A wave absorber for an internal wave tank

Abstract

The application is a wave absorbing device for an internal wave experiment water tank, belonging to the technical field of wave absorbing; comprising a water tank, a wave absorbing module, a buffer module, a power control module and a wave absorbing measuring instrument, the power control module is connected with the wave absorbing module through the buffer module; the wave absorbing measuring instrument is used to measure the related parameters of the waves in the water tank; the power control module is used to control the movement speed and direction of the buffer module; the buffer module drives the wave absorbing module to move; the wave absorbing module consumes the energy of the waves. The power control module controls the movement mode of the buffer module, and the wave absorbing mode of the wave absorbing module is adjusted in combination with the wave height, wave speed and other related wave parameters measured by the wave absorbing measuring instrument; the application has the advantages of simple operation, easy control, effective elimination of wave reflection, and is suitable for different types of water tanks and different wave states.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wave absorbing, and particularly relates to a wave absorbing device for an internal wave experimental water tank. BACKGROUND

[0002] With the implementation and deepening of China's marine development and marine strategy, people pay more and more attention to marine development and utilization. However, the complex marine environment also increases many difficulties for developing marine resources. In order to reduce the harm of engineering structures in the marine environment, it is extremely important to carry out a series of marine working condition simulation experiments. As an important natural movement phenomenon in the ocean, internal wave makes a great contribution to energy exchange in the ocean, but at the same time, its existence also brings great influence and harm to marine engineering structures. Therefore, it is of great significance to study the safety of marine internal waves to marine structures. In the development of internal wave experiments, internal waves are generally generated by gravity collapse method, double push plate method and the like in the internal wave stratified experimental water tank with limited length, but due to the limitation of the length of the water tank, when the internal wave propagates to the end of the water tank, the wall reflection phenomenon occurs, which easily interferes with the original wave, affects the observation and measurement of the experimental phenomenon, and has an impact on the experimental results.

[0003] In order to reduce the influence of wave reflection on the experiment, a wave absorbing device is usually installed at the end of the water tank. At present, various wave absorbing forms are applied in the wave tank, and the wave absorbing performance is good or bad. Most of them are from the perspective of wave energy consumption to achieve the purpose of wave absorption. In the prior art, a circular hole wave absorbing plate is inclinedly placed, and wave absorbing components such as wave absorbing balls and filter water wave cutting nets are arranged below the circular hole wave absorbing plate to absorb waves, but the space occupied is large, and it is difficult to adjust the extension device to change the height and width under different wave conditions; an arc-shaped panel with circular holes is combined with a plurality of steel wire meshes, the water flow is guided to the lower part through the arc-shaped panel with circular holes, the wave passes through the steel wire mesh, and the wave reflection effect is weakened by the damping action of the steel wire mesh, but the open rate of the steel wire mesh is constant, if the open rate of the steel wire mesh is too large, a too long wave absorbing area is needed to achieve the same wave absorbing effect, thereby reducing the effective length of the water tank; if the open rate of the steel wire mesh is too small, the reflectivity of the wave will increase, and good wave absorbing effect cannot be achieved; there is also a wave absorbing device which is composed of a wave absorbing plate with adjustable inclination and a horizontally placed wave absorbing sheet, and the wave absorbing plate and the wave absorbing sheet cooperate with each other to absorb waves, but the inclination of the wave absorbing plate and the effective distance between the wave absorbing sheet cannot be changed in real time, and when the wave environment changes, the ideal wave absorbing effect cannot be achieved. SUMMARY

[0004] Technical problems to be solved:

[0005] In order to avoid the prior art, the application provides a wave absorbing device, which is a dynamic boundary type active wave absorbing device for an internal wave experimental water tank. The wave absorbing device has the advantages of simple operation, easy control, effective wave reflection elimination, and application to different types of water tanks and different wave conditions.

[0006] The technical scheme of the application is a wave absorbing device for an internal wave experimental water tank, which comprises a water tank, characterized in that it further comprises a wave absorbing module, a buffer module, a power control module and a wave absorbing measuring instrument.

[0007] The wave absorbing measuring instrument measures the related parameters of the waves in the water tank.

[0008] The power control module controls the movement speed and direction of the buffer module.

[0009] The buffer module drives the wave absorbing module to move.

[0010] The wave absorbing module consumes the energy of the waves.

[0011] The further technical scheme of the application is that the wave absorbing module comprises a pulley, a slide rail and a wave baffle, the slide rail is arranged on the inner wall of one end of the water tank, and the pulley is installed on the circumference of the wave baffle.

[0012] The further technical scheme of the application is that the slide rail comprises four straight guide rails, which are symmetrically arranged and horizontally fixed on the opposite wall surfaces of one end of the water tank.

[0013] The further technical scheme of the application is that the four pulleys are symmetrically installed on the two sides of the wave baffle and are cooperatively installed with the four straight guide rails in the water tank, so that the pulleys can move linearly and reciprocally in the guide rails.

[0014] The further technical scheme of the application is that the wave baffle is a rectangular glass plate, and the width is smaller than the width of the water tank.

[0015] The further technical scheme of the application is that the wave absorbing measuring instrument is installed on the inner wall of the water tank, and is located at a position 3-5 cm away from the outer end surface of the wave baffle.

[0016] The further technical scheme of the present application is that the buffer module is a hydraulic cylinder, the fixed end of which is close to the sink sidewall, and the piston rod end is fixed at the center of the inner end face of the wave baffle, and the wave baffle is driven to move along the slide rail through the axial reciprocating movement of the piston rod.

[0017] The further technical scheme of the present application is that the fixed end of the hydraulic cylinder is provided with a foam plate between the sink sidewall, for preventing disturbance caused by contact with the sink when the hydraulic cylinder works.

[0018] The further technical scheme of the present application is that the hydraulic cylinder is installed in the sink through the support frame and is located between the sidewall and the wave baffle.

[0019] The further technical scheme of the present application is that the power control module comprises a throttle valve, an electromagnetic reversing valve, a motor and a hydraulic pump, the hydraulic pump is driven by the motor, and then the movement of the hydraulic cylinder is controlled.

[0020] The two throttle valves are respectively installed at the oil inlet and outlet of the hydraulic cylinder, for controlling the movement speed of the hydraulic cylinder.

[0021] The electromagnetic reversing valve is used for controlling the movement direction of the hydraulic cylinder.

[0022] The further technical scheme of the present application is that the electromagnetic reversing valve is a three-position four-way electromagnetic reversing valve.

[0023] Advantages

[0024] The present application has the advantages that:

[0025] 1. The power control module is a hydraulic control system composed of a throttle valve, a hydraulic pump and an electromagnetic reversing valve, which can realize wave elimination in different wave states (different water depths and different amplitudes) and is simple to operate.

[0026] 2. The dynamic boundary of the sink is formed by the wave elimination module and the buffer module. The excess energy of the wave is consumed by moving the glass baffle, which can effectively avoid wave reflection and has remarkable wave elimination effect.

[0027] 3. It is convenient to disassemble, the required wave elimination distance can be arbitrarily adjusted by controlling the extension length of the piston rod, and the size of the sink can be effectively reduced. DETAILED DESCRIPTION

[0028] Figure 1 It is a schematic view of the present application, a dynamic boundary type active wave elimination device for an internal wave experimental sink;

[0029] Figure 2 It is an installation schematic view of the pulley and the glass baffle.

[0030] Explanation of reference numerals in the attached drawings: 1. Water tank; 2. Wave damping measuring instrument; 3. Pulley; 4. Slide rail; 5. Throttle valve; 6. Throttle valve; 7. Solenoid directional valve; 8. Motor; 9. Hydraulic pump; 10. Foam board; 11. Support frame; 12. Hydraulic cylinder; 13. Glass baffle. Detailed Implementation

[0031] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Reference Figure 1 As shown in this embodiment, a dynamic boundary type active wave-damping device for an internal wave experimental water tank includes a water tank, a wave-damping module, a buffer module, a power control module, and a wave-damping measuring instrument 2. The power control module is connected to the wave-damping module through the buffer module. The wave-damping measuring instrument measures wave parameters such as wave height and wave velocity within the water tank. The buffer module is a hydraulic cylinder 12. The power control module includes throttle valves 5 and 6, an electromagnetic reversing valve 7, a motor 8, and a hydraulic pump 9. The motor 8 drives the hydraulic pump 9, thereby controlling the movement of the hydraulic cylinder 12. The wave-damping module includes pulleys, slide rails, and wave baffles, and is installed at one end of the water tank to dissipate wave energy.

[0034] Reference Figure 2 As shown, four pulleys 3 are fixed by drilling holes at the four corners of the glass baffle 13. The distance from the center of the hole to the two vertical sides is 5cm, and the hole diameter is 0.8cm. The pulleys are welded to two iron plates with a length, width, and thickness of 10cm, 1.5cm, and 0.3cm, respectively. The iron plates also have through holes with a diameter of 0.8cm. During installation, the glass baffle 13 is installed between the two iron plates and then fixed with M6 bolts.

[0035] Four slide rails 4 are straight and horizontally fixed at the right end of the water tank 1 and are parallel to each other. The center line of the slide rail 4 is 8cm away from the upper and lower edges of the water tank. The slide rail is 40cm long and the right end of the slide rail is close to the right end face of the water tank.

[0036] Hydraulic cylinder 12 is fixed on the water tank 1 far from the wave source by support frame 11, and foam board 10 is placed between the end of hydraulic cylinder 12 and the end face of water tank 1 to avoid disturbance caused by the contact between hydraulic cylinder 12 and water tank 1 during work. Glass baffle 13 is limited to move left and right on slide rail 4 by pulley 3, and the piston rod of hydraulic cylinder 12 is directly in contact with glass baffle 13, so that the moving speed of glass baffle 13 is controlled by hydraulic cylinder 12 until the excess wave is consumed, thereby avoiding the occurrence of wave reflection event, and after the excess wave is consumed, hydraulic cylinder 12 is used to slowly push glass baffle 13 to the original position, so as to ensure the consistency of experimental parameters, make the wave at the entrance of the wave absorbing device propagate normally, and improve the wave mode capability in the experimental water tank.

[0037] In this embodiment, the working principle of the dynamic boundary type active wave absorbing device is as follows:

[0038] The movement of glass baffle 13 is controlled by a hydraulic system composed of hydraulic cylinder 12, throttle valves 5 and 6, electromagnetic reversing valve 7, motor 8 and hydraulic pump 9.

[0039] After receiving the wave data collected by wave absorbing measuring instrument 2, the energy of the wave at this time and the force acting on glass baffle 13 are obtained through corresponding analysis and calculation, so that the excess part is converted into pressure energy of hydraulic cylinder 12, the electromagnetic reversing valve 7 is reversed by control, and the purpose of controlling the left and right movement of glass baffle 13 is achieved. When the force acting on glass baffle 13 is greater than the set pressure of electromagnetic reversing valve 7, glass baffle 13 moves to the right to slowly retract hydraulic cylinder 12 and consume the excess energy of the wave; when the wave absorbing work is completed, the force acting on glass baffle 13 is less than the set pressure of electromagnetic reversing valve 7, electromagnetic reversing valve 7 is reversed again to control hydraulic cylinder 12 to push glass baffle 13 to move to the left to the initial position; when the force acting on glass baffle 13 is equal to the set pressure, electromagnetic reversing valve 7 is in the middle position, and hydraulic cylinder 12 remains stationary. Throttle valves 5 and 6 can control the movement speed of the piston rod by adjusting the opening degree of the valve port, thereby limiting the moving speed of glass baffle 13. In addition, the three surfaces of glass baffle 13 in contact with water tank 1 can be wrapped with high-viscosity foam to avoid overflow of the fluid in water tank 1 to the other side of glass baffle 13, causing other errors.

[0040] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments without departing from the principles and purposes of the present application within the scope of the present application.

Claims

1. A wave-damping device for an internal wave tank, comprising a tank, characterized in that: It also comprises a wave absorbing module, a buffer module, a power control module and a wave absorbing measuring instrument. The wave absorbing measuring instrument is installed on the inner wall of the water tank at a position 3-5 cm away from the outer end surface of the wave baffle, and can measure the wave height and wave speed in the water tank. The power control module controls the movement speed and direction of the buffer module, and can realize wave absorption in different water depths and different amplitude wave conditions. The power control module comprises a throttle valve, an electromagnetic reversing valve, a motor and a hydraulic pump, the motor drives the hydraulic pump to control the movement of the hydraulic cylinder, two throttle valves are installed on the inlet and outlet of the hydraulic cylinder to control the movement speed of the hydraulic cylinder, and the electromagnetic reversing valve is used to control the movement direction of the hydraulic cylinder. The buffer module drives the movement of the wave absorbing module, the buffer module is a hydraulic cylinder, the fixed end of which is close to the side wall of the water tank, the piston rod end is fixed to the center of the inner end surface of the wave baffle, and the axial reciprocating movement of the piston rod drives the wave baffle to move along the slide rail. The wave absorbing module comprises a pulley, a slide rail and a wave baffle, the slide rail is arranged on the inner wall of one end of the water tank, the pulley is installed on the circumference of the wave baffle, the outer end surface of the wave baffle faces the wave flow direction, and the wave baffle moves linearly along the guide rail through the pulley, and the movement direction is parallel to the wave advancing direction.

2. The wave absorber for an internal wave experimental flume according to claim 1, wherein: The slide rail comprises four straight guide rails, two of which are symmetrical and horizontally fixed on the opposite wall surfaces of one end of the water tank, four pulleys are symmetrically installed on the two sides of the wave baffle and are matched with the four straight guide rails in the water tank to realize linear reciprocating movement in the track, the wave baffle is a rectangular glass plate with a width smaller than the width of the water tank, and the glass baffle is moved by the wave to consume the excess energy of the wave, thereby effectively avoiding wave reflection.

3. The wave absorber for an internal wave experimental flume according to claim 1, wherein: A foam plate is arranged between the fixed end of the hydraulic cylinder and the side wall of the water tank to prevent disturbance caused by contact between the hydraulic cylinder and the water tank during operation. The electromagnetic reversing valve is a three-position four-way electromagnetic reversing valve.

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