An experimental apparatus and method for simulating ship motion under severe sea conditions.

Abstract

This invention relates to an experimental apparatus and method for simulating ship motion under severe sea conditions, belonging to the field of ship wave load testing technology. It addresses the problem that existing severe sea condition wave load testing technologies are insufficient in simulating realistic waves under actual sea conditions, such as high wave heights, distorted waves, and breaking waves. The wave-generating system includes a wave-generating plate located at one end of a water tank and swinging along the length of the tank, and a driving component for driving the wave-generating plate's swing. The nonlinear wave generation system includes a wave-generating rod and several jet pipes. The wave-generating rod is arranged along the width of the water tank and slidably set along the height of the water tank via a height adjustment component. The jet pipes are all located at the bottom of the water tank. This invention enables the simulation of the water-air mixture flow field and accurate measurement of loads in distorted and nonlinear waves under severe sea conditions. It allows for a wide variety of experimental types and diverse functions, and can replace the expensive and costly towing tanks used for general ship models.

Description

Technical Field

[0001] This invention relates to a test apparatus and test method for simulating ship motion under severe sea conditions, belonging to the field of ship wave load testing technology. Background Technology

[0002] Slamming and wave-on loads in severe sea states are major hazards causing structural damage to ships and offshore platforms and threatening the lives of crew members. Generally, ships encountering severe sea states during ocean voyages experience significant relative motion between the ship and waves, generating high-frequency, strong nonlinear loads such as slamming and wave-on loads even at low or zero speeds. Since slamming and wave-on loads in severe sea states are a strongly nonlinear gas-liquid-solid three-phase coupling problem, and the relevant theories of three-phase coupling are still incomplete, the simulation accuracy and computational efficiency of numerical methods also have issues. Therefore, wave load model testing technology is one of the important means to study slamming and wave-on loads. In research, model experiments using partial or complete ship models moving in artificial waves are commonly used to simulate wave loads in severe sea states, serving the structural safety design of marine structures.

[0003] Existing wave load testing technologies for severe sea states are limited by the availability of domestic wave generators. Typical water tank experiments often limit wave generation to regular and irregular waves below 28 mm, with only a few ultra-large water tanks capable of generating waves exceeding 28 mm. Simulation techniques for realistic waves under severe sea conditions, such as high wave heights, distorted waves, and breaking waves, are immature, and the nonlinear simulation of the flow field is insufficient during experiments. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problems and thereby provide a test device and test method for simulating ship motion under severe sea conditions.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] An experimental device for simulating ship motion under severe sea conditions includes a water tank, a ship model, a one-way trolley, a wave-making system, and a nonlinear wave generating system. The one-way trolley is installed at the top of the water tank, and the ship model is fixed at the bottom of the water tank, suspended and moored in the water tank, hoisted above the water tank by a release device, or installed below the one-way trolley. When the ship model is installed below the one-way trolley, the one-way trolley controls the ship model to move along the length of the water tank. The wave-making system includes a wave-making plate located at one end of the water tank and swinging along the length of the water tank, and a drive component for driving the wave-making plate to swing. The nonlinear wave generating system includes a wave-generating rod and several jet pipes. The wave-generating rod is arranged along the width of the water tank and is slidably set along the height of the water tank by a height adjustment component. The several jet pipes are all located at the bottom of the water tank.

[0007] Furthermore, the drive assembly includes a motor, a push rod, and a universal joint. The fixed end of the push rod is fixed to the inner wall of the water tank. The push rod is driven to extend and retract by the motor. The wave-generating plate is connected to the output end of the push rod through the universal joint.

[0008] Furthermore, a wave-dissipating dam is machined on the inner wall of the end of the water tank away from the wave-generating system, and the wave-dissipating dam is stepped.

[0009] Furthermore, the height adjustment assembly includes a pair of slide rails vertically fixed to the outer walls of both sides of the water tank and a pair of electromagnetic sliders correspondingly slidably disposed on the pair of slide rails. The top wave rod is a hollow iron rod structure and is disposed between the pair of electromagnetic sliders.

[0010] Furthermore, several jet pipes are arranged along the width of the water tank.

[0011] Furthermore, the water tank is made of transparent tempered glass.

[0012] Furthermore, the cross-section of the top wave rod is semi-circular, and its length is consistent with the internal width of the water tank.

[0013] Furthermore, the unidirectional trolley includes a track and four pulleys, wherein the track is an I-beam structure and its two ends are fixed to the top of the two ends of the water tank in the longitudinal direction, and the four pulleys are symmetrically arranged on both sides of the track and move along the length of the track.

[0014] Furthermore, the ship model and the one-way vehicle are connected by a model attitude adjustment component, which includes two model connecting rods and four height adjustment rods. The upper part of the four height adjustment rods is rotatably connected to four pulleys, and the top of the ship model is connected to the bottom of the four height adjustment rods through the two model connecting rods.

[0015] A test method employing any of the above-mentioned test devices includes: wave resistance and wave load measurement experiments on a fixed ship model; wave resistance and wave load measurement experiments on a towed ship model; a still water surface free-fall slamming experiment on a ship model; a nonlinear water-air coupling surface free-fall slamming experiment on a ship model; a linear wave free-fall slamming experiment on a ship model; a nonlinear wave free-fall slamming experiment on a ship model; and a slamming wave load measurement experiment on a ship model under severe sea conditions, wherein:

[0016] 1. When conducting wave resistance and wave load measurement experiments on a fixed ship model, fix the position of the ship model, then lower the top wave bar to the bottom of the water tank, turn on the power of the wave-making system, and drive the drive component to drive the wave-making plate to swing and generate linear waves.

[0017] 2. When conducting waveform and wave load measurement experiments on towed boat models, lower the top wave bar to the bottom of the water tank, turn on the power of the wave-making system, drive the wave-making plate to swing and generate linear waves, and drive the boat model to move back and forth in the water tank in a fixed posture through the one-way trolley.

[0018] 3. When conducting the free fall impact test on the model boat in still water, the model boat is dropped into the water from a specified height in a fixed posture while in still water.

[0019] IV. When conducting the nonlinear water-air coupling surface free fall impact test on the ship model, open the jet pipe and spray air upward to generate a nonlinear wave of water-air coupling, and let the ship model fall into the water at a specified height with a fixed posture.

[0020] 5. When conducting the linear wave free fall impact test on the boat model, lower the top wave rod to the bottom of the water tank, turn on the power of the wave-making system, drive the component to drive the wave-making plate to swing and generate linear waves, and let the boat model fall into the water at a specified height in a fixed posture.

[0021] VI. When conducting the nonlinear wave free fall impact test on the ship model, lower the top wave rod to the bottom of the water tank, turn on the power of the wave-making system, and drive the wave-making plate to swing to generate linear waves; then, by controlling the up and down movement of the top wave rod below the linear wave water surface, nonlinear waves are generated; then, open the jet pipe to spray air upwards to generate water-air coupled nonlinear waves; finally, let the ship model fall freely into the water at a specified height in a fixed posture.

[0022] VII. When conducting the wave load measurement experiment on the ship model under severe sea conditions, lower the top wave rod to the bottom of the water tank, turn on the power of the wave-making system, and drive the wave-making plate to swing to generate linear waves. Then, by controlling the up and down movement of the top wave rod under the linear wave water surface, nonlinear waves are generated. Next, open the jet pipe to spray air upwards to generate water-air coupled nonlinear waves. Finally, use a one-way trolley to drive the ship model to move back and forth in the water tank in a fixed posture.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] By periodically oscillating the wave-generating plate along the length of the water tank, the water in the tank is pushed to the left, creating regular waves.

[0025] By using the top wave rod, a general regular wave with low wave height can be extended into a large wave height distorted wave or a nonlinear wave with a specified wave height and frequency, thereby reducing the requirement for the maximum wave generation capacity of the wave generator.

[0026] The jet pipe at the bottom of the tank can quantitatively add air bubbles to the water, generating a gas-liquid coupled flow field that simulates the broken free surface and nonlinear breaking wave in actual ocean waves, more closely resembling the nonlinear flow field under actual sea conditions.

[0027] The experimental device for simulating ship motion under severe sea conditions, as described in this invention, can not only simulate regular waves, but also simulate the water-air mixed flow field and accurately measure the load in deformed waves and nonlinear waves under severe sea conditions. It can perform a wide variety of experiments and has diverse functions, and can replace the expensive towing tanks for general ship models. Attached Figure Description

[0028] Figure 1 This is a front view schematic diagram of an experimental device for simulating ship motion under severe sea conditions according to the present invention;

[0029] Figure 2 This is a top view schematic diagram of an experimental device for simulating ship motion under severe sea conditions according to the present invention;

[0030] Figure 3 This is a schematic diagram of linear wave generation;

[0031] Figure 4 This is a schematic diagram of nonlinear wave generation.

[0032] Figure 5 This is a structural diagram of the model pose adjustment component;

[0033] Figure 6 This is a schematic diagram of the ship model's tilt attitude.

[0034] In the diagram: 1. Water tank; 2. Rotating shaft; 3. Push rod; 4. Universal joint; 5. Push plate; 6. Wave-making plate; 7. Wave-dissipating dike; 8. Air jet pipe; 9. Slide rail; 10. Electromagnetic slider; 11. Wave-top rod; 12. Car track; 13. Pulley; 14. Height adjustment rod; 15. Model connecting rod; 16. Ship model. Detailed Implementation

[0035] Specific implementation method one: Combining Figures 1-6 This embodiment describes an experimental device for simulating ship motion under severe sea conditions, comprising a water tank 1, a ship model 16, a one-way trolley, a wave-generating system, and a nonlinear wave generating system. The one-way trolley is installed at the top of the water tank 1. The ship model 16 is fixed to the bottom of the water tank 1, suspended and moored in the water tank 1, or hoisted above the water tank 1 via a release device, or installed below the one-way trolley. When the ship model 16 is installed below the one-way trolley, the one-way trolley controls the movement of the ship model 16 along the length of the water tank 1. The wave-generating system includes a wave-making plate 6 located at one end of the water tank 1 and swinging along the length of the water tank 1, and a drive assembly for driving the wave-making plate 6 to swing. The nonlinear wave generating system includes a wave-top rod 11 and several jet pipes 8. The wave-top rod 11 is arranged along the width of the water tank 1 and slidably set along the height of the water tank 1 via a height adjustment assembly. The several jet pipes 8 are all located at the bottom of the water tank 1.

[0036] The bottom end of the wave-generating plate 6 is rotatably mounted on the bottom of the water tank 1 via a rotating shaft 2, the cross-section of which is preferably semi-circular. By periodically oscillating along the length of the water tank 1, the wave-generating plate 6 pushes the water in the water tank 1 to move to the left, creating regular waves.

[0037] When a wave crest or trough reaches the position of the top wave rod 11, the height adjustment component controls the top wave rod 11 to move up and down, thereby changing the shape of the wave. The linear wave generated from the wave-generating system can be transformed into a nonlinear or distorted wave under the interference of the up-and-down movement of the top wave rod 11. By using the top wave rod 11 to expand a low-height, general, regular wave into a high-height, distorted wave or a nonlinear wave with a specified wave height and frequency, the requirement for the maximum wave-generating capacity of the wave generator is reduced.

[0038] The jet pipe 8 at the bottom of the water tank 1 can quantitatively add air bubbles to the water, which can generate a gas-liquid coupled flow field, simulating the broken free surface and nonlinear breaking wave in actual ocean waves, and is closer to the nonlinear flow field under actual sea conditions.

[0039] The one-way trolley is straddling the top of the water tank 1 and located on the centerline of the top of the water tank 1. An I-beam structure is used as the track for the forward and backward movement of the ship model 16.

[0040] Using the experimental apparatus of the present invention for simulating ship motion under severe sea conditions, at least the following five types of tests can be performed:

[0041] 1. Wave resistance and wave load measurement experiment of offshore platform (the position of the ship model 16 is fixed, that is, the ship model 16 is fixed at the bottom of the water tank 1 or suspended and moored in the water tank 1 in a fixed position as required);

[0042] 2. Waveform and wave load measurement experiment of towed model 16 (model 16 moves with a one-way vehicle);

[0043] 3. Free fall impact test on a general still water surface and a nonlinear water-air coupling surface (the boat model 16 falls into the water freely, that is, the boat model 16 is hoisted above the water tank 1 by a release hook. During hoisting, the fixed posture of the boat model 16 is adjusted. The release hook pulls the boat model 16 to the specified drop height above the water surface. The release hook releases the hook, causing the boat model 16 to lose the tension and fall into the water freely).

[0044] 4. Free fall impact experiment under linear and nonlinear wave conditions (wave generation + free fall of model ship 16);

[0045] 5. Measurement experiment of slamming wave load on model ship 16 under severe sea conditions (nonlinear distorted wave).

[0046] The experimental device for simulating ship motion under severe sea conditions, as described in this invention, can not only simulate regular waves, but also simulate the water-air mixed flow field and accurately measure the load in deformed waves and nonlinear waves under severe sea conditions. It can perform a wide variety of experiments and has diverse functions, and can replace the expensive and costly towing tank of a general ship model.

[0047] The drive assembly includes a motor, a push rod 3, and a universal joint 4. The fixed end of the push rod 3 is fixed to the inner wall of the water tank 1. The motor drives the push rod 3 to extend and retract. The wave-making plate 6 is connected to the output end of the push rod 3 via the universal joint 4. Preferably, the universal joint 4 and the push rod 3 are connected by bolts, and the wave-making plate 6 is preferably fixed to the universal joint 4 via a push plate 5. The connection between the wave-making plate 6 and the push plate 5 is preferably welded or bolted. One end of the water tank 1 has a cavity, and the motor is arranged inside the cavity. The motor drives the push rod 3 to extend and retract, thus providing energy input to the wave-making system. Under the connection of the universal joint 4, the wave-making plate 6 is driven to swing along the length of the water tank 1. When the wave-making machine is turned on, the motor drives the push rod 3 to perform periodic linear motion. The universal joint 4 converts the linear motion into the circular motion of the wave-making plate 6, causing the wave-making plate 6 to swing regularly, pushing the water in the water tank 1 to the left, creating waves. Figure 3 The regular wave shown.

[0048] A wave-dissipating dam 7 is machined on the inner wall of the end of the water tank 1 away from the wave-generating system. The wave-dissipating dam 7 is stepped. With this design, the waves generated by the wave-generating system eventually move to the vicinity of the wave-dissipating dam 7. The stepped shape of the wave-dissipating dam 7 can break up the waves generated by the wave generator and dissipate their energy quickly, avoiding the formation of reflected waves that interfere with the flow field.

[0049] The height adjustment assembly includes a pair of slide rails 9 vertically fixed to the outer walls of both sides of the water tank 1, and a pair of electromagnetic sliders 10 correspondingly slidably mounted on the slide rails 9. The top wave rod 11 is a hollow iron rod structure and is located between the pair of electromagnetic sliders 10. In this design, the slide rails 9 are made entirely of aluminum and are arranged perpendicular to the ground plane. The shape of the electromagnetic sliders 10 matches the slide rails 9. After the electromagnetic sliders 10 are energized, they can still move freely up and down along the aluminum slide rails 9. At the same time, the electromagnetic force controls the top wave rod 11 to move up and down synchronously with the electromagnetic sliders 10.

[0050] Several jet pipes 8 are arranged along the width of the water tank 1. With this design, the jet pipes 8 are fixed in a row at the bottom of the water tank 1. When the wave-making system is not generating waves, the jet pipes 8 can further transform the still water surface from a static plane into a dynamic curved surface containing bubbles. During the wave-making process, the waves can contain bubbles to create two-phase waves with water-air coupling.

[0051] The water tank 1 is made of transparent tempered glass. This design facilitates the accurate recording of hydrodynamic phenomena of the ship model 16 under special flow field environments such as deformed waves and breaking waves.

[0052] The cross-section of the top wave rod 11 is semi-circular, and its length is consistent with the internal width of the water tank 1.

[0053] The unidirectional trolley includes a track 12 and four pulleys 13. The track 12 is an I-beam structure with its two ends fixed to the top of both ends of the water tank 1 in the longitudinal direction. The four pulleys 13 are symmetrically arranged in pairs on both sides of the track 12 and move along the length of the track 12. In this design, each pulley 13 is embedded in both sides of the track 12 and tangent to the upper and lower plates of the I-beam, realizing constant or non-constant speed forward and backward movement along the track 12.

[0054] The ship model 16 is connected to the one-way trolley via a model attitude adjustment assembly. This assembly includes two model connecting rods 15 and four height adjustment rods 14. The upper parts of the four height adjustment rods 14 are rotatably connected to four pulleys 13. The top of the ship model 16 is connected to the bottom of the four height adjustment rods 14 via the two model connecting rods 15. This design allows the model attitude adjustment assembly to control the ship model 16 to move in a flow field with three-dimensional attitudes such as roll and pitch, simulating the asymmetric slamming and wave-climbing of a ship in actual sea conditions. By changing the lengths of the height adjustment rods 14 and the corresponding model connecting rods 15, or by adjusting the installation position of the model connecting rods 15 on the height adjustment rods 14, the attitude of the ship model 16 can be adjusted, thereby simulating roll, pitch, and yaw of the ship model 16. The upper part of the height adjustment rod 14 is connected to the central axis of the pulley 13 via a bushing, ensuring that while the pulley 13 rolls forward, the height adjustment rod 14 only performs translational movement in the forward and backward directions. The two ends of each model connecting rod 15 are fixed to the lower ends of the two height adjusting rods 14 by bolts. The height adjusting rods 14, model connecting rods 15 and ship model 16 are kept rigidly fixed, thereby realizing the forward and backward movement of ship model 16.

[0055] A test method employing any of the above-mentioned test devices includes: wave resistance and wave load measurement experiments on a fixed ship model 16; wave resistance and wave load measurement experiments on a towed ship model 16; a still water surface free-fall slamming experiment on the ship model 16; a nonlinear water-air coupling surface free-fall slamming experiment on the ship model 16; a linear wave free-fall slamming experiment on the ship model 16; a nonlinear wave free-fall slamming experiment on the ship model 16; and a slamming wave load measurement experiment on the ship model 16 under severe sea conditions, wherein:

[0056] 1. When conducting wave resistance and wave load measurement experiments on the fixed ship model 16, fix the position of the ship model 16 (specifically, the ship model 16 can be fixed at the bottom of the water tank 1 or suspended and moored in the water tank 1 at a fixed position as required), then lower the top wave rod 11 to the bottom of the water tank 1, turn on the power of the wave-making system, and drive the drive component to drive the wave-making plate 6 to swing and generate linear waves.

[0057] 2. When conducting waveform and wave load measurement experiments on the towed boat model 16, the top wave rod 11 is lowered to the bottom of the water tank 1, the power of the wave-making system is turned on, the drive component drives the wave-making plate 6 to swing and generate linear waves, and the boat model 16 is driven to move back and forth in the water tank 1 in a fixed posture by the one-way trolley.

[0058] 3. When conducting the still water free fall impact test on the boat model 16, in still water, the boat model 16 is dropped into the water at a specified height with a fixed posture (the specific operation is as follows: the boat model 16 is hoisted above the water tank 1 by the release hook, the fixed posture of the boat model 16 is adjusted during hoisting, the boat model 16 is pulled up to the specified drop height above the water surface by the release hook, the release hook is released so that the boat model 16 loses the tension and drops into the water).

[0059] IV. When conducting the nonlinear water-air coupling surface free fall impact test on the ship model 16, open the jet pipe 8 to spray air upwards to generate a nonlinear wave of water-air coupling, and let the ship model 16 fall into the water at a specified height with a fixed attitude.

[0060] 5. When conducting the linear wave free fall impact test on the boat model 16, lower the top wave rod 11 to the bottom of the water tank 1, turn on the power of the wave-making system, drive the wave-making plate 6 to swing to generate a linear wave, and let the boat model 16 fall into the water at a specified height in a fixed posture.

[0061] VI. When conducting the nonlinear wave free fall impact experiment on the boat model 16, lower the top wave rod 11 to the bottom of the water tank 1, turn on the power of the wave-making system, and drive the wave-making plate 6 to swing to generate a linear wave; then, by controlling the up and down movement of the top wave rod 11 below the linear wave surface (quantitatively changing the waveform parameters, such as period and wave height), a nonlinear wave is generated; then, open the jet pipe 8 to spray air upwards to generate a water-air coupled nonlinear wave; finally, let the boat model 16 fall freely into the water at a specified height in a fixed posture.

[0062] VII. When conducting the test of the slamming wave load on the model ship 16 under severe sea conditions, the top wave rod 11 is lowered to the bottom of the water tank 1, the power of the wave-making system is turned on, and the drive component drives the wave-making plate 6 to swing to generate a linear wave; then, by controlling the up and down movement of the top wave rod 11 under the linear wave water surface (quantitatively changing the waveform parameters, such as period and wave height), a nonlinear wave is generated; then, the jet pipe 8 is opened to spray air upwards to generate a water-air coupled nonlinear wave; finally, the model ship 16 is driven to move back and forth in the water tank 1 in a fixed posture by a one-way trolley.

Claims

1. A test apparatus for simulating ship motion under severe sea conditions, characterized in that: The system includes a water tank (1), a boat model (16), a one-way trolley, a wave-making system, and a nonlinear wave-generating system. The one-way trolley is installed at the top of the water tank (1). The boat model (16) is fixed at the bottom of the water tank (1), suspended and moored in the water tank (1), or hoisted above the water tank (1) by a release device or installed below the one-way trolley. When the boat model (16) is installed below the one-way trolley, the boat model (16) is moved along the length of the water tank (1) by the one-way trolley. The wave-making system includes a wave-making plate (6) located at one end of the water tank (1) and swinging along the length of the water tank (1) and a drive assembly that drives the wave-making plate (6) to swing. The nonlinear wave-generating system includes a top wave rod (11) and several jet pipes (8). The top wave rod (11) is arranged along the width of the water tank (1) and is slidably set along the height of the water tank (1) by a height adjustment assembly. Several jet pipes (8) are all opened at the bottom of the water tank (1). Regular waves are generated by the periodic oscillation of the wave-generating plate (6) along the length of the water tank (1); when the wave crest or trough reaches the position of the top wave rod (11), the top wave rod (11) is moved up and down by the height adjustment component to change the shape of the wave. The linear wave generated from the wave-generating system is transformed into a nonlinear wave or a deformed wave under the interference of the up and down movement of the top wave rod (11). The one-way vehicle includes a track (12) and four pulleys (13). The track (12) is an I-beam structure and its two ends are fixed to the top of both ends of the water tank (1) along its length. The four pulleys (13) are symmetrically arranged on both sides of the track (12) and move along the length of the track (12). The ship model (16) is connected to the one-way vehicle through a model attitude adjustment component. The model attitude adjustment component includes two model connecting rods (15) and four height adjustment rods (14). The upper part of the four height adjustment rods (14) is rotatably connected to four pulleys (13). The top of the ship model (16) is connected to the bottom of the four height adjustment rods (14) through the two model connecting rods (15).

2. The experimental apparatus for simulating ship motion under severe sea conditions according to claim 1, characterized in that: The drive assembly includes a motor, a push rod (3) and a universal joint (4). The fixed end of the push rod (3) is fixed on the inner wall of the water tank (1). The push rod (3) is driven to extend and retract by the motor. The wave-making plate (6) is connected to the output end of the push rod (3) through the universal joint (4).

3. The experimental apparatus for simulating ship motion under severe sea conditions according to claim 1 or 2, characterized in that: The inner wall of the water tank (1) at the end away from the wave-making system is processed with a wave-dissipating dam (7), which is stepped.

4. The experimental apparatus for simulating ship motion under severe sea conditions according to claim 1, characterized in that: The height adjustment assembly includes a pair of slide rails (9) vertically fixed on the outer walls of both sides of the water tank (1) and a pair of electromagnetic sliders (10) correspondingly slidably disposed on the pair of slide rails (9). The top wave rod (11) is an iron hollow rod structure and is disposed between the pair of electromagnetic sliders (10).

5. The experimental apparatus for simulating ship motion under severe sea conditions according to claim 1, characterized in that: Several jet pipes (8) are arranged along the width of the water tank (1).

6. The experimental apparatus for simulating ship motion under severe sea conditions according to claim 1, characterized in that: The water tank (1) is made of transparent tempered glass.

7. The experimental apparatus for simulating ship motion under severe sea conditions according to claim 1, characterized in that: The cross-section of the top wave rod (11) is semi-circular, and the length of the top wave rod (11) is consistent with the internal width of the water tank (1).

8. A test method based on the test apparatus according to any one of claims 1 to 7, characterized in that: The experiments include wave resistance and wave load measurement tests on a fixed ship model (16), wave resistance and wave load measurement tests on a towed ship model (16), still water free-fall slamming tests on the ship model (16), nonlinear water-air coupling surface free-fall slamming tests on the ship model (16), linear wave free-fall slamming tests on the ship model (16), nonlinear wave free-fall slamming tests on the ship model (16), and wave load measurement tests on the ship model (16) under severe sea conditions.

1. When conducting the wave resistance and wave load measurement experiment of the fixed ship model (16), fix the position of the ship model (16), then lower the top wave rod (11) to the bottom of the water tank (1), turn on the power of the wave-making system, and drive the drive component to drive the wave-making plate (6) to swing and generate linear waves.

2. When conducting wave resistance and wave load measurement experiments on the towed boat model (16), the top wave rod (11) is lowered to the bottom of the water tank (1), the power of the wave-making system is turned on, the drive component drives the wave-making plate (6) to swing and generate linear waves, and the boat model (16) is driven to move back and forth in the water tank (1) in a fixed posture by the one-way trolley.

3. When conducting the free fall impact test on the still water surface of the boat model (16), the boat model (16) is dropped into the water at a specified height in a fixed posture under still water conditions.

4. When conducting the nonlinear water-air coupling surface free fall impact test on the ship model (16), open the jet pipe (8) to spray air upwards to generate a nonlinear wave of water-air coupling, and let the ship model (16) fall into the water at a specified height with a fixed posture.

5. When conducting the linear wave free fall impact test on the boat model (16), lower the top wave rod (11) to the bottom of the water tank (1), turn on the power of the wave-making system, drive the wave-making plate (6) to swing to generate linear waves, and let the boat model (16) fall into the water at a specified height in a fixed posture. VI. When conducting the nonlinear wave free fall impact experiment on the ship model (16), lower the top wave rod (11) to the bottom of the water tank (1), turn on the power of the wave-making system, drive the wave-making plate (6) to swing to generate linear waves; then, by controlling the up and down movement of the top wave rod (11) under the linear wave water surface, nonlinear waves are generated; then, open the jet pipe (8) to jet upwards to generate water-air coupled nonlinear waves; finally, let the ship model (16) fall into the water at a specified height with a fixed posture. VII. When conducting the test of the slamming wave load on the ship model (16) under severe sea conditions, lower the top wave rod (11) to the bottom of the water tank (1), turn on the power of the wave-making system, drive the wave-making plate (6) to swing and generate linear waves; then, by controlling the up and down movement of the top wave rod (11) under the linear wave water surface, nonlinear waves are generated; then, open the jet pipe (8) to spray air upwards and generate water-air coupled nonlinear waves; finally, drive the ship model (16) to move back and forth in the water tank (1) in a fixed posture through the one-way trolley.

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