Porous wave absorbing material testing equipment and method

Abstract

The invention relates to the technical field of porous media, and discloses a porous wave absorbing material testing device and method.The porous wave absorbing material testing device comprises a gas storage tank and further comprises a gas pipe arranged on one side of the gas storage tank and an electromagnetic valve arranged on the outer side of the gas pipe; the testing assembly is arranged at one end of the air pipe and comprises a sealing cover arranged at one end of the air pipe, a first testing pipeline is arranged on the side, away from the air pipe, of the sealing cover, one end of the first testing pipeline is communicated with a second testing pipeline, and one end of the second testing pipeline is communicated with a third testing pipeline; a pulsating pressure sensor is arranged in the first test pipeline; by arranging the testing assembly, compression waves generated when a high-speed train enters a tunnel can be simulated, the wave absorbing capacity of the porous medium is tested, and then the testing efficiency and testing accuracy of the porous wave absorbing material are improved.

Description

Technical Field

[0001] The invention relates to the technical field of porous media, and in particular to a porous wave-absorbing material testing device and method. Background Art

[0002] Porous media refers to materials composed of a skeleton composed of solid matter and a large number of densely packed tiny voids separated by the skeleton. These voids may be connected or disconnected, and their size, shape and distribution may vary. These void spaces are usually occupied by liquid or gas (or gas-liquid two phases). The main physical characteristics of porous media are extremely small void size and large specific surface area. When sound waves encounter porous media, part of the sound wave energy will be absorbed by the voids inside the medium, part of the sound waves will be scattered between the voids, and the remaining sound waves may continue to propagate or be reflected. This complex interaction enables porous media to effectively reduce the intensity of sound waves, thereby achieving the effect of wave attenuation.

[0003] At present, when a high-speed train runs in a closed pipe, a compression wave will be generated along the front direction of the train. When the compression wave propagates to the tail end of the pipe, it will rebound and collide with the high-speed train, which will cause the compression wave to interfere with the high-speed train and affect the running of the high-speed train. In order to reduce the impact of this compression wave on the running high-speed train, it is necessary to set a porous medium wave-absorbing device at the end of the closed pipe. The device mainly contains porous medium wave-absorbing materials. The compression wave is absorbed by the characteristics of the porous medium wave-absorbing materials, the rebound of the compression wave is reduced, and the impact of the compression wave on the high-speed train is reduced. The development of porous medium wave-absorbing materials should not only consider the wave-absorbing ability of the compression wave, but also the elastic recovery ability and strength of the porous medium wave-absorbing materials, to ensure that the porous medium materials will not collapse and compress significantly during use, affecting the wave-absorbing ability. Therefore, a porous wave-absorbing material testing device is needed. However, when some existing porous wave-absorbing testing devices are used, their testing and development processes are time-consuming and costly. At the same time, during the test process, due to the influence of various factors such as material structure, density, thickness and composition, the test efficiency of the porous wave-absorbing materials is reduced. Summary of the invention

[0004] The purpose of the present invention is to provide a porous wave-absorbing material testing device and method to solve the problem that some porous wave-absorbing material testing devices have low testing and development efficiency, are time-consuming, and have high testing costs.

[0005] To achieve the above object, the present invention provides the following technical solution: a porous wave-absorbing material testing device, comprising a gas storage tank, and further comprising:

[0006] An air pipe is arranged on one side of the air storage tank, and an electromagnetic valve is arranged on the outside of the air pipe;

[0007] A test assembly is arranged at one end of the trachea, and the test assembly includes a sealing cover arranged at one end of the trachea, a first test pipe is arranged on the side of the sealing cover away from the trachea, one end of the first test pipe is connected to the second test pipe, one end of the second test pipe is connected to the third test pipe, and a pulsating pressure sensor is arranged inside the first test pipe.

[0008] Preferably, a first flange is fixedly connected to the outer side of the first test pipe, and a second flange and a third flange are fixedly connected to the outer side of the second test pipe, respectively.

[0009] Preferably, a fourth flange is fixedly connected to the outer side of the third test pipe, and an inner tube is fixedly connected to one side of the sealing cover.

[0010] Preferably, a first sealing ring is arranged on the outer side of the inner tube, and a placement groove for use with the first sealing ring is opened inside the inner tube.

[0011] Preferably, a second sealing ring is disposed inside the second flange, and a first connecting groove for use with the second sealing ring is formed inside the second flange.

[0012] Preferably, a first positioning bolt is disposed inside the second flange, and a first screw hole used in conjunction with the first positioning bolt is provided inside both the first flange and the second flange.

[0013] Preferably, a third sealing ring is arranged inside the fourth flange, and a second connecting groove for use with the third sealing ring is opened inside the fourth flange.

[0014] Preferably, a second positioning bolt is disposed inside the fourth flange, and a second screw hole for use with the second positioning bolt is opened inside the fourth flange.

[0015] The present invention also provides a method for testing porous wave-absorbing materials, comprising the following steps:

[0016] S1. Equipment inspection and calibration: Calibrate the pulsation pressure sensor and oscilloscope, and process and prepare each test pipeline;

[0017] S2. Test pipeline assembly: clean and assemble each test pipeline, then fill the inside of the test pipeline with porous medium wave-absorbing material, and connect the test pipeline;

[0018] S3. Equipment installation and connection: Install the pulsation pressure sensor and oscilloscope, and connect the gas tank, gas pipe, solenoid valve booster valve and high-pressure gas source;

[0019] S4, test and debugging: open the high-pressure gas source, adjust the booster valve, adjust the pressure parameters of the gas tank, then close the high-pressure gas source, open the solenoid valve, check the test pipeline, and adjust the oscilloscope parameters;

[0020] S5. Test operation: Open the high-pressure gas source, increase the gas source pressure through the booster pump, store the high-pressure gas in the gas tank, close the gas source pipeline, and while ensuring that the gas source pipeline is closed, open the solenoid valve to discharge the high-pressure gas in the gas tank and enter the test pipeline through the air pipe to form a compression wave;

[0021] S6. Data recording and processing: export the experimental data recorded by the oscilloscope through the computer, and organize and analyze the data;

[0022] S7. Equipment cleaning: Turn off the high-pressure gas source and solenoid valve, exhaust the gas inside the test pipeline, and clean each test pipeline.

[0023] In S2, the diameter of the test pipe is 100 mm and the length of the pipe is 50 mm.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention sets a test component. Under the action of a gas storage tank and a gas cylinder, the gas transported by a high-pressure gas source can enter the test pipeline through the gas storage tank and the gas pipe, thereby testing the performance of the porous wave-absorbing material inside the test pipeline. At the same time, under the action of the solenoid valve, the flow of the gas can be accurately controlled to achieve automation and precision of the test process. At the same time, by setting a first test pipeline, a second test pipeline and a third test pipeline, different test points or sensors can be set on different pipelines according to actual needs to comprehensively evaluate the performance of the porous medium wave-absorbing material. Under the action of the pulsating pressure sensor, the pressure change in the test pipeline can be monitored in real time, providing a key to analyzing the performance of the porous medium wave-absorbing material. Key data, at the same time, the pulsating pressure sensor can also reflect the flow characteristics of the gas in the pipeline, which is helpful for in-depth research on the wave-breaking mechanism of the wave-breaking material; by setting the first flange, the second flange and the second sealing ring, the first test pipeline and the second test pipeline can be tightly connected to prevent gas leakage during the test. At the same time, under the action of the third flange, the fourth flange and the second sealing ring, the second test pipeline and the third test pipeline can be tightly connected to prevent gas leakage; by setting the first connecting bolt and the second connecting bolt, it is convenient for the staff to disassemble each flange, thereby disassembling and cleaning each test pipeline, and at the same time, it is convenient for the staff to fill the porous wave-breaking material;

[0026] 2. The present invention sets up a test pipeline, which utilizes high-speed airflow flowing in the pipeline to simulate the compression wave generated when a high-speed train enters a tunnel. The test method and test equipment are optimized through experimental simulation, and the main factors of the wave-absorbing capacity of the porous medium are tested at the same time, thereby facilitating the testing and development of porous wave-absorbing materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of a preferred embodiment of the porous wave-absorbing material testing device provided by the present invention;

[0028] Figure 2 A schematic diagram of the test assembly structure provided by the present invention;

[0029] Figure 3 A schematic diagram of the connection between the first test pipe and the sealing cover structure provided by the present invention;

[0030] Figure 4 A schematic diagram of the structural connection between the first test pipeline and the second test pipeline provided by the present invention;

[0031] Figure 5 A schematic diagram of the structural connection between the second test pipeline and the third test pipeline provided by the present invention;

[0032] Figure 6 A structural flow chart of a preferred embodiment of the porous wave-absorbing material testing method provided by the present invention.

[0033] In the figure: 1. gas storage tank; 2. air pipe; 3. solenoid valve; 4. test assembly; 41. sealing cover; 42. first test pipe; 43. second test pipe; 44. third test pipe; 45. pulsating pressure sensor; 5. first flange; 6. second flange; 7. third flange; 8. fourth flange; 9. inner tube; 10. placement groove; 11. first sealing ring; 12. second sealing ring; 13. first connecting groove; 14. first positioning bolt; 15. first screw hole; 16. third sealing ring; 17. second connecting groove; 18. second positioning bolt; 19. second screw hole. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-5As shown, a porous wave-absorbing material testing device includes a gas storage tank 1. Under the action of the gas storage tank 1, the gas transported by the high-pressure gas source can be stored, so that the gas pressure inside the gas storage tank 1 can simulate the pressure that a high-speed train bears when traveling. It also includes: an air pipe 2 arranged on one side of the gas storage tank 1. Under the action of the air pipe 2, the gas inside the gas storage tank 1 can be transported through the air pipe 2. An electromagnetic valve 3 is arranged on the outside of the air pipe 2. Under the action of the electromagnetic valve 3, it is convenient for staff to control the release of the high-pressure gas inside the gas storage tank 1; a test component 4 is arranged at one end of the air pipe 2. Under the action of the test component 4, the porous wave-absorbing material inside the test pipe can be tested. The performance of the wave material is tested, the test component 4 includes a sealing cover 41 arranged at one end of the air pipe 2, by setting the sealing cover 41, the first test pipe 42 can be sealed, and at the same time, the internal gas of the gas storage tank 1 will not be hindered from entering the first test pipe 42, and the first test pipe 42 is arranged on the side of the sealing cover 41 away from the air pipe 2, one end of the first test pipe 42 is connected to the second test pipe 43, and one end of the second test pipe 43 is connected to the third test pipe 44, and the first test pipe 42 is arranged inside the pulsating pressure sensor 45, under the action of the pulsating pressure sensor 45, the compression wave passing through the pulsating pressure sensor 45 can be recorded.

[0036] refer to Figure 2 and Figure 3 As shown, the outer side of the first test pipe 42 is fixedly connected with a first flange 5. By setting the first flange 5 and the second flange 6, it is convenient for the staff to connect and disassemble the first test pipe 42 and the second test pipe 43. The outer side of the second test pipe 43 is respectively fixedly connected with a second flange 6 and a third flange 7. Under the action of the third flange 7 and the fourth flange 8, it is convenient for the staff to connect and disassemble the second test pipe 43 and the third test pipe 44.

[0037] A fourth flange 8 is fixedly connected to the outer side of the third test pipe 44, and an inner tube 9 is fixedly connected to one side of the sealing cover 41. Under the action of the sealing cover 41 and the inner tube 9, one end of the first test pipe 42 can be sealed without affecting the internal gas of the gas storage tank 1 entering the interior of the first test pipe 42 through the gas pipe 2.

[0038] A first sealing ring 11 is arranged on the outer side of the inner tube 9. With the function of the first sealing ring 11, the first test pipe 42 can be sealed. A placement groove 10 for use with the first sealing ring 11 is opened inside the inner tube 9. With the function of the placement groove 10, the first sealing ring 11 can be placed in a designated position, so that the first sealing ring 11 can be tightly connected to the inner wall of the first test pipe 42.

[0039] refer to Figure 4 and Figure 5As shown, a second sealing ring 12 is arranged inside the second flange 6. Under the action of the second sealing ring 12, the connection between the first flange 5 and the second flange 6 can be sealed, so that the first test pipe 42 and the second test pipe 43 can be tightly connected, so that the porous wave-absorbing material can prevent gas leakage during testing. The inside of the second flange 6 begins to have a first connecting groove 13 used in conjunction with the second sealing ring 12.

[0040] A first positioning bolt 14 is provided inside the second flange 6, and a first screw hole 15 used in conjunction with the first positioning bolt 14 is provided inside the first flange 5 and the second flange 6. Under the action of the first positioning bolt 14 and the first screw hole 15, the first positioning bolt 14 is rotated so that the first positioning bolt 14 passes through the first screw hole 15 inside the second flange 6 and the first flange 5, so that the first flange 5 and the second flange 6 can be tightly connected, and it is convenient for the staff to disassemble and assemble them.

[0041] A third sealing ring 16 is arranged inside the fourth flange 8, and a second connecting groove 17 used in conjunction with the third sealing ring 16 is opened inside the fourth flange 8. Under the action of the third sealing ring 16, the connection between the third flange 7 and the fourth flange 8 can be sealed, thereby making the second test pipe 43 and the third test pipe 44 tightly connected, thereby preventing gas leakage.

[0042] A second positioning bolt 18 is arranged inside the fourth flange 8, and a second screw hole 19 used in conjunction with the second positioning bolt 18 is opened inside the fourth flange 8. Under the action of the second screw hole 19 and the second positioning bolt 18, the third flange 7 and the fourth flange 8 can be tightly connected to prevent gas leakage.

[0043] See also Figure 6 As shown, the present invention also provides a method for testing porous wave-absorbing materials, comprising the following steps:

[0044] S1. Equipment inspection and calibration: Calibrate the pulsating pressure sensor 45 and the oscilloscope, and process and prepare each test pipeline; ensure the accuracy and reliability of the pulsating pressure sensor 45 and the oscilloscope, and provide an accurate data basis for subsequent tests. At the same time, the processing and preparation of the test pipeline can ensure the consistency and stability of the test environment and reduce test errors.

[0045] S2. Test pipeline assembly: clean and assemble each test pipeline, then fill the inside of the test pipeline with porous medium wave-absorbing material and connect the test pipelines; cleaning and assembling the test pipeline can ensure that there are no impurities inside the pipeline to avoid interference with the test results, and filling with porous medium wave-absorbing material can effectively absorb and weaken the reflected waves and interference waves generated during the test, thereby improving the accuracy and stability of the test, and connecting the test pipelines can ensure the integrity and reliability of the test system.

[0046] S3. Equipment installation and connection: Install the pulsation pressure sensor 45 and the oscilloscope, and connect the gas tank 1, the gas pipe 2, the solenoid valve 3, the booster valve and the high-pressure gas source; Correct installation of the pulsation pressure sensor 45 and the oscilloscope can ensure that they can accurately record the test data.

[0047] S4, test and debugging: open the high-pressure gas source, adjust the boost valve, adjust the pressure parameters of the gas tank 1, then close the high-pressure gas source, open the solenoid valve 3, check the test pipeline, and adjust the oscilloscope parameters; by adjusting the boost valve and adjusting the pressure parameters of the gas tank 1, different test conditions can be simulated to evaluate the performance and reliability of the equipment. At the same time, closing the high-pressure gas source and opening the solenoid valve 3 can check whether the test pipeline is connected correctly and whether there are any leakage problems.

[0048] S5. Test operation: Open the high-pressure gas source, increase the gas source pressure through the booster pump, store the high-pressure gas in the gas tank 1, close the gas source pipeline, and while ensuring that the gas source pipeline is closed, open the solenoid valve 3 to discharge the high-pressure gas in the gas tank 1 and enter the test pipeline through the air pipe 2 to form a compression wave; increasing the gas source pressure through the booster pump can ensure that enough high-pressure gas is stored in the gas tank 1 to meet the test requirements. At the same time, closing the gas source pipeline and opening the solenoid valve 3 can quickly discharge the high-pressure gas to form a compression wave, thereby simulating real working conditions and evaluating the performance and reliability of the equipment.

[0049] S6. Data recording and processing: Export the experimental data recorded by the oscilloscope through the computer, and organize and analyze the data; export the experimental data recorded by the oscilloscope through the computer, which can be conveniently analyzed and processed later. Organizing and analyzing the data can extract useful information to evaluate the performance and reliability of the equipment and provide a basis for subsequent optimization and improvement.

[0050] S7. Equipment cleaning: Close the high-pressure gas source and solenoid valve 3, exhaust the gas inside the test pipeline, and clean each test pipeline; increase the gas source pressure through the booster pump to ensure that enough high-pressure gas is stored in the gas storage tank 1 to meet the test requirements. Closing the gas source pipeline and opening the solenoid valve 3 can quickly discharge the high-pressure gas to form a compression wave, thereby simulating real working conditions and evaluating the performance and reliability of the equipment.

[0051] In S2, the test pipe diameter is 100 mm and the pipe length is 5000 mm.

[0052] Working principle: First, check and calibrate the key equipment of pulsation pressure sensor 45, oscilloscope, gas tank 1, solenoid valve 3, booster pump and high-pressure gas source to ensure their accuracy and reliability. At the same time, process and prepare the test pipeline to ensure that the interior is smooth and free of impurities to provide a stable environment for the test. Clean and assemble the test pipeline, connect the first test pipeline 42 and the second test pipeline 43 through the second flange 6 and the first flange 5, and place the second sealing ring 12 so that the first test pipeline 42 and the second test pipeline 43 can be tightly connected. Then, connect the second test pipeline 43 and the third test pipeline 44 through the third flange 7 and the fourth flange 8 so that the second test pipeline 43 and the third test pipeline 44 are tightly connected. At the same time, fill the inside of the test pipeline with porous medium wave-absorbing material, and connect the components to ensure the integrity and sealing of the test system. Then correctly install the pulsation pressure sensor 45, oscilloscope and other equipment into the test system, connect the gas tank 1, air pipe 2, solenoid valve 3, booster valve and high-pressure gas source, turn on the high-pressure gas source, and adjust the boost pressure The valve adjusts the pressure parameters in the gas tank 1 to simulate different test conditions. After closing the high-pressure gas source, open the solenoid valve 3, check the connection and sealing of the test pipeline, and adjust the parameters of the oscilloscope to ensure that the test data can be accurately recorded. Then open the high-pressure gas source, increase the gas source pressure through the booster pump, store the high-pressure gas in the gas tank 1, and then close the gas source pipeline, open the solenoid valve 3, and the high-pressure gas in the gas tank 1 enters the test pipeline through the air pipe 2 to form a compression wave. During the propagation process, the compression wave encounters the porous medium wave-absorbing material filled in the process. The material absorbs and weakens the energy of the compression wave, reduces its reflection and transmission intensity, and the pulsating pressure sensor 45 collects the pressure change data in the test pipeline in real time, and the oscilloscope displays and records these data. After the test, the experimental data recorded by the oscilloscope is exported to the computer for sorting and analysis. By comparing the data under different test conditions, the performance of the porous medium wave-absorbing material is evaluated. According to the data analysis results, it is evaluated whether the performance of the wave-absorbing material meets the design requirements. If not, it is necessary to optimize the material or adjust the test parameters to further improve its performance.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A porous wave-absorbing material testing device, comprising a gas storage tank (1), characterized in that: Also includes: An air pipe (2) arranged on one side of the air storage tank (1), and an electromagnetic valve (3) arranged on the outside of the air pipe (2); A test assembly (4) is arranged at one end of an air pipe (2), the test assembly (4) comprising a sealing cover (41) arranged at one end of the air pipe (2), a first test pipe (42) being arranged on a side of the sealing cover (41) away from the air pipe (2), one end of the first test pipe (42) being connected to a second test pipe (43), one end of the second test pipe (43) being connected to a third test pipe (44), and a pulsating pressure sensor (45) being arranged inside the first test pipe (42).

2. A porous wave-absorbing material testing device according to claim 1, characterized in that: The outer side of the first test pipe (42) is fixedly connected to a first flange (5), and the outer side of the second test pipe (43) is respectively fixedly connected to a second flange (6) and a third flange (7).

3. The porous wave-absorbing material testing device according to claim 1, characterized in that: A fourth flange (8) is fixedly connected to the outer side of the third test pipe (44), and an inner pipe (9) is fixedly connected to one side of the sealing cover (41).

4. A porous wave-absorbing material testing device according to claim 3, characterized in that: A first sealing ring (11) is arranged on the outer side of the inner tube (9), and a placement groove (10) for use with the first sealing ring (11) is provided inside the inner tube (9).

5. The porous wave-absorbing material testing device according to claim 2, characterized in that: A second sealing ring (12) is arranged inside the second flange (6), and a first connecting groove (13) for use with the second sealing ring (12) is provided inside the second flange (6).

6. The porous wave-absorbing material testing device according to claim 2, characterized in that: A first positioning bolt (14) is arranged inside the second flange (6), and a first screw hole (15) for use with the first positioning bolt (14) is provided inside both the first flange (5) and the second flange (6).

7. The porous wave-absorbing material testing device according to claim 3, characterized in that: A third sealing ring (16) is arranged inside the fourth flange (8), and a second connecting groove (17) for use with the third sealing ring (16) is opened inside the fourth flange (8).

8. The porous wave-absorbing material testing device according to claim 3, characterized in that: A second positioning bolt (18) is arranged inside the fourth flange (8), and a second screw hole (19) for use with the second positioning bolt (18) is opened inside the fourth flange (8).

9. A method for testing porous wave-absorbing materials according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Equipment inspection and calibration: Calibrate the pulsating pressure sensor (45) and the oscilloscope, and process and prepare each test pipeline; S2. Test pipeline assembly: clean and assemble each test pipeline, then fill the inside of the test pipeline with porous medium wave-absorbing material, and connect the test pipeline; S3, equipment installation and connection: install the pulsation pressure sensor (45) and the oscilloscope, and connect the gas storage tank (1), the gas pipe (2), the solenoid valve (3), the booster valve and the high-pressure gas source; S4, test and debugging: open the high-pressure gas source, adjust the boost valve, adjust the pressure parameters of the gas storage tank (1), then close the high-pressure gas source, open the solenoid valve (3), check the test pipeline, and adjust the oscilloscope parameters; S5, test operation: open the high-pressure gas source, increase the gas source pressure through the booster pump, store the high-pressure gas in the gas storage tank (1), close the gas source pipeline, and while ensuring that the gas source pipeline is closed, open the solenoid valve (3) to discharge the high-pressure gas in the gas storage tank (1) and enter the test pipeline through the gas pipe (2), thereby forming a compression wave; S6. Data recording and processing: export the experimental data recorded by the oscilloscope through the computer, and organize and analyze the data; S7. Equipment cleaning: Turn off the high-pressure gas source and the solenoid valve (3), exhaust the gas inside the test pipeline, and clean each test pipeline.

10. A method for testing porous wave-absorbing materials according to claim 9, characterized in that: In S2, the diameter of the test pipe is 100 mm and the length of the pipe is 5000 mm.

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