A gravity wave generator and method of operation

Abstract

A gravity wave generating device and working method, including controller, drain tank, test water tank and water collecting tank, one side of the drain tank is provided with the water tank, the bottom of the water tank is provided with the lifting platform, the overflow baffle is vertically arranged in the water tank, the overflow baffle separates the water tank into overflow tank and backflow tank, and the overflow pipe is connected between the overflow tank and the drain tank; the working water level can be accurately controlled, and the continuity and stability of the generated wave are ensured.

Description

Technical Field

[0001] This invention relates to a gravity-based wave generator and its operating method. Background Technology

[0002] The environmental adaptability of marine equipment, marine engineering equipment, underwater equipment, and even defense weapons in the ocean is an important indicator for modern evaluation of whether marine equipment can fully utilize its performance and improve its overall performance. Currently, the performance testing of marine equipment is mainly carried out using scaled-down model tests in sea state simulation test fields. The core equipment of the test field is the wave-making device, mainly using wave pushers and wave-making balls.

[0003] To accelerate the construction of a maritime power, marine equipment is rapidly developing towards the deep-sea and open-ocean fields, leading to more stringent performance requirements and placing higher demands on the testing capabilities of sea state simulation test sites. Sea state simulation test sites need to simulate waves in the marine environment, and in high sea states, wave heights can often reach several meters. Traditional wave-generating equipment generates waves by mechanically propelling water, but due to limitations in power equipment, it cannot generate large-area high-sea-state waves.

[0004] Gravity wave generation technology uses gates to control the periodic release of water, converting gravitational potential energy into wave energy to generate waves. Since it requires no large external mechanical force, it can produce relatively large waves. Currently, this technology can generate waves up to 3 meters high and is widely used in water recreation areas. However, gravity wave generation equipment consumes a large amount of water during wave generation, causes a significant drop in the operating water level, and suffers from poor wave continuity and stability, making it difficult to apply in the field of marine equipment testing. Summary of the Invention

[0005] To address the above-mentioned technical shortcomings, this invention provides a gravity-based wave generator and its operating method, which can precisely control the working water level and ensure the continuity and stability of the generated waves.

[0006] This invention is achieved through the following measures:

[0007] A gravity-type wave generator includes a controller, a drain tank, a test tank, and a collection tank. A regulating tank is located on one side of the drain tank, and a lifting platform is located at the bottom of the regulating tank. An overflow baffle is vertically installed inside the regulating tank, dividing it into an overflow tank and a return tank. An overflow pipe connects the overflow tank and the drain tank, and a return pipe connects the return tank and the collection tank. A water supply pipe connects the drain tank and the collection tank. The test tank is located between the drain tank and the collection tank. The bottom of the drain tank is connected to the bottom of one end of the test tank and a control gate is installed thereon. A wave-damping net and a wave meter are installed inside the test tank. The other end of the tank is connected to the upper part of the collection tank; the control gate includes a gate housing fixed at both ends to the drain tank and the test tank respectively, and a water passage connected to the drain tank and the test tank is provided inside the gate housing. A motor is provided on the top of the gate housing, and several blades that can rotate axially and adjust the opening of the water passage by rotating are driven and connected below the motor; an overflow valve is provided on the overflow pipe, a centrifugal pump, a check valve, a water supply valve, and an electromagnetic flow meter are provided on the water supply pipe, and a return valve is provided on the return water pipe. The electromagnetic flow meter and wave height meter are connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the centrifugal pump and the motor.

[0008] The aforementioned water supply pipeline is equipped with a T-joint. Two of the joints of the T-joint are connected to the water supply pipeline and the outlet of the centrifugal pump, respectively. The other joint of the T-joint is connected to a flow regulating pipeline. The end of the flow regulating pipeline is connected to a water collection tank. The inlet of the centrifugal pump is connected to the water collection tank through a pipeline. A flow regulating valve is installed on the flow regulating pipeline.

[0009] The aforementioned drain tank is equipped with a selection plate, and the bottom of the test tank is equipped with an adjustable height tank support platform. The gate housing of the control gate is equipped with gate frames at both ends, with one gate frame fixed on the selection plate and the other gate frame fixed on the collection tank. A reducer and a coupling are connected below the motor. The motor drives several horizontally arranged and meshing gears through the reducer and coupling. The top of a blade is connected to the center of a gear through a bearing, and the bottom of the blade is rotatably connected to the bottom of the gate housing through a bearing.

[0010] The test tank is equipped with wave-damping nets at intervals. A guide channel extends outward from the top of the end of the test tank and is located above the water collection tank. The top of the water collection tank is open. A wave-damping slope is provided between the guide channel and the bottom of the test tank. The wave-damping slope includes two supporting inclined plates. Several strip plates are detachably connected horizontally between the two supporting inclined plates.

[0011] The aforementioned drain tank is equipped with a pressure regulating pipe. One end of the pressure regulating pipe extends from the top of the drain tank into the drain tank, and the other end extends into the gate housing.

[0012] The overflow pipe in the aforementioned drain tank is equipped with a rectifier screen. The drain tank is equipped with a drain tank inlet and a drain tank outlet. The collection tank is equipped with a collection tank inlet and a collection tank outlet. The drain tank is equipped with a maintenance gate.

[0013] A method for operating a gravity-based wave generator includes the following steps:

[0014] Step 1: Replace the selected plate and control gate according to wave requirements, adjust the number of strip plates on the wave-dissipating slope, and adjust the height of the adjusting water tank by adjusting the height of the lifting platform. The water level in the discharge tank is adjusted by the height of the overflow baffle in the adjusting water tank. The formula for calculating the lifting height of the lifting platform is:

[0015] h s =h w -h d (1)

[0016] Among them, h s h is the height at which the lifting platform is raised. w The designated water level in the drain tank; h d To adjust the height of the overflow baffle of the water tank.

[0017] Step 2: Adjust the water level of the drain tank and the collection tank by adjusting the water inlet and outlet of the drain tank and the water inlet and outlet of the collection tank. Adjust the water level of the drain tank to be level with the top of the overflow baffle and adjust the collection tank to three-quarters of its height so that the inlet of the centrifugal pump is lower than the water surface of the collection tank. Fill the test water tank with water until the water level is level with the height of the wave-dissipating slope.

[0018] Step 3: Based on the opening shape of the selected plate and the water level difference between the drain tank and the test tank, calculate the discharge flow rate of the drain tank using the orifice outflow calculation formula in hydraulics, as follows:

[0019]

[0020] Where Q is the discharge flow rate; μ is the flow coefficient; A is the area of ​​the opening of the selected plate; and H0 is the water level difference between the discharge tank and the test tank.

[0021] Step 4: Turn on the centrifugal pump and adjust the flow rate into the drain tank by changing the opening of the flow regulating valve. Observe the measured value of the electromagnetic flow meter until the measured value is equal to the discharge flow rate Q in Step 3.

[0022] Step 5: Open the control gate and the maintenance gate. Observe the change in water level in the drain tank through the level gauge and adjust the opening of the flow regulating valve to keep the water level in the drain tank stable.

[0023] Step 6: The controller controls the motor's rotation speed, angle, and time interval, thereby controlling the gate's opening and closing speed and time interval. Water continuously drains from the spillway tank, generating continuous waves. During the test, the centrifugal pump remains on. When the gate is open, the pumping flow entering the spillway tank is discharged through the gate. If the pumping flow exceeds the discharge flow, the excess flow is discharged through the regulating tank to maintain a stable water level. When the gate is closed, the pumping flow entering the spillway tank is discharged through the regulating tank, maintaining a stable water level. If the water level in the spillway tank changes significantly during wave generation, it is adjusted using the flow regulating valve.

[0024] Step 7: After the waves stabilize, place the marine equipment into the test tank and conduct performance tests on the scaled-down model of the marine equipment. After the test, close the maintenance gate, overflow valve, return water valve, centrifugal pump, flow regulating valve, and control gate in sequence.

[0025] The beneficial effects of the present invention are: (1) The present invention can accurately control the water level of the drain tank. In the test process, the present invention uses a large flow centrifugal pump to continuously inject water into the drain tank, and accurately controls the water level in the drain tank through a two-stage water level adjustment system. First, the flow rate of the drain tank is adjusted by the flow regulating pipe and the flow regulating valve, and then the water level of the drain tank is accurately controlled by the adjustment tank and the return pipe. The water level of the drain tank in the present invention is the same as the top elevation of the overflow baffle, and can be adjusted by the lifting platform. (2) The present invention can accurately control the wave parameters. The control gate used in the present invention is a louvered gate, which can realize the rapid opening and closing of the gate. The opening and closing speed and opening degree of the gate can be accurately controlled by the PLC-controlled stepper motor. The louvered blades used in the present invention are small in size, and will not cause great interference to the flow field during the opening and closing process. (3) The present invention makes it convenient to replace the control gate and test water tank according to the test requirements. The selected plate and the drain tank and the control gate, the maintenance gate and the drain tank are all connected by flanges. The height of the water tank support platform is adjustable, and the bottom is a lifting screw, which facilitates the leveling and lifting of the test water tank. At the same time, during the replacement of each structure, the drain channel of the drain tank can be completely cut off, without having to empty the water in the drain tank, thus avoiding the waste of water resources and saving test time. (4) In the test process, the water flow can be circulated in the water tank system through the pipeline system, thus avoiding the waste of water resources. The centrifugal pump pumping flow comes from the water collection tank, and there are three final destinations: one is to enter the water collection tank through the diversion pipeline, the second is to enter the water collection tank through the drain tank, the adjustment water tank and the return water pipeline, and the third is to form waves through the drain tank and the control gate, and enter the water collection tank through the test water tank, thus realizing the closed loop of water flow in the wave-making device, which greatly avoids the waste of water resources. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0027] Figure 2 This is a top view of the present invention.

[0028] Figure 3 This is a partial detail view of the present invention.

[0029] Figure 4 This is a cross-sectional view of the test tank of the present invention.

[0030] Figure 5 This is a schematic diagram of the maintenance gate of the present invention.

[0031] Figure 6 This is a schematic diagram of the control gate of the present invention.

[0032] Figure 7 This is a cross-sectional view of the control gate of the present invention.

[0033] Figure 8 This is a schematic diagram of the wave-damping ramp structure of the present invention.

[0034] In the diagram: 1-Drainage tank, 2-Maintenance gate, 3-Pressure regulating pipe, 4-Positioning water tank, 5-Lifting platform, 6-Test water tank, 7-Wave damping net, 8-Flow guide channel, 9-Collection tank, 10-Flow regulating pipe, 11-Flow regulating valve, 12-Centrifugal pump, 13-Return water pipe, 14-Water supply pipe, 15-Water tank support platform, 16-Electromagnetic flow meter, 17-Control gate, 18-Return water valve, 19-Check valve, 20-Selection plate, 21-Drainage tank support frame, 22-Water supply valve, 23-Drainage tank inlet, 24-Drainage tank outlet, 25-Rectifying net, 26-Overflow valve, 27-Overflow pipe, 28-Overflow... Flow tank, 29-Overflow baffle, 30-Return water tank, 31-Level gauge, 32-Water inlet of collection tank, 33-Water outlet of collection tank, 34-Wave height gauge, 35-Wave damping ramp, 36-Flange, 37-Lifting screw, 38-Maintenance gate motor, 39-Maintenance gate screw, 40-Maintenance gate plane, 41-Maintenance gate frame, 42-Motor, 43-Reducer, 44-Coupling, 45-Gear, 46-Gate frame, 47-Blade, 48-Upper shaft, 49-Upper bearing, 50-Upper oil seal, 51-Lower shaft, 52-Lower bearing, 53-Lower oil seal, 54-Supporting ramp, 55-Strip plate. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings:

[0036] like Figure 1-8As shown, the present invention includes a controller, a drain tank 1, a test water tank 6, and a collection tank 9. A regulating water tank 4 is installed on one side of the drain tank 1, and a drain tank support frame 21 is installed below the drain tank 1. A lifting platform 5 is installed at the bottom of the regulating water tank 4. An overflow baffle 29 is vertically installed inside the regulating water tank 4, dividing the regulating water tank 4 into an overflow water tank 28 and a return water tank 30. An overflow pipe connects the overflow water tank 28 to the drain tank 1, and a return water pipe 13 connects the return water tank 30 to the collection tank 9. A water supply pipe 14 is installed between the drain tank 1 and the collection tank 9. The test water tank 6 is located between the drain tank 1 and the collection tank 9. The bottom of the drain tank 1 is connected to the bottom of one end of the test water tank 6 and a control gate 17 is installed thereon. A wave-damping net 7 and a wave-damping screen are installed inside the test water tank 6. The upper part of the test water tank 6 is connected to the water collection tank 9 at the other end of the height meter 34; the control gate 17 includes a gate housing with both ends fixed on the drain tank 1 and the test water tank 6 respectively. The gate housing is provided with a water passage that is connected to the drain tank 1 and the test water tank 6. A motor 42 is provided on the top of the gate housing. Several blades 47 that can be axially rotated and whose opening of the water passage can be adjusted by rotation are driven and connected below the motor 42; an overflow valve 26 is provided on the overflow pipe; a centrifugal pump 12, a check valve 19, a water supply valve 22, and an electromagnetic flow meter 16 are provided on the water supply pipe 14; a return valve 18 is provided on the return water pipe 13; the electromagnetic flow meter 16 and the height meter 34 are connected to the signal input terminal of the controller; and the signal output terminal of the controller is connected to the centrifugal pump 12 and the motor 42.

[0037] A tee connector is installed on the water supply pipe 14. Two of the tee connectors are connected to the outlets of the water supply pipe 14 and the centrifugal pump 12, respectively. The other tee connector is connected to the flow regulating pipe 10. The end of the flow regulating pipe 10 is connected to the water collection tank 9. The inlet of the centrifugal pump 12 is connected to the water collection tank 9 through a pipe. A flow regulating valve 11 is installed on the flow regulating pipe 10. The centrifugal pump 12 should be of a larger flow rate specification, and its flow rate should not be less than the discharge flow rate of the drain tank 1. The flow regulating valve 11 is an electrically adjustable ball valve with an adjustable opening degree, which can accurately adjust the opening degree and control the inlet flow rate of the drain tank 1. A selection plate 20 is installed on the drain tank 1, and an adjustable height water tank support platform 15 is installed at the bottom of the test water tank 6. The height of the water tank support platform 15 can be adjusted by lifting screw 37.

[0038] The control gate 17 is a louvered gate, comprising a motor 42, a reducer 43, a coupling 44, a gate frame 46, and multiple gears 45 and blades 47. All blades 47 are collinear and, when closed, have the same cross-sectional shape as the gate. Each blade 47 is connected to the gate frame 46 via an upper shaft 48 and a lower shaft 51. The upper shaft 48 passes through an upper oil seal 50 and an upper bearing 49 from the inside out, while the lower shaft 51 passes through a lower oil seal 53 and a lower bearing 52 from the inside out. The blades 47 are concentrically and fixedly connected to the gears 45, and the gears 45 mesh with each other. The motor 42 is a PLC-controlled stepper motor, and its rotating shaft is concentrically and fixedly connected to the rotating shaft of the reducer 43, the coupling 44, and the upper shaft 48 of the blades 47. The gate housing of the control gate 17 has gate frames 46 at both ends. One gate frame 46 is fixed to the selection plate 20, and the other gate frame 46 is fixed to the water collection tank 9. A reducer 43 and a coupling 44 are connected below the motor 42. The motor 42 drives several horizontally arranged and meshing gears 45 through the reducer 43 and coupling 44. The top of a blade 47 is connected to the center of a gear 45 via a bearing, and the bottom of the blade 47 is rotatably connected to the bottom of the gate housing via a bearing. The main function of the reducer 43 is to reduce the rotational speed and increase the torque. Because each blade 47 is small, the opening and closing process causes less disturbance to the flow field, ensuring wave stability. The gate 17 is opened and closed by rotating the motor 42, allowing for rapid opening and closing speeds and precise control of the wave cycle.

[0039] The test water tank is equipped with wave-damping nets 7 at intervals. A guide channel 8 extends outward from the top of the test water tank 6, located above the water collection tank 9. The top of the water collection tank 9 is open. A wave-damping ramp 35 is provided between the guide channel 8 and the bottom of the test water tank 6. The wave-damping ramp 35 includes two supporting inclined plates 54, and several strip plates 55 are detachably connected horizontally side-by-side between the two supporting inclined plates 54. A pressure regulating pipe 3 is provided on the drain tank 1. One end of the pressure regulating pipe 3 extends from the top of the drain tank 1 into the drain tank 1, and the other end extends into the gate housing.

[0040] The interfaces between the drain tank 1 and the water supply pipe 14 and the overflow pipe 27 are located below the drain tank 1. A rectifier net 25 is arranged at the interface to ensure the stability of the internal flow field during the water supply and return process of the drain tank 1. The drain tank 1 is equipped with a drain tank inlet 23 and a drain tank outlet 24, and the water collection tank 9 is equipped with a water collection tank inlet 32 ​​and a water collection tank outlet 33. A maintenance gate 2 is installed on the drain tank 1.

[0041] Overflow tank 28 is connected to drain tank 1 via overflow pipe 27. Based on the principle of communicating vessels, the water levels in both tanks are the same. The full water level of overflow tank 28 is at the same elevation as the top of overflow baffle 29, therefore the water level in drain tank 1 is at the same elevation as the top of overflow baffle 29. If the water level in drain tank 1 is higher than the top of overflow baffle 29, excess water in drain tank 1 will flow through overflow pipe 27 into overflow tank 28, and then through overflow baffle 29 into return water tank 30. Return water tank 30 is connected to collection tank 9 via return water pipe 13, and finally, the water in return water tank flows into collection tank 9. Adjustment tank 4 is located above lifting platform 5. By adjusting the height of lifting platform 5, the top elevation of overflow baffle 29 is adjusted, thereby adjusting the water level in drain tank 1. The water tank system is made of 304 stainless steel, and the water trough system is made of acrylic. Except for the vertical pipe connected to the regulating water tank 4, which is made of retractable iron wire aluminum pipe, all other pipes are made of 304 stainless steel. The water supply pipe 14 is equipped with a water supply valve 22, the overflow pipe 27 is equipped with an overflow valve 26, the return water pipe 13 is equipped with a return water valve 18, and the regulating pipe 10 is equipped with a regulating valve 11. To facilitate the replacement of water in the water tank system, the drain tank 1 is equipped with a drain tank inlet 23 and a drain tank outlet 24, and the collection tank 9 is equipped with a collection tank inlet 32 ​​and a collection tank outlet 33.

[0042] The drain tank 1 has a large opening on its side, inside which is installed a maintenance gate 2. The maintenance gate 2 is a 304 stainless steel, four-sided water-stop type, concealed-steel gate. The maintenance gate 2 includes a maintenance gate motor 38, a maintenance gate screw 39, a maintenance gate plane 40, and a maintenance gate frame 41. It is connected to the drain tank 1 via a flange 36. The concealed-steel design is intended to reduce the working height of the maintenance gate 2. Of course, it is understandable that the maintenance gate 2 can be equipped with other opening and closing methods, such as electro-hydraulic or winch-type.

[0043] A plate 20 is installed on the outside of the opening of the drain tank 1. The plate 20 is an open plate with the same opening shape as the cross-sectional shape of the control gate 17. It is connected to both the drain tank 1 and the control gate 17 by flanges. A pressure regulating pipe 3 is installed between the drain tank 1 and the plate 20 to reduce the water hammer pressure during the opening and closing of the control gate 17.

[0044] The working method of the gravity-type wave-generating experimental device of the present invention includes the following steps:

[0045] Step 1: Replace the selected plate 20 and control gate 17 according to wave requirements, adjust the number of strip plates 55 on the wave-dissipating ramp 35, adjust the height of the adjusting water tank 4 by adjusting the height of the lifting platform 5, and adjust the water level in the discharge tank 1 by adjusting the height of the overflow baffle 29 in the adjusting water tank 4. The formula for calculating the lifting height of the lifting platform 5 is:

[0046] h s =hw -h d (1)

[0047] Among them, h s The lifting height of the lifting platform is 5 h. w The designated water level for drain tank 1; h d Adjust the height of the overflow baffle 29 in water tank 4.

[0048] Step 2: Adjust the water level of the drain tank 1 and the collection tank 9 by adjusting the water inlet and outlet of the drain tank 1 and the water inlet and outlet of the collection tank 9. Adjust the water level of the drain tank 1 to be level with the top of the overflow baffle 29, and adjust the collection tank 9 to three-quarters of its height, so that the inlet of the centrifugal pump 12 is lower than the water surface of the collection tank 9. Fill the test water tank 6 with water until the water level is level with the height of the wave-dissipating slope 35.

[0049] Step 3: Based on the opening shape of the selected plate 20 and the water level difference between the drain tank 1 and the test tank 6, the discharge flow rate of the drain tank 1 is calculated using the orifice outflow flow rate calculation formula in hydraulics, as follows:

[0050]

[0051] Where Q is the discharge flow rate; μ is the flow coefficient; A is the area of ​​the opening of the plate 20; H0 is the water level difference between the discharge tank 1 and the test tank 6;

[0052] Step 4: Turn on the centrifugal pump 12 and adjust the flow rate into the drain tank 1 by changing the opening of the flow regulating valve 11. Observe the measured value of the electromagnetic flow meter 16 until the measured value is equal to the discharge flow rate Q in step 3.

[0053] Step 5: Open the control gate 171 and the maintenance gate 2. Observe the change in water level in the drain tank 1 through the level gauge 31, and adjust the opening of the flow regulating valve 11 to keep the water level in the drain tank 1 stable.

[0054] Step 6: The controller controls the rotation speed, angle, and time interval of the motor 42, thereby controlling the opening and closing speed and time interval of the gate 17. The water in the discharge tank 1 continuously discharges, generating continuous waves. During the test, the centrifugal pump 12 is always open. When the gate 17 is open, the pumping flow entering the discharge tank 1 is discharged through the gate 17. If the pumping flow is greater than the discharge flow, the excess flow is discharged through the adjusting tank 4 to keep the water level in the discharge tank 1 stable. When the gate 17 is closed, the pumping flow entering the discharge tank 1 is discharged through the adjusting tank 4, and the water level in the discharge tank 1 remains stable. If the water level in the discharge tank 1 changes significantly during wave generation, it is adjusted by the flow regulating valve 11.

[0055] Step 7: After the waves stabilize, place the marine equipment into the test tank 6 and perform performance tests on the scaled-down model of the marine equipment. After the test, close the maintenance gate 2, overflow valve 26, return water valve 18, centrifugal pump 12, flow regulating valve 11, and control gate 17 in sequence.

[0056] The above description is only a preferred embodiment of this patent. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this patent, and these improvements and substitutions should also be considered within the scope of protection of this patent.

Claims

1. A gravity-based wave generator, characterized in that: The system includes a controller, a drain tank, a test water tank, and a collection tank. A regulating water tank is located on one side of the drain tank, and a lifting platform is located at the bottom of the regulating water tank. An overflow baffle is vertically installed inside the regulating water tank, dividing it into an overflow tank and a return water tank. An overflow pipe connects the overflow tank and the drain tank, and a return water pipe connects the return water tank and the collection tank. A water supply pipe connects the drain tank and the collection tank. The test water tank is located between the drain tank and the collection tank. The bottom of the drain tank is connected to the bottom of one end of the test water tank and is equipped with a control gate. A wave-damping net and a wave meter are installed inside the test water tank. The other end of the test water tank... The control gate is connected to the water collection tank; the control gate includes a gate housing fixed at both ends to the drain tank and the test water tank respectively, and a water passage connected to the drain tank and the test water tank is provided inside the gate housing. A motor is provided above the top of the gate housing, and several blades that can rotate axially and adjust the opening of the water passage by rotation are driven and connected below the motor; an overflow valve is provided on the overflow pipe, a centrifugal pump, a check valve, a water supply valve, and an electromagnetic flow meter are provided on the water supply pipe, and a return valve is provided on the return water pipe. The electromagnetic flow meter and wave height meter are connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the centrifugal pump and the motor. The water supply pipeline is equipped with a T-joint. Two of the joints of the T-joint are connected to the water supply pipeline and the outlet of the centrifugal pump, respectively. The other joint of the T-joint is connected to a flow regulating pipeline. The end of the flow regulating pipeline is connected to a water collection tank. The inlet of the centrifugal pump is connected to the water collection tank through a pipeline. The flow regulating pipeline is equipped with a flow regulating valve. The drain tank is equipped with a selection plate, the bottom of the test tank is equipped with an adjustable height tank support platform, the gate housing of the control gate is equipped with gate frames at both ends, one gate frame is fixed on the selection plate, and the other gate frame is fixed on the collection tank. The motor is connected to a reducer and a coupling below it. The motor drives several horizontally arranged and meshing gears through the reducer and coupling. The top of a blade is connected to the center of a gear through a bearing, and the bottom of the blade is rotatably connected to the bottom of the gate housing through a bearing. The test tank is equipped with wave-damping nets at intervals. A guide channel extends outward from the top of the end of the test tank and is located above the water collection tank. The top of the water collection tank is open. A wave-damping slope is provided between the guide channel and the bottom of the test tank. The wave-damping slope includes two supporting inclined plates, and several strip plates are detachably connected horizontally between the two supporting inclined plates.

2. The gravity wave generator according to claim 1, characterized in that: The drain tank is equipped with a pressure regulating pipe. One end of the pressure regulating pipe extends from the top of the drain tank into the drain tank, and the other end extends into the gate housing.

3. The gravity wave generator according to claim 1, characterized in that: A rectifier net is installed at the outlet of the overflow pipe in the drain tank. The drain tank is equipped with a drain tank inlet and a drain tank outlet. The collection tank is equipped with a collection tank inlet and a collection tank outlet. A maintenance gate is installed on the drain tank.

4. A method for operating the gravity wave generator as described in claim 1, characterized in that, Includes the following steps: Step 1: Replace the selected plate and control gate according to wave requirements, adjust the number of strip plates on the wave-dissipating slope, and adjust the height of the adjusting water tank by adjusting the height of the lifting platform. The water level in the discharge tank is adjusted by the height of the overflow baffle in the adjusting water tank. The formula for calculating the lifting height of the lifting platform is: (1) Among them, h s h is the height at which the lifting platform is raised. w The designated water level in the drain tank; h d To adjust the height of the overflow baffle in the water tank; Step 2: Adjust the water level of the drain tank and the collection tank by adjusting the water inlet and outlet of the drain tank and the water inlet and outlet of the collection tank. Adjust the water level of the drain tank to be level with the top of the overflow baffle and adjust the collection tank to three-quarters of its height so that the inlet of the centrifugal pump is lower than the water surface of the collection tank. Fill the test water tank with water until the water level is level with the height of the wave-dissipating slope. Step 3: Based on the opening shape of the selected plate and the water level difference between the drain tank and the test tank, calculate the discharge flow rate of the drain tank using the orifice outflow calculation formula in hydraulics, as follows: ； Where Q is the discharge flow rate; μ is the flow coefficient; A is the area of ​​the opening of the selected plate; and H0 is the water level difference between the discharge tank and the test tank. Step 4: Turn on the centrifugal pump and adjust the flow rate into the drain tank by changing the opening of the flow regulating valve. Observe the measured value of the electromagnetic flow meter until the measured value is equal to the discharge flow rate Q in Step 3. Step 5: Open the control gate and the maintenance gate. Observe the change in water level in the drain tank through the level gauge and adjust the opening of the flow regulating valve to keep the water level in the drain tank stable. Step 6: The controller controls the motor's rotation speed, angle, and time interval, thereby controlling the gate's opening and closing speed and time interval. Water continuously drains from the spillway tank, generating continuous waves. During the test, the centrifugal pump remains on. When the gate is open, the pumping flow entering the spillway tank is discharged through the gate. If the pumping flow exceeds the discharge flow, the excess flow is discharged through the regulating tank to maintain a stable water level. When the gate is closed, the pumping flow entering the spillway tank is discharged through the regulating tank, maintaining a stable water level. If the water level in the spillway tank changes significantly during wave generation, it is adjusted using the flow regulating valve. Step 7: After the waves stabilize, place the marine equipment into the test tank and conduct performance tests on the scaled-down model of the marine equipment. After the test, close the maintenance gate, overflow valve, return water valve, centrifugal pump, flow regulating valve, and control gate in sequence.

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