Upward wave impact test device based on rolling type deck

Abstract

The invention relates to the technical field of upward wave tests, and discloses an upward wave impact test device based on a rolling type deck. The impact wave is generated by impacting the water surface through the falling body, and the impact process of the turnup wave on the deck in the severe sea condition with large wave height is simulated, so that the test process can be simplified, and the test cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of wave impact testing technology and discloses a wave impact testing device based on a roll-up deck. Background Technology

[0002] Deck surge is a strongly nonlinear problem, related to the wave period, wave height, and bow shape encountered by the ship. The ship undergoes relative motion with the waves, and when the wave head is higher than the bow and freeboard, deck surge occurs. Generally, deck surge problems are divided into two categories: The first category occurs when a ship encounters waves while sailing head-on, with water surging onto the deck from the bow and sides. When the bow and side waves converge, a wave crest forms at the bow, followed by a current flowing along the deck towards the stern; this is called a surge-type deck surge. The second category occurs when large, steep waves collide with the leading edge of the bow of a high-speed ship, causing a high-speed jet of water to directly impact the superstructure and equipment, resulting in severe damage; this is called an overtopping-type deck surge.

[0003] In experimental methods for predicting deck wave loads, for swell-type deck wave problems, there are generally two methods: ship model tank tests and dam-break impact test tanks. Ship model tank tests require fabricating a scaled-down ship model, which is then towed in a towed tank by a trolley to move in the waves, measuring the height of the wave and the wave load. However, ship model tank tests are time-consuming, economical, and make it difficult to observe the impact of the wave, thus failing to adequately study the influence of physical quantities such as wave height and velocity on the wave load. Some wave impact test tanks based on local models typically use dam-break models, where a certain height of dam-break water is accumulated at the bow, and the gate is opened, causing the water to collapse under gravity, creating a high-velocity impact flow that strikes the model. The limitation of dam-break impact test tanks is that dam-break models can only study swell-type deck wave problems and cannot study overturning-type deck wave problems. The problem of overturning deck waves can be investigated in a wave-making pool. Overturning deck waves generally occur in rough sea conditions with large waves and are also the most dangerous situation in deck wave problems. However, the current wave-making pool has limited capacity and it is not easy to generate the corresponding waves for some rough sea conditions with large waves. At the same time, the generated waves are generally generated using a rocking wave generator, which has high testing and maintenance costs and makes it difficult to observe the phenomenon.

[0004] Therefore, it is necessary to design a new type of wave impact tank test device for the problem of wave impact on roll-up decks to solve this problem. Summary of the Invention

[0005] The purpose of this invention is to provide a wave impact test device based on a roll-up deck, which can simulate severe sea conditions with high wave heights, and has low test and maintenance costs and is easy to observe phenomena.

[0006] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows:

[0007] A wave impact test device based on a roll-up deck includes: A water tank is provided with a wave-blocking plate, which divides the water tank into a wave-generating zone and an impact zone. The wave-generating zone stores test water at a preset depth, and the impact zone contains a test model. A water recovery tank is provided at the bottom of the impact zone. The test model includes a deck and a structure fixed on the deck. The drop device is located on one side of the wave-making area of ​​the water tank, and a drop body is provided above the wave-making area. The drop body is used to fall freely into the wave-making area after being released and impact the still water surface, forming a shock wave that passes over the wave barrier and impacts the deck and the buildings on the deck.

[0008] Furthermore, the falling body device includes a falling body frame, a lifting device, a sliding plate clamp, and a release device; the falling body frame is located on one side of the wave-making zone of the water tank; the sliding plate clamp is connected to the falling body; one end of the release device is connected to the sliding plate clamp via a cable, and the other end of the release device is connected to the lifting device; the lifting device is installed on the falling body frame and is used to lift the release device, the sliding plate clamp, and the falling body as a whole to a set height; the release device is used to release the sliding plate clamp and the falling body, so that the falling body impacts the still water surface in the wave-making zone in free fall.

[0009] Furthermore, the falling body is a wedge-shaped body, and the inclined surface on the wedge-shaped body is a water-striking surface used to propel the water towards the wave barrier.

[0010] Furthermore, the angle between the water-bearing surface and the side elevation of the wedge-shaped body is defined as the wedge angle of the falling body, which is determined by the following formula: ; in: The wedge angle of the falling object; To ensure the impact of the tip of the falling object on the still water surface seconds, the horizontal distance from the tip of the falling object is The preset horizontal velocity of the wave-like water body; The water depth of the wave pool; The speed of wave propagation; The velocity of the tip of the falling object upon entering the water; The time it takes for a falling object to reach a set depth after entering the still water surface; This is the acceleration due to gravity.

[0011] Furthermore, the body containing the falling object is also equipped with a counterweight.

[0012] Furthermore, the bulkhead of the impact zone is equipped with mesh stickers.

[0013] Furthermore, an attitude adjustment device is provided at the bottom of the impact zone to adjust the angle of the deck relative to the horizontal plane.

[0014] Furthermore, the attitude adjustment device includes an electrically controlled actuator, the actuator rod of which is connected to the deck to adjust the angle of the deck relative to the horizontal plane.

[0015] Compared with the prior art, the beneficial effects of this invention are: This invention simulates the impact of high-wave-height, severe sea conditions on a deck by generating impact waves through the impact of a falling object on the water surface. This not only simplifies the experimental process but also reduces experimental costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the wave impact test device based on the roll-up deck in the embodiment; Figure 2 This is a schematic diagram of the falling body device in the embodiment; Figure 3 This is a schematic diagram of the structure of the falling object in the embodiment; Figure 4 This is a schematic diagram of the water tank structure in the embodiment; Figure 5 This is a schematic diagram of parameters when the falling object reaches the water depth in the embodiment. Among them, 1-fall device, 11-fall frame, 12-falling body, 121-slamming surface, 122-counterweight, 13-sliding plate clamp, 14-unhooking device, 15-linear guide rod, 2-water tank, 21-wave barrier plate, 22-wave-making zone, 23-impact zone, 24-experimental model, 241-deck, 242-structure on the deck, 25-recovery water storage tank, 26-grid sticker. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0018] See Figures 1 to 5 The present invention provides a wave impact test device based on a roll-up deck, including a water tank 2 and a drop device 1.

[0019] In some embodiments, the water tank 2 is provided with a wave-blocking plate 21, which divides the water tank 2 into a wave-generating zone 22 and an impact zone 23. The wave-generating zone 22 stores test water at a preset depth. The impact zone 23 is equipped with a test model 24 installed through an attitude adjustment device. The test model 24 has a deck 241 and a structure 242 on the deck. A recovery water storage tank 25 is provided at the bottom of the impact zone 23. During the test, the wave impact test model 24 flows into the recovery water storage tank 25 for temporary storage.

[0020] The attitude adjustment device includes electrically controlled actuators. Multiple electrically controlled actuators are installed at the bottom of the deck 241, for example, four electrically controlled actuators are installed at the bottom of the deck 241. The four electrically controlled actuators are arranged in a rectangular pattern. The actuation rod of each electrically controlled actuator is hinged to the deck 241. The bottom of each electrically controlled actuator is fixed to the same floor, which can be fixed to the ground or other fixed points. When it is necessary to adjust the angle of the deck 241 relative to the horizontal plane during the test, the angle of the deck 241 relative to the horizontal plane is adjusted by controlling the extension and retraction of the electrically controlled actuators, thereby adjusting the attitude of the test model 24.

[0021] Furthermore, the walls of both the wave-generating zone 22 and the impact zone 23 are made of transparent acrylic sheets, facilitating observation of the experimental phenomena. Simultaneously, a grid sticker 26 is affixed to the inner wall of the impact zone 23, allowing for observation of wave height and speed after a high-speed camera captures images of the wave phenomenon during the experiment.

[0022] In some embodiments, see Figures 1 to 3 The falling device 1 includes a falling frame 11, a falling body 12, a lifting device, a sliding plate clamp 13, and a release device 14. The falling frame 11 is located on one side of the wave-making zone 22 of the water tank 2, and the falling body 12 is located above the wave-making zone 22. The sliding plate clamp 13 is fixed to the top of the falling body 12 by bolts, and the sliding plate clamp 13 is hung on the release device 14 by a cable. The lifting device includes a cable and a fixed pulley; the fixed pulley is fixed to the top of the falling frame 11; one end of the cable is connected to the release device 14, and the other end passes over the fixed pulley and is connected to an electric winch. The release device 14 can be a manual release device. It should be noted that a depth-limiting rope is also attached to the sliding plate clamp 13. The upper end of the depth-limiting rope is fixed to the top of the falling frame 11. When the falling body 12 falls freely from the starting point to the lowest point, the depth-limiting rope is taut, and the depth of the tip of the falling body 12 from the still water surface is the water penetration depth. In this embodiment, the length of the depth-limiting rope is controlled to control the depth to which the falling object 12 can enter the water.

[0023] During the test, the electric winch winds up the cable to raise the falling body 12 to a set height. Then, the manual release device 14 releases the falling body 12 and the sliding plate clamp 13, allowing them to fall freely into the wave-making zone 22. The falling body 12 impacts the still water surface within the wave-making zone 22, generating waves that then pass over the wave barrier 21, forming tumbling waves that impact the deck and the structure 242 on it, simulating the impact of tumbling waves on the deck in severe sea conditions with high wave heights. It should be noted that the cable can also be manually wound up to raise the height of the falling body 12. A linear guide rod 15 is also provided on the falling frame 11 to ensure that the falling body 12 can be accurately lifted and lowered along the direction of the linear guide rod 15, ensuring the stability of the falling body 12 during the lifting and lowering process and preventing the falling body 12 from deviating or swaying.

[0024] In some embodiments, the falling body 12 is a wedge with a right-angled triangular cross-section, or the tip of the falling body 12 has a right-angled triangular cross-section. The inclined surface of the wedge is the impact surface 121, which is used to directly collide with the still water surface in the wave-generating zone 22, converting the mechanical energy of the falling body 12 into wave energy, thereby generating rolling waves. At the same time, the wedge design can also reduce the air resistance encountered by the falling body 12 during free fall, ensuring that the falling body 12 can impact the still water surface at a predetermined speed and attitude.

[0025] Furthermore, the angle between the water-bearing surface 121 and the side elevation of the wedge-shaped body is defined as the wedge angle of the falling body 12, and is determined by the following formula: ; in: The wedge angle of the falling object 12; To ensure that the tip of the falling object 12 impacts the still water surface after seconds, the horizontal distance from the tip of the falling object is 12 seconds. The preset horizontal velocity of the wave-like water body; The wave pool is 22 meters deep. For the wave propagation speed, ; The velocity of the tip of the falling object 12 when it just touches the still water surface is calculated using the free fall motion formula with an initial velocity of zero, and is used as the velocity of the tip of the falling object 12 when it enters the water. The time it takes for the falling object 12 to reach a set depth after entering the water from the still water surface is assumed to be the time it takes. With water entry speed Calculated; Let gravitational acceleration be the value. . The value can be obtained by measuring the horizontal distance between the tip of the falling object 12 and the wave barrier 21, and then by... Calculate the time it takes for the wave to travel from the tip of the falling object 12 to the wave barrier 21. During the experiment, in order to determine the wedge angle of the falling object 12... First, based on the energy required for the tumbling waves to impact the deck and the structures on it, the preset horizontal velocity of the wave-damped water at 21 locations was set. Then, the corresponding wedge angle is determined using the wedge angle calculation formula. Finally, the corresponding wedge angle is adopted. The falling object 12 was tested. This invention comprehensively considers the preset horizontal velocity of the wave water at the wave barrier 21. The water depth of wave pool 22 Wave propagation speed The water entry velocity of the tip of the falling object 12 Time it takes for the falling object 12 to reach the set depth upon entering the water To accurately calculate the wedge angle of the falling object 12. This ensures that the test device generates rolling waves that meet the test requirements, accurately simulating the impact of waves on the deck under actual sea conditions, improving the accuracy of the test, and also enhancing the applicability and flexibility of the test device, enabling it to meet the test requirements under different sea conditions and ship types.

[0026] In some embodiments, the falling body 12 is provided with a counterweight cavity. During the test, counterweight blocks 122 can be added or removed into the counterweight cavity according to the required impact speed of the falling body 12 on the water surface 121. It should be noted that within the counterweight cavity, all counterweight blocks 122 can be fixed as a whole by means of hoops, or each counterweight block 122 can be fixed individually by bolts, or other methods can be used to fix the counterweight blocks 122. Moreover, the falling body 12 is provided with a cover plate to seal the counterweight cavity, and a sealing ring is provided between the cover plate and the falling body 12 to prevent water from seeping into the counterweight cavity.

[0027] The test method based on the wave impact test device of the roll-up deck 241 in this invention includes the following steps: Step 1: Adjust the angle of the deck 241 of the test model 24 using the attitude adjustment device, and install a pressure sensor on the test model 24; Step 2: Fill the wave-making area 22 of water tank 2 with test water to a specified depth; Step 3: Raise the falling object 12 to the set height, and then release the falling object 12 using the release hook 14. The falling object 12 impacts the still water surface, generating impact waves that pass over the wave barrier 21 and impact the test model 24. At the same time, a high-speed camera is used to take pictures of the wave phenomenon on the deck, and a pressure sensor is used to detect the impact force of the waves on the test model 24. After a single impact, the water flows into the recycling tank 25 for recycling. Step 4: Analyze the experimental data.

[0028] It should be noted that during the experiment, in order to obtain shock waves with different parameters, the counterweight of the falling body 12, the free fall height or the wedge angle can be adjusted as needed, and then steps one to three can be repeated.

[0029] Compared with traditional ship model pool tests, this invention has the advantages of shorter test cycle and higher economic efficiency, and it is also easier to observe test phenomena. Compared with traditional dam-break test tanks, this invention can study the wave problem of the overturning deck 241. This invention uses the impact of the falling body 12 to generate impact waves, replacing the existing rocking plate wave generator, improving the economy and convenience of the test. At the same time, various impact wave parameters can be obtained by changing parameters such as the fall height of the falling body 12.

[0030] This invention generates impact waves by dropping an object 12 onto a still water surface, simulating the impact of high-wave-height turbulent waves on a deck in severe sea conditions. This not only simplifies the testing process but also reduces testing costs. Furthermore, by adjusting the weight, wedge angle, and drop height of the dropping object 12, impact waves with different parameters can be simulated to obtain corresponding impact effects, thus improving the flexibility and accuracy of the test.

[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wave impact testing device based on a roll-up deck, characterized in that, include: A water tank (2) is provided with a wave barrier (21) inside the water tank (2), which divides the water tank (2) into a wave-making zone (22) and an impact zone (23). The wave-making zone (22) stores test water of a preset depth. The impact zone (23) is provided with a test model (24), and the bottom of the impact zone (23) is provided with a water recovery tank (25). The test model (24) includes a deck (241) and a structure (242) fixed on the deck (241). The falling device (1) is located on one side of the wave-making area (22) of the water tank (2), and the falling device (1) is provided with a falling body (12) above the wave-making area (22). The falling body (12) is used to fall freely into the wave-making area (22) after being released and impact the still water surface to form a shock wave that passes over the wave barrier (21) and impacts the deck (241) and the building (242) on the deck.

2. The wave impact test device based on a roll-up deck as described in claim 1, characterized in that, The falling device (1) includes a falling frame (11), a lifting device, a sliding plate clamp (13), and a release device (14); the falling frame (11) is located on one side of the wave-making area (22) of the water tank (2); the sliding plate clamp (13) is connected to the falling body (12); one end of the release device (14) is connected to the sliding plate clamp (13) via a cable, and the other end of the release device (14) is connected to the lifting device; the lifting device is installed on the falling frame (11) and is used to lift the release device (14), the sliding plate clamp (13), and the falling body (12) as a whole to a set height; the release device (14) is used to release the sliding plate clamp (13) and the falling body (12) so that the falling body (12) impacts the still water surface in the wave-making area (22) in free fall motion.

3. The wave impact test device based on a roll-up deck as described in claim 2, characterized in that, The falling body (12) is a wedge-shaped body, and the inclined surface on the wedge-shaped body is the water-bombing surface (121), which is used to push the water body towards the wave barrier (21).

4. The wave impact test device based on a roll-up deck as described in claim 3, characterized in that, The angle between the water-bearing surface (121) and the side elevation of the wedge is defined as the wedge angle of the falling body (12), which is determined by the following formula: ； in: The wedge angle of the falling object (12); To ensure that after the tip of the falling object (12) impacts the still water surface seconds, the horizontal distance from the tip of the falling object (12) is The preset horizontal velocity of the wave-like water body; The water depth of the wave pool (22); The speed of wave propagation; The velocity of the tip of the falling object (12) upon entering the water; The time it takes for the falling object (12) to reach a set depth after entering the water from the still water surface; This is the acceleration due to gravity.

5. The wave impact test device based on a roll-up deck as described in claim 3, characterized in that, The falling object (12) is also equipped with a counterweight (122).

6. The wave impact test device based on a roll-up deck as described in claim 1, characterized in that, The bulkhead of the impact zone (23) is covered with mesh stickers (26).

7. The wave impact test device based on a roll-up deck as described in claim 1, characterized in that, The bottom of the impact zone (23) is provided with an attitude adjustment device for adjusting the angle of the deck (241) relative to the horizontal plane.

8. The wave impact test device based on a roll-up deck as described in claim 7, characterized in that, The attitude adjustment device includes an electrically controlled actuator, the actuator rod of which is connected to the deck (241) to adjust the angle of the deck (241) relative to the horizontal plane.

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