29 results about "Irregular waves" patented technology

The invention discloses a multifunctional experimental device capable of realizing a wind wave coupling effect, which comprises a deep water experimental area, a transition experimental area and a shallow water experimental area, and is characterized in that a lifting floating bottom mounted at the bottom of a water tank can simulate the elevation change from a deep sea to a shallow sea seabed; a wind generating system is assembled above the water tank and is matched with the flow guide arrays on the two sides to provide a high-quality wind field for the experimental water tank; the L-shaped wave maker can make multi-directional irregular waves, the wave flow experiment water tank and the wind making system are used for constructing a target joint field required by an experiment, and the whole process that the waves are gradually propagated from deep sea to shallow sea under the wind wave coupling effect can be achieved. The device has multiple functions of wind generation, wave generation, current generation and the like, has the function of simulating various load factors which mainly influence ocean engineering structures, and compared with an existing experimental device, the device can achieve the real wind and wave coupling effect, more truly and completely simulate the whole process of ocean wave propagation, and the experimental device has the advantages of being simple in structure and convenient to use. And a more accurate marine simulation environment is provided for experiments.

The present invention relates to a method and system for predicting non - linear wave loads in ship structure design. When constructing the non - linear wave load prediction model STLN, a WLIP network model based on a neural network is constructed by using a numerical calculation data set of the ship to be designed; taking the model test regular wave data set as the target domain, knowledge transfer learning of non - linear wave loads is carried out to obtain a short - term prediction model FTLN for regular waves; for the short - term prediction model FTLN of regular waves, taking the model test irregular wave data set as the target domain, knowledge is transferred again for non - linear wave loads to obtain the non - linear wave load prediction model STLN; when predicting non - linear wave loads, for an irregular wave condition of the ship, the non - linear wave load prediction model STLN is used to obtain the wave load corresponding to the irregular wave condition. The present invention can quickly and accurately predict non - linear wave loads and meet the requirements in the ship structure design stage.

The invention provides a circular pool wave making system and a wave making and absorbing method, and belongs to the technical field of ocean engineering equipment.The circular pool wave making system comprises a plurality of wave maker units distributed around the circumference of a circular pool at equal intervals; the wave maker unit comprises a linear motor; the linear motor is connected with a floater through a connecting rod; the linear motor is connected with the driver, the driver is connected with the upper computer, the upper computer sends a control command to the driver, and the floater floats on the water surface and has a motion freedom degree of vertical translation. By controlling the movement of each wave maker unit in the circular pool wave making system, full-circumferential wave making is realized, regular waves, irregular waves, rotating waves, annular focused waves and other focused waves in any shape can be made, and meanwhile, waves propagated to the periphery of a pool are absorbed based on an active wave absorbing technology, so that the wave making efficiency is improved. Therefore, various wave making requirements, including simulation of real sea conditions and wave making of extreme sea conditions, are met.

The invention relates to the technical field of sea wave height prediction, and discloses a multi-scale physical enhancement type irregular sea wave prediction method which comprises the following steps: (1) collecting historical data of sea waves, preprocessing the data, and dividing a training set, a verification set and a test set; (2) decomposing the wave data into a high-frequency component, a medium-frequency component and a low-frequency component through wavelet decomposition; (3) constructing a WaveFormer model; (4) the WaveFormer model is trained, and (5) the test set is sent to the WaveFormer model to be trained, and a wave height prediction value is obtained. According to the method, an original wave sequence is decomposed into a high-frequency component, an intermediate-frequency component and a low-frequency component by adopting two-layer stationary wavelet transformation, the model captures multi-scale characteristics of irregular waves explicitly, the reasonability of wave prediction is ensured, sequence-level prediction is realized on the premise of ensuring the prediction precision, the prediction efficiency is improved, and the prediction cost is reduced. And a data driving item is constructed based on a wave prediction result, so that the model prediction accuracy is further improved.

The invention discloses a wave energy extraction power maximization control method based on improved model prediction control. The method comprises a wave module, a Kalman filter module, a model prediction control module based on an APO algorithm and a WEC module. An adaptive noise covariance estimation method is introduced into the Kalman filter, and covariance matrixes of process noise and measurement noise are dynamically adjusted to output more accurate wave excitation force. Model prediction is utilized to control MPC online optimization so that the MPC can adapt to changes of system dynamic characteristics, meanwhile, an MPC module calculates optimal sampling time, a prediction time domain and a control time domain at the current moment through an APO algorithm, better control input is generated to be used for adjusting the running state of a wave energy converter WEC, movement of the WEC is matched with waves, and power absorption is maximized. The method has the advantages that the absorption power of the wave energy converter of irregular waves is controlled and maximized by improving the model prediction module, so that the power can be maximized.

This invention discloses a method for predicting the wave height of irregular ocean waves based on numerical water tank simulation and a deep learning model. The method includes using a numerical water tank simulation combined with extreme weather conditions to generate a relatively complete dataset of irregular ocean waves; and constructing a deep learning model, TA-DCLSTM, for end-to-end training and prediction, effectively improving the prediction accuracy of wave height. This invention employs numerical water tank simulation to accurately reproduce wave dynamics, while incorporating extreme weather conditions to generate an irregular wave dataset. After preprocessing, the dataset is input into a deep learning model, proposing a time-series prediction model, TA-DCLSTM, based on a time attention mechanism and dilated convolution. Dilated convolution expands the receptive field, capturing multi-scale temporal features in the wave data, while the time attention mechanism assigns different weights to each time step, focusing on key features to achieve accurate prediction of the wave height of irregular ocean waves.

1. Name of the product in this design: Half skirt (ruffled trim, layered hazy gauze, irregular wave-like hem 26ssBBL708). 2. Intended use of this design: for wearing. 3. The key design features of this product are the combination of shape and pattern. 4. The image or photograph that best illustrates the design's key features: the front view. 5. Since the information is already clearly expressed in the submitted views, other views are omitted. 6. Other situations requiring explanation: The clothing models are only for better product display and do not require protection.

The invention relates to the technical field of wave making, in particular to a wave making method based on an underwater flat plate longitudinal pushing type wave maker. Wave surface equations of different wave surface positions are constructed according to the obtained geometric parameters of the wave maker and the motion parameters of the underwater flat plate; according to the input target wave parameter, determining the wave number of the target wave and the underwater flat plate amplitude required for generating the target wave; if the target wave is a regular wave, controlling an underwater flat plate to longitudinally move according to a simple harmonic motion rule according to the flat plate amplitude; and if the target wave is an irregular wave containing N angular frequency components, introducing a random phase, and driving the underwater flat plate to perform multi-frequency synthetic vibration according to the flat plate amplitude corresponding to each angular frequency component. According to the method, the wave surface equation of vertical movement of the two-dimensional underwater flat plate structure is derived based on the potential flow theory, and the transfer function is obtained by using the equation, so that accurate generation of regular waves and irregular waves can be realized through the underwater flat plate.

The application provides a flow field reconstruction and deduction method based on K-A theorem, and belongs to the technical field of ship hydrodynamics. First, multi-dimensional data such as the direction, amplitude, period, frequency and flow velocity of irregular waves are collected and integrated into high-dimensional wave vectors. Then, the KAN network with B-spline curve as a learnable function is used to map the high-dimensional input into a low-dimensional parameter list, obtain the amplitude, angular frequency and initial phase of the dominant equivalent regular wave, calculate the decoupling target function by constructing an equivalent wave superposition model, compare the decoupling target function with the true value to obtain a loss function, and then optimize the network parameters by backward propagation until convergence. Finally, based on the network output parameters, a wave superposition model is constructed to represent the real wave in the form of a series of interpretable regular waves superimposed in time sequence, so that efficient and accurate flow field reconstruction and deduction are realized.

The present application belongs to the field of ship hydrodynamics and motion prediction, and in particular to a device and method for predicting the hydrodynamics and motion of a ship coupled with ice, which first derives a Green function that satisfies the boundary conditions of the ice layer and the free surface, as well as all other conditions except the surface condition of the ship, and through the Green function, the differential equation of the velocity potential is converted into a boundary integral equation on the surface of the ship only, which introduces an extended surface at the waterline of the ship body to eliminate the influence of irregular wave frequencies; an asymptotic solution formula of the Green function is analytically derived, thereby establishing an approximate and effective solution program for the coupled interaction of the ship / wave / ice layer, and numerically calculating the results of the added mass, damping coefficient and wave exciting force of the ship body; through the method, the interaction mechanism of the water wave / ship / ice layer under different parameter characteristics can be deeply understood, and theoretical support is provided for the hydrodynamic problems, motion prediction and rational design of polar ships.

The invention relates to the technical field of wind power operation and maintenance, and particularly provides an embarkation operation feasibility judgment method and orientation design method for an offshore wind turbine operation and maintenance embarkation platform. The feasibility judgment method comprises the following steps: S1, simulating a random irregular wave time sequence based on a given sea condition sample, and determining a ship six-degree-of-freedom wave frequency motion response time sequence of a wind power operation and maintenance mother ship under the excitation of the random irregular wave time sequence; s2, determining a global motion time sequence of the tail end of the wave compensation trestle based on a ship six-degree-of-freedom wave frequency motion response time sequence of the wind power operation and maintenance mother ship; s3, performing reverse calculation based on the global motion time sequence of the tail end of the wave compensation trestle, and determining a compensation instruction time sequence of each compensation mechanism on the wave compensation trestle; and S4, on the basis of the compensation instruction time sequence of each compensation mechanism and the design limit data of each compensation mechanism, the feasibility of operation and maintenance embarkation operation of the wind power operation and maintenance mother ship is judged. According to the feasibility judgment method, the safety of the climbing operation can be improved.

The application provides an irregular wave slamming construction platform stress analysis method and system and a computer readable storage medium thereof. According to platform basic dimensions and wave basic parameters, a stress condition of the irregular wave slamming construction platform is directly, quickly and efficiently calculated based on a large amount of test measurement data. The defects of the direct calculation complexity, measurement cost and the like of the slamming pressure load prediction in the existing theoretical calculation and model test are solved.

1. The name of this design product: Silicone mold (irregular wavy disk). 2. Purpose of this design product: Silicone mold for making plates. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: Stereoscopic drawing 1. 5. Other situations that require explanation: Description of status changes: Refer to Figure 1-2 for the mold and the finished plate in the usage state.

The present application relates to the technical field of sea wave height prediction, and discloses a multiscale physical enhancement type irregular sea wave prediction method, comprising the following steps: (1) collecting marine wave historical data, preprocessing the data, and dividing the data into a training set, a verification set and a test set; (2) decomposing the wave data into three components of high, medium and low frequencies through wavelet decomposition; (3) constructing a WaveFormer model; (4) training the WaveFormer model; and (5) inputting the test set into the trained WaveFormer model to obtain a wave height prediction value. The present application decomposes the original wave sequence into three components of high, medium and low frequencies through two-layer stationary wavelet transformation, explicitly allows the model to capture the multiscale characteristics of irregular waves, ensures the rationality of wave prediction, realizes sequence-level prediction on the premise of ensuring prediction accuracy, improves the prediction efficiency, and constructs a data-driven item based on the wave prediction result, so that the model prediction accuracy is further improved.

The utility model discloses test equipment capable of reproducing a deep sea storm environment, and relates to the technical field of deep sea engineering. Comprising a wind tunnel located above a deepwater experiment pool and used for generating a wind field to simulate atmospheric boundary layer wind; the upper layer of the wind tunnel is provided with a plurality of wind generating devices, and the corners of the wind tunnel are provided with guide plates. The L-shaped wave making equipment is used for generating multidirectional ocean waves to simulate regular waves and irregular waves with different angles, different wave heights and periods; the wave dissipation platform is arranged opposite to the L-shaped wave making equipment and is used for eliminating reflected waves; the floating tank bottom is positioned in the deepwater experiment water tank and is used for simulating different experiment water depths; the trailer system is installed on the surface of the upper portion of the deepwater experiment pool and used for fixing or dragging an experiment model and installing an experiment measuring instrument. According to the utility model, the atmospheric boundary layer wind tunnel is combined with the deep pool, so that synchronous laboratory reproduction of sea waves and sea wind can be realized, and the effect of the ocean engineering structure can be accurately simulated.

The invention discloses a method for calculating a wave flow force shielding coefficient of a sea-crossing bridge pile group foundation, and belongs to the technical field of pile group foundation wave flow force research. The method comprises the following steps: making a bridge pier, a bearing platform and a pile group foundation in a scaling-down manner, simulating an application scene and installing in a test wave pool; irregular waves are generated in the test wave pool through a wave maker, and the wave height and period of the waves in the test model are simulated; the water depth, the wave height, the wave period, the pile diameter and the pile distance in the test wave pool and the wave flow force borne by the pile foundation are measured respectively; and a wave flow force shielding coefficient calculation formula is provided based on analysis of the on-way change rule of the pile foundation wave flow force shielding coefficient. Compared with a calculation method in the current specification, the calculation method provided by the invention provides convenience for single pile stress re-checking calculation in the pile group, the calculation precision is improved, the cost increase caused by too conservative engineering design calculation is avoided, and the engineering construction cost is effectively saved.

The present invention provides a hydrodynamic analysis method and system based on a multi-directional irregular wave spectrum, which is applicable to the field of hydrodynamic analysis technology. The hydrodynamic analysis method includes multi-directional irregular wave spectrum generation, model construction, frequency domain calculation, time domain calculation, mooring cable motion calculation, integrated solution, and parallel solution. The hydrodynamic analysis system includes a body definition module, a grid generation and inspection module, a solver pre-processing module, an equation group generation module, an equation group integration and separation module, a solver solution module, a solution model opening and saving module, a grid display module, a result display module, and a script processing module. By introducing mooring cable motion calculation, more accurate hydrodynamic analysis results of floating structures are obtained. The hydrodynamic analysis method is then integrated into a computer storage medium. A tree structure is introduced to store calculation equations during the iterative calculation process. The tree structure calculation tasks are distributed to multiple threads to achieve parallel calculation, maximize the utilization of computing resources, and shorten calculation time.

This invention provides a method for predicting linear wave loads in ship structural design, relating to the field of ship engineering structural design technology. Based on optimized Latin hypercube sampling and three-dimensional potential flow calculation, this invention constructs a dataset of hydrodynamic pressure fields and load components under regular wave conditions. It extracts the basis function system and establishes a linear mapping relationship between the combination coefficients and the loads. For irregular wave sea states, it interpolates to determine the state transition matrix and control matrix. Combined with the main wave disturbance force, it performs a time-series recursion of the combination coefficients, triggering local transient calculations at preset intervals, and performing sparse verification corrections on the recursive state. Finally, it outputs the load history in real time through the mapping relationship and statistically analyzes the extreme values ​​to generate a wave load design parameter table. This method replaces full-order solutions with low-dimensional recursion, triggering a small number of full-order verifications at preset intervals. While maintaining prediction accuracy comparable to full-order solutions, it significantly reduces computation time, providing efficient and reliable load input for ship structural design.

The application discloses a nonlinear multidirectional irregular wave and internal wave wave-making system and a control method thereof, and relates to the technical field of hydrodynamic experimental research. The system comprises a wave-making module, a monitoring unit and a processing module. The wave-making module is of a non-uniform height layering structure, and the height of the layering structure can be self-adaptively adjusted according to a target frequency band. The monitoring unit is used for collecting flow velocity and wave height in real time. The processing module is internally provided with a mode management module, a wave construction module, a displacement conversion module, an instruction output module, a closed-loop correction module and a monitoring calculation module. The method comprises the following steps: generating a target vertical velocity profile, inversely kinematically solving, driving output, real-time monitoring, closed-loop selective correction, special monitoring and automatic mode switching. The application realizes multi-mode high-precision wave making of surface waves, internal solitary waves, quasi-steady internal waves, broken internal waves and mixed waves, and solves the problems of vertical velocity distribution distortion, full-frequency band correction interference and lack of pertinence in internal wave simulation.

The application discloses a method for evaluating ship riding wave probability in irregular waves based on AIS data, which comprises the following steps: 1, establishing a probability density function of ship density based on ship AIS data; 2, selecting a representative route and multiple test points at equal intervals, and obtaining the probability of occurrence of a specific random sea state in a target sea area according to a wave scatter diagram of a sea area near the test points; 3, calculating the riding wave probability of a ship in random waves; 4, calculating the riding wave probability of a ship in a specific irregular wave of a test point of the representative route in random waves; 5, calculating the riding wave probability of the ship under each random sea state of the test point, and calculating the riding wave probability of the ship of other test points according to the same steps. The application solves the related problem of solving the riding wave motion of a ship in irregular waves, can predict the probability of the riding wave motion of the ship in irregular waves, the calculation result can directly obtain the riding wave motion probability of the ship in irregular waves, the solving precision is high, the efficiency is high, and the application is suitable for various ship types.

The application discloses a ball-shaped non-contact friction nanogenerator for efficiently collecting low-frequency wave energy, and relates to the field of wave energy collection.The ball-shaped non-contact friction nanogenerator is composed of a stator and a rotor, and the stator and the rotor correspond to the outer shell and the inner shell of a concentric ball respectively.A copper electrode on the inner surface of the outer shell and a polytetrafluoroethylene (PTFE) film on the outer surface of the inner shell form a non-contact TENG, which converts mechanical energy into electrical energy.The widely-distributed, low-frequency and irregular-peak wave energy can be collected to supply power to small electronic devices.The provided non-contact TENG is low in cost, simple in structure and stable in performance, and provides a feasible scheme for collecting / using irregular wave energy, and has important practical significance.

The invention discloses a method for solving motion response of a mooring aquaculture net cage under the influence of irregular waves, which relates to the technical field of ocean engineering structure motion attitude calculation, and comprises the following steps: acquiring a wave height time sequence of the irregular waves according to observed Jonswap spectrum parameters, and obtaining wavelets through fast Fourier transform; simulating a reproducible irregular wave load in the numerical simulation pool in a wavelet superposition mode; and based on the VOF model and the overlapped grids, adopting a local encryption grid in a key area of a flow field, and adopting a fluid-solid coupling method to simulate the attitude response of the floating aquaculture net cage structure model of the catenary anchor system under the action of irregular wave load in a numerical pool. Therefore, by adopting the method for solving the motion response of the mooring aquaculture net cage under the influence of the irregular waves, the uncertainty influence caused by generating random irregular waves does not need to be eliminated through long-time calculation, the calculation time is shortened, and identical irregular wave loads can be applied to different targets.

The invention provides a flow field reconstruction and deduction method based on the K-A theorem.The method belongs to the technical field of ship hydrodynamics, and comprises the steps that firstly, multi-dimensional data such as the direction, the amplitude, the period, the frequency and the flow speed of irregular waves are collected and integrated into a high-dimensional wave vector, and then a KAN with a B spline curve as a learnable function is used for obtaining a high-dimensional wave vector; high-dimensional input is mapped into a low-dimensional parameter list, the amplitude, the angular frequency and the initial phase of dominant equivalent regular waves are obtained, a loss function is obtained by constructing an equivalent wave superposition model, calculating a decoupling objective function and comparing the decoupling objective function with a true value, then network parameters are optimized through back propagation until convergence, and finally, the optimal network parameters are obtained. A wave superposition model is constructed based on network output parameters, real waves are represented in the form that a series of interpretable regular waves are superposed on a time sequence, and efficient and accurate flow field reconstruction and deduction are achieved.

The utility model discloses a swing type wave maker, which relates to the technical field of wave making, and comprises a support component, a swing type wave making component, a swing type wave making component and a swing type wave making component, and the swinging assembly is located in the supporting assembly. According to the device, firstly, the device is fixed through the fixing frame, when irregular waves need to be used, the asynchronous motor rotates, the output end drives the driving rod to rotate, belt wheels outside the driving rod are made to rotate, meanwhile, multiple sets of belt wheels at the bottom are driven to rotate through a belt, and multiple sets of rotating wheels are driven to rotate; a rotating rod at one end of the rotating wheel also rotates, so that one side of a connecting rod moves, the other side of the connecting rod is connected with a wave making plate, alternating and moving are carried out, irregular waves are formed, when regular waves are needed, a plurality of sets of electric push rods stretch out and draw back to drive a mounting frame to move, meanwhile, supporting wheels are used for supporting, and the regular waves are formed; the device can realize the formation of irregular waves so as to meet the use requirements of different scenes.

Disclosed in the present invention is a method for calculating offshore construction operability of an engineering vessel, comprising: step I, collecting three-hourly multi-peak spectral wave data of offshore construction areas, including wave heights and wave periods; step II, calculating three-hourly equivalent single-peak spectral wave heights and three-hourly equivalent single-peak spectral wave periods; step III, calculating three-hourly irregular wave spectra; step IV, using hydrodynamic analysis software to calculate a motion response amplitude operator of the engineering vessel; step V, using a frequency domain calculation method to calculate a motion response energy density spectrum of the engineering vessel; step VI, using the frequency domain calculation method to calculate a motion response value of each degree of freedom of the engineering vessel; and step VII, calculating the operability of the engineering vessel. The present invention solves the problems of low calculation efficiency and poor calculation accuracy of existing methods for calculating the offshore construction operability of engineering vessels.

The application discloses a kind of solving methods of irregular wave influence under anchoring aquaculture net cage motion response, it is related to marine engineering structure motion posture calculation technical field, including according to observed Jonswap spectrum parameter, obtain irregular wave height time series, and get wavelet by fast fourier transform, in numerical simulation pool by the way of wavelet superposition simulates reproducible irregular wave load;Based on VOF model and overlapping grid, by local encryption grid to the key area of flow field, and using fluid-solid coupling method in numerical tank simulates the posture response of catenary anchoring floating aquaculture net cage structure model under the action of irregular wave load. Therefore, by using the above-mentioned solving method of irregular wave influence under anchoring aquaculture net cage motion response, long-time calculation is not needed to eliminate the uncertainty influence brought by random irregular wave generated, the calculation time is shortened and the same irregular wave load can be applied to different targets.

The present invention provides a method that considers the flow characteristics of a unidirectional vortex-driven rift flow system, wherein a vertical coastal structure with a strong reflection effect on waves reflects the incident irregular waves and forms a large-scale negative vortex-driven rift flow system within the first standing wave wavelength in the reflection zone upstream of the structure. The method applies a simplified model of a nonlinear gentle slope equation accelerated by GPU parallelization to simulate a unidirectional vortex-driven rift flow system near a structure. The model has both accurate dispersion and higher computational efficiency. By comparing the incident wave spectrum of irregular waves in the model with the experimental results, the ability of the model of the present invention to generate random waves is verified. Based on the numerical model, the different flow characteristics of the unidirectional vortex-driven rift flow system compared to the common counter-vortex-driven rift flow system are demonstrated, and the influence of the wave reflection coefficient of the structure on the flow characteristics of the unidirectional vortex-driven flow system is analyzed.

The invention discloses a self-adaptive hydrodynamic load calculation method for a large-diameter single pile. The self-adaptive hydrodynamic load calculation method comprises the following steps: determining geometrical parameters of a large-diameter single pile foundation and establishing a coordinate system; determining a water depth and irregular wave surface time sequence; the discrete amplitude, circular frequency and wavelength of the irregular waves are obtained; distinguishing a low-frequency band and a high-frequency band according to the relationship between the wavelength and the single pile diameter; the wave load of the low-frequency band on the large-diameter single pile at the current moment is calculated; the wave load of the high-frequency band on the large-diameter single pile at the current moment is calculated; 5, the total wave load on the large-diameter single pile at the current moment is obtained through integration, the simulation process is started from the moment 0 to the preset moment T, and if the simulation time does not reach the preset moment T, the fifth step is executed again until the moment T is reached. According to the calculation method, the hydrodynamic load calculation of the large-diameter single-pile foundation is more accurate.

The invention discloses a method for determining a wind energy utilization coefficient of a semi-submersible fan, which relates to the technical field of marine sciences, and is characterized by comprising the following steps of: (1) determining an actual wind speed at an infinitesimal point of a fan impeller according to a blade element plane and a flow velocity triangle of the infinitesimal point; (2) determining an inflow angle; (3) correcting an axial induction factor a and a radial induction factor b; (4) according to the six-degree-of-freedom motion relation of the floating platform, the factors of the wave load of the irregular waves for generating the substantial influence on the wind speed are surging, heaving and pitching, and then the wind speed is determined; (5) determining an effective tip speed ratio under the wind wave load coupling influence; and (6) the influence factors of the wind energy utilization coefficient (Cp) are decomposed into the tip speed ratio and the pitch angle, and therefore a correction formula of the Cp is obtained.