CN105806443B - Liquid level measuring system of shaking test storage tank - Google Patents

Abstract

The invention relates to a liquid level measuring system of a shaking test storage tank, wherein a first branch pipeline is connected with a filling and draining unit and the bottom of the test storage tank, a second branch pipeline is connected with the bottommost end of the test storage tank and a communicating pipeline, the communicating pipeline is connected with the second branch pipeline and a liquid level measurement organic glass pipe, an air outlet at the upper end of the test storage tank is communicated with an upper port of the liquid level measurement organic glass pipe or both the air outlet and the upper port of the liquid level measurement organic glass pipe are communicated with the atmosphere, a first clamp is arranged between the filling and draining unit and the test storage tank, and a second clamp is arranged between the second branch pipeline and the communicating pipeline. The invention utilizes the principle of a communicating vessel, and accurately measures the liquid level height in the storage tank through the liquid level measuring organic glass tube, thereby realizing the accurate filling of each liquid level of the propellant simulation liquid in the test storage tank; the clamp connection pipeline capable of being disassembled and assembled quickly is used, so that the pipeline and the test storage tank can be disassembled and assembled quickly, the state conversion efficiency is greatly improved, and the negative influence of the subsidiary pipeline on the shaking test result is reduced.

Description

A sloshing test tank liquid level measurement system

technical field

The invention relates to the technical field of liquid sloshing test, in particular to a liquid level measuring system of a sloshing test tank and a method of using the same.

Background technique

With the development of liquid fuel aircraft to high speed and high altitude, in terms of weight, aircraft fuel accounts for an increasing proportion of the total weight. For a series of large aircraft such as launch vehicles, intercontinental missiles, satellites or spaceships, the weight of fuel can often account for as much as 90% of the total weight; therefore, the sloshing of liquid fuel has an impact on the flight performance of the aircraft, especially for the stability and stability of the aircraft. The effects of manipulation cannot be ignored.

The aircraft will generate strong vibration during the flight, which will cause the liquid fuel to slosh in the tank. Because such sloshing often has a lower natural frequency, it is usually easier to couple with the control system than the bending vibration, which will affect the aircraft. The stability and handling performance are more potentially dangerous. Therefore, the research on the sloshing characteristics and the method of suppressing the sloshing is a very important subject in the design of liquid fuel aircraft.

The sloshing dynamics parameters such as sloshing frequency, damping and sloshing mass can be obtained by the tank liquid sloshing test method. During the flight of a liquid fuel aircraft, the liquid level of the liquid fuel in the tank will decrease with the consumption of fuel, and the corresponding sloshing kinetic parameters will also change with the change of the liquid level. Therefore, it is necessary to test for different liquid levels in the test. The liquid sloshing test of the test tank is carried out. In order to obtain the sloshing dynamics parameters under different flight states, multiple liquid levels need to be designed for the liquid sloshing test, and since the sloshing dynamics parameters change drastically in special positions (such as the position of the anti-sloshing plate), it is necessary to set more liquid levels to obtain the detailed results. changing laws. Therefore, improving the accuracy of liquid propellant level measurement and the efficiency of state conversion is of great practical significance for the tank liquid sloshing test.

With the continuous increase of the diameter of the aircraft fuel tank, a small liquid level deviation when the tank is filled with the propellant simulated liquid in the test will also cause a large change in the liquid quality, which will have a direct impact on the sloshing dynamics parameters. Therefore, it is necessary to further improve the liquid level measurement accuracy of large test tanks. In the prior art, the transparent part of the tank is usually used to directly measure the liquid level with a ruler; the pipeline is connected by a threaded structure, and the disassembly process is very complicated. The main problems in filling, measuring and draining the liquid level of the existing tank liquid sloshing test are: first, the accuracy of the traditional measurement method for large test tanks is often too large, and the accuracy needs to be improved; second, the storage tank After the liquid management device is installed at the inner bottom, it is inconvenient to fill, drain and measure the liquid propellant simulated liquid. Third, the disassembly and assembly of the pipeline is cumbersome and takes a long time, which reduces the efficiency of state conversion. In order to solve the above technical problems, the present invention designs a liquid level measurement system for a sloshing test tank.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a liquid level measurement system of the shaking test tank, which can ensure the accurate filling of each liquid level of the propellant simulated liquid in the test tank, and improve the liquid level measurement accuracy of the large test tank; Quick disassembly and assembly, improve the efficiency of state conversion, and reduce the negative impact of the attached pipeline on the shaking test results.

The invention is a liquid level measurement system of a shaking test tank, including a filling and draining unit, a test tank, a liquid level measuring plexiglass tube with a fixed scale, a first branch pipeline, a second branch pipeline and a connecting pipe road.

The exhaust port at the upper end of the test tank is communicated with the upper port of the liquid level measuring plexiglass tube, or both are communicated with the atmosphere.

The first branch pipeline includes a first pipeline, a second pipeline, and a first shut-off valve. The filling and draining system unit is connected to the first pipeline, and the bottom of the test tank is connected to the second pipeline. A first shut-off valve is installed between the pipeline and the second pipeline.

The second branch pipeline includes a third pipeline and a second shut-off valve, and the third pipeline is connected to the bottommost end of the test tank and the second shut-off valve.

The communication pipeline includes a fourth pipeline, a third stop valve, and a fifth pipeline. The fourth pipeline is connected to the second stop valve of the second branch pipeline, and the fifth pipeline is connected to the liquid level measuring plexiglass tube. In the lower port, the third shut-off valve is installed between the fourth pipeline and the fifth pipeline.

The liquid level measurement system of the present invention further includes a first clamp and a second clamp, the first clamp is installed at the connection end of the first stop valve and the first pipeline, and the second clamp is installed At the connection end of the second shut-off valve and the fourth pipeline of the communication pipeline.

The liquid level measurement system of the present invention further includes a video monitoring unit, which is composed of a test tank monitoring device and a liquid level measurement plexiglass tube monitoring device.

The liquid level measurement system of the present invention further comprises a lower end fixing device, an upper end fixing device and a dust cover, which are respectively installed on the lower end, upper end and upper port of the liquid level measuring plexiglass tube.

The liquid level measurement system of the present invention, its measurement method comprises the following steps:

Step 1, open the second stop valve and the third stop valve;

Step 2: Open the filling and discharging unit to fill the simulated propellant liquid, open the first stop valve, and close the first stop valve when the liquid in the second branch pipeline is full and just reaches the bottom position of the test tank, which is recorded as the zero position at the bottom of the tank. , read the actual height of the liquid level when the plexiglass tube is at the zero position, and record it;

Step 3: Obtain the relative height of the liquid level from the bottom of the tank according to the test requirements, and then calculate the actual height of the target with reference to the zero position of the bottom of the tank;

Step 4, add measurement;

Step 4.1, keep the second shut-off valve and the third shut-off valve open to ensure that the exhaust port at the upper end of the test tank and the upper end of the plexiglass tube for liquid level measurement are connected to the atmosphere;

Step 4.2, open the filling and discharging unit and open the first shut-off valve, fill the propellant simulation liquid into the test tank, and observe the test tank and the liquid level through the test tank monitoring device and the liquid level measurement plexiglass tube monitoring device. Measure the liquid level change of the plexiglass tube;

Step 4.3, when the height of the liquid level is close to the specified scale, control the first stop valve to slow down the filling flow and perform accurate filling;

Step 4.4, when the liquid level reaches the target actual height, close the first stop valve to stop filling, keep the liquid level stable and mark the height of the liquid level;

Step 5, close the second stop valve and the third stop valve, remove the first clamp, the second clamp and their accompanying pipelines;

Step 6, carry out the tank shaking test; after the test is completed, connect the test tank to the first pipeline and the communication pipeline again, open the filling and discharging unit to drain the propellant simulated liquid, and repeat the process from steps 1 to 6. , to complete the measurement of the next liquid level state.

The invention is a liquid level measurement system of a shaking test tank, which utilizes the principle of a connector and accurately measures the liquid level height in the tank through a liquid level measuring plexiglass tube, so as to realize the accurate measurement of each liquid level of the propellant simulated liquid in the test tank. Filling, especially for large test tanks, can effectively reduce measurement errors.

The invention uses a clamp that can be quickly disassembled to connect the pipeline, so that the pipeline and the test tank can be quickly disassembled, greatly improving the efficiency of state conversion, reducing the artificial strength, and reducing the vibration of the attached pipeline. Negative effects of test results.

The invention also designs a video monitoring unit, through which the monitoring device can simultaneously observe the liquid level in the plexiglass tube and the liquid level height change in the storage tank in real time. Vibration form, the monitoring data can also be transmitted to the computer for recording or processing, which further improves the liquid level measurement system of the shaking test tank according to the present invention.

Description of drawings

Figure 1 is a schematic diagram of the association of six functional units.

Figure 2 is a schematic diagram of the test device.

Among them, 1. Shaking unit, 2. Control acquisition unit, 3. Video monitoring unit, 4. Test tank unit, 5. Filling and discharging unit, 6. Liquid level measurement unit, 7. Liquid management device, 8. Dustproof Cover, 9. Fixing device at upper end, 10. Plexiglass tube for liquid level measurement, 11. Ruler, 12. Fixing device at lower end, 13. Test tank, 14. First pipeline, 15. Second pipeline, 16. Three pipelines, 17, fourth pipeline, 18, fifth pipeline, 19, first stop valve, 20, second stop valve, 21, third stop valve, 22, test tank monitoring device, 23, liquid Position measurement plexiglass tube monitoring device.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

The sloshing test tank liquid level measurement system of the present invention is applied to the tank liquid sloshing test. The test device is composed of six functional units, namely: a sloshing unit 1, a control and acquisition unit 2, a video monitoring unit 3, and a test unit. Tank unit 4, filling and draining unit 5, liquid level measuring unit 6. The working principle is shown in Figure 1. The control acquisition unit 2 controls the shaking unit 1 to generate a shaking force that meets the test conditions, and collects the actual shaking test data parameters of the shaking unit 1. The shaking unit 1 makes the test tank unit 4 produce corresponding shaking, The filling and draining unit 5 fills or drains the simulated propellant liquid for the test tank unit 4, the liquid level measuring unit 6 is used to accurately measure the liquid level in the test tank unit 4, and the video monitoring unit 3 is used for real-time observation of the test tank. The liquid level in the tank unit 4 and in the liquid level measuring unit 6 varies in height.

The test device involved in the liquid level measurement system of the present invention is shown in Figure 2:

The test tank unit 4 consists of a test tank 13, a liquid management device 7, and an anti-sloshing device. The liquid management device 7 is set at the bottom of the test tank to control the liquid sloshing. The anti-sloshing device is installed in the test tank. Near the height of the liquid level with a large sloshing amplitude, it is used to reduce the sloshing of the liquid level;

The liquid level measurement unit 6 is composed of a communication pipeline, a lower end fixing device 12, a liquid level measurement plexiglass tube 10 with a fixed scale 11, an upper end fixing device 9 and a dust cover 8. The liquid level measurement plexiglass tube 10 is installed In the lower end fixing device 12, the lower end fixing device 12 plays the role of supporting, sealing and fixing the liquid level measuring plexiglass tube 10, and the upper end fixing device 9 plays the role of fixing the liquid level measuring plexiglass tube 10, and can measure the liquid level. The plexiglass tube 10 is slightly adjusted for levelness and verticality, and a dust cover 8 is installed on the port of the plexiglass tube 10 for liquid level measurement;

The video monitoring unit 3 is composed of two monitoring devices, namely the test tank monitoring device 22 and the liquid level measurement plexiglass tube monitoring device 23, which are used to simultaneously observe the liquid level of the test tank 13 and the liquid level measurement plexiglass tube 10 in real time. Altitude changes.

A liquid level measurement system for a shaking test tank according to the present invention, as shown in FIG. 2, includes a filling and draining unit 5, a test tank 13, a liquid level measuring plexiglass tube 10 with a fixed scale 11, a first A branch line, a second branch line, and a communication line.

The liquid level measurement system of the present invention adopts the principle of a connector. During operation, it is necessary to ensure that the exhaust port at the upper end of the test tank 13 is connected to the upper port of the liquid level measurement plexiglass tube 10 or both are connected to the atmosphere. The scale 11 of the glass tube 10 reads the height value of the liquid level. For example, if the exhaust port at the upper end of the test tank 13 is connected to the upper port of the liquid level measuring plexiglass tube 10, the liquid level height measurement of the pressurized storage tank can be realized. In this embodiment, an exhaust port is provided on the top of the test tank 13 to communicate with the atmosphere, and the upper port of the liquid level measuring plexiglass tube 10 is kept communicated with the atmosphere.

The first branch pipeline is connected to the filling and draining unit 5 and the bottom of the test tank 13 for filling and draining the propellant simulant, including the first pipeline 14, the second pipeline 15, the first pipeline Stop valve 19 and first clamp; wherein, the filling and draining system unit 5 is connected with the first pipeline 14, the bottom of the test tank 13 is connected with the second pipeline 15, and the first pipeline 14 is connected with the second pipeline A first cut-off valve 19 is installed between 15 , and a first clamp is installed at the connecting end of the first cut-off valve 19 and the first pipeline 14 . The first cut-off valve 19 is used to control the filling amount of the simulated liquid. After reaching the specified liquid level, the first cut-off valve 19 is closed to keep the liquid level in the test tank 13 unchanged. The first clamp enables quick disassembly and assembly of the first pipeline 14 and the test tank 13, which not only improves the efficiency of state conversion, but also reduces the adverse effect of the additional pipeline on the shaking test results.

The second branch pipeline is connected to the bottom end of the test tank 13 and the communication pipeline, including the third pipeline 16, the second stop valve 20 and the second clamp; wherein, the third pipeline 16 is connected to The lowest end of the test tank 13 and the second stop valve 20, the second clamp is installed at the connection end of the second stop valve 20 and the fourth pipeline 17 of the communication pipeline, so that the connection between the pipeline and the test tank 13 is connected. Realize quick disassembly. In the tank liquid sloshing test, the second branch pipeline is connected with the test tank 13 and shakes together, and the connecting pipeline connected with the liquid level measuring plexiglass tube 10 is separated from the test tank 13 and does not participate in the test process of the tank shaking. , to minimize the influence of the additional mass on the parameters of the sway dynamics test.

The communication pipeline is connected with the second branch pipeline and the liquid level measuring plexiglass tube 10, including the fourth pipeline 17, the third stop valve 21 and the fifth pipeline 18; wherein, the fourth pipeline 17 is connected to The second stop valve 20 and the fifth pipeline 18 of the second branch pipeline are connected to the lower port of the liquid level measuring plexiglass tube 10 , and the third stop valve 21 is installed between the fourth pipeline 17 and the fifth pipeline 18 . Both the second cut-off valve 20 and the third cut-off valve 21 can be opened and closed independently, so as to realize the connection and cut-off function of the communication pipeline.

The method for measuring the liquid level of a sloshing test tank according to the present invention includes the following steps:

Step 1, before the start of the tank shaking test, connect the test device according to FIG. 2; open the second stop valve 20 and the third stop valve 21, so that the test tank 13 is communicated with the liquid level measuring plexiglass tube 10;

Step 2, open the filling and discharging unit 5 to fill the propellant simulation liquid, open the first shut-off valve 19, and close the first shut-off valve 19 when the liquid in the second branch pipeline is full and just reaches the bottom position of the test tank 13. It is the zero position at the bottom of the box. Read the actual height of the liquid level when the liquid level measurement plexiglass tube 10 is at the zero position, and record;

Step 3, obtain the relative height of the liquid level from the bottom of the tank according to the test requirements, and then calculate the actual height of the target with reference to the zero position of the bottom of the tank, which is used for filling of each liquid level;

Step 4, add measurement:

Step 4.1, when performing the liquid level measurement, keep the second stop valve 20 and the third stop valve 21 open to ensure that the exhaust port of the test tank 13 and the upper end nozzle of the plexiglass tube 10 for liquid level measurement are both in phase with the atmosphere;

Step 4.2, open the filling and discharging unit 5 and open the first shut-off valve 19, fill the propellant simulation liquid into the test tank 13, and observe the test tank 13 and the liquid level measurement plexiglass tube 10 in real time through the video monitoring unit 3. changes in the liquid level;

Step 4.3, when the height of the liquid level is close to the specified scale, control the first shut-off valve 19 to slow down the filling flow and perform accurate filling;

Step 4.4, when the liquid level reaches the target actual height, close the first stop valve 19 to stop filling, keep the liquid level stable and mark the height of the liquid level;

Step 5, close the second stop valve 20 and the third stop valve 21 to prevent the liquid in the test tank 13 and the liquid level measuring plexiglass tube 10 from flowing out, remove the first clamp and the second clamp, and put the first pipe 14 is separated from the test tank 13, and the communication pipeline is separated from the second branch pipeline, so as to avoid the influence of the quality of the additional pipeline on the results of the shaking test data;

Step 6, start the shaking unit 1 during the formal test, ensure that the test meets the test conditions by controlling the acquisition unit 2, and collect the shaking test data parameters; after the formal test is completed, the test tank 13 is again respectively connected with the first pipeline 14 and the connecting pipe. The circuit is connected, and the filling and draining unit 5 is turned on to discharge the propellant simulated liquid, and the process from step 1 to step 6 is repeated to complete the measurement of the next liquid level state.

The embodiments of the present invention have been described in detail above, and the above-mentioned embodiments are only the best embodiments of the present invention, but the present invention is not limited to the above-mentioned embodiments. Various changes can be made without departing from the spirit of the present invention.

Claims (5)

1. a shaking test tank liquid level measurement system, is characterized in that: The shaking test tank is composed of six functional units, namely: shaking unit (1), control and acquisition unit (2), video monitoring unit (3), test tank unit (4), filling and draining unit (5) ), the liquid level measurement unit (6); the control acquisition unit (2) controls the shaking unit (1) to generate a shaking force that meets the test conditions, and collects the actual shaking test data parameters of the shaking unit (1), and the shaking unit (1) makes The test tank unit (4) produces corresponding shaking, the filling and draining unit (5) fills or drains the simulated propellant liquid for the test tank unit (4), and the liquid level measuring unit (6) is used to accurately measure the test tank The liquid level height in the unit (4), and the video monitoring unit (3) is used to observe the liquid level height change in the test tank unit (4) and the liquid level measurement unit (6) in real time; The test tank unit (4) is composed of a test tank (13), a liquid management device (7), and an anti-slosh device. The liquid management device (7) is arranged at the bottom of the test tank to control liquid sloshing. The anti-slosh device is provided It is used in the vicinity of the liquid level height where large sloshing is most likely to occur in the test tank to reduce the liquid level sloshing; The system further comprises a liquid level measuring plexiglass tube (10) with a fixed scale (11), a first branch pipeline, a second branch pipeline and a communication pipeline; The exhaust port at the upper end of the test tank (13) is communicated with the upper port of the liquid level measuring plexiglass tube (10) or both are communicated with the atmosphere; The first branch pipeline comprises a first pipeline (14), a second pipeline (15), and a first shut-off valve (19), and the filling and draining system unit (5) is connected with the first pipeline (14), The bottom of the test tank (13) is connected with the second pipeline (15), and a first shut-off valve (19) is installed between the first pipeline (15) and the second pipeline (15); The second branch pipeline includes a third pipeline (16) and a second shut-off valve (20), and the third pipeline (16) is connected to the bottommost end of the test tank (13) and the second shut-off valve (20). ); The communication pipeline includes a fourth pipeline (17), a third stop valve (21), and a fifth pipeline (18), and the fourth pipeline (17) is connected to the second stop valve ( 20), the fifth pipeline (18) is connected to the lower port of the liquid level measuring plexiglass tube (10), and the third stop valve (21) is installed between the fourth pipeline (17) and the fifth pipeline (18) . 2. A liquid level measurement system for a sloshing test tank according to claim 1, further comprising a first clamp and a second clamp, the first clamp is installed on the first stop valve (19) and the first clamp. At the connection end of the pipeline (14), the second clamp is installed at the connection end of the second stop valve (20) and the fourth pipeline (17) of the communication pipeline. 3. according to a kind of shaking test storage tank liquid level measurement system according to claim 1, the video monitoring unit (3) is made up of the test storage tank monitoring device (22) and the liquid level measurement plexiglass tube monitoring device (23), and the test The tank monitoring device (22) and the liquid level measuring plexiglass tube monitoring device (23) are monitored synchronously in time. 4. A liquid level measurement system for a sloshing test tank according to claim 1, further comprising a lower end fixing device (12), an upper end fixing device (9), and a dust cover (8), which are respectively installed at the liquid level Measure the lower end, upper end and upper port of the plexiglass tube (10). 5. according to a kind of shaking test storage tank liquid level measuring system according to claim 3, its measuring method comprises the following steps: Step 1, open the second shut-off valve (20) and the third shut-off valve (21); Step 2, open the filling and discharging unit (5) to fill the simulated propellant liquid, open the first shut-off valve (19), and close the first stop valve (19) when the liquid in the second branch pipeline is full and just reaches the bottom position of the test tank (13). A stop valve (19), recorded as the zero position at the bottom of the box, read the actual height of the liquid level when the liquid level measurement plexiglass tube (10) is at the zero position, and record it; Step 3: Obtain the relative height of the liquid level from the bottom of the tank according to the test requirements, and then calculate the actual height of the target with reference to the zero position of the bottom of the tank; Step 4, add measurement; Step 4.1, keep the second shut-off valve (20) and the third shut-off valve (21) open to ensure that the exhaust port at the upper end of the test tank (13) and the upper port of the liquid level measuring plexiglass tube (10) are connected to the atmosphere ; Step 4.2, open the filling and discharging unit (5) and open the first shut-off valve (19), fill the propellant simulation liquid into the test tank (13), and pass the test tank monitoring device (22) and liquid level measurement at the same time The plexiglass tube monitoring device (23) observes the change of the liquid level of the test tank (13) and the liquid level measuring plexiglass tube (10); Step 4.3, when the height of the liquid level is close to the specified scale, control the first shut-off valve (19) to slow down the filling flow and perform precise filling; Step 4.4, when the liquid level reaches the target actual height, close the first stop valve (19) to stop filling, keep the liquid level stable and mark the height of the liquid level; Step 5, close the second stop valve (20) and the third stop valve (21), remove the first clamp, the second clamp and their accompanying pipelines; Step 6, carry out the tank shaking test; after the test is completed, connect the test tank (13) to the first pipeline (14) and the communication pipeline respectively, and open the filling and discharging unit (5) to discharge the propellant simulant liquid. , repeat the process from step 1 to step 6 to complete the measurement of the next liquid level state.

Images