Intelligent variable frequency tuning floating breakwater and control method thereof

Abstract

The present invention provides an intelligent variable frequency tuned floating breakwater and a control method thereof, the structure of which includes an installation foundation, an active tuned mass damper, a main floating body and a tuning control system. The active tuned mass damper is provided with an orthogonal stiffness transmission mechanism and a sliding variable damping elastic actuation system. The tuning control system is connected to the power unit of the sliding variable damping elastic actuation system for adjusting the damping. The present invention achieves motion reduction and suppression of the floating breakwater by introducing a tuned mass damper at the lower end of the main floating body, and realizes intelligent motion response under complex sea conditions through active design combined with corresponding control schemes, thereby realizing the integration of active and passive vibration reduction measures, realizing adaptive dynamic adjustment of system parameters, improving the overall system robustness, and having a simple and reliable structure and a wide range of applications. Furthermore, based on the above-mentioned mechanism design, a rigid connection is adopted to solve the anchoring problem to a certain extent, thereby enhancing the overall stability underwater.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic structures, and in particular relates to an intelligent variable frequency tuning floating breakwater and a control method thereof. Background Art

[0002] As an important hydraulic structure for resisting wave attacks and protecting coasts and ports, the technological development of breakwaters has always focused on improving energy dissipation efficiency, environmental adaptability, and functional integration. Although traditional rigid breakwaters are structurally stable, they cut off the natural water exchange mechanism and severely damage the nearshore ecosystem. This structural defect has limited their application in the current era where the need for ecological protection is becoming increasingly prominent. The emergence of floating breakwaters has made up for the ecological shortcomings of traditional structures. They are composed of upper floating components and an anchoring system, allowing for free exchange of water. They also have the advantages of light weight, low cost, and easy installation, showing good prospects in scenarios such as port protection and coastal protection. However, existing floating breakwaters face multiple technical bottlenecks in complex sea conditions: their hydrodynamic performance is significantly reduced under the action of offshore waves. In particular, when the wave frequency approaches the natural frequency of the system, a violent resonance response will occur, which not only endangers the safety of the structure but also significantly reduces the wave absorption performance. This resonance problem has become a key factor limiting the application of floating breakwaters in open waters. At the same time, in the existing technology, the reliability of the anchoring system of the floating breakwater and the control of the anchoring tension are another prominent problem.

[0003] Therefore, as Chinese patent application CN118911068A provides an air chamber floating breakwater with low anchor tension, its structure includes: a breakwater body, a connecting end, a shock absorber, a steel anchor chain, and a sinking block; after further improvement of the shock absorber, the cooperation between the fixed body and the anti-rust plate can avoid rust caused by continuous contact with seawater, and at the same time, the solar panels of the power generation structure can receive and convert the light energy in nature so that it can trigger the pneumatic body to operate. For this reason, the pneumatic body can spray gas outward to resist the impact force brought by the waves, thereby reducing the impact effect of the waves on the breakwater, and then the four cavities opened up by the corners of the fixed body can accommodate four straight pipes, so that when some waves come into contact with the anti-rust plate, seawater will directly enter the cavity and the straight pipe, and then be discharged from the other end, so that it can further improve the breakwater body's resistance to wave impact. The above technical solution aims to address the problem of traditional anchor systems being susceptible to dragging anchors under cyclic wave loads, and the problem of anchor tension peaks reaching their limits, leading to anchor failure. For example, Chinese patent application CN120099893A provides a floating breakwater for dispersing wave energy. The breakwater comprises a floating plate with a counterweight connected to its bottom via fixed cables. The counterweight prevents the anchor system from dragging anchors. An underwater energy dissipation assembly is located at the bottom of the plate to dissipate and attenuate subsurface energy. A surface wave-breaking assembly is located at the top of the plate. The above technical solution is used to gradually dissipate wave energy, dispersing the waves to reduce overall wave energy. While the counterweight design of the floating breakwater attempts to improve anchor stability, the anchor strength of the fixed anchor rods in the seabed remains insufficient, resulting in a high risk of displacement and damage to the anchor system and insufficient safe operating capacity.

[0004] Furthermore, existing floating breakwaters have significant energy dissipation flaws: most structures only dissipate surface wave energy, lacking effective treatment for underwater energy. For example, while the aforementioned underwater energy dissipation components attempt to attenuate underwater energy through the design of wave-absorbing chambers and energy-absorbing plates, the staggered arrangement of wave-absorbing holes and water-permeable holes still needs to be optimized, and the overall energy dissipation efficiency struggles to meet the demands of complex offshore operating conditions. Accordingly, Chinese patent CN116873140B provides a floating platform that integrates wave protection and ocean energy generation, and its operating method. While its tuned vibration-damping wave energy generator achieves partial energy dissipation through the complementary motion of a hydraulic damping system and a floating wind turbine, its structure is complex and lacks effective anti-resonance structures and methods for complex scenarios.

[0005] In summary, the existing floating breakwater technology has obvious deficiencies in terms of adaptability to complex sea conditions, anchor stability, energy dissipation mechanism integrity and functional synergy. It is urgent to develop a new floating breakwater technology that combines efficient energy dissipation, intelligent tuning, reliable anchoring and eco-friendliness to solve core problems such as resonance response in offshore environments, excessive anchor tension, insufficient underwater energy dissipation and low multi-functional integration efficiency. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention provides an intelligent variable frequency tuning floating breakwater and a control method thereof to solve the above problems.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] In one aspect, the present application provides an intelligent variable frequency tuning floating breakwater, which includes an installation foundation, an active tuned mass damper, a main floating body, and a tuning control system; the installation foundation is connected to the main floating body through the active tuned mass damper;

[0009] The active tuned mass damper is provided with an orthogonal stiffness transmission mechanism and a sliding variable damping elastic actuation system; the fixed end of the orthogonal stiffness transmission mechanism is connected to the mounting base, and the movable end is movably connected to the main floating body through the sliding variable damping elastic actuation system;

[0010] The tuning control system is connected to the power unit of the sliding variable damping elastic actuation system for adjusting the damping.

[0011] Furthermore, the sliding variable damping elastic actuation system is installed at the lower part of the main floating body and includes a linear motion mechanism, a tuning spring and a slider resonance mechanism;

[0012] The movable end of the linear motion mechanism is connected to the slider of the slider resonance mechanism through the tuning spring.

[0013] Furthermore, a plurality of the slider resonance mechanisms are symmetrically installed at the lower portion of the main float, and the sliders of some of the slider resonance mechanisms are connected to the tuning spring.

[0014] Furthermore, there are a plurality of slider resonant mechanisms, which are distributed in a circular shape at the lower part of the main floating body; the sliding variable damping elastic actuation system is correspondingly provided with a plurality of sets of the linear motion mechanisms;

[0015] The linear motion mechanism is installed in the longitudinal direction, and the movable end is connected to the slider resonance mechanism arranged on the lateral side through the tuning spring.

[0016] Furthermore, the orthogonal stiffness transmission mechanism is a V-shaped two-link structure, the intersection of which is hinged to the mounting base, and the two free ends are respectively connected to the adjacent sliders of the slider resonance mechanism.

[0017] Furthermore, the slider resonance mechanism includes a slide groove, a slider and an elastic member;

[0018] The slider is slidably matched with the slide groove, and the elastic member is installed between the slider and the slide groove.

[0019] Furthermore, the installation base is a turbulence dissipation perforated plate.

[0020] On the other hand, the present application also provides an intelligent variable frequency tuning floating breakwater control method, which is used for variable frequency tuning of the aforementioned intelligent variable frequency tuning floating breakwater;

[0021] The steps include:

[0022] Collect initial wave data;

[0023] Performing data modeling based on a modal decomposition method and the initial wave data to obtain a wave prediction model;

[0024] Collecting real-time wave data through the sensor;

[0025] Inputting the real-time wave data into the wave prediction model to obtain wave prediction information;

[0026] A mapping relationship between wave information and an active tuned mass damper state is established, and the active tuned mass damper is adjusted based on the wave prediction information.

[0027] Furthermore, the construction of the wave prediction model includes the following steps:

[0028] Collect the initial wave data independently or in combination through numerical simulation, physical model test, and offshore measurement;

[0029] Constructing a wave surface time series based on the initial wave data;

[0030] Extracting dynamic modes and characteristic information of the wavefront time series through high-order dynamic mode decomposition in the modal decomposition method;

[0031] A wave reconstruction model is constructed based on the dynamic mode and characteristic information, and a reconstructed signal and a predicted signal output by the wave reconstruction model are respectively subtracted from the corresponding original signals in the initial wave data to obtain a residual signal;

[0032] Training a long short-term memory network based on the residual signal to obtain a residual prediction model;

[0033] The wave reconstruction model and the residual prediction model are combined to obtain the wave prediction model.

[0034] Furthermore, data preprocessing is performed on the initial wave data;

[0035] In the data preprocessing, the initial wave data is screened and eliminated for abnormal data, and the null values ​​are filled by interpolation;

[0036] Extracting the dynamic mode and characteristic information of the wavefront time series also includes:

[0037] The wavefront time series is divided into a plurality of windows, and independent high-order dynamic mode decomposition is performed on the data in each window.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention achieves motion reduction and suppression of the floating breakwater by introducing a tuned mass damper at the lower end of the main floating body, and realizes intelligent motion response under complex sea conditions through active design combined with corresponding control schemes, thereby realizing the integration of active and passive vibration reduction measures, realizing adaptive dynamic adjustment of system parameters, and improving the robustness of the overall system. The structure is simple and reliable and has a wide range of applications. Furthermore, based on the above-mentioned mechanism design, the use of rigid connection solves the anchoring problem to a certain extent, thereby enhancing the overall stability underwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A three-dimensional diagram of a breakwater in a specific embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the interior of the main floating body in a specific embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the structure of an active tuned mass damper in a specific embodiment of the present invention;

[0044] Figure 4 A perspective view of a slider resonant mechanism in a specific embodiment of the present invention;

[0045] Figure 5 Schematic diagram of the internal structure of a sliding variable damping elastic actuation system in a specific embodiment of the present invention;

[0046] Figure 6 It is a three-dimensional diagram of the connection between the linear motion mechanism and the slider resonance mechanism in a specific embodiment of the present invention;

[0047] Figure 7 A top view of the connection between the linear motion mechanism and the slider resonance mechanism in a specific embodiment of the present invention;

[0048] Figure 8 The figure is a flow chart of wave prediction model generation in a specific embodiment of the present invention.

[0049] In the figure: 1. Turbulence dissipation perforated plate; 2. V-shaped two-link; 3. Main float; 4. Sliding variable damping elastic actuation system; 301. Box; 401. Mounting beam; 402. Active slider resonant mechanism; 403. Passive slider resonant mechanism; 404. Linear motion mechanism; 405. Tuning spring; 3011. Float slot; 3012. Armored structure; 4021. First slider; 4022. First elastic member; 4023. First slide; 4031. Second slider; 4032. Second elastic member; 4041. Servo motor; 4042. Screw; 4043. U-shaped connector; 4044. Screw nut; 4045. Support block. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0052] In the description of the present invention, it should be understood that the relative relationships indicated by terms such as "upper," "lower," and "front" are based on the order of contact with materials in the direction of rotation in actual applications. They are intended to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific position, and therefore should not be construed as limitations on the present invention. It should be noted that "transverse" and "longitudinal" refer to the short and long sides of a device or mechanism, respectively.

[0053] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted" and "connected" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] It should also be noted that the methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products unless otherwise specified.

[0055] On the one hand, the present application provides an intelligent variable frequency tuning floating breakwater, such as Figure 1 As shown, it mainly includes a mounting base, an active tuned mass damper, a main floating body and a tuning control system.

[0056] Among them, the installation base of a specific embodiment of the present application is a turbulence dissipation perforated plate 1, which serves as the mass block of the entire breakwater and is connected to the main floating body through an active tuned mass damper.

[0057] Further, combined Figure 2 As shown, the main buoy 3 of a specific embodiment of the present application utilizes a box-type structure for wave reflection and wave energy dissipation. The interior of the main buoy 3 is left hollow for installing electrical components and is structurally sealed by an upper end cap. An armored structure 3012 is laid on the box 301 of the main buoy 3 to increase overall energy dissipation, enhance overall structural strength, and cushion the impact of hard objects carried by waves. Multiple vertically extending buoy slots 3011 are machined into the bottom surface of the box 301 for mounting an active tuned mass damper.

[0058] Combine Figure 3-Figure 7 As shown, the active tuned mass damper is provided with an orthogonal stiffness transmission mechanism and a sliding variable damping elastic actuation system.

[0059] Among them, the orthogonal stiffness transmission mechanism of a specific embodiment of the present application is a plurality of groups of V-shaped two-link rods 2, the intersection of each group of two-link rods is hinged to the installation base, and the two free ends are respectively connected to the sliding variable damping elastic actuation system. Specifically, in order to achieve convenient installation and reduce the difficulty of processing other accessories, the V-shaped two-link rod 2 adopts a counter-position design, that is, the sunken edge is processed at the intersection of the two links, so that the installation side surfaces of the two free ends are located in the same plane and perpendicular to the rotation axis at the intersection. As a result, the V-shaped two-link rod 2 is shaped like a half-width scissors-type mechanism, the lower part is hinged to the installation base plane through the adapter block, and the upper two ends are used for sliding support of the sliding variable damping elastic actuation system and the main float 3.

[0060] Furthermore, a sliding variable damping elastic actuation system 4 of a specific embodiment of the present application is installed at the lower part of the main floating body 3, and includes a linear motion mechanism 404, a tuning spring 405 and a slider resonance mechanism.

[0061] The linear motion mechanism 404 includes a servo motor 4041, a lead screw 4042, a lead screw nut, and a support block 4045. In a specific embodiment of the present application, to protect electrical components, the main body of the linear motion mechanism 404 is designed to be installed in the main float 3. The output end of the servo motor 4041 is coaxially connected to the lead screw 4042. The end of the lead screw 4042 is rotatably connected to the support block 4045. The lead screw nut is connected to the slider of the linear motion mechanism, thereby accurately driving the slider in axial motion. A slide rail is also installed longitudinally in the main float 3, which is slidably connected to the slider of the linear motion mechanism 404. An inverted U-shaped connector 4043 is installed on the lead screw nut 4044. The two flanges of the U-shaped connector 4043 are inserted through the corresponding float slots 3011, thereby being exposed on the main float 3 and used to connect the tuning spring 405. A mounting crossbeam 401 is also fixed to the underside of the main buoy 3 to stabilize the sliding variable damping elastic actuation system 4. A corresponding notch is machined on its upper end surface for insertion of the flange of the U-shaped connector, and a notch is machined laterally to allow the tuning spring 405 to connect to the flange of the U-shaped connector 4043. Specifically, in one embodiment of the present application, two sets of linear motion mechanisms 404 are mounted back-to-back in the main buoy 3 along the longitudinal direction. Furthermore, a tuning spring 405 is connected to the flange of each U-shaped connector 4043, resulting in a total of four tuning springs 405 participating in the tuning actuation.

[0062] One end of the tuning spring 405 is connected to the flange of the U-shaped connector, and the other end is connected to the slider of the slider resonant mechanism. The slider resonant mechanism of a specific embodiment of the present application includes two types, namely, an active slider resonant mechanism 402 and a passive slider resonant mechanism 403. The structures of the two types of slider resonant mechanisms are basically the same. Taking the active slider resonant mechanism 402 as an example, Figure 4 As shown, it includes a first chute 4023, a first slider 4021, and a first elastic member 4022. The first chute 4023 is a square tube with both ends blocked. The first slider 4021 slidably engages with the first chute 4023, and a first elastic member 4022 is installed between the first slider 4021 and the first chute 4023. The first elastic member 4022 is specifically a compression spring, which is used to absorb energy and reduce vibration. Similarly, the chute of the passive slider resonant mechanism 403 is also equipped with a second slider 4031 and a second elastic member 4032.

[0063] Each slider resonant mechanism has a notch on its side, and a corresponding protrusion is mounted on the first slider 4021. The protrusion passes through the notch and pivots with the free ends of the two V-shaped connecting rods 2, forming a complete support structure. The difference is that the active slider resonant mechanism 402 also has a notch on its inside, and a hook is mounted on the slider of the active slider resonant mechanism 402 for connecting to the corresponding tuning spring 405.

[0064] Furthermore, multiple slider resonant mechanisms are symmetrically mounted on the lower portion of the main float 3. In one specific embodiment of the present application, eight slider resonant mechanisms are provided, comprising four active slider resonant mechanisms 402 and four passive slider resonant mechanisms 403, forming a U-shaped structure. The four active slider resonant mechanisms 402 are symmetrically arranged in the transverse direction, while the four passive slider resonant mechanisms 403 are symmetrically arranged in the longitudinal direction. Specifically, the two slider resonant mechanisms on each side are symmetrically arranged.

[0065] Therefore, the orthogonal stiffness transmission mechanism of a specific embodiment of the present application has four groups of V-shaped two-link rods 2, which are respectively located at four directions on the circumferential side and correspondingly connect the sliders of adjacent similar slider resonance mechanisms.

[0066] The tuning control system is connected to the servo motor of the sliding variable damping elastic actuation system 4 to adjust the damping. Figure 7 As shown, when adjustment is required, the tuning control system issues a command, which, after being analyzed by the servo motor driver, drives the servo motor in the longitudinal direction. As the slider of the linear motion mechanism 404 changes position, the length of the corresponding tuning spring 405 also changes. As a result, the magnitude and direction of the tension exerted on the first slider 4021 of the active slider resonant mechanism 402 also change, thereby changing the damping of the active slider resonant mechanism 402 and achieving active tuning. As a result, the floating embankment formed in a specific embodiment of the present application can adapt to dynamic load changes by adjusting parameters such as frequency and damping ratio in real time, which is a key hardware technology for improving wave dissipation capabilities.

[0067] On the other hand, the present application also provides a method for controlling an intelligent variable frequency tuning floating breakwater, which is used for variable frequency tuning of the aforementioned intelligent variable frequency tuning floating breakwater;

[0068] The steps include:

[0069] Collect initial wave data; perform data preprocessing on the initial wave data; the initial wave data can be collected independently or in combination through numerical simulation, physical model testing, and field measurements. Furthermore, when the data collection includes measured data, real-time wave observation and inversion reconstruction are achieved using a lidar deployed with the floating breakwater. During this process, motion compensation is performed using a floating body attitude monitoring system, such as RTK and inertial navigation, and the far-field free wave component is extracted as information for the measured input initial wave data.

[0070] Thus, the wave surface time series is constructed based on the initial wave data, that is, the wave surface time series is generated. These data provide the wave surface fluctuations at different positions at each moment. The first K snapshots are combined into a snapshot matrix Among them, snapshot is the vector composed of wave surfaces at different positions ( ), and the snapshot matrix is ​​used as the raw data input for subsequent analysis.

[0071] Since the data set may contain null values ​​or non-numeric data, the initial wave data is screened and eliminated for abnormal data during data preprocessing. Then, the validity of each data point is checked and only valid data is retained. Therefore, null values ​​may exist after the data is collected and eliminated. Therefore, time series interpolation is performed on the valid data to fill in the missing data in the time series to ensure the continuity and integrity of the data.

[0072] Based on the modal decomposition method and the initial wave data, data modeling is performed to obtain a wave prediction model. Specifically, Figure 8 As shown in Figure 2, the construction of the wave prediction model includes the following steps:

[0073] First, the preprocessed wavefront time series is divided into multiple windows, and the data in each window is independently subjected to higher-order dynamic mode decomposition (HODMD). HODMD is used because it is an efficient dimensionality reduction and feature extraction technique that can quickly process ocean dynamic data and capture its main dynamic modes.

[0074] Secondly, the data in each window is subjected to independent HODMD analysis, and the dynamic modes and characteristic information of the wavefront time series are extracted through high-order dynamic mode decomposition in the modal decomposition method. The signal V is reconstructed by the dominant mode, frequency, growth rate and amplitude obtained by decomposition. reconst , and extrapolate (predict) the next K p Wavefront information at a moment .

[0075] A wave reconstruction model is constructed based on dynamic modal and feature information, and the reconstructed signal and predicted signal output by the wave reconstruction model are subtracted from the corresponding original signal in the initial wave data to obtain a residual signal. Specifically, a long short-term memory network (LSTM network) is trained based on the residual signal to obtain a residual prediction model; wherein, the obtained reconstructed signal residual data is used to construct the LSTM network input, i.e. ; Use the prediction signal residual data to construct the LSTM network output, that is The LSTM model is trained using the Adam optimizer. By setting the learning rate, number of epochs, and other training parameters, the model's ability to fit the input and output of the training set is optimized, and the residual prediction data is output: After training is complete, the residual of the reconstructed signal is input, and the LSTM network outputs residual predictions for future time points. In the above steps, LSTM is used to deeply learn and predict the residuals of these patterns. Using the HODMD method as the baseline strategy and the LSTM method as the residual strategy not only retains the advantages of HODMD's fast response and processing speed, but also leverages the nonlinear data fitting capabilities of LSTM to further improve prediction accuracy.

[0076] Therefore, the aforementioned wave reconstruction model and residual prediction model are combined to obtain the wave prediction model, that is, the prediction results of HODMD and LSTM are added to obtain the total prediction value of the incident wavefront.

[0077] Therefore, in actual work, real-time wave data is collected by sensors deployed on site; then, the real-time wave data is pre-processed and input into the above-mentioned wave prediction model to obtain wave prediction information.

[0078] Establishing a mapping relationship between wave information and the state of the active tuned mass damper: Based on experimental data, a mapping relationship can be established between the tuning spring stiffness of a specific embodiment of this application under different wave conditions and the optimal wave-damming effect of the floating breakwater. Thus, based on the HODMD-LSTM combined prediction model, wave information can be predicted based on data collection over a period of time, and the active tuned mass damper can be adjusted based on this wave prediction information. In other words, a specific embodiment of the breakwater of this application can pre-adjust the frequency of the damping system based on measured data, allowing it to quickly and dynamically adjust to wave conditions and always maintain optimal protection.

[0079] In this application, the HODMD-LSTM prediction model decomposes complex tasks into simple tasks and residual tasks, providing a modular and progressive learning framework for reinforcement learning, which helps to solve problems such as training instability and low sample efficiency in deep reinforcement learning; the prediction model can maintain a high prediction accuracy under different working conditions, and even when environmental factors change significantly (such as improved sea conditions and changes in wave incident angles), it still shows strong generalization capabilities, which is better than traditional technologies; further, on the basis of the aforementioned embodiments, by supplementing actual measured training data, the model can continue to evolve itself, thereby ensuring the authenticity and reliability of the prediction results in long-term predictions.

[0080] Example 1;

[0081] Through physical model test design, the influence of spring stiffness on the shielding effect of the new structure under long-period incident conditions in this embodiment is verified.

[0082] The transmission coefficient is defined as the transmitted wave height / incident wave height. The test conditions were designed as follows: water depth d = 0.5m, draft a = 0.2m, wave periods T = 1.2s, 1.6s, 2.0s, and wave height H = 0.045m. The main buoy had dimensions of 0.6m × 0.4m × 0.99m and a draft of 0.2m. Tuning springs were installed at the four corners of the bottom, each 0.1m long and with stiffnesses of ∞ (rigid), 500N / m, and 1200N / m, respectively. The turbulence dissipation perforated plate at the bottom had circular uniform openings with an opening ratio of 0.2. The test scale was designed to be 1:16. The test results are shown in Table 1 below:

[0083] Table 1 is the results of the physical model test of Example 1:

[0084] .

[0085] The test results show that the spring stiffnesses corresponding to the optimal wave-damming effect within the test range are ∞, 500 N / m, and 1200 N / m, respectively, for wave incident periods of 1.2s, 1.6s, and 2.0s. In particular, under the condition of incident waves with a longer period (T=2.0s), the transmission coefficient behind the dike is reduced by approximately 15% through the appropriate design of the spring stiffness. This significantly improves the shielding effect of the floating dike under longer-period waves, effectively addressing the problem of poor shielding effect of the floating dike under longer-period waves.

[0086] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. An intelligent variable frequency tuning floating breakwater, characterized in that: It includes an installation base, an active tuned mass damper, a main floating body and a tuning control system; the installation base is connected to the main floating body through the active tuned mass damper; The active tuned mass damper is provided with an orthogonal stiffness transmission mechanism and a sliding variable damping elastic actuation system; The sliding variable damping elastic actuation system is installed at the lower part of the main floating body and includes a linear motion mechanism, a tuning spring and a slider resonance mechanism; The linear motion mechanism includes a servo motor, a lead screw, and a lead screw nut. The output end of the servo motor is coaxially connected to the lead screw. An inverted U-shaped connector is installed on the lead screw nut. The U-shaped connector is connected to the slider of the slider resonance mechanism through the tuning spring. The orthogonal stiffness transmission mechanism is a V-shaped two-link structure, the intersection of which is hinged to the mounting base, and the two free ends are respectively connected to the adjacent sliders of the slider resonance mechanism; A plurality of slider resonant mechanisms are symmetrically mounted on the lower portion of the main float, and sliders of some slider resonant mechanisms are connected to the tuning spring; The tuning control system is electrically connected to the servo motor in the sliding variable damping elastic actuation system for adjusting the damping.

2. The intelligent variable frequency tuning floating breakwater according to claim 1 is characterized in that: There are a plurality of slider resonance mechanisms distributed in a circular shape at the lower part of the main float; the sliding variable damping elastic actuation system is correspondingly provided with a plurality of sets of linear motion mechanisms; the linear motion mechanisms are installed in the longitudinal direction.

3. The intelligent variable frequency tuning floating breakwater according to claim 1 is characterized in that: The slider resonance mechanism includes a sliding groove, a slider and an elastic member; The slider is slidably matched with the slide groove, and the elastic member is installed between the slider and the slide groove.

4. The intelligent variable frequency tuning floating breakwater according to claim 1 is characterized in that: The installation base is a turbulence dissipation perforated plate.

5. An intelligent variable frequency tuning floating breakwater control method, characterized in that: The intelligent variable frequency tuning floating breakwater according to any one of claims 1 to 4 is used for variable frequency tuning; comprising the following steps: Collect initial wave data; Performing data modeling based on a modal decomposition method and the initial wave data to obtain a wave prediction model; Collect real-time wave data through sensors; Inputting the real-time wave data into the wave prediction model to obtain wave prediction information; A mapping relationship between wave information and an active tuned mass damper state is established, and the active tuned mass damper is adjusted based on the wave prediction information.

6. The intelligent variable frequency tuning floating breakwater control method according to claim 5, characterized in that: The construction of the wave prediction model includes the following steps: Collect the initial wave data independently or in combination through numerical simulation, physical model test, and offshore measurement; Constructing a wave surface time series based on the initial wave data; Extracting dynamic modes and characteristic information of the wavefront time series through high-order dynamic mode decomposition in the modal decomposition method; A wave reconstruction model is constructed based on the dynamic mode and characteristic information, and a reconstructed signal and a predicted signal output by the wave reconstruction model are respectively subtracted from the corresponding original signals in the initial wave data to obtain a residual signal; Training a long short-term memory network based on the residual signal to obtain a residual prediction model; The wave reconstruction model and the residual prediction model are combined to obtain the wave prediction model.

7. The intelligent variable frequency tuning floating breakwater control method according to claim 6, characterized in that: performing data preprocessing on the initial wave data; In the data preprocessing, the initial wave data is screened and eliminated for abnormal data, and the null values ​​are filled by interpolation; Extracting the dynamic mode and characteristic information of the wavefront time series also includes: The wavefront time series is divided into a plurality of windows, and independent high-order dynamic mode decomposition is performed on the data in each window.

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