Damping effect testing device for pipeline damper and data processing method

Abstract

The invention relates to the field of pipeline damper vibration reduction effect testing, in particular to a pipeline damper vibration reduction effect testing device which comprises an elastic rope, a high-frequency vibration exciter, a vibration excitation rod, a monitoring sensor A1, a monitoring sensor A2, a pipe clamping piece, a monitoring sensor B1, a monitoring sensor B2, a loading bridge and a simulation load. The high-frequency vibration exciter is hung and inverted above a tested sample piece through an elastic rope, one end of the vibration excitation rod is connected with the loading bridge frame, the loading bridge frame is connected with a simulation load, the pipe clamping piece is used for clamping the simulation load, vibration excitation force generated by the high-frequency vibration exciter is transmitted to the tested sample piece through the pipe clamping piece, the monitoring sensor A1 and the monitoring sensor A2 are installed on the pipe clamping piece, and the monitoring sensor A1 and the monitoring sensor A2 are connected with the loading bridge frame. The monitoring sensor B1 and the monitoring sensor B2 are installed on the test table top. According to the invention, the accuracy, the reliability and the practicability of the vibration reduction effect test of the pipeline damper are obviously improved.

Description

Technical Field

[0001] The invention relates to the field of pipeline damper vibration reduction effect testing, and in particular to a pipeline damper vibration reduction effect testing device and a data processing method, which are suitable for vibration reduction effect experiments of top high-frequency excitation. Background Art

[0002] In the vibration reduction effect test of pipeline dampers, it is always a difficult problem to apply stable high-frequency excitation to the top of the test piece. Since the load of the pipeline damper during normal operation comes from the top (pressure pulses generated by the pipeline fluid), and the traditional vibration table generally gives the entire test piece a vibration input from the bottom of the sample, the conventional method of exciting the damper will cause all parts of the damper to be subjected to equal vibration stress at the same time, which is inconsistent with the actual working situation (conventional dampers are designed 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 ultra-wide bandwidth and displacement requirements of pipeline vibration reduction. In actual applications, it is found that when using this equipment to conduct tests, trade-offs need to be made among various test indicators, and it cannot meet the experimental needs. Summary of the invention

[0003] The present invention discloses a pipeline damper vibration reduction effect testing device and a data processing method, which significantly improves the accuracy, reliability and practicability of the pipeline damper vibration reduction effect test through wide-band vibration testing, flexible simulated load design, a comprehensive data processing method and an optimized experimental device structure.

[0004] In order to achieve the purpose of the present invention, the technical scheme adopted is: a pipeline damper vibration reduction effect testing device, including an elastic rope, a high-frequency exciter, an excitation rod, a monitoring sensor A1, a monitoring sensor A2, a pipe clamp, a monitoring sensor B1, a monitoring sensor B2, a loading bridge and a simulated load. The high-frequency exciter is suspended by an elastic rope and inverted above the sample to be tested, one end of the excitation rod is connected to the loading bridge, the loading bridge is connected to the simulated load, the pipe clamp is used to clamp the simulated load, the exciting force generated by the high-frequency exciter is transmitted to the sample to be tested through the pipe clamp, the monitoring sensors A1 and A2 are installed on the pipe clamp, and the monitoring sensors B1 and B2 are installed on the test table.

[0005] As an optimization solution of the present invention, the simulated load is designed to be 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 optimization solution of the present invention, detachable mass adjustment plates are provided at both ends of the simulated load.

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

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

[0009] In order to achieve the purpose of the present invention, the technical solution adopted is: a data processing method of a pipeline damper vibration reduction effect testing device, comprising the following steps: 1) Average the acceleration data collected by the monitoring sensors A1 and A2 at the pipe clamp and convert the units; 2) Calculate the effective value of the linear acceleration value at 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) According to the above steps 1)-3), calculate the acceleration data collected by the monitoring sensor B1 and the monitoring sensor B2 at the base of the pipeline damper 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.

[0010] As an optimization solution of the present invention, in step 1), the unit conversion is to convert the unit from gravity acceleration to m / s², and the formula is: in: Indicates the average acceleration value corresponding to the i-th frequency point at the pipe clamp, in m / s²; and They respectively represent the acceleration values ​​collected by monitoring sensor A1 and monitoring sensor A2, in g.

[0011] As an optimization solution of the present invention, in step 2), the effective value formula for calculating the acceleration value of all frequency points is: in: It is the effective value (RMS) of the linear acceleration value at all frequency points.

[0012] As an optimization solution of the present invention, in step 3), according to the conversion formula between the acceleration level and the acceleration magnitude level: The total acceleration level formula at the tube clamp is converted to: in: is the reference acceleration, which is 1×10 -6 m / s 2 , is the reference value of dB level; is the total acceleration level at the pipe clamp.

[0013] The present invention has positive effects: 1) The test device of the present invention can cover the wide-band vibration stress test requirements from low frequency to high frequency, and is not only suitable for vibration reduction effect testing, but also can be used for durability testing of dampers. This design can simultaneously meet the requirements of high-frequency and large-displacement working conditions, and expands the scope of application of the test device; 2) The present invention can evaluate the experimental results as a whole, rather than just focusing on the vibration reduction effect of 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, which improves the scientificity and accuracy of data analysis; 3) The present invention uses an elastic rope to suspend the high-frequency exciter and transmits the exciting force to the sample under test through the pipe clamp, avoiding the limitation of the traditional vibration table excitation 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 conduct tests at a lower cost and in a manner close to the original test state, thereby improving the reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] Figure 1 It is a schematic diagram of a half-section structure of a testing device of the present invention from a side view; Figure 2 It is a front view structural schematic diagram of the testing device of the present invention; Figure 3 It is a schematic diagram of the experimental data curve of the present invention.

[0016] Among them: 1. Elastic rope, 2. High-frequency exciter, 3. Moving coil connecting plate, 4. Excitation rod, 5. Control sensor C, 6. Monitoring sensor A1, 7. Monitoring sensor A2, 8. Pipe clamp, 9. Test sample, 10. Monitoring sensor B1, 11. Monitoring sensor B2, 12. Loading bridge, 13. Simulated load, 14. Quality adjustment plate. DETAILED DESCRIPTION

[0017] The method of the present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1As shown, the present invention discloses a vibration reduction effect testing device for a pipeline damper, comprising an elastic rope 1, a high-frequency exciter 2, an exciting rod 4, a monitoring sensor A16, a monitoring sensor A2, a pipe clamp 8, a monitoring sensor B1, a monitoring sensor B2, 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 9 to be tested. One end of the exciting rod 4 is connected to the loading bridge 12, and 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 9 to be tested through the pipe clamp 8. The monitoring sensors A1 and A2 are installed on the pipe clamp 8, and the monitoring sensors B1 and B2 are installed on the test table.

[0019] like Figure 2 As shown, the vibration reduction effect test device of the pipeline damper also includes a control sensor C, which is used to measure the vibration input energy at the excitation rod 4, and ensure that each excitation input is consistent by measuring the excitation energy in three directions (X, Y, and Z) each time. The control sensor C ensures that the excitation energy is the same for each test, thereby improving the reliability and repeatability of the test results. Through multi-dimensional measurement, the distribution of the vibration input energy is more comprehensively reflected, thereby improving the accuracy of the test.

[0020] Monitoring sensor A1, monitoring sensor A2, monitoring sensor B1 and monitoring sensor B2 are all acceleration sensors.

[0021] The simulated load 13 is designed to be in a dumbbell shape and is clamped by the pipe clamp 8. The simulated load 13 is used to simulate the load weight and vibration conditions borne by the pipeline damper.

[0022] By applying vibration excitation, the simulated load 13 can help evaluate the vibration reduction effect of the damper under different load conditions. In order to meet the requirements of different pipe dampers with different loads, detachable mass adjustment plates 14 are set at both ends of the simulated load 13. The flexibility and practicality of the test are increased. At the same time, in order to be as close to reality as possible, the vibration excitation is selected to act on the simulated load 13, rather than directly on the pipe clamp 8. To achieve this goal, there is a simple and efficient method, that is, to hang up the high-frequency exciter 2 with an elastic rope 1, and connect the two ends of the excitation rod 4 to the dynamic coil connecting plate 3 and the loading bridge 12 respectively. The exciting force is transmitted to the sample 9 under test through the pipe clamp 8. The energy finally transmitted to the bottom after the sample is damped is weakened, and the vibration reduction effect is obtained by comparing the acceleration collected by the upper and lower sensors.

[0023] Figure 3For a set of test data curves obtained by the test, taking the curves collected by monitoring sensors A1 and A2 at the pipe clamp as an example, several points are selected in the 5-10000Hz frequency range according to the logarithmic relationship, and the test frequency domain curve is exported into an Excel table to obtain the relationship between the horizontal axis frequency (Hz) and the vertical axis magnitude (g). A data processing method for a pipeline damper vibration reduction effect test device is used for processing, including the following steps: 1) Average the acceleration data collected by monitoring sensor A1 and monitoring sensor A2 at pipe clamp 8, and perform unit conversion; In step 1), the units are converted to convert the units from gravity acceleration to m / s² using the formula: in: Indicates the average acceleration value corresponding to the i-th frequency point at the pipe clamp, in m / s²; and They represent the acceleration values ​​collected by monitoring sensor A1 and monitoring sensor A2, in g. is the value corresponding to a frequency point.

[0024] 2) Calculate the effective value formula of acceleration value at all frequency points; In step 2), the formula for calculating the effective value (RMS) of the acceleration value at all frequency points is: in: It is the effective value (RMS) of the linear acceleration value at all frequency points.

[0025] 3) Convert the total acceleration value to the total acceleration level (dB) at the pipe clamp; In step 3), according to the conversion formula between acceleration level and acceleration magnitude: The total acceleration level formula at the tube clamp is converted to: in: is the reference acceleration, which is 1×10 -6 m / s 2 , is the reference value of dB level; is the total acceleration level at the pipe clamp; 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; 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. That is, the acceleration level at the pipe clamp is XXdB, and the acceleration level at the base is XXdB. The difference between the two is the specific value of the vibration reduction effect of the damping damper, and then compare it with the equipment requirement index to determine whether the vibration reduction effect meets the requirements.

[0026] Example: The prototype is fixed on the test bench, and then the high-frequency exciter is hoisted and connected upside down to the prototype. The high-frequency exciter generates the required sweep frequency excitation in the frequency range of 5-10000Hz. The total energy input is controlled by the sensor at the excitation rod. The measurement point is measured in the three directions of X, Y, and Z to ensure that the excitation energy of each prototype is consistent after installation. In addition to the control point, two measurement points are arranged at the pipe clamp and the damper base respectively to collect the acceleration response of the frequency domain under excitation, and then the energy of the two measurement points is averaged and compared to obtain the vibration reduction effect.

[0027] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in 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). The monitoring sensor B1 (10) and the monitoring sensor B2 (11) are mounted on the test table.

2. A pipeline damper vibration reduction effect testing device according to claim 1, characterized in that: The simulated load (13) is designed to be in a dumbbell shape, and the simulated load (13) is used to simulate the load weight and vibration conditions borne by the pipeline damper.

3. A pipeline damper vibration reduction effect testing device according to claim 2, characterized in that: Removable mass adjustment plates (14) are provided at both ends of the simulated load (13).

4. A pipeline damper vibration reduction effect testing device according to claim 3, characterized in that: The pipeline damper vibration reduction effect test 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.

5. A pipeline damper vibration reduction effect testing device according to claim 4, characterized in that: 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.

6. A data processing method using a pipeline damper vibration reduction effect testing device according to claim 1, characterized in that: The steps include: 1) Calculate the average of the acceleration data collected by the monitoring sensor A1 (6) and the monitoring sensor A2 (7) at the pipe clamp (8), and perform unit conversion; 2) Calculate the effective value of the linear acceleration value at 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) to 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.

7. The data processing method of the pipeline damper vibration reduction effect testing device according to claim 6 is characterized by: In step 1), the units are converted to convert the units from gravity acceleration to m / s² using the formula: ； in: Indicates the average acceleration value corresponding to the i-th frequency point at the pipe clamp, in m / s²; and They represent the acceleration values ​​collected by monitoring sensor A1 (6) and monitoring sensor A2 (7), respectively, in g.

8. The data processing method of the pipeline damper vibration reduction effect testing device according to claim 7 is characterized by: In step 2), the formula for calculating the effective value of the acceleration value at all frequency points is: ； in: It is the effective value of the linear acceleration at all frequency points.

9. The data processing method of the pipeline damper vibration reduction effect testing device according to claim 8, characterized in that: In step 3), according to the conversion formula between acceleration level and acceleration magnitude: ； The total acceleration level formula at the tube clamp is converted to: ； in: is the reference acceleration, which is 1×10 -6 m / s 2 , is the reference value of dB level; is the total acceleration level at the pipe clamp.

Images