A passive wave-damping experimental device with a composite structure

Abstract

This invention discloses a passive wave-damping experimental device with a composite structure, comprising a water tank containing experimental water. A supporting frame is fixed to the bottom plate of the water tank. A triangular wave-damping mesh, composed of equilateral triangular prism basic units and covered with stainless steel wire mesh, is installed at the front end of the supporting frame. Multiple rows of inclined perforated permeable plates are longitudinally fixed to the supporting frame via connecting rods arranged at equal intervals on the upper and lower ends. At least three horizontal plates are arranged between the perforated permeable plates, extending from the top to below the still water level. Blind drain plates are also arranged from the top to below the maximum wave height. This invention can eliminate waves under different wave periods and wave heights in different water depths, improving the applicability and wave-damping performance of the passive wave-damping device, ensuring the accuracy of wave simulation, and reducing reflectivity.

Description

Technical Field

[0001] This invention relates to the fields of port, waterway and coastal engineering and hydrodynamic experimental technology, and in particular to a passive wave-damping experimental device with a composite structure. Background Technology

[0002] With the proposal of the maritime power strategy, research on ports, coastlines, and ship performance has become a hot topic, and research in these fields is inseparable from wave theory and its experimental conditions.

[0003] Wave tanks (water tanks) are one of the main tools for laboratory wave research, and their performance greatly affects the accuracy of experimental data and results. As a component of the experimental tank, the wave-damping device, usually located at the end of the tank, plays a crucial role in improving its performance. Through the interaction between the end wave-damping device and the waves, wave reflection can be effectively reduced. On the one hand, it weakens the wave field turbulence caused by the superposition of reflected and incident waves, which is conducive to forming a more stable target wave field and obtaining more ideal experimental data. On the other hand, the weakening of reflected waves helps to solve the problem of excessively long "waiting time," allowing for faster acquisition of calm wave surfaces for the next set of experiments, improving experimental efficiency and greatly saving valuable time. Although many scholars have studied related passive wave-damping devices, problems such as simple structure, poor wave-damping performance, and large space requirements still exist. While perforated pipe breakwaters can effectively weaken wave energy in all directions and adapt the pipe diameter according to the distribution of wave energy, the perforated pipe structure is simple and the permeability along the pipe remains unchanged, and the damping along the pipe does not change. This makes it difficult for unbroken waves to weaken further after entering the pipe, thus affecting the wave dissipation effect.

[0004] As research in related fields deepens and the accuracy requirements for wave simulation continue to increase, existing single wave-damping devices can no longer meet these requirements. Therefore, it is necessary to propose a passive wave-damping device with a composite structure to meet the current stringent experimental conditions and ensure the wave-damping quality of the test tank (pool). Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and propose a composite passive wave-damping experimental device suitable for test tanks or pools. This device can eliminate waves under different wave periods and wave heights in different water depths, improves the applicability and wave-damping performance of passive wave-damping devices, ensures the simulation accuracy of waves, and reduces reflectivity.

[0006] This invention is achieved through the following technical solution:

[0007] A passive wave-damping experimental device with a composite structure includes a water tank containing experimental water. A supporting frame is fixed to the bottom plate of the water tank. A triangular wave-damping net composed of equilateral triangular prism basic units and covered with stainless steel wire mesh is provided at the front end of the supporting frame. Multiple rows of inclined porous permeable plates are longitudinally fixed to the supporting frame through connecting rods arranged at equal intervals on the upper and lower ends. At least three layers of horizontal plates are respectively provided between the porous permeable plates from the top to below the static water level. Blind drain plates are also respectively provided between the porous permeable plates from the top to below the maximum wave height.

[0008] The porous permeable plates are arranged in 10 rows at equal intervals of 40cm along the direction of wave propagation. The holes in each row of porous permeable plates are arranged from front to back with the permeability decreasing sequentially, and the hole diameter is decreasing sequentially between 10cm and 1cm.

[0009] The porous permeable plate is made of aluminum alloy and is tilted at an angle of 45 degrees.

[0010] The basic unit of the equilateral triangular prism is composed of a stainless steel triangular frame with a side length of 50cm; the mesh of the stainless steel wire mesh is composed of diamond-shaped mesh with a side length of 1cm.

[0011] The horizontal plate is set between the second to the seventh row of the porous permeable plate; the heights of the three horizontal plates from bottom to top are 60cm, 80cm and 100cm respectively.

[0012] The blind drain plate is composed of a porous mesh structure and is set between the fourth and seventh rows of the porous permeable plate, overlapping with the horizontal plate; the upper end of the blind drain plate is located at an elevation of 120cm.

[0013] The water tank is 2m wide and 2m deep, the test water depth is 1m, and the maximum wave height of the test water waves is 0.15m.

[0014] The beneficial effects of this invention are as follows: This invention can eliminate waves under different wave periods and wave heights in different water depths, improving the applicability and wave-dissipating performance of passive wave-damping devices. First, when waves propagate to the wave-damping device, they interact with the triangular wave-damping net arranged at the front of the device. Under the guidance of the triangular wave-damping net 3, the waves gather towards the concave areas of the net surface, resulting in breakup and energy dissipation. Second, the arrangement of the horizontal plates significantly affects the vertical movement of waves, and the blind drain plate, due to its unique porous mesh structure, provides significant damping for waves passing through. The combined effect of these two factors causes a substantial attenuation of wave energy within the combined wave-damping area of ​​the horizontal plates and the blind drain plate. Finally, the multi-layered variable-diameter inclined perforated plates serve as the main skeleton structure of the device. Larger-diameter perforated plates are installed in the front row to improve the device's permeability and reduce reflections caused by direct collisions with the front perforated plates. Smaller-diameter perforated plates are installed in the rear row to enhance the interaction between the structure and the waves, thereby increasing turbulent energy dissipation. Meanwhile, the orifice plate is tilted at a 45-degree angle, combining the advantages of both horizontal and vertical orifice plates. It dissipates wave kinetic energy horizontally and wave potential energy vertically. Furthermore, the device can be modularly designed as a basic unit to adapt to test tanks or pools of different sizes. The number of horizontal plate layers can be adjusted according to the test water depth and wave conditions, and the orifice diameter, number, and spacing can also be adjusted according to different wave conditions, making it highly flexible and versatile. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure;

[0017] Figure 3 yes Figure 1 Schematic diagram of the structure of the porous permeable plate;

[0018] Figure 4 yes Figure 1 Schematic diagram of the structure of a single-layer blind drain plate;

[0019] Figure 5 yes Figure 1 A schematic diagram of the planar structure of the triangular wave-damping net;

[0020] Figure 6 yes Figure 1 Schematic diagram of the basic unit structure of a medium-sided triangular prism;

[0021] Attached reference numerals: 1 Connecting rod; 2 Perforated permeable plate; 3 Triangular wave-damping net; 4 Blind drain plate; 5 Horizontal plate; 6 Wave; 7 Static water level line; 8 Water tank; 9 Hole. Detailed Implementation

[0022] The invention will be further described below with reference to the accompanying drawings:

[0023] As attached Figure 1-6 As shown, a passive wave-damping experimental device with a composite structure includes a water tank 8 containing experimental water. A support frame is fixed to the bottom plate of the water tank 8. The support frame is a stainless steel frame structure, modularly designed. Its length, width, and height are determined according to the size of the water tank, water depth requirements, and wave requirements. Its purpose is to support all components of the wave-damping device and ensure the stability of the entire device during wave testing, while also facilitating modular installation. At the front end of the support frame, a triangular wave-damping mesh 3 is provided, composed of equilateral triangular prism basic units connected together and covered with a stainless steel wire mesh. The equilateral triangular prism basic units are composed of stainless steel triangular frames with a side length of 50cm. The stainless steel wire mesh has diamond-shaped meshes with a side length of 1cm. It is positioned at the very front of the support frame and fixed to the support frame at the rear by screws. The width and height of the triangular wave-damping mesh 3 are consistent with the support frame.

[0024] The support frame is longitudinally fixedly connected to multiple rows of inclined perforated water-permeable plates 2 through connecting rods 1 arranged at equal intervals on the upper and lower ends. The perforated water-permeable plates 2 are made of aluminum alloy and are inclined at an angle of 45 degrees.

[0025] The porous permeable plate 2 of this invention is arranged in 10 rows at equal intervals of 40cm along the propagation direction of the wave 6. The perforations 9 in each row of the porous permeable plate 2 are arranged from front to back with decreasing permeability, wherein the diameter of the perforations 9 decreases sequentially from 10cm to 1cm. The front row has larger perforated plates to increase their permeability and reduce reflections caused by direct collisions with the plates in the front row. The rear row has smaller perforated plates to enhance the interaction between the structure and the waves, improving turbulent energy dissipation. Each plate is hinged to the supporting frame to form a whole. The dimensions of the porous permeable plate 2 should be adapted to the supporting frame.

[0026] In this invention, at least three layers of horizontal plates 5 are respectively arranged between the porous permeable plates 2, extending from the top to below the static water level 7. The horizontal plates 5 are made of PVC rigid plastic. In this embodiment, the horizontal plates 5 are arranged between the second to seventh rows of the porous permeable plates 2. The heights of the three layers of horizontal plates 5 from bottom to top are 60cm, 80cm, and 100cm. Blind drain plates 4 are also arranged between the porous permeable plates 2, extending from the top to below the maximum wave height 6. The blind drain plates 4 are composed of a porous mesh structure. In this embodiment, they are arranged between the fourth to seventh rows of the porous permeable plates 2, overlapping with the horizontal plates 5. The upper surface of the blind drain plates 4 is located at an elevation of 120cm. The width of the blind drain plates 4 should be consistent with the supporting frame, and the height should not be lower than the maximum wave height 6.

[0027] The water tank 8 of the present invention has a width of 2m and a depth of 2m, the test water depth is 1m, and the maximum wave height of the test water wave 6 is 0.15m.

[0028] The wave-damping principle of the technical solution of this invention is as follows:

[0029] (1) When wave 6 propagates to the wave-damping device, it first interacts with the triangular wave-damping net 3. Under the guidance of the triangular wave-damping net 3, it gathers in the concave part of the net surface and breaks up, dissipating energy. At the same time, due to the large porosity of the net surface, the undissipated waves can continue to propagate to the rear of the device, so as not to directly cause obvious primary reflection.

[0030] (2) After passing through the triangular wave-damping net 3, the energy of wave 6 is attenuated to a certain extent and enters the combined wave-damping area of ​​the horizontal plate 5 and the blind drain plate 4. Since the water particles in wave 6 have circular or elliptical motion trajectories, the arrangement of the horizontal plate can effectively suppress the vertical motion of the wave, thereby achieving the purpose of consuming wave energy. Due to its unique porous mesh structure, the blind drain plate 4 will be subject to a large damping effect when wave 6 passes through, thus weakening the wave energy.

[0031] (3) The multi-layered variable-diameter inclined perforated plate serves as the main structure of the device, consisting of multiple porous permeable plates 2 with different aperture sizes and an inclination angle of 45 degrees. Larger aperture perforated plates are installed in the front row to improve the device's permeability and reduce reflections caused by direct collisions with the front row plates. Smaller aperture perforated plates are installed in the rear row to enhance the interaction between the structure and the waves, thereby increasing turbulent energy dissipation. Simultaneously, the 45-degree inclination angle of the perforated plates combines the advantages of both horizontal and vertical plates, dissipating wave kinetic energy horizontally and potential energy vertically.

Claims

1. A passive wave-damping experimental device with a composite structure, characterized in that, The system includes a water tank (8) containing experimental water. The bottom plate of the water tank (8) is fixed with a support frame. The front end of the support frame is provided with a triangular wave-damping net (3) composed of equilateral triangular prism basic units and covered with stainless steel wire mesh. The support frame is longitudinally fixed with multiple rows of inclined porous permeable plates (2) through connecting rods (1) arranged at equal intervals on the upper and lower ends. Between the porous permeable plates (2), at least three layers of horizontal plates (5) are respectively provided from the top to below the static water level (7). Between the porous permeable plates (2), blind drain plates (4) are also respectively provided from the top to below the maximum wave height of the water wave (6).

2. The passive wave-damping experimental device with a composite structure according to claim 1, characterized in that, The porous permeable plate (2) is arranged in 10 rows at equal intervals of 40cm along the direction of wave (6) propagation. The holes (9) of each row of porous permeable plate (2) are arranged from front to back with the permeability decreasing from large to small. The hole diameter of the hole (9) is decreasing from 10cm to 1cm.

3. The passive wave-damping experimental device with a composite structure according to claim 1, characterized in that, The porous permeable plate (2) is made of aluminum alloy and is tilted at an angle of 45 degrees.

4. The passive wave-damping experimental device with a composite structure according to claim 1, characterized in that, The basic unit of the equilateral triangular prism is composed of a stainless steel triangular frame with a side length of 50cm; the mesh of the stainless steel wire mesh is composed of diamond-shaped mesh with a side length of 1cm.

5. The passive wave-damping experimental device with a composite structure according to claim 1, characterized in that, The horizontal plate (5) is set between the second and seventh rows of the porous permeable plate (2); the heights of the three horizontal plates (5) from bottom to top are 60cm, 80cm and 100cm respectively.

6. The passive wave-damping experimental device with a composite structure according to claim 1, characterized in that, The blind drain plate (4) is composed of a porous mesh structure and is set between the fourth and seventh rows of the porous permeable plate (2), overlapping with the horizontal plate (5); the upper end of the blind drain plate (4) is located at an elevation of 120cm.

7. The passive wave-damping experimental device with a composite structure according to claim 1, characterized in that, The water tank (8) is 2m wide and 2m deep, the experimental water depth is 1m, and the maximum wave height of the water wave (6) is 0.15m.

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