A testing device for the vibration damping effect of a pipeline damper and a data processing method

Abstract

The present invention relates to the field of testing the vibration damping effect of pipeline dampers, and particularly to a device for testing the vibration damping effect of pipeline dampers, which includes an elastic rope, a high-frequency vibrator, a vibration rod, monitoring sensor A1, monitoring sensor A2, pipe clamp pieces, monitoring sensor B1, monitoring sensor B2, a loading bridge and a simulated load. The high-frequency vibrator is suspended above the sample to be tested by the elastic rope in an inverted manner. One end of the vibration rod is connected to the loading bridge, the loading bridge is connected to the simulated load, and the pipe clamp pieces are used to clamp the simulated load. The excitation force generated by the high-frequency vibrator is transmitted to the sample to be tested through the pipe clamp pieces. Monitoring sensor A1 and monitoring sensor A2 are installed on the pipe clamp pieces, and monitoring sensor B1 and monitoring sensor B2 are installed on the test bench. The present invention significantly improves the accuracy, reliability and practicability of testing the vibration damping effect of pipeline dampers.

Description

Technical Field

[0001] The present invention relates to the field of vibration reduction effect testing of pipeline dampers, and particularly to a device for testing the vibration reduction effect of pipeline dampers and a data processing method, which are applicable to vibration reduction effect experiments with high-frequency excitation at the top. Background Art

[0002] In the vibration reduction effect test of pipeline dampers, it has always been a difficult problem to apply stable high-frequency excitation to the top of the tested component. Since the load during the normal operation of the pipeline damper comes from the top (pressure pulses generated by pipeline fluid), while traditional vibration tables generally give a vibration input to the entire tested component from the bottom of the sample. Exciting the damper according to the conventional method will cause all components of the damper to be simultaneously subjected to equivalent vibration stresses, which does not conform to the actual working conditions (conventional dampers are used to effectively reduce noise and isolate ground vibrations from bottom to top). If conventional fatigue testing machines and electromagnetic exciters are used, it is also difficult to simultaneously meet the requirements of ultra-wideband loading and displacement for pipeline vibration reduction. In practical applications, it is found that when conducting tests with this equipment, trade-offs need to be made among various test indicators, and the experimental requirements cannot be met either. Summary of the Invention

[0003] The present invention discloses a device for testing the vibration reduction effect of pipeline dampers and a data processing method. Through wide-band vibration testing, flexible simulated load design, comprehensive data processing methods, and optimized experimental device structures, the accuracy, reliability, and practicality of testing the vibration reduction effect of pipeline dampers are significantly improved.

[0004] To achieve the purpose of the present invention, the technical solution adopted is: a device for testing the vibration reduction effect of pipeline dampers, including an elastic rope, a high-frequency exciter, an excitation rod, monitoring sensor A1, monitoring sensor A2, pipe clamp pieces, monitoring sensor B1, monitoring sensor B2, a loading bridge, and a simulated load. The high-frequency exciter is suspended above the tested sample in an inverted manner by the elastic rope. One end of the excitation rod is connected to the loading bridge, the loading bridge is connected to the simulated load, and the pipe clamp pieces are used to clamp the simulated load. The excitation force generated by the high-frequency exciter is transmitted to the tested sample through the pipe clamp pieces. Monitoring sensor A1 and monitoring sensor A2 are installed on the pipe clamp pieces, and monitoring sensor B1 and monitoring sensor B2 are installed on the test bench.

[0005] As an optimized solution of the present invention, the simulated load is designed in a dumbbell shape, and the simulated load is used to simulate the load weight and vibration conditions borne by the pipeline damper.

[0006] As an optimized solution of the present invention, detachable mass adjustment pieces are provided at both ends of the simulated load.

[0007] As an optimized solution of the present invention, the pipeline damper vibration reduction effect test device further includes a control sensor C, which is used to measure the vibration input energy at the excitation rod, and ensures consistent excitation input each time by measuring the excitation energy in three directions (X, Y, Z) each time.

[0008] As an optimized solution of the present invention, the monitoring sensors A1, A2, B1, and B2 are all acceleration sensors.

[0009] In order to achieve the object of the present invention, the technical solution adopted is: a data processing method for a pipeline damper vibration reduction effect test device, including the following steps:

[0010] 1) Average the acceleration data collected by the monitoring sensors A1 and A2 at the pipe clip and perform unit conversion;

[0011] 2) Calculate the effective value of the linear acceleration values at all frequency points to obtain the total acceleration value;

[0012] 3) Convert the total acceleration value to the total acceleration level at the pipe clip;

[0013] 4) Calculate the acceleration data collected by the monitoring sensors B1 and B2 at the base of the pipeline damper according to the above steps 1)-3) to obtain the total acceleration level at the base;

[0014] 5) Subtract the total acceleration level at the pipe clip from the total acceleration level at the base to obtain the vibration reduction effect value of the pipeline damper;

[0015] 6) Compare the vibration reduction effect value of the pipeline damper with the equipment requirement index to judge whether the vibration reduction effect meets the requirements.

[0016] As an optimized solution of the present invention, in step 1), the unit conversion is to convert the unit from gravitational acceleration to m / s 2 , and the formula is:

[0017]

[0018] where: a i represents the average acceleration value corresponding to the i-th frequency point at the pipe clip, and the unit is m / s 2 ; a A1 and a A2 respectively represent the acceleration values collected by the monitoring sensors A1 and A2, and the unit is g.

[0019] As an optimized solution of the present invention, in step 2), the formula for calculating the effective value of the acceleration values at all frequency points is:

[0020]

[0021] Where: a total is the root mean square (RMS) value of the linear acceleration values at all frequency points.

[0022] As an optimized solution of the present invention, in step 3), according to the conversion formula of acceleration level and acceleration magnitude:

[0023]

[0024] The total acceleration level formula at the pipe clamp piece is obtained by conversion as:

[0025] L total = 20×log 10 a total + 120

[0026] Where: a ref is the reference acceleration, which is 1×10 -6 m / s 2 , and it is the reference value in dB level; L total is the total acceleration level at the pipe clamp piece.

[0027] The present invention has positive effects: 1) The test device of the present invention can cover the vibration stress test requirements of a wide frequency band from low frequency to high frequency. It is not only applicable to the vibration reduction effect test, but also can be used for the durability experiment of dampers. This design can meet the requirements of high-frequency and large-displacement working conditions at the same time, expanding the application scope of the test device;

[0028] 2) The present invention can conduct an overall evaluation of the experimental results, rather than only focusing on the vibration reduction effect in a certain frequency band. By converting the acceleration data into acceleration levels and calculating the total acceleration level, the vibration reduction effect of the damper can be evaluated more comprehensively, improving the scientificity and accuracy of data analysis;

[0029] 3) The present invention suspends the high-frequency exciter by an elastic cord and transmits the excitation force to the sample to be tested through the pipe clamp piece, avoiding the limitations of the traditional vibration table excited from the bottom. This structural design is closer to the actual working conditions, can more realistically simulate the working state of the pipeline damper, and conducts tests in a way that is close to the original test state at a lower cost, improving the reliability of the test results. Description of the Drawings

[0030] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0031] Figure 1 is a schematic side half-sectional structure view of the test device of the present invention;

[0032] Figure 2 is a schematic front view structure view of the test device of the present invention;

[0033] Figure 3 This is a schematic diagram of the test data curve of the present invention.

[0034] Among them: 1. Elastic rope, 2. High-frequency vibrator, 3. Moving coil connecting plate, 4. Vibration rod, 5. Control sensor C, 6. Monitoring sensor A1, 7. Monitoring sensor A2, 8. Pipe clamp piece, 9. Specimen under test, 10. Monitoring sensor B1, 11. Monitoring sensor B2, 12. Loading bridge, 13. Simulated load, 14. Mass adjustment piece. Specific embodiments

[0035] The method of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] As Figure 1 shown, the present invention discloses a test device for the vibration reduction effect of a pipeline damper, including an elastic rope 1, a high-frequency vibrator 2, a vibration rod 4, a monitoring sensor A1 6, a monitoring sensor A2, a pipe clamp piece 8, a monitoring sensor B1, a monitoring sensor B2, a loading bridge 12 and a simulated load 13. The high-frequency vibrator 2 is suspended by the elastic rope 1 and inverted above the specimen under test 9. One end of the vibration rod 4 is connected to the loading bridge 12, and the loading bridge 12 is connected to the simulated load 13. The pipe clamp piece 8 is used to clamp the simulated load 13. The vibration force generated by the high-frequency vibrator 2 is transmitted to the specimen under test 9 through the pipe clamp piece 8. The monitoring sensor A1 and the monitoring sensor A2 are installed on the pipe clamp piece 8, and the monitoring sensor B1 and the monitoring sensor B2 are installed on the test table.

[0037] As Figure 2 shown, the test device for the vibration reduction effect of the pipeline damper further includes a control sensor C. The control sensor C is used to measure the vibration input energy at the vibration rod 4, and ensures that the excitation input is consistent each time by measuring the excitation energy in three directions (X, Y, Z) each time. The control sensor C ensures that the excitation energy of each test is the same, improves the reliability and repeatability of the test results. Through multi-dimensional measurement, the distribution of the vibration input energy is more comprehensively reflected, and the accuracy of the test is improved.

[0038] The monitoring sensor A1, the monitoring sensor A2, the monitoring sensor B1 and the monitoring sensor B2 are all acceleration sensors.

[0039] The simulated load 13 is designed in a dumbbell shape and is clamped by the pipe clamp piece 8. The simulated load 13 is used to simulate the load weight and vibration conditions borne by the pipeline damper.

[0040] By applying vibration excitation, the simulated load 13 can help evaluate the vibration reduction effect of the damper under different load conditions. To meet the requirements of different pipe dampers for different loads, detachable mass adjustment pieces 14 are provided at both ends of the simulated load 13. This increases the flexibility and practicality of the test. At the same time, in order to be as close to the actual situation as possible, the vibration excitation is selected to act on the simulated load 13 rather than directly on the pipe clamp piece 8. To achieve this purpose, there is a simple and efficient method, that is, using an elastic cord 1 to suspend the high-frequency vibrator 2, connecting both ends of the excitation rod 4 to the moving coil connection plate 3 and the loading bridge 12 respectively. The excitation force is transmitted to the test sample 9 through the pipe clamp piece 8. The energy finally transmitted to the bottom after being reduced by the vibration reduction of the sample is weakened. The vibration reduction effect is obtained by comparing the accelerations collected by the upper and lower sensors.

[0041] Figure 3 For a set of test data curves obtained from the test, taking the curves collected by the monitoring sensor A1 and the monitoring sensor A2 at the pipe clamp piece as an example, several points are taken according to the logarithmic relationship in the frequency range of 5 - 10000 Hz, and the test frequency domain curve is exported into an excel table to obtain the relationship between the horizontal coordinate frequency (Hz) - vertical coordinate magnitude (g). The data processing method of a test device for the vibration reduction effect of a pipe damper is used for processing, including the following steps:

[0042] 1) Average the acceleration data collected by the monitoring sensor A1 and the monitoring sensor A2 at the pipe clamp piece 8 and perform unit conversion;

[0043] In step 1), the unit conversion is to convert the unit from gravitational acceleration to m / s 2 , and the formula is:

[0044]

[0045] Where: a i represents the average acceleration value corresponding to the i-th frequency point at the pipe clamp piece, with the unit of m / s 2 ; a A1 and a A2 respectively represent the acceleration values collected by the monitoring sensor A1 and the monitoring sensor A2, with the unit of g.

[0046] 2) Calculate the effective value formula of the acceleration values at all frequency points;

[0047] In step 2), the formula for calculating the root mean square (RMS) of the acceleration values at all frequency points is:

[0048]

[0049] Where: a total is the root mean square (RMS) of the linear acceleration values at all frequency points.

[0050] 3) Convert the total acceleration value to the total acceleration level (dB) at the pipe clip piece;

[0051] In step 3), according to the conversion formula of the acceleration level and the acceleration magnitude:

[0052]

[0053] The converted formula for the total acceleration level at the pipe clip piece is:

[0054] L total = 20 × log 10 a total + 120

[0055] where: a ref is the reference acceleration, which is 1 × 10 -6 m / s 2 , and it is the reference value of the dB level; L total is the total acceleration level at the pipe clip piece;

[0056] 4) Calculate the acceleration data collected by the monitoring sensor B1 and the monitoring sensor B2 at the base of the pipeline damper according to the above steps 1)-3) to obtain the total acceleration level at the base;

[0057] 5) Subtract the total acceleration level at the pipe clip piece from the total acceleration level at the base to obtain the vibration reduction effect value of the pipeline damper;

[0058] 6) Compare the vibration reduction effect value of the pipeline damper with the equipment requirement index to judge whether the vibration reduction effect meets the requirements. That is, the acceleration level at the pipe clip piece is obtained as XX dB. Similarly, the acceleration level at the base is obtained as XX dB. The difference between the two is the specific value of the vibration reduction effect of the damping shock absorber. Then compare it with the equipment requirement index to judge whether the vibration reduction effect meets the requirements.

[0059] Example:

[0060] Fix the prototype on the test bench, then lift the high-frequency shaker and connect it to the prototype upside down. The high-frequency shaker generates the required swept-frequency excitation within the frequency range of 5 - 10,000 Hz. Control the total energy input through the sensor at the excitation rod. This measurement point measures in three directions of X, Y, and Z to ensure that the excitation energy remains consistent after each prototype is installed. In addition to the control point, two more measurement points are respectively arranged at the pipe clip and the damper base to collect the acceleration response in the frequency domain under excitation, and then average the energy of the two measurement points and compare them to obtain the result of the vibration reduction effect. The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pipeline damper vibration reduction effect testing device, characterized in that: The invention comprises an elastic rope (1), a high-frequency exciter (2), an exciting rod (4), a monitoring sensor A1 (6), a monitoring sensor A2 (7), a pipe clamp (8), a monitoring sensor B1 (10), a monitoring sensor B2 (11), a loading bridge (12) and a simulated load (13); the high-frequency exciter (2) is suspended by the elastic rope (1) and inverted above a sample to be tested (9); one end of the exciting rod (4) is connected to the loading bridge (12); the loading bridge (12) is connected to the simulated load (13); the pipe clamp (8) is used to clamp the simulated load (13); the exciting force generated by the high-frequency exciter (2) is transmitted to the sample to be tested (9) through the pipe clamp (8); the monitoring sensor A1 (6) and the monitoring sensor A2 (7) are mounted on the pipe clamp (8); and the monitoring sensor B1 (10) and the monitoring sensor B2 (11) are mounted on a test table; The simulated load (13) is designed to be dumbbell-shaped and is used to simulate the load weight and vibration conditions borne by the pipeline damper; detachable mass adjustment plates (14) are provided at both ends of the simulated load (13); the monitoring sensor A1 (6), the monitoring sensor A2 (7), the monitoring sensor B1 (10) and the monitoring sensor B2 (11) are all acceleration sensors.

2. A pipeline damper vibration reduction effect testing device according to claim 1, characterized in that: The pipeline damper vibration reduction effect testing device also includes a control sensor C (5), which is used to measure the vibration input energy at the excitation rod (4) and ensure that the excitation input is consistent each time by measuring the excitation energy in three directions X, Y, and Z each time.

3. The data processing method of the pipeline damper vibration reduction effect testing device according to claim 1 is characterized in that: The steps include: 1) averaging the acceleration data collected by the monitoring sensor A1 (6) and the monitoring sensor A2 (7) at the pipe clamp (8), and performing unit conversion; 2) Calculate the effective value of the linear acceleration value of all frequency points to obtain the total acceleration value; 3) Convert the total acceleration value into the total acceleration level at the pipe clamp; 4) Calculate the acceleration data collected by the monitoring sensor B1 (10) and the monitoring sensor B2 (11) at the base of the pipeline damper according to the above steps 1)-3) to obtain the total acceleration level at the base; 5) Subtract the total acceleration level at the pipe clamp from the total acceleration level at the base to obtain the vibration reduction effect value of the pipe damper; 6) Compare the vibration reduction effect value of the pipeline damper with the equipment requirement index to determine whether the vibration reduction effect meets the requirements.

4. The data processing method of the pipeline damper vibration reduction effect testing device according to claim 3 is characterized by: In step 1), the unit conversion refers to converting the unit from gravity acceleration to m / s 2 , the formula is: Among them: a i Indicates the average acceleration value corresponding to the i-th frequency point at the pipe clamp, in m / s 2 ; a A1 and a A2 They represent the acceleration values ​​collected by monitoring sensor A1 (6) and monitoring sensor A2 (7), respectively, in g.

5. The data processing method of the pipeline damper vibration reduction effect testing device according to claim 4 is characterized in that: In step 2), the formula for calculating the effective value of the linear acceleration value at all frequency points is: Among them: a total It is the effective value of the linear acceleration at all frequency points.

6. The data processing method of the pipeline damper vibration reduction effect testing device according to claim 5 is characterized by: In step 3), according to the conversion formula between acceleration level and acceleration magnitude: The total acceleration level formula at the pipe clamp is converted into: L total =20×log 10 a total +120; Among them: a ref is the reference acceleration, which is 1×10 -6 m / s 2 , is the reference value of dB level; L total is the total acceleration level at the pipe clamp.

Images