Internal wave water tank test system

Abstract

The utility model relates to an internal wave water tank test system, which comprises a water tank body and a control unit, and an internal wave generating unit is arranged on the water tank body. The internal wave generating unit has a stroke moving in the long side direction of the water tank body and a stroke moving in the direction perpendicular to the long side of the water tank body, and internal waves are generated in the water tank body through the internal wave generating unit; and the control unit is electrically connected with the internal wave generation unit to control the movement of the internal wave generation unit. The internal wave water tank test system is suitable for small laboratories, can simulate ocean internal wave phenomena, generates internal waves meeting requirements in the laboratories, observes the internal waves in real time, achieves precise analysis of the internal waves, is low in cost, simple in structure and convenient to use, saves offshore experiment cost, and reduces economic losses.

Description

Technical Field

[0001] The utility model relates to the technical field of wave simulation experiments, in particular to an internal wave water tank test system. Background Art

[0002] Internal waves refer to fluctuations in a body of water caused by density changes, usually between different density layers of the water body. These fluctuations can propagate in the vertical direction and form a fluctuating interface in the water body. Internal waves are usually caused by density differences such as temperature and salinity in the water body, which form different layers in the water body. The study of internal waves is of great significance for a deeper understanding of ocean dynamics, environmental impacts, and related engineering and resource development. Research in this area helps to improve the understanding of the marine system and provide scientific support for environmental protection, rational engineering planning, and sustainable resource utilization.

[0003] Internal wave tanks are basic equipment for internal wave model tests. However, most of the existing wave tanks are built in the direction of medium and large scale, with complex structures. The experimental plan and parameters cannot be changed at will during the experiment, and the experimental cost is high. For small laboratory wave tanks, the characteristics of waves will be quite different. The precise control of regular or irregular waves and wave elimination are all key research contents. Utility Model Content

[0004] Based on this, it is necessary to provide an internal wave water tank test system that can be suitable for small laboratories to address the above technical problems. Through the design of the water tank structure and the internal wave generation unit, combined with the internal wave measurement, the internal wave parameters can be precisely controlled to provide internal waves that meet the requirements for research.

[0005] An internal wave water tank test system comprises a water tank body and a control unit, wherein the water tank body is provided with an internal wave generating unit;

[0006] The internal wave generating unit has a stroke for moving along the long side direction of the water tank body, and has a stroke for moving in the vertical direction of the long side of the water tank body, and the internal wave is generated in the water tank body through the movement of the internal wave generating unit;

[0007] The control unit is electrically connected to the internal wave generating unit to control the movement mode of the internal wave generating unit.

[0008] Compared with the prior art, the internal wave water tank test system provided by the utility model has the following effects:

[0009] 1. It is suitable for small laboratories, can simulate the phenomenon of ocean internal waves, generate internal waves that meet the requirements in the laboratory, and observe the internal waves in real time to achieve precise analysis of internal waves;

[0010] 2. Low cost, simple structure, easy to use, saving the cost of offshore experiments and reducing economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Axonometric diagram of the internal wave tank test system provided by the utility model;

[0012] Figure 2 This is the positive axonometric view of the internal wave generating unit;

[0013] Figure 3 Back axonometric view of the internal wave generating unit;

[0014] Description of reference numerals:

[0015] A water tank body 11, a baffle 111, and a support frame 112;

[0016] Internal wave generating unit 22, wave generating plate 221, horizontal motor 222, horizontal screw rod 223, vertical motor 224, vertical screw rod 225, first limiting rail 2251, second limiting rail 2252, slide 226, cross bar 227, horizontal connecting piece 228, vertical connecting piece 2281. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0018] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] It can be understood that internal waves are waves that propagate in density-stratified fluids. They are characterized by being formed on interfaces with large density changes and propagating upward or downward. Internal waves are usually observed in large-scale water bodies such as oceans and lakes. The generation and propagation of internal waves are of great significance to the study of marine science and fluid mechanics, and are also of great significance in the fields of ocean circulation and mixed layer research, coastal engineering and marine energy research, and underwater acoustics.

[0021] The present invention drives the wave generating plate to move horizontally and vertically by a motor to generate internal waves, which are suitable for research fields related to marine science, fluid mechanics and underwater environment. The wave generating process involves special principles related to the interaction of density stratified fluids.

[0022] The following will describe the implementation of the present invention in detail with reference to the accompanying drawings in the embodiment diagram of the present invention.

[0023] like Figures 1 to 3 As shown, it is a schematic diagram of the structure of the internal wave water tank test system provided in this embodiment, including a water tank body 11 and a control unit 33, and an internal wave generating unit 22 is arranged on the water tank body 11; the internal wave generating unit 22 has a stroke moving along the long side direction of the water tank body 11, and has a stroke moving in the vertical direction of the long side of the water tank body 11, and internal waves are generated in the water tank body 11 through the movement of the internal wave generating unit 22; the control unit 33 is electrically connected to the internal wave generating unit 22 to control the movement mode of the internal wave generating unit 22.

[0024] Specifically, the water tank body 11 is an elongated trough structure with an opening on the upper surface and baffles 111 on the lower surface and four sides, and a length of 6-10 meters. A support frame 112 is arranged around the baffle 111, and the baffles 111 on the lower surface and the sides are supported by the support frame 112. The support frame 112 is a frame structure composed of a plurality of rods. A fixing block is provided at the bottom of the water tank body 11, and the water tank body 11 is leveled or fixed by the fixing block. The fixing block is not shown in the figure. Specifically, the fixing block generally adopts a flange, and half of the flange is fixed on the support frame 112, and the other half is exposed to connect a boss with a threaded auxiliary structure. The boss is used to tighten the water tank body 11 by rotating the thread, and the water tank body 11 is supported from the bottom and squeezed from all sides, so as to achieve the purpose of leveling and fixing the water tank body 11.

[0025] The tail end of the water tank body 11 is provided with an energy dissipation device to eliminate the energy of the arriving internal wave coda as much as possible and to reduce the reflected internal wave energy as much as possible. The baffle 111 is made of a transparent material, preferably transparent PVC, to facilitate observation of the internal wave generation; the baffles 111 are connected by glass glue to prevent the water tank body 11 from leaking. The support frame 112 and the fixing block are made of metal material, preferably stainless steel. More specifically, a fixing plate is also provided at the end of the support frame 112 that contacts the ground, and is fixed to the ground through the fixing plate, and the fixing method can be a threaded connection.

[0026] The internal wave generating unit 22 is arranged at the front end of the water tank body 11, and includes a wave generating plate 221 and a thrust assembly, wherein the thrust assembly includes a lateral thrust assembly and a vertical thrust assembly, wherein the lateral thrust assembly is arranged along the long side direction of the water tank body, the vertical thrust assembly is slidably matched with the lateral thrust assembly, and the arrangement direction is perpendicular to the lateral thrust assembly; the wave generating plate 221 is fixed on the vertical thrust assembly.

[0027] The lateral thrust assembly includes a horizontal motor 222 and a horizontal screw rod 223. There are two horizontal screw rods 223, which are arranged on both sides along the long side direction of the water tank body 11. Specifically, the horizontal screw rod 223 is arranged at the front end of the water tank body 11. A first limiting rail 2251 is provided at the front end of the water tank body 11. The horizontal screw rod 223 is fixed to the water tank body 11 through the first limiting rail 2251. The first limiting rail 2251 is a strip structure matching the length of the horizontal screw rod 223, with a groove in the middle to accommodate the horizontal screw rod 223 to form a screw guide rail, and sliders on both sides. A slide 226 is provided on the first limiting rail 2251. Slide grooves matching the slider are provided on both sides of the slide 226, and a threaded hole matching the diameter of the horizontal screw rod 223 is provided in the middle. The horizontal screw rod 223 is inserted into the threaded hole to form a threaded fit, and the slider is embedded in the slide groove to form a sliding fit. The length of the first limiting rail 2251 is determined according to needs, and the length of the first limiting rail 2251 is used to ensure the maximum distance that the wave generating plate 221 can move along the long side direction of the water tank body 11 .

[0028] There are one or two horizontal motors 222, which are fixed at one end of the horizontal screw rod 223 away from the sink body 11; when there is one horizontal motor 222, one horizontal motor 222 is mechanically connected to two horizontal screw rods 223 at the same time, and the two horizontal screw rods 223 are driven to move by one horizontal motor 222; when there are two horizontal motors 222, the two horizontal motors 222 are mechanically connected to the two horizontal screw rods 223 respectively, and the two horizontal screw rods 223 are driven to move by the two horizontal motors 222 respectively. The figure of this embodiment shows the way in which the two horizontal motors 222 are respectively connected to the two horizontal screw rods 223.

[0029] The vertical thrust assembly includes a vertical motor 224 and a vertical screw 225. There are two vertical screws 225, which are arranged on the horizontal screw 223 along the vertical direction of the long side of the water tank body and slide with the horizontal screw 223. More specifically, the second limiting rail 2252 is vertically fixed on the slide 226 of the horizontal screw 223 by a horizontal connector 228. The second limiting rail 2252 has the same structure as the first limiting rail 2251, except that the middle groove of the second limiting rail 2252 accommodates the vertical screw 225. The length of the second limiting rail 2252 is determined according to the length of the wave generating plate 221, and the depth of the wave generating plate 221 entering the water is ensured by the length of the second limiting rail 2252. The horizontal connecting member 228 includes a horizontal plate, a vertical plate and a supporting inclined plate, wherein the bottom surface of the horizontal plate is fixed on the slide 226, one side surface of the vertical plate is fixed to the second limiting rail 2252 and is flush with the end surface of the second limiting rail 2252, and then the end of the vertical plate flush with the second limiting rail 2252 is fixed to the top surface of the horizontal plate, and the supporting inclined plate is used to connect the horizontal plate and the vertical plate to provide sufficient supporting force for the second limiting rail 2252.

[0030] There are one or two vertical motors 224, which are fixed at the top of the vertical screw rod 225; when there is one vertical motor 224, one vertical motor 224 is mechanically connected to the two vertical screw rods 225 at the same time, and the two vertical screw rods 225 are driven to move by one vertical motor 224; when there are two vertical motors 224, the two vertical motors 224 are mechanically connected to the two vertical screw rods 225 respectively, and the two vertical screw rods 225 are driven to move by the two vertical motors 224 respectively. The figure of this embodiment shows the way in which the two vertical motors 224 are respectively connected to the two vertical screw rods 225.

[0031] The wave generating plate 221 is a rectangular plate-like structure, one end of the long side of which is fixed on the thrust assembly, and the other end is a free end, which can extend into the interior of the water tank body 11. The wave generating plate 221 is located between the two second limiting rails 2252, and is fixed to the slide of the second limiting rail 2252 through the cross bar 227. The cross bar 227 and the second limiting rail 2252 are fixed by a vertical connecting member 2281. The vertical connecting member 2281 is a plate-like structure, and its bottom surface is connected to the slide of the second limiting rail 2252, and its top surface is connected to the cross bar 227. The width of the wave generating plate 221 should be slightly smaller than the width of the water tank body 11, so that it is easy to install and move back and forth, and at the same time leave a gap to allow a small amount of water to pass through to avoid excessive resistance; its width cannot be too smaller than the width of the water tank body 11, otherwise the movement of the water driven by it cannot form suitable waves. Preferably, the width of the wave generating plate 221 is 4-10 mm smaller than the internal width of the water tank body 11. The length of the wave generating plate 221 can be determined according to the amplitude of the internal wave and the power of the motor; when the amplitude of the internal wave is large, the length can be increased, and when the amplitude of the internal wave is small, the length can be reduced; or when the power of the motor can support it, the length can be increased, otherwise, the length can be reduced. The wave generating plate 221 and the cross bar 227 can be fixedly connected, or can be detachably connected as needed. The purpose of the detachable connection is to facilitate the replacement of the model of the wave generating plate 221 according to the needs of wave making. Therefore, its fixing method can adopt a connection method such as a snap or a bolt or a welding or a clamping fixation. It can be understood that since the wave generating plate 221 will encounter greater resistance when moving in the water body, the contact area between the wave generating plate 221 and the cross bar 227 can be increased to ensure a stable connection between the wave generating plate 221 and the cross bar 227; for example, the upper end of the wave generating plate 221 is flush with the upper end of the cross bar 227; or the upper end of the wave generating plate 221 is extended upward beyond the upper end of the cross bar 227 and then fixed to ensure the maximum fixing area of ​​the two.

[0032] It is worth noting that the movement of the wave generating plate 221 should be balanced, otherwise it is easy to get stuck after moving back and forth several times. Therefore, when the horizontal motor 222 and / or the vertical motor 224 are set to two, the two horizontal motors 222 and / or the two vertical motors 224 should be driven synchronously.

[0033] The control unit is not shown in the figure, and mainly includes a motor driver and a power supply. The motor driver is electrically connected to the horizontal motor 222, the vertical motor 224, and the power supply; the motor driver drives the horizontal motor 222 and the vertical motor 224 to perform two-dimensional motion at a given speed and direction according to the received instructions, so as to drive the wave generating plate 221 to move. Specifically, the motor driver includes a horizontal motor driver and a vertical motor driver. In the case of large power, a horizontal motor driver and a vertical motor driver are respectively set; wherein, in the case where the horizontal motor 222 and the vertical motor 224 are set to two, the horizontal motor driver is electrically connected to the two horizontal motors 222, and the vertical motor driver is electrically connected to the two vertical motors 224; or in the case where the motor driver has a small power, two horizontal motor drivers are set, two vertical motor drivers are set, and two horizontal motor drivers are electrically connected to the two horizontal motors 222 and two vertical motor drivers are electrically connected to the two vertical motors 224 respectively. It is worth noting that when the two horizontal motor drivers are electrically connected to the two horizontal motors 222 respectively, the two horizontal motor drivers must synchronously drive the two horizontal motors 222; similarly, when the two vertical motor drivers are electrically connected to the two vertical motors 224 respectively, the two vertical motor drivers must synchronously drive the two vertical motors 224.

[0034] The power supply is electrically connected to the motor driver, the horizontal motor 222 and the vertical motor 224 respectively, and is mainly used to provide electrical energy.

[0035] It is worth noting that the horizontal motor 222 and the vertical motor 224 are high-power servo motors, such as ECMA-C20807RS servo motors; the motor driver can adopt ASD-B2-0721-B motor driver, and the power output voltage is 24V.

[0036] During operation, the wave generating plate 221 is suspended in the water tank body 11. First, the motor driver electrically connected to the horizontal motor 222 drives the horizontal motor 222 at a given rotation speed and number of rotations, and drives the horizontal screw rod 223 to realize positive rotational motion at a given rotation speed, so as to drive the slide of the first limiting track 2251 to move forward, and then drive the wave generating plate 221 to move forward; then, the motor driver electrically connected to the vertical motor 224 drives the vertical motor 224 at a given rotation speed and number of rotations, and drives the vertical screw rod 225 to realize positive rotational motion at a given rotation speed, so as to drive the slide of the second limiting track 2252 to move upward quickly, and then drive the wave generating plate 221 to move upward quickly, thereby generating internal waves.

[0037] Based on the internal wave water tank test system, the internal wave water tank test is carried out, including the following steps:

[0038] Step 1: Place the wave generating plate in the water tank body, and pour two water bodies of different densities and colors into the water tank body to form a layered water body in the water tank body. It can be understood that water bodies of different densities and colors will form a more obvious layered structure. Generally, fresh water and salt water are used, with a transparent fresh water layer with low density in the upper layer and a colored salt water layer with high density in the lower layer. Other liquids can also be used according to the situation.

[0039] Step 2, start the motor driver electrically connected to the lateral thrust assembly, and the motor driver drives the lateral thrust assembly to move forward according to a given rotation speed and number of rotations, thereby driving the wave generating plate to move forward, squeezing the layered water body to form a density potential difference. It can be understood that when squeezing the layered water body, the heights of the two squeezed water layers are increased, thereby forming a density potential difference.

[0040] Step 3, start the motor driver electrically connected to the vertical thrust assembly. The motor driver drives the vertical thrust assembly to move upward at a given rotation speed and number of rotations, so that the wave generating plate is quickly pulled out of the water surface to form internal waves. It can be understood that the speed of upward movement must be fast, so that after the wave generating plate is quickly pulled out, the two layers of water with density potential difference can generate internal waves and propagate forward. Because the two layers of water have different colors, the internal waves can be clearly observed by the naked eye when they propagate. With the help of auxiliary instruments and equipment, internal waves can be accurately measured.

[0041] It can be understood that the wave-generating system and method for the internal wave tank test provided by the present invention have the following characteristics:

[0042] 1. By setting different rotation frequencies and amplitudes to adjust the amplitude, frequency and wavelength of internal waves, internal waves with specific characteristics can be generated according to different research needs. Various complex internal wave environments can be simulated, providing important support for experimental research in the fields of marine engineering, wave resistance of structures, and internal wave energy utilization, and is suitable for different experimental needs or research purposes.

[0043] 2. Driven by a motor, the internal wave can be generated stably and continuously, with stability and controllability.

[0044] 3. By setting the rotation frequency and amplitude, internal waves with the same characteristics can be repeatedly generated, which is of great significance for experimental comparison and result verification.

[0045] 4. The motor-driven method can precisely control the formation and propagation of internal waves, thus facilitating the study and observation of internal waves.

[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An internal wave tank test system, characterized in that: It includes a water tank body, and a control unit electrically connected to the water tank body; The water tank body is provided with an internal wave generating unit, the internal wave generating unit has a stroke moving along the long side direction of the water tank body, and has a stroke moving along the vertical direction of the long side of the water tank body, and the internal wave is generated in the water tank body through the movement of the internal wave generating unit; The control unit is electrically connected to the internal wave generating unit to control the movement mode of the internal wave generating unit.

2. The internal wave tank test system according to claim 1, characterized in that: The internal wave generating unit comprises a wave generating plate and a thrust assembly; One end of the wave generating plate is fixed to the thrust assembly, and the other end is a free end; The thrust assembly is fixed on the water tank body, and the free end of the wave generating plate is driven to move in the water tank body by the thrust assembly.

3. The internal wave tank test system according to claim 2, characterized in that: The thrust assembly includes a lateral thrust assembly and a vertical thrust assembly; The lateral thrust assembly is arranged along the long side of the water tank body, the vertical thrust assembly is slidably matched with the lateral thrust assembly, and the arrangement direction is perpendicular to the lateral thrust assembly; The wave generating plate is fixed on the vertical thrust assembly.

4. The internal wave tank test system according to claim 3, characterized in that: The lateral thrust assembly includes a horizontal motor and a horizontal screw rod; There are two horizontal screw rods, which are arranged on both sides along the long side of the water tank body; There are one or two horizontal motors, which are fixed on one end of the horizontal screw rod away from the water tank body; when there is one horizontal motor, two horizontal screw rods are driven simultaneously by one horizontal motor; when there are two horizontal motors, two horizontal screw rods are driven respectively by two horizontal motors.

5. The internal wave tank test system according to claim 4, characterized in that: The vertical thrust assembly includes a vertical motor and a vertical screw rod; There are two vertical screw rods, which are arranged on the horizontal screw rod in the vertical direction along the long side of the water tank body and slide with the horizontal screw rod. The wave generating plate is fixed between the two vertical screw rods by a cross bar. There are one or two vertical motors fixed at the top of the vertical screw rod; when there is one vertical motor, two vertical screw rods are driven simultaneously by one vertical motor; when there are two vertical motors, two vertical screw rods are driven respectively by two vertical motors.

6. The internal wave tank test system according to claim 3, characterized in that: The water tank body is a long strip trough structure with an opening on the upper surface and baffles on the lower surface and four sides, and a support frame is provided around the baffle; The internal wave generating unit is located at the front end of the water tank body; the rear end of the water tank body is provided with an energy dissipation device for eliminating wave energy; A fixing block is provided at the bottom of the water tank body, and the water tank body is leveled or fixed by the fixing block.

7. The internal wave tank test system according to any one of claims 1 to 6, characterized in that: The control unit includes a power supply and a motor driver electrically connected to the power supply; The motor driver is electrically connected to the internal wave generating unit, and the internal wave generating unit is driven to move by the motor driver.

8. The internal wave tank test system according to claim 7, characterized in that: The motor driver includes a horizontal motor driver and a vertical motor driver; The horizontal motor driver is electrically connected to the lateral thrust assembly; the vertical motor driver is electrically connected to the vertical thrust assembly.

9. The internal wave water tank test system according to any one of claims 1 to 6, characterized in that: The length of the water tank body is 6-10 meters.

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