A test basin for suppressing low frequency oscillations

Abstract

The application discloses a test pool for inhibiting low-frequency oscillation, which comprises a pool main body, a wave maker and a wave absorbing beach. The wave maker is arranged in the pool main body and is used for generating waves in the pool main body. The pool main body comprises a shoal area. The wave absorbing beach is arranged in the shoal area and faces the wave maker. The wave absorbing beach is a non-solid structure with pores. A solid back plate is arranged on the side of the wave absorbing beach which is opposite to the wave maker. The solid back plate covers the side of the wave absorbing beach. A lifting plate is arranged at the bottom of the pool main body. The wave absorbing beach can change the placement position in the direction of approaching or moving away from the wave maker, so as to change the distance from the wave maker to the wave absorbing beach. The lifting plate can be lifted to change the depth of the pool main body. In the scheme, the solid back plate on the back side of the wave absorbing beach can block the waves, so that the length of the pool main body can be adjusted by moving the position of the wave absorbing beach, and then the inherent oscillation period of the pool main body is adjusted, and the interference of the inherent oscillation period of the pool on the test is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wave-damping experimental devices, and particularly relates to a test pool for suppressing low-frequency oscillation. BACKGROUND

[0002] The test pool is a marine environment simulation device used in a laboratory, which can realize the functions of wind generation, wave generation and current generation by controlling parameters such as water flow and wind force, so as to simulate the influence of real marine environment on islands and floating structures. For example, in the field of island development, the test pool can simulate marine dynamic environment such as wave, tide, storm surge and nearshore current, so as to test the stability of island shoreline protection structures (such as breakwaters) under different wave conditions. For another example, in the field of self-vibration period research of floating structures, the test pool can make the floating structures produce multi-degree-of-freedom responses such as heave, roll and pitch under free vibration or forced vibration, so as to determine the inherent self-vibration period of the floating structures, and meanwhile, the coupling relationship between the structure self-vibration period and the external excitation period can be simulated by adjusting the wave period and flow velocity, so as to verify whether there is resonance risk. In addition, the test pool can test the influence of different structure designs (such as the column spacing of a semi-submersible platform, the length-width ratio of a ship-shaped structure and the liquid tank layout of an LNG floating tank) on the self-vibration characteristics, so as to provide data support for optimizing parameters such as structure stiffness, gravity center position and draft depth, and finally ensure the vibration safety and stability of the structure in complex marine environment in practical application.

[0003] In practical application, as a closed or semi-closed water system, the test pool has inherent periods of free oscillation due to inertia and boundary reflection after the external disturbance (such as wave generation and model movement) disappears. The size is mainly related to the geometric parameters (length, width and water depth) of the pool. When the self-vibration period of the floating structure is close to the inherent oscillation period of the pool, the water oscillation and the structure vibration are mutually reinforced to produce a false resonance phenomenon, so that the vibration amplification effect observed in the test is disturbed by the boundary constraint of the pool, and thus the inherent characteristics of the structure in real marine environment cannot be reflected.

[0004] In order to reduce the disturbance of the inherent oscillation period of the pool to the test, the existing test pool has a limitation on the size of the floating structure, so as to ensure that the size of the pool is much larger than the size of the floating structure, which makes the applicability of the test pool low. SUMMARY

[0005] Therefore, the present application aims to provide a test pool for suppressing low-frequency oscillation, so as to improve the applicability of the test pool and reduce the disturbance of the inherent oscillation period of the pool to the test.

[0006] To achieve the above technical purpose, the present application provides a test pool for suppressing low-frequency oscillation, comprising a pool main body, a wave generator and a wave-damping beach.

[0007] The wave generator is arranged in the pool body to generate waves in the pool body;

[0008] The pool body comprises a shoal area;

[0009] The wave-damping shoal is arranged in the shoal area and faces the wave generator;

[0010] The wave-damping shoal is a non-solid structure with pores;

[0011] The side of the wave-damping shoal opposite to the wave generator is provided with a solid back plate;

[0012] The solid back plate covers the side of the wave-damping shoal;

[0013] The bottom of the pool body is provided with a lifting plate;

[0014] The wave-damping shoal can change the placement position in the direction close to or away from the wave generator to change the distance between the wave generator and the wave-damping shoal;

[0015] The lifting plate can be lifted to change the depth of the pool body.

[0016] Further, the solid back plate covers the top surface of the wave-damping shoal.

[0017] Further, the two sides of the wave-damping shoal in the length direction abut against the inner wall of the pool body.

[0018] Further, the pool body comprises a deep water area;

[0019] The lifting plate is arranged in the deep water area;

[0020] The wave-damping shoal can be placed at the edge of the shoal area close to the deep water area to separate the deep water area and the shoal area.

[0021] Further, a slope is arranged in the pool body;

[0022] The slope is arranged between the shoal area and the deep water area, and the slope connects the bottom of the shoal area and the bottom of the deep water area.

[0023] Further, the slope has an angle of 30° to 60°.

[0024] Further, a damping member is further included;

[0025] The damping member is placed in the shoal area and located between the wave-damping shoal and the wave generator.

[0026] Further, the height of the damping member is less than the water depth of the shoal area.

[0027] Further, the damping member comprises a plurality of.

[0028] Further, the plurality of damping members can be arranged in a side-by-side state, a submerged state or an exposed state.

[0029] In the side-by-side state, the plurality of damping members are laid side by side along the width direction of the wave dissipation shoal.

[0030] In the submerged state, the plurality of damping members are stacked along the vertical direction, and the stacking height of the plurality of damping members is less than the water depth of the shoal area.

[0031] In the exposed state, the plurality of damping members are stacked along the vertical direction, and the stacking height of the plurality of damping members is greater than the water depth of the shoal area.

[0032] Further, the damping member is internally hollowed into a damping net structure.

[0033] Further, the length of the damping member is 4-6m.

[0034] The width of the damping member is 1-2m.

[0035] The height of the damping member is 0.3-0.5m.

[0036] As can be seen from the above technical solutions, the application provides a test pool for suppressing low-frequency oscillation, comprising: a pool body, a wave maker and a wave dissipation shoal; the wave maker is arranged in the pool body and is used for generating waves in the pool body; the pool body comprises a shoal area; the wave dissipation shoal is placed in the shoal area and faces the wave maker; the wave dissipation shoal is a non-solid structure with pores; a solid back plate is arranged on the side of the wave dissipation shoal opposite to the wave maker; the solid back plate covers the side surface of the wave dissipation shoal; a lifting plate is arranged at the bottom of the pool body; the wave dissipation shoal can change the placement position in the direction of approaching or moving away from the wave maker, so as to change the distance between the wave maker and the wave dissipation shoal; the lifting plate can be lifted to change the depth of the pool body.

[0037] In the present scheme, the solid back plate on the back side of the wave dissipation shoal can block the waves, so that the length of the pool body can be adjusted by moving the position of the wave dissipation shoal, and then the natural oscillation period of the pool body is adjusted to avoid the natural vibration period of the test structure or to verify the stability of the data through multiple comparison tests, thereby improving the accuracy of the test and reducing the interference of the natural oscillation period of the pool on the test. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0039] Figure 1 A side view of a test pool for suppressing low-frequency oscillation provided by an embodiment of the present application;

[0040] Figure 2 A top view of a test pool for suppressing low-frequency oscillation provided by an embodiment of the present application;

[0041] Figure 3 A side view of a test pool for suppressing low-frequency oscillation provided by an embodiment of the present application, in which the wave-breaking beach is moved to the edge of the shallow beach area;

[0042] Figure 4 A side view of a test pool for suppressing low-frequency oscillation provided by an embodiment of the present application, in which a slope is arranged;

[0043] Figure 5 A side view of a test pool for suppressing low-frequency oscillation provided by an embodiment of the present application, in which a damping member is arranged;

[0044] Figure 6 A schematic view of a test pool for suppressing low-frequency oscillation provided by an embodiment of the present application, in which the damping members are in a side-by-side state;

[0045] Figure 7 A schematic view of a test pool for suppressing low-frequency oscillation provided by an embodiment of the present application, in which the damping members are in a stacked state;

[0046] Figure 8 A time-frequency graph of manufacturing two groups of waves in a case where a test pool does not use damping members provided by an embodiment of the present application;

[0047] Figure 9 A frequency superposition graph of manufacturing two groups of waves in a case where a test pool does not use damping members provided by an embodiment of the present application;

[0048] Figure 10 A time-frequency graph of manufacturing two groups of waves in a case where a test pool for suppressing low-frequency oscillation provided by an embodiment of the present application is configured with damping members;

[0049] Figure 11 A frequency superposition graph of manufacturing two groups of waves in a case where a test pool for suppressing low-frequency oscillation provided by an embodiment of the present application is configured with damping members;

[0050] In the figure: 10, pool body; 11, shallow area; 12, deep water area; 13, lifting plate; 14, slope; 20, wave maker; 30, wave absorbing beach; 31, solid back plate; 40, damping member. DETAILED DESCRIPTION

[0051] The technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0052] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0053] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be replaceably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] Please refer to Figure 1 With Figure 2 The test pool for suppressing low-frequency oscillation provided in the embodiments of the present application comprises a pool body 10, a wave maker 20 and a wave absorbing beach 30.

[0055] The wave maker 20 is arranged in the pool body 10 and is used to generate waves in the pool body 10. In application, the wave maker 20 can be a rocking plate wave maker or a push plate wave maker. The pool body 10 comprises a shallow area 11. The wave absorbing beach 30 is placed in the shallow area 11 and faces the wave maker 20. In order to facilitate the description, in the embodiments of the present application, the pool body 10 is configured as a rectangular structure in the top view. In the horizontal direction, the length side of the pool body 10 is the first direction, and the width side is the second direction. The first direction and the second direction are perpendicular to each other, and respectively as Figure 2The X-axis direction and the Y-axis direction are shown in FIG. 1. In this embodiment, the wave generator 20 and the wave dissipation beach 30 are arranged on both sides of the pool body 10 along the first direction. In this embodiment, the side of the wave dissipation beach 30 facing the wave generator 20 is the front side of the wave dissipation beach 30; correspondingly, the side of the wave dissipation beach 30 facing away from the wave generator 20 is the back side of the wave dissipation beach 30.

[0056] The wave dissipation beach 30 is a non-solid structure with pores to simulate the gentle slope beach in nature, so that the wave contacting the wave dissipation beach gradually breaks and dissipates energy during propagation, reducing wave reflection or impact. The side of the wave dissipation beach 30 facing away from the wave generator 20 is provided with a solid back plate 31, that is, the back side of the wave dissipation beach 30 is provided with the solid back plate 31, and the solid back plate 31 covers the back side of the wave dissipation beach 30; the bottom of the pool body 10 is provided with a lifting plate 13; the wave dissipation beach 30 can change the placement position in the direction close to or away from the wave generator 20 to change the distance between the wave generator 20 and the wave dissipation beach 30; the lifting plate 13 can be lifted to change the depth of the pool body 10.

[0057] As an embodiment, only the shoal area 11 can be arranged in the pool body 10 to simulate a shallow water environment and reproduce the action of sea waves in the nearshore and shoal area. The depth of the shoal area 11 can be 1-3 m.

[0058] As an embodiment, the wave dissipation beach 30 can be a trapezoidal structure, specifically a right trapezoid, and the back side of the wave dissipation beach 30 is a right angle side of the trapezoid.

[0059] In this embodiment, the front end of the wave dissipation beach 30 can attenuate the incident wave energy, and the non-solid structure can avoid strong reflection of the wave due to sudden obstruction. The solid back plate 31 arranged at the back end of the wave dissipation beach 30 can form a closed boundary to prevent the wave from passing through the wave dissipation beach 30. Therefore, the solid back plate 31 in this embodiment can play the role of the pool boundary.

[0060] In practical applications, the natural periods of semi-submersible platforms, ship-shaped structures, LNG floating tanks and other floating structures are widely distributed, about 25-125 s. When these structures are placed in a test pool for physical model test, the natural period is about 5-40 s. When the natural period of the floating structure is close to the oscillation period of the pool, the above-mentioned false resonance response will occur, resulting in test failure. In this embodiment, the staff can change the length of the pool body 10 along the first direction by moving the wave dissipation beach 30, thereby changing the natural oscillation frequency of the pool body 10 to avoid the key frequency of the test, avoid resonance and interference, or perform multiple comparison tests after changing the size of the pool to verify the stability of the data, thereby reducing the influence of the natural oscillation frequency on the test.

[0061] Meanwhile, the lifting plate 13 arranged in the pool body 10 can change the depth of the pool body 10, so as to change the oscillation period of the pool body 10 in the way of changing the depth of the pool, and increase the adjustment range of the oscillation period of the pool body 10 in the way of moving the beach 30, so as to improve the applicability of the pool. Wherein, the way of calculating the oscillation period of the pool by changing the depth of the pool body 10 and moving the beach 30 is the prior art, and therefore is not described in detail in the embodiment.

[0062] In general, the test pool provided in the embodiment can suppress low-frequency oscillation, and the beach 30 can continuously play the wave-damping role through the pore structure at the front end, and can be used as the boundary of the pool through the solid back plate 31 arranged at the back, so as to directly change the effective length of the pool by moving the placement position of the beach 30, and cooperate with the lifting plate 13. The test pool provided in the embodiment realizes the combination of the wave-damping function and the length / depth adjustment function, and realizes the dynamic adjustment of the geometric parameters of the pool through simple operation. Moreover, for small models or high-frequency tests, the utilization rate of the pool space can be improved by shortening the length of the pool.

[0063] As an embodiment, the beach 30 and the wave maker 20 can be arranged on the two sides of the pool body 10 along the second direction respectively.

[0064] As an embodiment, in order to ensure the wave-damping effect of the beach 30 and the boundary effect of the solid back plate 31, the two sides of the beach 30 along the length direction abut against the inner wall of the pool body 10.

[0065] In one embodiment, the solid back plate 31 also covers the top surface of the beach 30.

[0066] Specifically, in application, the top surface of the beach 30 is exposed to the water surface of the shallow beach area 11. The back surface and the top surface of the solid back plate 31 both cover the beach 30, which can enhance the overall stiffness of the beach 30, improve the wave-damping efficiency, and ensure the adjustment accuracy of the effective length of the pool.

[0067] In one embodiment, please refer to Figures 1 to 3 The pool body 10 comprises a deep water area 12; the lifting plate 13 is arranged in the deep water area 12; the beach 30 can be placed at the edge of the shallow beach area 11 close to the deep water area 12, so as to separate the deep water area 12 and the shallow beach area 11.

[0068] In this embodiment, the shoal area 11 is of fixed depth. The deep water area 12 can be adjusted in depth by the position of the lifting plate 13 to adapt to different test conditions. Specifically, the lifting plate 13 can be raised to be flush with the shoal area 11, at which time the pool main body 10 forms a structure of an entire shoal area. The lifting plate 13 can also be lowered to form a height difference with the shoal area 11, so that the deep water area 12 and the shoal area 11 form a difference in water level depth, to simulate the depth variation of the coast from deep to shallow, and to adjust the depth difference between the deep water area 12 and the shoal area 11 by the lifting plate 13.

[0069] In this embodiment, the wave-breaking beach 30 can also be moved to the edge of the shoal area 11, as shown in Figure 3 Due to the boundary isolation effect of the solid back plate 31 on the wave-breaking beach 30, the deep water area 12 and the shoal area 11 are separated, so that the pool can be used for separate tests in deep water and shallow water environments.

[0070] It should be noted that in actual applications, the way to move the wave-breaking beach 30 to the placement position can be, for example, by a traction device on the bank of the pool, which belongs to the prior art, and therefore will not be described in this embodiment.

[0071] In one embodiment, referring to Figure 4 , a slope 14 is arranged in the pool main body 10; the slope 14 is arranged between the shoal area 11 and the deep water area 12, and the slope 14 connects the bottom of the shoal area 11 and the bottom of the deep water area 12.

[0072] In applications, the slope 14 can have a slope of 30° to 60° to avoid excessive occupation of the use area of the deep water area 12 by the slope 14.

[0073] In applications, the slope 14 can be configured to be flush with the shoal area 11 when the lifting plate 13 is lowered to the bottommost position, to achieve a gentle transition. As an implementation, the slope 14 is a triangular columnar block that can be disassembled and transferred.

[0074] By arranging the slope 14, the discontinuous surface at the transition position of the deep water area 12 and the shoal area 11 can be eliminated to prevent the quality of the waves from being reduced, and the risk of uncontrollable waves can be reduced.

[0075] In one embodiment, referring to Figure 5 , a damping member 40 is further included; the damping member 40 is placed in the shoal area 11 and located between the wave-breaking beach 30 and the wave maker 20.

[0076] The damping member 40 arranged in the shoal area 11 can consume the energy of water body oscillation in a frictional and energy dissipating manner to improve the stability of the waves and inhibit the occurrence of wave reflection and low-frequency oscillation waves in the pool.

[0077] As an implementation, the interior of the damping member 40 is a hollow energy dissipation net structure, so as to dissipate the kinetic energy of the wave by using the friction, turbulence, diversion and pressure change of the net pores when the wave passes.

[0078] In an embodiment, the height of the damping member 40 is less than the water depth of the shoal area 11.

[0079] Specifically, as an implementation, the damping member 40 includes multiple, the length of the damping member 40 can be 4-6m; the width of the damping member 40 can be 1-2m; the height of the damping member 40 can be 0.3-0.5m. And in actual application, the staff can arrange the length of the damping member 40 according to the needs; for example, the damping member 40 is arranged along the second direction to abut the inner wall of the pool body 10.

[0080] In this embodiment, since the height of the damping member 40 is less than the water depth of the shoal area 11, when the damping member 40 is arranged in a single-layer structure, the damping member 40 can be completely submerged below the water surface. So that the damping member 40 can be configured not to contact the water surface, to reduce the reflection of the wave caused by the collision of the wave with the structural surface of the damping member 40, while not affecting the wave energy entering the damping area.

[0081] In an embodiment, multiple damping members 40 can be arranged in a side-by-side state, a submerged state or an exposed state; in the side-by-side state, multiple damping members 40 are laid side by side along the width direction of the wave dissipation beach 30; in the submerged state, multiple damping members 40 are stacked along the vertical direction, and the stacking height of multiple damping members 40 is less than the water depth of the shoal area 11; in the exposed state, multiple damping members 40 are stacked along the vertical direction, and the stacking height of multiple damping members 40 is greater than the water depth of the shoal area 11.

[0082] Specifically, in the side-by-side state, multiple damping members 40 are arranged along the first direction, as shown in Figure 6 Arranging the damping member 40 into a multi-row parallel structure can achieve multi-stage energy dissipation of the wave, break the regular propagation path of the reflected wave, and improve the energy dissipation efficiency and reduce the risk of forming a turbulent area behind the damping member 40.

[0083] In the submerged state, the damping member 40 is arranged in a multi-layer structure and is still below the water surface, as shown in Figure 7 Since the energy of the wave in the water is not uniformly distributed, but presents a certain attenuation law with depth, arranging the damping member 40 in multiple layers can dissipate the wave energy of each layer, and allow the staff to adjust the number of layers of the damping member 40 according to the experimental conditions, to enhance the adaptability to different test conditions.

[0084] In the exposed state, the damping member 40 is also a multi-layer structure and extends above the water surface of the shoal area 11. In this state, the energy transmission and interference of the targeted test waves in the water surface and the near water surface area can be tested, the wave absorbing frequency is widened, and the control ability of the complex wave phenomenon is tested.

[0085] It should be noted that in the above state, different states can be superimposed on each other. For example, a plurality of damping members 40 are arranged in the side-by-side state and the exposed state at the same time.

[0086] In actual application, please refer to Figure 8 In the case where the damping member 40 is not arranged, the wave heights of two groups of waves are recorded and the frequency spectrum is analyzed within 0-650s. The specific process is that after the first group of waves (0-300s) is generated, it is stopped for 50s, and then the second group of waves (350-650s) is generated under the same working condition. In this case, the 0-650s wave height data graph continuously observed at the center of the deep water area 12 is as shown in FIG. 6. Figure 8 The frequency spectrum analysis is performed on the wave height observation data of the first group (0-300s) and the second group (350-650s) respectively, and the frequency-spectrum superimposed graph of the two groups of waves is as shown in FIG. 7. Figure 9 Figure 9 The solid line in the figure represents the spectrum value of the first group of waves, and the dashed line represents the spectrum value of the second group of waves. As can be seen from the figure, the spectrum area difference value of the first group of waves and the second group of waves is 7.3%, the frequency difference of the two groups of waves is large, and the wave stability is low, that is, the wave field formed at this time is a low-stability wave field prone to oscillation effect.

[0087] Please refer to Figure 10 In the case where the damping member 40 is arranged and the damping member 40 is in the submerged state, the wave heights of two groups of waves are recorded and the frequency spectrum is analyzed within 0-650s. The working conditions and duration of the two groups of waves are consistent with the case in Figure 8 , that is, after the first group of waves (0-300s) is generated, it is stopped for 50s, and then the second group of waves (350-650s) is generated under the same working condition. In this case, the 0-650s wave height data graph continuously observed at the center of the deep water area 12 is as shown in FIG. 8. Figure 10 The frequency spectrum analysis is performed on the wave height observation data of the first group (0-300s) and the second group (350-650s) respectively, and the frequency-spectrum superimposed graph of the two groups of waves is as shown in FIG. 9. Figure 11 The solid line in the figure represents the spectrum value of the first group of waves, and the dashed line represents the spectrum value of the second group of waves. As can be seen from the figure, the area difference value of the first group of waves and the second group of waves is 1.52%, which indicates that the frequency difference of the two groups of waves is small, and the wave stability is high, that is, the wave field formed at this time is a high-quality wave field capable of suppressing oscillation effect.​

[0088] Therefore, through the comparison of the above experiments, it can be seen that, in the embodiments provided in the present application, the wave making performance of the test pool can be effectively improved and the wave making stability can be improved by setting the damping member.

[0089] The above are preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the examples, those skilled in the art can modify the technical solutions recorded in the foregoing examples or make equivalent replacements to some of the technical features, but any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A test water tank for suppressing low-frequency oscillations, characterized in that, include: The main body of the pool (10), wave generator (20), breakwater (30) and damping components (40); The wave generator (20) is installed in the main body of the pool (10) and is used to generate waves within the main body of the pool (10); The main body of the pool (10) includes a shallow beach area (11); The breakwater (30) is placed in the shallow water area (11) and is directly opposite the wave generator (20). The breakwater (30) has a solid backplate (31) on the side opposite to the wave generator (20). The solid backplate (31) covers the sides and top of the breakwater (30); A lifting plate (13) is provided at the bottom of the main body (10) of the pool. The breakwater (30) can change its placement position in the direction of approaching or moving away from the wave generator (20) to change the distance between the wave generator (20) and the breakwater (30); The lifting plate (13) can be raised and lowered to change the depth of the main body of the pool (10); The damping element (40) is placed in the shallow area (11) and is located between the wave-dissipating beach (30) and the wave generator (20); The height of the damping element (40) is less than the water depth of the shallow water area (11); The damping element (40) includes a plurality of damping elements (40), which can be arranged in a side-by-side state, a submerged state or an exposed state. In the parallel arrangement, multiple damping elements (40) are laid side by side along the width direction of the breakwater (30); In the submerged state, multiple damping elements (40) are stacked vertically, and the stacking height of the multiple damping elements (40) is less than the water depth of the shallow area (11). In the exposed state, multiple damping elements (40) are stacked vertically, and the stacking height of the multiple damping elements (40) is greater than the water depth of the shallow water area (11). The damping element (40) has a hollow energy dissipation mesh structure inside.

2. The test water tank for suppressing low-frequency oscillations according to claim 1, characterized in that, The breakwater (30) abuts against the inner wall of the main body of the pool (10) on both sides along its length.

3. The test water tank for suppressing low-frequency oscillations according to claim 1, characterized in that, The main body of the pool (10) includes a deep water area (12); The lifting plate (13) is located in the deep water area (12); The breakwater (30) can be placed at the edge of the shallow water area (11) near the deep water area (12) to separate the deep water area (12) from the shallow water area (11).

4. The test water tank for suppressing low-frequency oscillations according to claim 3, characterized in that, The main body (10) of the pool is equipped with a ramp (14). The ramp (14) is located between the shallow water area (11) and the deep water area (12), and the ramp (14) connects the bottom of the shallow water area (11) and the bottom of the deep water area (12).

5. The test water tank for suppressing low-frequency oscillations according to claim 4, characterized in that, The slope of the slope (14) is 30° to 60°.

6. The test water tank for suppressing low-frequency oscillations according to claim 4, characterized in that, The ramp (14) is a triangular prism block that can be disassembled.

7. The test water tank for suppressing low-frequency oscillations according to claim 1, characterized in that, The breakwater (30) is a non-solid structure with pores.

8. The test water tank for suppressing low-frequency oscillations according to claim 1, characterized in that, The length of the damping element (40) is 4-6m; The width of the damping element (40) is 1-2m; The height of the damping element (40) is 0.3-0.5m.

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