A test method for verifying the reliability of an unmanned aerial vehicle (UAV) wave measurement system

Abstract

This invention discloses a test method for verifying the reliability of an unmanned aerial vehicle (UAV) wave measurement system, comprising a water tank and a wind-generating system, a wave simulation system, and a test environment parameter acquisition system disposed within the water tank. The wind-generating system provides an adjustable wind field for the UAV equipped with the wave measurement system to simulate offshore wind conditions. The wave simulation system simulates various wave conditions required for UAV wave measurement. The test environment parameter acquisition system collects wind speed data and true wave data below the UAV test area. During UAV wave data measurement, the test environment parameter acquisition system synchronously records the wind speed data and true wave data below the test area. After the test, the wave measurement data and true wave data of the UAV are compared and analyzed to calculate the measurement error, thereby evaluating the measurement reliability of the UAV wave measurement system under different operating conditions.

Description

Technical Field

[0001] This invention relates to the field of marine engineering testing technology, and in particular to a test method for verifying the reliability of an unmanned aerial vehicle (UAV) wave measurement system. Background Technology

[0002] Unmanned aerial vehicles (UAVs) equipped with wave measurement systems serve as mobile marine wave observation stations, offering advantages such as high mobility, low risk, and low cost, and are gradually becoming the preferred equipment for short-term marine wave observation. However, due to the harsh offshore environment, the stability of UAVs is highly susceptible to the influence of wind and waves, thus requiring thorough verification of the reliability and measurement accuracy of UAV wave measurement systems. Traditional marine field tests are costly, time-consuming, and greatly affected by uncontrollable factors such as weather and sea conditions, making it difficult to systematically obtain comparative data under different operating conditions. Therefore, there is an urgent need for an experimental scheme that can simulate the offshore wind and wave environment in a laboratory and systematically and repeatedly verify the UAV wave measurement system. Summary of the Invention

[0003] The purpose of this application is to address the technical deficiencies in existing technologies by providing a test method for verifying the reliability of an unmanned aerial vehicle (UAV) wave measurement system. This method can safely, economically, and controllably simulate marine operating conditions and simultaneously acquire standard wave data and UAV-measured wave data to quantitatively verify the reliability of the UAV wave measurement system.

[0004] The technical solution adopted to achieve the purpose of this application is: This invention provides a test method for verifying the reliability of a UAV wave measurement system, comprising: a water tank and a wind generation system, a wave simulation system, and a test environment parameter acquisition system disposed in the water tank; the test method includes the following steps: Step 1: Activate the wind generation system to generate wind speed in the UAV test area to simulate offshore wind field conditions; at the same time, activate the wave simulation system to generate waves in the water tank to simulate offshore wave conditions. Step 2: Take off the drone equipped with the wave measurement system and hover it at a preset height in the drone test area; then start the drone's wave measurement system to begin recording wave measurement data; Step 3: During the wave data measurement by the UAV, the wind speed data of the UAV test area and the true wave data below the UAV test area are recorded synchronously through the test environment parameter acquisition system. Step 4: After the experiment, compare and analyze the wave measurement data of the UAV with the true wave data, and calculate the measurement error; Step 5: By changing the wind field and wave simulation conditions, repeat steps 1-4 above to evaluate the measurement reliability of the UAV wave measurement system under different operating conditions.

[0005] In the above technical solution, the air generation system includes an axial flow fan, a support frame, and a wind speed control system. The axial flow fan is installed on top of the support frame, which supports the axial flow fan to a specified height. The wind speed control system controls the motor speed of the axial flow fan through a frequency converter to control the wind speed.

[0006] In the above technical solution, an arc-shaped track is also provided on the top of the support frame, and the axial flow fan is installed on the arc-shaped track through a walking mechanism. During the test, the UAV hovers in the center area of ​​the arc-shaped track, which serves as the test area for the UAV. The walking control system controls the walking position of the axial flow fan on the arc-shaped track to adjust the wind direction of the UAV test area.

[0007] In the above technical solution, the axial flow fan is positioned at different points on the arc track by the arc track, so as to blow air in different wind directions in the test area of ​​the UAV; or, while the axial flow fan moves along the arc track, the axial flow fan blows air and adjusts the wind force at the same time to simulate the dynamic changes in wind direction and wind speed.

[0008] In the above technical solution, the wave simulation system is a wave generator installed in a water tank. The wave generator generates waves in the water tank, which are then used by a drone equipped with a wave measurement system for measurement.

[0009] In the above technical solution, wave-damping devices are installed at both ends of the water tank to reduce reflected waves.

[0010] In the above technical solution, the test environment parameter acquisition system includes: a digital anemometer and an immersion digital wave altimeter. The digital anemometer is placed in the UAV test area to measure the wind speed data generated by the wind-generating system in the UAV test area; the immersion digital wave altimeter is placed in the water tank below the UAV test area to measure the true wave data.

[0011] The beneficial effects of this invention are as follows: Safe and controllable: Transforming high-risk offshore field tests into controllable tests in the laboratory avoids the direct threat to personnel and equipment from severe sea conditions.

[0012] Low cost and repeatable: Compared with sea trials, it significantly reduces costs and time, and can accurately reproduce test conditions, making it easy to conduct multiple repeatability verifications and parameter sensitivity analyses.

[0013] Comprehensive system verification: It can not only verify the accuracy of the wave measurement system, but also simultaneously assess the flight stability, wind resistance and hovering accuracy of the UAV in a simulated wind field, realizing the overall performance evaluation of the "UAV-Wave Measurement System" integrated platform.

[0014] Data reliability: The reliability of the verification and comparison data is ensured by using a high-precision immersion digital wave height meter as a benchmark. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the test platform for verifying the reliability of the UAV wave measurement system of the present invention.

[0017] Figure 2 This is a schematic diagram of the axial flow fan in this invention installed on an arc-shaped track. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0019] This embodiment provides an experimental method for verifying the reliability of a UAV wave measurement system. See Appendix. Figure 1 The test platform used in this test method includes: a water tank 1 and a wind generation system, a wave simulation system and a test environment parameter acquisition system set in the water tank 1.

[0020] 1. The aforementioned wind-generating system: This system provides an adjustable wind field for the UAV 5 equipped with a wave measurement system to simulate offshore wind conditions. Specifically, the wind-generating system includes an axial flow fan 11, a support frame 12, and a wind speed control system. The axial flow fan 11 provides the wind field for the UAV 5. Since the UAV 5 needs to hover at a specified height to measure wave data, the axial flow fan 11 is mounted on top of the support frame 12. The support frame 12 supports the axial flow fan 11 to a sufficient specified height, placing the UAV 5 within the wind field. The wind speed control system controls the motor speed of the axial flow fan 11 via a frequency converter to control the wind speed. Before the test, the frequency of the frequency converter needs to be adjusted in conjunction with an anemometer to calibrate the wind speed.

[0021] For further details, please see the appendix. Figure 2The top of the support frame 12 is also equipped with an arc-shaped track 13. The axial flow fan 11 is mounted on the arc-shaped track 13 via a walking mechanism and can move along the arc-shaped track 13. Preferably, the arc-shaped track 13 is a double-track arc-shaped track (i.e., it includes two parallel arc-shaped tracks) to enhance the stability of the axial flow fan 11. During the test, the UAV 5 hovers in the center area of ​​the arc-shaped track 13. This area serves as the test area for the UAV 5. The walking control system (also known as the wind direction control system) controls the walking position of the axial flow fan 11 on the arc-shaped track 13, thereby adjusting the wind direction of the UAV test area. Furthermore, the walking mechanism is also equipped with a position locking (i.e., braking) function, so that the axial flow fan 11 can lock in the target position after it has moved to that position.

[0022] Through the aforementioned arc track 13 and walking control system, it is possible not only to simulate the working conditions of specified wind direction (i.e., to place the axial flow fan 11 at different points on the arc track 13 to blow air in different wind directions in the test area of ​​the UAV), but also to simulate the working conditions of dynamically changing wind direction and wind speed (i.e., while the axial flow fan 11 moves along the arc track 13, the axial flow fan 11 blows air and adjusts the wind force at the same time to simulate the working conditions of dynamically changing wind direction and wind speed).

[0023] II. The wave simulation system: used to simulate various wave conditions required for wave measurement by the UAV 5. Specifically, the wave simulation system consists of a wave generator 21 installed in a water tank. When the water level in the tank is at a certain level, the wave generator 21 generates regular and irregular waves in the tank, which are then used by the UAV 5 equipped with the wave measurement system to measure wave height, period, and other elements.

[0024] Furthermore, preferably, the water tank 1 is a large-scale experimental water tank with dimensions of 98m x 4m x 1.8m. Wave-damping devices 22 are installed at both ends of the water tank to reduce reflected waves.

[0025] 3. The test environment parameter acquisition system is used to collect wind speed data and true wave data below the UAV test area.

[0026] The test environment parameter acquisition system includes a digital anemometer and an immersion digital wave altimeter 4. The digital anemometer is located in the UAV test area (near the hovering position of UAV 5) to measure the actual wind speed data of the wind field generated by the wind-generating system in the UAV test area. The immersion digital wave altimeter 4 is located in the water tank below the UAV test area to measure the true value data such as wave height and period of waves with high precision, which serves as the "benchmark true value" for subsequent comparative analysis with the wave measurement data of UAV 5.

[0027] The experimental method for the UAV wave measurement system based on the above-mentioned experimental platform is as follows.

[0028] Step 1: Activate the wind generation system to generate wind speed in the test area to simulate offshore wind field conditions; at the same time, activate the wave simulation system to generate waves in the water tank to simulate offshore wave conditions.

[0029] Step 2: Take off the drone 5 equipped with the wave measurement system and hover it at a preset height in the test area (e.g., 3m above the water surface of the tank); then start the drone's wave measurement system to record wave measurement data.

[0030] Step 3: During the wave data measurement by the UAV, the true wave data measured by the immersion digital wave altimeter 4 and the actual wind speed data of the wind field measured by the digital anemometer are recorded synchronously through the test environment parameter acquisition system.

[0031] Step 4: After the experiment, compare and analyze the wave measurement data of the UAV with the true wave data, and calculate the measurement error.

[0032] Step 5: By changing the wind field and wave simulation conditions, repeat steps 1-4 above to evaluate the measurement reliability of the UAV wave measurement system under different operating conditions.

[0033] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A test method for verifying the reliability of a UAV wave measurement system, characterized in that, include: The water tank and the air generation system, wave simulation system and test environment parameter acquisition system installed in the water tank; The test method includes the following steps: Step 1: Activate the wind generation system to generate wind speed in the UAV test area to simulate offshore wind field conditions; at the same time, activate the wave simulation system to generate waves in the water tank to simulate offshore wave conditions. Step 2: Take off the drone equipped with the wave measurement system and hover it at a preset height in the drone test area; then start the drone's wave measurement system to begin recording wave measurement data; Step 3: During the wave data measurement by the UAV, the wind speed data of the UAV test area and the true wave data below the UAV test area are recorded synchronously through the test environment parameter acquisition system. Step 4: After the experiment, compare and analyze the wave measurement data of the UAV with the true wave data, and calculate the measurement error; Step 5: By changing the wind field and wave simulation conditions, repeat steps 1-4 above to evaluate the measurement reliability of the UAV wave measurement system under different operating conditions.

2. The test method for verifying the reliability of an unmanned aerial vehicle (UAV) wave measurement system according to claim 1, characterized in that, The air generation system includes an axial flow fan, a support frame, and a wind speed control system. The axial flow fan is installed on top of the support frame, which supports the axial flow fan to a specified height. The wind speed control system controls the motor speed of the axial flow fan through a frequency converter to control the wind speed.

3. The test method for verifying the reliability of an unmanned aerial vehicle (UAV) wave measurement system according to claim 2, characterized in that, An arc-shaped track is also provided at the top of the support frame, and the axial flow fan is installed on the arc-shaped track through a walking mechanism. During the test, the UAV hovers in the center area of ​​the arc-shaped track, which serves as the test area for the UAV. The walking control system controls the walking position of the axial flow fan on the arc-shaped track to adjust the wind direction of the UAV test area.

4. The test method for verifying the reliability of an unmanned aerial vehicle (UAV) wave measurement system according to claim 3, characterized in that, By using an arc-shaped track and a walking control system, the axial flow fan can be positioned at different points on the arc-shaped track to blow air in different wind directions in the UAV test area; or, while the axial flow fan is moving along the arc-shaped track, it can simultaneously blow air and adjust the wind force to simulate dynamically changing wind direction and wind speed conditions.

5. The test method for verifying the reliability of an unmanned aerial vehicle (UAV) wave measurement system according to claim 1, characterized in that, The wave simulation system consists of a wave generator installed in a water tank. The wave generator produces waves in the water tank, which are then measured by a drone equipped with a wave measurement system.

6. The test method for verifying the reliability of an unmanned aerial vehicle (UAV) wave measurement system according to claim 1, characterized in that, Wave-damping devices are installed at both ends of the water tank to reduce reflected waves.

7. The test method for verifying the reliability of an unmanned aerial vehicle (UAV) wave measurement system according to claim 1, characterized in that, The test environment parameter acquisition system includes a digital anemometer and an immersion digital wave altimeter. The digital anemometer is located in the UAV test area to measure the wind speed data generated by the wind-generating system in the UAV test area. The immersion digital wave altimeter is located in the water tank below the UAV test area to measure the true wave data.

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