₁ is the moment of inertia of the wind wheel side of the coupling including the brake disc, the moment of inertia of the intermediate body, the moment of inertia of the diaphragm and the upper part The sum of the moments of inertia of the false axes.

This technical solution solves the static problem of stiffness measurement through a dynamic method, and its measurement principle is essentially different from that of the traditional solution. This technical solution does not require static torque loading and static torsion angle testing, so there is no need to consider the design of the loading mechanism and coupling torsion angle measurement mechanism in the bench, and the coupling can be installed with one end fixed and the other free. This technical solution does not need to measure the static torsion angle, but only needs to obtain the natural frequency of the torsion direction. Therefore, the selection and installation of the sensor are different from the traditional method, and it is only necessary to ensure that the frequency and time domain responses of the torsion direction can be obtained. This technical solution uses the transient excitation method instead of the static torque to load the coupling, and uses the modal frequency and damping identification method based on the time domain and frequency domain to extract the natural frequency and damping ratio of the coupling torsional direction. The determination of is mainly based on the phase information. The technical solution identifies and establishes a dynamic model of the coupling, and based on the model deduces the relationship between the torsional stiffness and the torsional natural frequency of the coupling obtained from the test, and then calculates and obtains the torsional stiffness of the coupling.

In practical application, the bench of this technical solution can adopt two installation design methods of horizontal A and vertical B, and three methods of hammer excitation C, torsion angle excitation D, and rubber hammer/nylon hammer excitation E can be used for testing. In addition, the measurement sensor can use vibration acceleration sensor F, laser encoder G or magnetoelectric encoder H, so that the corresponding coupling performance measurement can be carried out through any combination of the following:

1. A+C+F;

2. A+C+G;

3. A+C+H;

4. A+D+F;

5. A+D+G;

6. A+D+H;

7. A+E+F;

8. A+E+G;

9. A+E+H;

10. B+C+F;

11. B+C+G;

12. B+C+H;

13. B+D+F;

14. B+D+G;

15. B+D+H;

16. B+E+F;

17. B+E+G;

18. B+E+H.

In summary, the test accuracy of this technical solution is high: after testing and verification of various couplings, the difference between the design torsional stiffness and test results of couplings from leading suppliers such as KTR and Regal is within 3%;

Short test period: Since there is no need for accurate loading torque and torsion angle amplitude, only the natural frequency value needs to be obtained, so the bench does not need to install and debug the loading mechanism, test system time, and the test time is shorter than the static torque loading time. According to the data statistics, the installation, testing, post-processing and dismantling of the bench require a total of about 10 hours of manpower for a single unit, and the test period of a single unit for the same test of KTR is 2.5 months;

Strong applicability of the bench: the bench does not need to consider the torque range requirements of the coupling test, and the loading mechanism does not need to increase the loading capacity according to the increase of the test coupling; the axial and radial dimension adjustment range has been considered in the design of the bench, and the Adjustable and expandable structure design, suitable for coupling tests of different models, sizes and rated torques;

No need for mechanical/electrical loading power source: Unlike traditional solutions, this technical solution does not require torque loading, hydraulic cylinders/motors/... and other loading mechanisms, so there is no long-term testing cost;

Low test cost: the bench itself has low requirements, no loading mechanism, no high-precision torsion angle measurement, and fast installation and debugging, so the cost is much lower than traditional benches and test solutions;

Wide range of testing: In addition to torsional stiffness, it can also measure and obtain the damping ratio of the coupling, which can be used for the subsequent simulation and analysis of the dynamic characteristics of the transmission chain.

Claims (10)

1. A shaft coupling torsional stiffness and damping test device, characterized in that it comprises a horizontal stand for horizontally fixed installation of a shaft coupling or a vertical stand for vertically fixed installation of a shaft coupling, so The test device also includes an excitation source for applying transient excitation to the coupling, and the outer edge of the brake disc of the coupling is equipped with a vibration acceleration sensor for measuring the tangential vibration acceleration of the coupling, or on the bench A speed measuring encoder for measuring the angular velocity of the coupling is installed, the vibration acceleration sensor or speed measuring encoder is connected to a processing unit, and the processing unit is used to extract the natural frequency of the coupling torsional direction and the damping ratio, and calculate the coupling torsional stiffness. 2. A coupling torsional stiffness and damping test device according to claim 1, characterized in that, when the coupling is installed vertically, the dummy shaft on the generator side of the coupling is fixed on On the ground, the dummy shaft on the wind wheel side of the coupling is connected to the fixed tooling of the vertical stand, and the distance between the fixed tooling and the ground can be adjusted. 3 . The coupling torsional stiffness and damping test device according to claim 2 , wherein the dummy shaft on the side of the wind wheel is connected to the fixed tooling of the vertical stand through angular contact ball bearings. 4 . 4. A coupling torsional stiffness and damping test device according to claim 2 or 3, characterized in that the speed measuring encoder is installed on a fixed tool of a vertical stand. 5. A coupling torsional stiffness and damping test device according to claim 1, characterized in that, when the coupling is installed horizontally, the dummy shaft on the generator side of the coupling is fixed at the horizontal The first fixed tool of the horizontal platform, the dummy shaft of the wind wheel side of the coupling is connected with the second fixed tool of the horizontal platform, and the distance between the first fixed tool and the second fixed tool can be adjusted , the distance between the first fixed tool, the second fixed tool and the ground can be adjusted. 6 . The coupling torsional stiffness and damping test device according to claim 1 , wherein the dummy shaft on the side of the wind wheel is connected to the second fixed tooling of the horizontal stand through an angular contact ball bearing. 7 . 7. A coupling torsional stiffness and damping testing device according to claim 5 or 6, characterized in that the speed measuring encoder is installed on the second fixed tooling of the horizontal bench. 8. A coupling torsional stiffness and damping test device according to claim 1, characterized in that, the excitation source is specifically a tangential excitation source or a torsion angle excitation source, and the tangential excitation source is specifically through Apply tangential excitation to the coupling with force hammer, rubber hammer or nylon hammer; The torsion angle excitation source specifically applies torque to the dummy shaft on the wind wheel side of the coupling through a torque wrench. 9. A coupling torsional stiffness and damping test device according to claim 8, characterized in that, when the excitation source is a torsion angle excitation source, the position of the false axis on the wind wheel side of the coupling is installed for A test tool that is convenient for applying torque. The test tool is made of brittle materials, including but not limited to cast iron and quenched high-carbon steel. The upper part of the test tool is provided with an adapter section for snapping and connecting with a torque wrench , the middle part of the test tool is provided with a constricted section, and a torque is applied through a torque wrench, so that the test tool fails and breaks within a preset torque range, thereby applying a torsion angle excitation to the coupling. 10. A coupling torsional stiffness and damping test method, characterized in that, comprising the following steps: S1. Install the shaft coupling to be tested on a horizontal bench or a vertical bench, wherein a vibration acceleration sensor is installed on the outer edge of the brake disc of the shaft coupling, or a speed encoder is installed on the bench; S2. Apply transient excitation to the coupling, measure the corresponding tangential vibration acceleration or angular velocity data, and transmit it to the processing unit for data analysis, wherein the transient excitation is specifically tangential excitation or torsion angle excitation; S3. If the transient excitation is a tangential excitation applied by a hammer, the processing unit uses H1/H2/Hv to estimate and calculate the frequency response function from the excitation point to the measurement point, and extract the natural frequency of the torsional direction based on the frequency response function, and based on the half Calculation of damping ratio by power method; If the transient excitation is the torsion angle excitation applied by the torque wrench, the processing unit identifies the natural frequency of the torsional direction based on the phase for the time domain signal, and calculates the damping ratio based on the free decay method; If the transient excitation is a tangential excitation applied by a rubber hammer or a nylon hammer, the processing unit calculates the mutual coherence function between each response measuring point, identifies the natural frequency of the torsional direction based on the phase, and calculates the damping ratio based on the half-power method; S4. According to the natural frequency in the torsional direction, combined with the preset dynamic model of the coupling to be tested, the torsional stiffness of the coupling to be tested is calculated, specifically: K _α =(2*π*f ₀ ) ² *J ₁ Among them, K _α is the torsional stiffness of the coupling, f ₀ is the natural frequency in the torsional direction of the coupling, J ₁ is the moment of inertia of the wind wheel side of the coupling including the brake disc, the moment of inertia of the intermediate body, the moment of inertia of the diaphragm and the upper part The sum of the moments of inertia of the false axes.

Images