Active wave absorbing device and method for a wave board of a large-scale test pool

Abstract

The application discloses a kind of active wave-damping device and method of large-scale test pool wave-making plate, belong to water engineering technical field.The device includes: wave-making plate (1), push plate mounting bracket (2), motion controller (5), synchronous belt drive assembly (6) and drive piece mounting bracket;Drive piece mounting bracket is horizontally arranged, and one end is fixed on the pool wall of test pool, and the other end is in free state;Synchronous belt drive assembly is arranged on drive piece mounting bracket and is connected with motion controller;Push plate mounting bracket is arranged below drive piece mounting bracket and is fixedly connected with synchronous belt drive assembly;When synchronous belt drive assembly works under the control of motion controller, it drives push plate mounting bracket to realize horizontal movement;Wave-making plate is fixed at the front end of push plate mounting bracket, and waves are realized along with push plate mounting bracket movement;Motion controller controls according to wave-making plate control equation determined in time domain and frequency domain.This application can solve the problem of wave reflection of full three-dimensional test pool, and ensure the simulation accuracy of wave.

Description

Technical Field

[0001] This invention belongs to the field of water engineering technology, specifically relating to an active wave-damping device and method for a wave-generating plate in a large experimental water tank. Background Technology

[0002] With the proposal of the maritime power strategy, research on ports, coastlines, and ship performance has become a hot topic. All of this research relies on high-precision wave physics model testing environments. In a real ocean environment, waves are reflected when they encounter structures during propagation and then propagate directly to the open ocean without causing secondary interference to the structures. However, in physical model tests, due to the limitations of the test pool's boundary, waves generated by the wave-generating equipment are reflected at the pool boundary. These reflected waves interfere with and superimpose with the original incident waves, failing to achieve the desired experimental simulation effect. Existing wave-damping technologies can be categorized into passive wave-damping technologies and quasi-three-dimensional active absorption technologies based on their principles.

[0003] Passive wave damping systems are typically installed at the ends of pools, using specific materials or structural designs. However, waves break up at the point of impact, dissipating energy and reducing reflection. While passive wave damping technology is effective, it has some drawbacks:

[0004] 1) High maintenance costs: Wave damping structures may be affected by waves, water flow and corrosion during use, requiring regular maintenance and replacement, which increases operating costs;

[0005] 2) Poor wave damping performance: Traditional passive wave damping devices usually adopt a single structural form, which has a poor wave damping effect when dealing with long-period waves and high-energy waves;

[0006] 3) Space occupation: The wave-damping structure requires a certain amount of pool space, which affects the actual usable area of ​​the pool and limits the actual efficiency of the pool.

[0007] Quasi-three-dimensional active absorption technology is based on the idea of ​​generating compensation waves. It establishes a connection between the wave signal fed back from the sensor and the motion of the wave generator, assuming that the displacement of the wave generator can be considered as the superposition of the displacement of the wave generator that produces the incident wave and the displacement of the wave generator that absorbs the secondary reflected wave. This technology assumes that the angle of the reflected wave is a known and definite angle in order to actively eliminate wave reflection. However, it has drawbacks:

[0008] 1) Application limitations: Quasi-three-dimensional active absorption technology assumes that the angle of the reflected wave is a known and fixed angle. However, in actual applications, the angle of the reflected wave is constantly changing. This assumption of a fixed angle limits its application range. It can only compensate for reflected waves with a single angle and is difficult to deal with complex multi-angle reflected wave fields.

[0009] 2) Poor real-time performance: The theoretical displacement of the wave-generating plate under different wave angles is calculated by substituting the pre-set reflected wave angle into the three-dimensional hydrodynamic transfer function. However, it is impossible to determine the wave direction in real time and correct the wave-generating plate motion. Summary of the Invention

[0010] The present invention aims to at least partially solve one of the technical problems in the aforementioned related technologies.

[0011] Therefore, the purpose of this invention is to provide an active wave-damping device and method for a wave-generating plate in a large experimental water tank, which can solve the wave reflection problem in a full three-dimensional experimental water tank and ensure the simulation accuracy of waves.

[0012] To solve the above-mentioned technical problems, the present invention is implemented as follows:

[0013] This invention provides an active wave-damping device for a wave-generating plate in a large experimental water tank. The device includes: a wave-generating plate 1, a pusher plate mounting frame 2, a motion controller 5, a synchronous belt drive assembly 6, and a drive component mounting frame.

[0014] The drive component mounting bracket is horizontally arranged, with one end fixed to the wall of the test water tank and the other end in a free state; the synchronous belt drive assembly 6 is arranged on the drive component mounting bracket and connected to the motion controller 5.

[0015] The push plate mounting frame 2 is located below the drive component mounting frame and is fixedly connected to the synchronous belt drive assembly 6. When the synchronous belt drive assembly 6 operates under the control of the motion controller 5, it drives the push plate mounting frame 2 to move horizontally. The wave-generating plate 1 is fixed to the front end of the push plate mounting frame 2 and moves with the push plate mounting frame 2 to achieve wave suppression and wave generation.

[0016] In addition, the active wave-damping device for the large-scale experimental water tank wave-generating plate according to the present invention may also have the following additional technical features:

[0017] In some embodiments, the device further includes: a plurality of laser sensors 3, a plurality of ultrasonic sensors 4, and a host computer;

[0018] The laser sensor 3 is located on the upper part of the front surface of the wave-making plate, and at least one laser sensor is provided on each wave-making plate.

[0019] The ultrasonic sensor 4 is disposed on the extended front line of the drive component mounting bracket, and the extended lengths of the multiple ultrasonic sensors 4 are different, so that the ultrasonic sensors 4 are arranged alternately.

[0020] The host computer is connected to the laser sensor 3 and the ultrasonic sensor 4, and is used to calculate the control equation for the wave-generating plate based on the information collected by the laser sensor 3 and the ultrasonic sensor 4.

[0021] In some embodiments, the synchronous belt drive assembly 6 includes a servo motor, a driving pulley, a driven pulley, and a synchronous belt with connecting teeth on its inner side;

[0022] The motor shaft of the servo motor is fixedly connected to the drive wheel. One end of the synchronous belt is engaged with the drive wheel, and the other end is engaged with the driven wheel. The rotation of the drive wheel drives the synchronous belt and the driven wheel to rotate. The synchronous belt is fixedly connected to the push plate mounting frame 2, thereby driving the push plate mounting frame 2 to achieve displacement.

[0023] In some embodiments, the top of the push plate mounting frame 2 is provided with a guide rail slider, and the lower surface of the drive component mounting frame is provided with a corresponding horizontal guide rail. The guide rail slider and the guide rail are slidably connected. When the push plate mounting frame 2 is driven to move back and forth, the wave-making plate 1 connected to the push plate mounting frame 2 also moves back and forth at the same time, generating a pushing and pulling force on the water to achieve the purpose of wave generation.

[0024] In some of these embodiments, the host computer performs calculations in both the time and frequency domains based on the information collected by the laser sensor 3 and the ultrasonic sensor 4 to determine the control equations for the wave-generating plate.

[0025] In some implementations, the host computer calculates the main direction of the reflected wave field using a direction angle algorithm based on the information collected in real time, and determines the control equation for the wave-generating plate based on the main direction.

[0026] In some implementations, the acquired information includes amplitude, frequency, and direction of arrival.

[0027] In some embodiments, the push plate mounting bracket 2 is a triangular stainless steel truss.

[0028] In some embodiments, each of the push plate mounting brackets 2 has two guide rail sliders on its top, which are matched with two guide rails.

[0029] This invention also provides an active wave-damping method for a wave-generating plate in a large test pool, characterized in that it is implemented using an active wave-damping device for a wave-generating plate in a large test pool as described in any of the preceding claims;

[0030] The method calculates the control equation for the wave-generating plate based on the information collected by the sensor in real time from both the time and frequency domains. Then, it sends a real-time control signal to the motion controller 5 according to the control method. The motion controller 5 controls the synchronous belt drive component 6 to move, thereby driving the corresponding wave-generating plate 1 to generate waves.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] In this embodiment of the invention, the active wave-damping device for the large experimental water tank wave-generating plate ensures that the wave-generating plate can move flexibly and generate waves through the square structure of the wave-generating plate and its connection with the push plate mounting frame; the arrangement and number of laser sensors and ultrasonic sensors ensure that wave signals can be collected accurately in real time; the coordinated work of the motion controller and the synchronous belt drive assembly realizes precise control of the wave-generating plate movement.

[0033] In this embodiment of the invention, the active wave-damping device for the wave-generating plate of the large experimental water tank determines the control mode of the wave-generating plate by combining the time domain and frequency domain perspectives, which can ensure effective wave absorption under different conditions; the introduction of the direction angle algorithm realizes compensation for multi-angle reflected waves by calculating the direction of reflected waves in real time.

[0034] In this embodiment of the invention, the active wave-damping device for the large experimental water tank wave-generating plate uses laser and ultrasonic sensors to collect data in real time, ensuring the accuracy and real-time performance of the wave signal. The motion controller adjusts the displacement increment of the wave-generating plate in real time based on the wave signal fed back by the sensors, combined with the active absorption algorithm, to achieve dynamic compensation. By using the phase difference of the motion of multiple wave-generating plates, oblique wave generation is achieved, compensating waves are generated, and finally, full three-dimensional active absorption wave generation is realized.

[0035] The active wave-damping method for the large-scale experimental water tank wave-generating plate of the present invention is implemented using the active wave-damping device of the large-scale experimental water tank wave-generating plate described above. Therefore, it possesses at least all the features and advantages of the active wave-damping device of the large-scale experimental water tank wave-generating plate described above, which will not be repeated here. Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the active wave-damping device for a large experimental water tank wave-generating plate disclosed in one embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram of a single-source linear array signal reception using an orientation angle algorithm disclosed in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of a multi-plate oblique wave generator disclosed in an embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1-Wave-generating plate; 2-Push plate mounting bracket; 3-Laser sensor; 4-Ultrasonic sensor; 5-Motion controller; 6-Synchronous belt drive assembly. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and specific examples and application scenarios.

[0043] Existing wave-damping technologies often suffer from limitations. Passive wave-damping devices require significant space, necessitate regular maintenance based on usage, leading to increased costs. Furthermore, due to the wide energy distribution of long waves, single-structure wave-damping devices struggle to effectively attenuate energy, exhibiting poor absorption of long-period waves. Quasi-three-dimensional active absorption technologies, assuming a known and definite angle for reflected waves, primarily compensate for single-angle reflected waves, failing to address complex multi-angle reflected wave fields, exhibiting low real-time performance, and hindering accurate experimental simulation. This invention proposes an active wave-damping device for a large-scale experimental water tank wave-generating plate. This device assumes the direction of reflected waves is unknown and unpredictable, containing multiple angular components. By placing a laser wave height meter on the plate and alternating ultrasonic height meters in front of and behind it, the direction of reflected waves is detected in real-time. The wave-generating plate displacement is then corrected in real-time to generate a compensation wave, enabling the device to handle complex multi-angle reflected wave fields and achieve fully three-dimensional active wave-damping while ensuring the stability and real-time performance of the wave-damping process.

[0044] Please see Figure 1 As shown, in some embodiments of the present invention, the active wave-damping device of the wave-generating plate of the large experimental water tank includes: a wave-generating plate 1, a push plate mounting bracket 2, a laser sensor 3, an ultrasonic sensor 4, a motion controller 5, a synchronous belt drive assembly 6, and a drive component mounting bracket.

[0045] In the above embodiment, the drive component mounting frame is horizontally arranged, with one end fixed to the wall of the test water tank and the other end in a free state. The synchronous belt drive assembly 6 is mounted on the drive component mounting frame and connected to the motion controller 5; the push plate mounting frame 2 is located below the drive component mounting frame and is fixedly connected to the synchronous belt drive assembly 6; when the synchronous belt drive assembly 6 operates under the control of the motion controller 5, it drives the push plate mounting frame 2 to move horizontally; the wave-making plate 1 is fixed to the front end of the push plate mounting frame 2 and moves along with the push plate mounting frame 2. The movement of the wave-making plate 1 pushes the water to move, thereby creating waves.

[0046] In some embodiments of the present invention, the active wave-damping device of the large experimental water tank wave-generating plate further includes a host computer, which is connected to the motion controller 5. When the active wave-damping device is working, the wave parameters are first set through the host computer. After calculating and processing each parameter, an excitation signal is generated based on this and transmitted to the motion controller 5. The motion controller 5 controls the synchronous belt drive assembly 6 to perform corresponding actions according to the excitation signal. The servo motor in the synchronous belt drive assembly 6 receives motion commands from the PLC control program running in the corresponding motion controller and returns the motion status signal of the servo motor.

[0047] In some embodiments of the present invention, the synchronous belt drive assembly 6 includes a servo motor, a driving pulley, a driven pulley, and a synchronous belt with connecting teeth on its inner side. The servo motor is fixedly connected to the driving pulley, and the motor shaft drives the driving pulley to rotate. One end of the synchronous belt is engaged with the driving pulley, and the other end is engaged with the driven pulley. The rotation of the driving pulley drives the synchronous belt and the driven pulley to rotate. The rotation of the synchronous belt causes displacement at various positions on the synchronous belt. Since the push plate mounting bracket 2 is fixedly connected to the synchronous belt, it drives the push plate mounting bracket 2 to achieve displacement, that is, the rotation of the servo motor is converted into the back-and-forth movement of the push plate mounting bracket. There can be multiple sets of synchronous belt drive assemblies 6, and each set of synchronous belt drive assemblies corresponds to one wave-making plate.

[0048] In the above embodiment, the push plate mounting frame 2 can be a triangular stainless steel truss. The top of the triangular stainless steel truss is provided with a guide rail slider, and the lower surface of the drive component mounting frame is provided with a corresponding horizontal guide rail. The guide rail slider and the guide rail are slidably connected to support the weight of the plate surface and the mounting frame, and to allow it to slide freely back and forth. When the push plate mounting frame 2 is driven to move back and forth, the wave-making plate 1 connected to the push plate mounting frame 2 will also move back and forth with the mounting frame, generating a pushing and pulling force on the water to achieve the purpose of wave generation.

[0049] There are two or more wave-generating plates 1. Each wave-generating plate simultaneously generates a traveling wave (a wave with a period higher than the target wave) and a compensating wave (a wave that cancels out secondary reflections). Therefore, the motion of the wave-generating plates is a superposition of wave-generating motion and active absorption motion. Two or more wave-generating plates can utilize the phase difference between the plates to achieve oblique wave generation, thus achieving a three-dimensional effect.

[0050] Three-dimensional wave generation is a multi-plate collaborative process. In, for example... Figure 3 In the schematic diagram of the multi-plate oblique wave generator shown, when the phase difference between the motion of the plates is... When the direction angle θ satisfies formula (1), oblique wave generation with a direction angle of θ can be performed. Wherein, the wave period is T, the wavelength is L, the wave generating plates are arranged along the y direction, the normal of the wave generating boundary is the x direction, the width of a single plate is b, the total number of plates is m, and k0 is the wave number of the traveling wave.

[0051]

[0052] In some embodiments of the present invention, the laser sensor 3 is disposed at the upper part of the front surface of the wave-making plate, and at least one laser sensor 3 is disposed on each wave-making plate. The ultrasonic sensor 4 is fixedly disposed above the front of the wave-making plate in a forward-extending manner. The forward extension direction can be along the drive component mounting bracket. The forward extension lengths of the multiple ultrasonic sensors 4 are different, so that the ultrasonic sensors 4 are arranged in an alternating manner.

[0053] In the theoretical derivation of the active absorption method, algorithms are divided into time-domain algorithms and frequency-domain algorithms based on the solution domain. The algorithms in both domains are combined to determine the control mode of the wave generator.

[0054] Time-domain algorithm:

[0055] The displacement of the wavemaker plate is determined by the displacement value x of the wavemaker plate that generates the traveling wave. gen (t) and the displacement value x of the wave-generating plate that generates the compensation wave. abs (t) Composition:

[0056] x a (t)=x gen (t)+x abs (t)=X mg sin(ωt-kysinθ)+X ma sin(ωt-kysinθ+φ) (2)

[0057] In the formula, X mg X ma The midpoints of the wave generator plates for pure wave generation and compensated wave generation are respectively, ω is the angular frequency, k is the wave number at that water depth with wave period T, y is the coordinate of the center position of the wave generator plate, and θ is the wave direction angle.

[0058] Let the wave elevation on the wave generator plate in the quasi-three-dimensional active wave-generating pool be η0(t), which can be expressed as:

[0059]

[0060] In the formula, η p (t) represents the target traveling wave height. For the corresponding non-propagating mode wave height, η r (t) represents the height of the first reflected wave, η rr (t) represents the height of the secondary reflected wave. For the motion of the wave-generating plate used for active absorption x abs The height of the compensation wave generated by (t) has an absolute value that is related to η. rr (t) are consistent, but the phase difference is 180°. This represents the height of the non-modal wave generated by this process. When the secondary reflection coefficient is 100%, η r (t)=η rr (t). And according to linear wave generation theory:

[0061]

[0062] e0 and en represent the three-dimensional hydrodynamic transfer functions of the traveling wave and the non-propagating mode term, respectively, denoted as:

[0063]

[0064] Transforming the above equation using the linear wave-generating theory yields the governing equations for active absorption in the time domain, where m represents time m and x represents the real-time displacement of the wave-generating plate:

[0065]

[0066] Frequency domain algorithm:

[0067] When the wave generator is in active absorption mode, its motion can be considered as a superposition of pure wave generation motion and compensating wave generation motion. That is, the frequency domain complex amplitude X of the wave generator motion can be expressed as:

[0068]

[0069] In the above formula, X a abs and X a gen These are the frequency domain complex amplitude values ​​of the wave generator displacement under pure wave generation and the wave generator displacement corresponding to the generated compensation wave, respectively. p，0 Let F be the theoretical frequency domain complex amplitude value of the target wave height in front of the plate calculated by linear wave generation theory, and let F be the frequency domain transfer function of active absorption wave generation, which is related to the three-dimensional hydrodynamic transfer functions e0 and e n related.

[0070]

[0071]

[0072]

[0073] Then, by performing an inverse Fourier transform, we can obtain:

[0074] x a =(2η p -η0)F (11)

[0075] In digital signal processing, equation (11) can be regarded as a discrete linear time-invariant system (LTI system) with a single input and a single output, where the input is a wave height signal and the output is a wave plate displacement signal. By constructing the linear constant coefficient difference equation corresponding to the active absorption frequency transfer function F, equation (12) is a typical difference equation.

[0076]

[0077] In the formula, y and x are the output signal and input signal, respectively, and the filter coefficients a n b m It determines the relationship between the input and output signals, and is also the design parameter of the frequency domain filter corresponding to the difference equation. It is obtained by fitting the frequency domain transfer function F to the filter.

[0078] As can be seen from the above active absorption theory, in order to realize the active absorption function in the wave-generating system, wave parameter information needs to be obtained as a control signal to participate in the calculation of the active absorption algorithm. Therefore, wave height sensors need to be deployed for real-time data acquisition. To avoid interference from the strong electric environment and to control the experimental cost, a method is adopted in which laser sensors 3 are placed on the wave-generating plate and ultrasonic sensors 4 are alternately placed in front of the wave-generating plate. This makes the wave surface acquisition more accurate and ensures the real-time performance of the wave surface signal acquisition. The main data acquisition is the wave height on the wave-generating plate, i.e., η0(t). The displacement increment of the wave-generating plate is obtained according to the above derivation process.

[0079] Direction angle algorithm:

[0080] Assume the signal acquisition array (ultrasonic sensor 4) is a linear array with M elements, and the distance between the elements is d, as follows: Figure 2 As shown. In this case, a signal source transmitting a single-frequency signal is located at a distant location. Based on geometric relationships, the signals measured by each array element can be obtained as follows:

[0081]

[0082] Where S0 is the signal amplitude, ω is the signal frequency, φ is the initial phase of the signal (theoretically a complex signal), t refers to the current time, and j refers to the imaginary part. In the algorithm derivation, it is assumed that the angle between the signal direction and the normal to the sensor linear array is θ, and the signal propagation speed is c. Let the vector a(θ) based on the incoming wave direction θ be:

[0083]

[0084] The signal X(t) measured by each array element can be expressed as the product of the source signal S(t) and the direction vector a(θ). However, in practice, the source signal may be composed of multiple superimposed signals, and each signal component may have a different incoming wave direction angle. Furthermore, in practical applications, the influence of noise needs to be considered.

[0085] In this case, the data acquired by the array is represented in complex form, containing information such as the amplitude, frequency, and direction of arrival of each source signal component. It can be considered as a superposition of multiple spatial harmonic signals. Therefore, spatial spectrum analysis can be introduced, defining the spatial spectrum function P(θ):

[0086]

[0087] In the formula, α(θ) is a vector based on the direction of the incoming wave θ. H (θ) and ENH are α(θ) and ENH, respectively. N The conjugate transpose of E N To construct a pseudo-noise matrix, the values ​​of the spectral function are calculated by substituting various angles. After scanning, the peak of the spectral function is the direction angle of the incoming wave.

[0088] During active absorption, the aforementioned real-time direction angle detection algorithm is introduced to process the data collected by the ultrasonic sensor 4 in front of the wave generator, calculates the principal direction of the reflected wave field in real time, and collects the wave height signal in real time through the laser sensor 3 on the plate. The calculated wave height, angle, and other information are fed back to the motion controller 5 in real time. Based on the wave signal fed back by the sensor and the current position of the wave generator, combined with the active absorption algorithm, the displacement increment of the wave generator is output. By adjusting the motion mode of the wave generator 1, oblique wave generation can be achieved by utilizing the phase difference of the motion of multiple wave generators, generating compensation waves in real time, and ultimately realizing full three-dimensional active absorption wave generation.

[0089] The main advantages of this invention over existing technologies include:

[0090] 1. Existing passive wave-damping facilities require a certain amount of water tank space, affecting the actual usable area of ​​the water tank and limiting the actual utilization efficiency of the water tank; the present invention, through an active wave-damping device, does not require a large amount of additional water tank space, and the arrangement of wave-generating plates and sensors is compact, thereby improving the actual utilization efficiency of the water tank.

[0091] 2. Existing wave-damping structures may be affected by waves, water flow, and corrosion during use, requiring regular maintenance and replacement, which increases operating costs. This invention uses laser sensors and ultrasonic sensors for real-time data acquisition, reducing the risk of wear and corrosion of mechanical structures and lowering maintenance costs.

[0092] 3. Existing wave-damping devices typically employ a single structural form, resulting in poor wave-damping performance when dealing with long-period and high-energy waves. This invention, through the combination of time-domain and frequency-domain algorithms and the introduction of a direction angle algorithm, can effectively cope with waves of different frequencies and energies, thereby improving wave-damping performance.

[0093] 4. Existing quasi-three-dimensional active absorption technology assumes that the angle of the reflected wave is a known and fixed angle, which makes it difficult to cope with complex multi-angle reflected wave fields and has low real-time performance. This invention calculates the direction of the reflected wave in real time and combines it with real-time data acquisition from laser and ultrasonic sensors to dynamically adjust the displacement increment of the wave-generating plate, thereby enhancing the real-time performance and adaptability of the system.

[0094] 5. Existing quasi-three-dimensional active absorption technology can only compensate for reflected waves at a single angle, making it difficult to cope with complex multi-angle reflected wave fields. This invention achieves oblique wave generation by using the phase difference of the motion of multiple wave-generating plates, generating compensation waves, and ultimately realizing full three-dimensional active absorption wave generation, which can cope with complex multi-angle reflected wave fields.

[0095] For any part of this invention that is not described in detail, please refer to the prior art or the art known to those skilled in the art. It will not be elaborated on here.

[0096] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. An active wave-damping device for a wave-generating plate in a large experimental water tank, characterized in that, The device includes: a wave-generating plate (1), a push plate mounting bracket (2), a motion controller (5), a synchronous belt drive assembly (6), and a drive component mounting bracket; The drive component mounting bracket is horizontally set, with one end fixed to the wall of the test water tank and the other end in a free state; the synchronous belt drive assembly (6) is set on the drive component mounting bracket and connected to the motion controller (5); The push plate mounting bracket (2) is located below the drive component mounting bracket and is fixedly connected to the synchronous belt drive assembly (6); when the synchronous belt drive assembly (6) works under the control of the motion controller (5), it drives the push plate mounting bracket (2) to move horizontally; the wave-making plate (1) is fixed at the front end of the push plate mounting bracket (2), and as the push plate mounting bracket (2) moves, it realizes wave suppression and wave generation; The device also includes: multiple laser sensors (3), multiple ultrasonic sensors (4), and a host computer; The laser sensor (3) is located on the upper part of the front surface of the wave-making plate, and at least one laser sensor is provided on each wave-making plate; The ultrasonic sensor (4) is arranged on the extended line of the drive component mounting bracket. The extended lengths of the multiple ultrasonic sensors (4) are different, so that the ultrasonic sensors (4) are arranged alternately. The host computer is connected to the laser sensor (3) and the ultrasonic sensor (4) and is used to calculate the control equation for the wave-generating plate based on the information collected by the laser sensor (3) and the ultrasonic sensor (4); The host computer calculates the control equations for the wave-generating plate based on the information collected by the laser sensor (3) and the ultrasonic sensor (4) in both the time and frequency domains. The host computer calculates the main direction of the reflected wave field using the direction angle algorithm based on the real-time collected information, and determines the control equations for the wave-generating plate based on the main direction. The formula for the displacement of the wave-generating plate in the time domain is: ; In the formula, x gen ( t ( ) represents the displacement value of the wavemaker plate that generates the traveling wave. x abs ( t () represents the displacement value of the wave-generating plate used to generate the compensation wave; , The strokes of the wave-generating plates are respectively for pure wave generation and compensated wave generation. ω Angular frequency, k Wave cycle T The wave number at that water depth y The coordinates of the center position of the wave-generating plate are: The wave direction angle, The phase difference between wave generation and absorption motion; The governing equations for active absorption in the time domain are: ; In the formula, m represent m time, x This represents the real-time displacement value of the wave-generating plate; e 0 and e n Let represent the three-dimensional hydrodynamic transfer functions for the traveling wave and the non-propagating mode terms, respectively; To determine the wave elevation on the wave plate, For target wave height; ; The expression for the frequency domain complex amplitude X of the wave generator motion is: , In the formula, X a abs and X a gen These represent the frequency domain complex amplitude values ​​of the wave generator displacement under pure wave generation and the wave generator displacement corresponding to the generated compensation wave, respectively. This represents the theoretical frequency domain complex amplitude value of the target wave height in front of the plate, calculated using linear wave generation theory. A 0 represents the measured high-frequency complex amplitude value of the wave. A p The frequency domain complex amplitude value of the target wave height. F The frequency domain transfer function for active absorption wave generation; right X The time-domain shift correction result is obtained by performing an inverse Fourier transform; The synchronous belt drive assembly (6) includes a servo motor, a driving pulley, a driven pulley, and a synchronous belt with connecting teeth on its inner side; The motor shaft of the servo motor is fixedly connected to the drive wheel, one end of the synchronous belt is engaged with the drive wheel, and the other end is engaged with the driven wheel; the rotation of the drive wheel drives the synchronous belt and the driven wheel to rotate; the synchronous belt is fixedly connected to the push plate mounting frame (2), thereby driving the push plate mounting frame (2) to achieve displacement; The top of the push plate mounting frame (2) is provided with a guide rail slider, and the lower surface of the drive component mounting frame is provided with a corresponding horizontal guide rail. The guide rail slider and the guide rail are slidably connected. When the push plate mounting frame (2) is driven to move back and forth, the wave-making plate (1) connected to the push plate mounting frame (2) also moves back and forth at the same time, generating a pushing and pulling force on the water to achieve the purpose of wave making. Each of the push plate mounting brackets (2) has two guide rail sliders on its top, which are matched with two guide rails; The push plate mounting frame (2) is a triangular stainless steel truss.

2. The active wave-damping device for the wave-generating plate of a large experimental water tank according to claim 1, characterized in that, The collected information includes amplitude, frequency, and direction of arrival.

3. An active wave-damping method for a wave-generating plate in a large experimental water tank, characterized in that, The active wave-damping device of the large test pool wave-generating plate as described in any one of claims 1 to 2 is used to achieve this. The method calculates the control equation for the wave-generating plate based on the information collected by the sensor in real time from both the time and frequency domains. Then, it sends a real-time control signal to the motion controller (5) according to the control method. The motion controller (5) controls the synchronous belt drive component (6) to move, thereby driving the corresponding wave-generating plate (1) to move and generate waves.

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