A self-calibrated water depth-current-wave test tank device and test method

Abstract

The present invention discloses a water tank device and test method for self-calibration of water depth, water flow and waves. The device mainly includes a water tank, a water pump, a lifting platform and a wave maker. The method is as follows: obtaining the initial water depth and water flow velocity in the water tank, measuring the water depth from the water surface to the upper end surface of the lifting platform, and adjusting the height of the lifting platform so that the measured water depth reaches the water depth required for the test; measuring the water flow velocity after the lifting platform is adjusted, and adjusting the flow rate of the water pump until the measured water flow velocity reaches the water flow velocity required for the test; the control system performs primary and secondary corrections on the wave-making control signal based on the water flow velocity, obtains wave period parameters and wave height parameters, and completes the automatic calibration of water depth, water flow and waves. The present invention solves the problems of low test efficiency, easy errors in water depth and water flow, and deviation caused by wave height deformation caused by the influence of water flow in traditional wave and flow tank tests. It improves the automation level, efficiency and accuracy of the test.

Claims

1. A self-calibrated depth-current-wave test method, characterized in that: The following steps are involved: Step 1, fill the water tank (1) with water to the required depth for the test; Step 2, the control system controls the number of water pumps (2) turned on according to the water depth and water flow rate required for the input test; Step 3, using the monitoring mechanism (6) to measure the water depth from the water surface to the upper end surface of the lifting platform (5), transmitting the measured data to the control system, and adjusting the height of the lifting platform (5) so that the measured water depth reaches the water depth required for the test, the lifting platform (5) includes a slope (51) and a platform (52), the slope (51) is located on a side close to the wave maker (4), and the platform (52) is located on a side away from the wave maker (4), the slope of the slope (51) ranges from 1:100 to 1:5, and the top of the slope (51) is flush with the table surface of the platform (52); Step 4, using the monitoring mechanism (6) to measure the water flow velocity of the lifting platform (5) after adjustment, transmitting the measured data to the control system, and adjusting the flow rate of the water pump (2) until the measured water flow velocity reaches the water flow velocity required for the test; Step 5: Input the wave data parameters required for the test into the control system. The control system corrects the wave control signal based on the water flow velocity to obtain the corrected wave parameters. Step 6: Perform a secondary correction on the wave control signal. The control system determines the wave parameters after the primary correction, determines the required slope, and adjusts the slope, including the following: ， At that time, the slope m of the lifting platform (5) was 1:20, and a secondary correction was made according to the slope, as shown in the following formula: In the above formula, It represents the wave height parameter input into the control system after one correction when waves and currents act together. represents the slope correction coefficient, represents the deep water wavelength under no-current conditions, Indicates the water depth required for the test, represents the wavelength at the lifting platform under no water flow conditions, It represents the wave height parameter input into the control system after secondary correction when waves and currents act together; when When combined with the slope correction coefficient , adjust the slope m, the value of the slope m is determined by the wave breaking parameter Sure; Collect the wave height required under different test conditions , the wave period required for the test And the water depth required for the test , the fragmentation parameters are obtained by fitting The calculation formula is: when When the slope m is reduced, When , the current slope m is used to complete the slope adjustment; In step 7, the control system inputs the wave period parameter corrected once and the wave height parameter corrected twice into the wave maker (4), completing the automatic calibration of water depth-current-wave.

2. A self-calibrated depth-current-wave test method according to claim 1, characterized in that: In step 1, the water tank (1) is filled with water to the required water depth for the test under the working condition that there is no water flow and no waves in the water tank (1). The required water depth for the test refers to the water depth from the water surface to the upper end surface of the lifting platform (5).

3. A self-calibrated depth-current-wave test method according to claim 1, characterized in that: In step 2, the control system controls the number of water pumps (2) opened according to the water depth and water flow rate required for the input test. The water flow rate is the vertical average flow rate measured by the monitoring mechanism (6). Determine the number of pumps (2) that are turned on, is the width of the tank, Indicates the water flow velocity, Indicates the water depth required for the test.

4. A self-calibrated depth-current-wave test method according to claim 1, characterized in that: In step 3, after the water flow in the water tank (1) becomes stable, the water depth from the water surface to the upper end surface of the lifting platform (5) is measured using the water level gauge of the monitoring mechanism (6), and the measurement data is transmitted to the control system. If the measured actual water depth is less than the water depth required for the test, the height of the lifting platform (5) is lowered. If the measured actual water depth is greater than the water depth required for the test, the height of the lifting platform (5) is raised so that the measured water depth reaches the water depth required for the test.

5. The self-calibrated depth-current-wave test method according to claim 1, characterized in that: In step 5, the data parameters of the waves required for the test are input into the control system. The control system uses the following formula to correct the wave control signal in combination with the water flow velocity: In the above formula, represents the wave height required for the test, represents the wave period required for the test, It represents the wave height parameter input into the control system after one correction when waves and currents act together. It represents the wave period parameter input into the control system after one correction when waves and currents act together. represents the relative wave velocity parameter, represents the wave velocity under no-flow conditions, Indicates the water depth required for the test, represents the wavelength at the lifting platform under no water flow conditions, Represents the acceleration due to gravity.

6. A test flume device used in the self-calibrated depth-current-wave test method according to claim 1, characterized in that: The invention comprises a water tank (1), a water pump (2) and a wave maker (4), wherein the water tank (1) is provided with a water pump (2) at one end, a water inlet and outlet (3) is provided at the other end, the wave maker (4) is provided on a side of the water inlet and outlet (3) away from the middle of the water tank (1), a lifting platform (5) is provided in the middle of the water tank (1), a hydraulic rod for adjusting the lifting is provided at the lower part of the lifting platform (5), and the lifting platform (5) comprises a slope (51) and a platform (52), wherein the slope (51) is a hypotenuse triangle. The platform (52) is a rectangular parallelepiped structure located on a side close to the wave maker (4). The slope (51) has a slope ranging from 1:100 to 1:

5. The top of the slope (51) is flush with the surface of the platform (52). A monitoring mechanism (6) is provided at the junction of the slope (51) and the platform (52). The monitoring mechanism (6) includes a water level meter, a current meter, and a wave height meter. The monitoring mechanism (6) establishes a data transmission connection with the control system.

7. The test water tank device according to claim 6, characterized in that: Wave-breaking slopes (7) for breaking waves are provided at the front and rear ends of the water trough (1). The wave maker (4) is a push-plate wave maker. The width of the wave maker (4) is consistent with the width of the water trough (1). The height of the wave maker does not exceed three-quarters of the height of the water trough (1).

8. The test water tank device according to claim 6, characterized in that: The water pumps (2) are bidirectional water pumps, and a plurality of them are arranged side by side along the width direction of the water tank (1). One end of the water pumps (2) is connected to the tank of the water tank (1), and the other end is connected to the reservoir (8) containing test water. The water inlet and outlet (3) are connected to the reservoir (8).

9. The test water tank device according to claim 6, characterized in that: The length of the lifting platform (5) is one fifth of the length of the water trough (1), and the width of the lifting platform (5) is consistent with the inner width of the water trough (1).

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