65 results about "Marine currents" patented technology

The application discloses a sea area change monitoring method, device and equipment and a storage medium, and relates to the technical field of sea area monitoring. The method comprises the following steps: performing super-resolution reconstruction based on target sea area boundary data at a set monitoring frequency to obtain remote sensing images of the target sea area; extracting scattered planar vector patches of culture facilities from the remote sensing images; determining culture range patches of the culture facilities according to the outer convex surface boundary geometry of the midpoint element patch in the scattered planar vector patch; analyzing NetCDF sea current multidimensional data, generating format grid sets including different direction flow rates and wind speed value vector fields according to the step length of the set monitoring frequency; determining a regression coefficient map according to the spatial relationship between the different direction flow rates and the wind speed, and monitoring the culture facilities by using the regression coefficient map. The application takes into account the influence of flow rates, flow directions and wind speeds on the position distribution of the culture facilities, and can efficiently and accurately monitor the temporal and spatial changes of the culture sea area by combining the analysis of the NetCDF data.

The application discloses a marine buoy multi-source fusion positioning method and system based on a factor graph optimization, which acquires GNSS observation data, IMU measurement data and marine environment auxiliary data; a factor graph containing state nodes, GNSS position factors, IMU pre-integration factors and marine dynamics constraint factors is constructed, and wave and current theories are used to constrain buoy movement; in view of multipath effects, marine surface reflection geometry and marine root mean square wave height are combined to calculate a multipath weighting factor, and a GNSS covariance matrix is adaptively adjusted; according to IMU data, a sea state level is discriminated, and an edge window length and a trigger interval of incremental smoothing solving are adaptively linked and adjusted; through adjacent buoy ranging information, collaborative constraints are constructed, and based on Mahalanobis distance and chi-square distribution threshold value detection, abnormalities are detected and local reconstruction is performed. The application effectively suppresses marine surface multipath interference, slows down the accumulation of calculation errors during signal interruption, and realizes high-availability continuous positioning under limited computing power.

This application relates to the fields of SAR signal processing and marine remote sensing applications, and provides a method and apparatus for sea surface current field inversion based on electromagnetic vortex wave radar data. The method determines the Doppler spectrum using electromagnetic vortex wave radar image data, obtains the measured frequency position of the trough feature point in the Doppler spectrum, and determines the theoretical frequency position using the position and angle of the two main lobes and the angle of the trough feature point in the radar antenna pattern. Then, the difference between the measured frequency position and the theoretical frequency position is used to obtain the anomalous frequency offset. Next, the Doppler frequency offset caused by wind and wave motion is removed from this anomalous frequency offset to obtain the target Doppler frequency offset. Finally, the radial velocity of the sea surface is calculated using the Doppler frequency offset, thus realizing sea surface current field inversion. This effectively expands the applicability of the Doppler frequency shift-based ocean current inversion method and improves the application potential of electromagnetic vortex wave radar in sea surface current field detection.

The application discloses a scouring protection and active repair device for offshore wind power large-diameter single-pile foundation, relates to the technical field of offshore single-pile wind turbine foundation protection, and comprises a sand filtering and flow disturbing assembly and a scouring pit repair assembly, the sand filtering and flow disturbing assembly is arranged around the single-pile foundation to intercept and collect silt carried by sea current; wherein the scouring pit repair assembly comprises a lifting ring, a connecting rod and a silt scraping plate, the lifting ring is arranged on the outer wall of the single-pile foundation in a lifting and rotating mode, the silt scraping plate is connected with the lifting ring through the connecting rod, and the silt scraping plate pushes the silt collected by the sand filtering and flow disturbing assembly into the scouring pit under the driving of the lifting ring; and the application further comprises a monitoring assembly for monitoring the formation of the scouring pit around the single-pile foundation. The application integrates real-time monitoring, active repair and self-power supply functions, realizes sand filtering and flow disturbing, lifting and rotating silt scraping cooperative operation, accurately fills and resets the scouring pit, effectively inhibits the development of scouring, and significantly improves the safety and service life of the pile foundation.

This utility model belongs to the technical field of marine oil and gas and power development equipment, and discloses a vibration damping device for marine risers and submarine cables. The device includes a damping cylinder, a positioning component, a support rod, a sleeve half-ring, bolt holes, and bolts. The damping cylinder is rigidly connected to the sleeve half-ring via the support rod and consists of two symmetrical half-cylinder structures, which are bolted together and fitted around the marine riser or submarine cable. The positioning component can be quickly installed and removed, providing reliable axial positioning for the vibration damping device. This utility model achieves efficient vibration reduction based on the synergistic mechanism of added mass efficiency and hydrodynamic damping energy dissipation. It has a simple structure, convenient and diverse installation methods, and is unaffected by ocean current direction or component attitude, making it widely applicable to vibration control of marine pipelines.

The application relates to an unmanned underwater vehicle path planning method based on an improved SAC algorithm, and comprises the following steps: obtaining state data of an unmanned underwater vehicle in an underwater environment; a simulation experiment environment is built based on a Gym framework, physical parameters of the unmanned underwater vehicle, geometric shapes of seabed obstacles and current characteristics are simulated, and an interactive feedback mechanism of an environment state and unmanned underwater vehicle action is constructed; a path planning algorithm based on an improved SAC is constructed, a heuristic exploration mechanism is introduced on the basis of the SAC algorithm, heuristic actions are generated based on Euclidean distance or actions are generated through a strategy network, and a multi-target reward function is designed; state data is input into the path planning algorithm, actions of the unmanned underwater vehicle are generated through the strategy network, the value of the actions is evaluated in combination with a value network, network parameters are updated by using the interactive feedback mechanism, and a path planning strategy is optimized. Compared with the prior art, the application has the advantages of fast convergence in a complex underwater environment, good adaptability and the like.

The application provides a deep water taking submersible pump backflush device and a culture ship thereof, and belongs to the field of aquaculture and fluid conveying engineering. A solution of using a high-power submersible pump water intake mechanism and assisting with multiple sets of power balancing devices is adopted to dynamically balance the rotating torque of the submersible pump and the torsion effect of sea current impact on the water intake pipeline, and to realize stable and reliable deep water taking operation. The deep water taking submersible pump backflush device comprises a water taking pipe connected by multiple sections of pipelines to form a water conveying channel, and a submersible pump assembly is connected at the water inlet of the water taking pipe. The submersible pump assembly comprises a pump shell sleeved on the water taking pipe, a driving assembly connected to the inner cavity of the pump shell through a plurality of fixing rods, and a first propeller drivingly connected to the output end of the driving assembly. On the pump shell at the outer edge of the water inlet, a plurality of electric propeller assemblies with the same structure and the same number of sensors are symmetrically installed along the axial center of the water taking pipe.

This invention discloses a dual-buoy wave-current energy combined power generation device, comprising a connecting rod and two identical float power generation components. Each float power generation component includes a float upper shell, a support rod, a push rod, a ratchet transmission assembly, a speed-increasing assembly, and a generator. The two float components are hinged together by the connecting rod and oscillate relative to each other with the waves, using a lever principle to drive the push rod in a reciprocating motion. The ratchet transmission assembly converts the reciprocating motion into unidirectional rotational output, which is then accelerated by two stages of speed-increasing components to drive the generator, achieving dual-buoy coupled power generation. The lower shell of the float is conical to reduce seawater resistance and contains springs and vibration energy storage blocks to recover vibrational energy and improve wave energy utilization. This device uses a helical impeller to absorb ocean current energy; the blades are subjected to force perpendicular to the helical shaft, achieving unidirectional self-starting rotation. This invention features a simple structure, high transmission efficiency, and stable output. Through wave-current energy combined power generation and the dual-buoy coupling design, it significantly improves power generation efficiency and device stability.

The application discloses a floating body type wave energy coupling sea current energy seawater desalination device, and relates to the technical field of comprehensive exploitation and utilization of marine energy, comprising a ring-shaped floating body, a sea current energy utilization module arranged below the ring-shaped floating body, a disc type compression module arranged at the center of the ring-shaped floating body, and a wave energy utilization module arranged above the disc type compression module; a gearbox, a booster pump and a reverse osmosis device are installed on the ring-shaped floating body. The disc type compression module, the wave energy utilization module and the sea current energy utilization module are matched to realize seawater pressurization and simultaneous capture of wave energy and sea current energy, so that the marine energy is fully utilized for seawater desalination. The water desalination device has low cost, high efficiency, energy saving and no pollution. The three modules are integrated by using the ring-shaped floating body, the device is quickly installed, the installation cost is low compared with the existing fixed pile type, and the device can be installed according to actual use requirements.

This invention relates to the field of AUV motion control technology, specifically disclosing a three-dimensional autonomous docking control method for AUVs based on Fourier regularization and reward shaping. The method includes: establishing a five-degree-of-freedom kinematic and dynamic model of the AUV, defining the thruster thrust and rudder angle as a continuous motion space; constructing wave disturbance and ocean current disturbance environment models, simulating the real ocean environment based on wave spectrum theory and the Morison equation; establishing the geometric relationship and success constraints for AUV three-dimensional docking, defining the docking relative distance, axis deviation, and attitude mismatch; this invention, through a combined reward shaping and Fourier regularization mechanism, achieves a high final docking success rate in various harsh ocean environments such as wave disturbance, ocean current disturbance, and combined disturbances. Directional reward guidance enables the strategy to converge rapidly to the optimal solution, while frequency domain regularization ensures the accuracy of value approximation. The synergistic effect of these two mechanisms allows the controller to output precise thrust and rudder angle commands, satisfying both position and attitude constraints in three-dimensional docking.

This invention discloses a design method for marine energy utilization blades and the designed impeller. Based on a spherical profile lift-drag combined design concept, the marine energy utilization blade consists of a helical blade and two booster blades, one at the top and one at the bottom. The helical blade is determined by the initial airfoil line along the scanning path of the helical blade. The two booster blades are respectively connected to the upper and lower ends of the helical blade, and are determined by a bucket-shaped profile along the spherical arc guide line. The impeller consists of three sets of blades, a central shaft, and two end plates, all connected spherically. The three sets of blades are evenly distributed on the spherical profile. The central shaft is connected to the upper and lower end plates, providing support for rotation. The upper and lower end plates provide support and fixation, and are connected to the power generation device. This invention's impeller can achieve efficient and stable operation in omnidirectional low-velocity flow environments such as deep seas, and has advantages such as omnidirectional response to unpredictable ocean currents, high self-starting capability and operational stability, and optimized structural parameters for efficient operation.

The utility model is suitable for the technical field of electric power construction, provides a kind of offshore wind power foundation anti-scouring sleeve structure, including anti-scouring sleeve main part, the anti-scouring sleeve main part is set to offshore wind power foundation pile column periphery;Wherein, the anti-scouring sleeve main part is divided into continuously connected reverse-arc section sleeve and soil-entry section sleeve;The tangent of the upper edge of the reverse-arc section sleeve is parallel to the axial direction of offshore wind power foundation pile column.This scheme provides offshore wind power foundation anti-scouring sleeve structure, solves the current offshore wind power foundation pile column by tidal current, wave and tide effect, leads to the problem of soil loss of soil layer around pile.

The present application relates to the technical field of virtual simulation and fluid modeling, in particular to a sea current prediction and visualization method based on digital twinning, comprising the following steps: S1, setting a boundary water level and a terrain elevation to calculate an initial flow velocity field, and generating a projection velocity field satisfying an incompressible condition through projection correction; S2, generating a disturbance mapping by combining a difference value of the projection field and the initial field, a terrain gradient and a boundary change rate, and marking a potential visual discontinuous area; S3, constructing a terrain-sensitive disturbance factor to modulate a velocity input, driving a wave and particle system, and realizing smooth transition and consistent evolution of a physical field and a visual rendering system. The present application realizes the fusion effect of high consistency between physical precision and visual performance of sea current simulation under complex terrain by constructing a disturbance-modulated physically consistent velocity field and driving the wave and particle system to evolve cooperatively.

This invention discloses a self-weight backfilling submarine cable protection device, comprising: an upper cover shell, a lower trough, a fixing base, and guide wings; the upper cover shell and the lower trough are detachably connected; the fixing base is disposed at both ends of the lower trough for limiting the submarine cable; the guide wings are symmetrically disposed on both sides of the lower trough and integrally formed with the lower trough; a backfilling trough is provided inside the lower trough, and the backfilling trough is placed between the fixing bases; this invention reduces the construction difficulty of the protection device and improves the convenience of underwater installation while ensuring structural stability; it optimizes and weakens the scouring effect of ocean currents on the seabed and the sediment around the cable; it achieves long-term stability of the backfilled sediment, preventing secondary scouring that could lead to cable exposure; and it meets strength requirements while improving the device's corrosion resistance and service life in the marine environment.

The application discloses a marine buoy multi-source fusion positioning method and system based on a factor graph optimization, which acquires GNSS observation data, IMU measurement data and marine environment auxiliary data; a factor graph containing state nodes, GNSS position factors, IMU pre-integration factors and marine dynamics constraint factors is constructed, and wave and current theories are used to constrain buoy movement; in view of multipath effects, marine surface reflection geometry and marine root mean square wave height are combined to calculate a multipath weighting factor, and a GNSS covariance matrix is adaptively adjusted; according to IMU data, a sea state level is discriminated, and an edge window length and a trigger interval of incremental smoothing solving are adaptively linked and adjusted; through adjacent buoy ranging information, collaborative constraints are constructed, and based on Mahalanobis distance and chi-square distribution threshold value detection, abnormalities are detected and local reconstruction is performed. The application effectively suppresses marine surface multipath interference, slows down the accumulation of calculation errors during signal interruption, and realizes high-availability continuous positioning under limited computing power.

The application discloses a kind of optimal survey line planning method and device for seismic exploration based on ocean current prediction, method includes: obtaining the candidate survey line set in exploration area, obtain the ocean current prediction data in preset planning time window;Establish towed bird angle prediction model, according to ocean current prediction data, determine the expected feather angle and risk index of each candidate survey line in candidate survey line set at each time by using towed bird angle prediction model;According to the expected feather angle and risk index of each candidate survey line in candidate survey line set, screening is carried out according to the first preset constraint condition, determine the feasible time window set of each candidate survey line;According to the feasible time window set of each candidate survey line, the optimization result containing the execution order and time window of each candidate survey line is determined by using the second preset constraint condition and multi-objective cost function, and the survey line pushing instruction set of ship is generated according to the optimization result. The expected feather angle and risk index are actively predicted before operation using ocean current prediction data, and the operation safety is improved.

The present application relates to a kind of unmanned ship cluster surveying and mapping cooperation method, system, equipment and medium, method includes: based on surveying and mapping task parameter constructs ideal space-time topology matrix containing the time sequence relationship of each ship expected position;Obtain the current actual position of each ship, current speed, local sea current disturbance vector and adjacent ship actual position and communication link quality index;Based on ideal space-time topology matrix and adjacent ship actual position, the space-time topology consistency error vector between this ship and each neighbor is calculated;According to space-time topology consistency error vector, construct virtual gravitational field, according to the actual distance between ships, construct virtual repulsive force field, and according to communication link quality index and sea current disturbance vector, the action weight of gravity and repulsive force is dynamically adjusted, and is weighted into virtual resultant force;According to virtual resultant force, the expected heading angle and the motion control instruction of updated speed are generated.

A deep-sea, unpowered, autonomous burial device and its operating method include a burial rod with an internal cylindrical flow channel and four axially symmetrical horizontal flow channels connected to the cylindrical flow channel around its perimeter. A limiting boss assembly is installed externally on the burial rod, consisting of an upper and lower limiting boss arranged at an interval. A piston assembly is installed inside the cylindrical flow channel. A sliding assembly is fitted onto the burial rod between the upper and lower limiting bosses, and a rotating assembly is installed externally on the sliding assembly. The device uses the force of ocean currents absorbed by a propeller as power input. Through the adaptive deformation of the propeller blades, the propeller repeatedly rises and falls. Combined with the design of the piston, one-way valve, and internal flow channels of the support rod, it achieves intermittent suction of seabed silt at the bottom of the support rod, gradually inserting the support rod into the seabed until complete burial.

The application discloses an Arctic shipping route navigation safety evaluation method and system based on multi-source data fusion and ship adaptability, and relates to the cross technical field of marine navigation safety guarantee, meteorological and hydrological data analysis and intelligent navigation. The method comprises the following steps: collecting multi-source data of the Arctic shipping route, dynamically fusing weights in combination with real-time reliability calculation of the data source after preprocessing and space-time alignment, completing confidence dynamic weighted fusion to obtain comprehensive environmental data; constructing a coupled physical stress model based on the data and inherent parameters of the target ship, introducing ice type and sea current factors to quantify real-time navigation risk, and generating a voyage full-cycle dynamic risk corridor; planning a route based on the risk corridor by using a hybrid heuristic algorithm, and combining a multi-index judgment mechanism with a self-defined weight to realize navigation safety grade judgment and global optimal route output. The application improves evaluation accuracy and ship adaptability, prolongs the dynamic prediction period, realizes global optimal route planning, and has strong operability in decision support.

The application discloses a power distribution method for smooth straight sailing of an underwater chain robot, which mainly comprises two steps. First, the driving distribution characteristics of the underwater chain robot, the initial state and the target state are given, and the driving force size to be adopted by each unit in the next execution period is optimized based on a genetic algorithm. Second, a penalty function is established by considering the input saturation condition of the unit driving force, and the penalty function is added to the objective function of the genetic algorithm power optimization, so that the driving force size actually adopted by each unit in the next execution period is determined, and the interval between each unit is restored to an ideal state as soon as possible under the consideration of the constraint. The genetic algorithm and the penalty function are effectively combined to realize the fast and smooth straight sailing of the underwater chain robot under any disturbance or initial state. The application has the characteristics of clear and clear principle, effective method verification and the like, and can be widely applied to the power distribution task of the smooth straight sailing of the power distributed multi-body underwater robot, and can cope with the disturbance of different sea current environments.

The application discloses a scouring prevention device for offshore wind power pile foundation and a construction method thereof, wherein the scouring prevention device comprises a flow guiding component and a scouring prevention component; the flow guiding component comprises a flow guiding structure formed by at least two flow guiding blocks; the flow guiding structure is sleeved on the outer periphery of the wind power pile foundation and located on the seabed; the side of the flow guiding block away from the wind power pile foundation is provided with an inner concave arc surface; the scouring prevention component comprises a support seat and a first connecting piece; a plurality of support seats are uniformly distributed around the wind power pile foundation in a ring shape; two adjacent support seats are connected through the first connecting piece to form a protection ring; a plurality of protection rings are arranged at intervals outside the wind power pile foundation; two adjacent protection rings are connected through the first connecting piece to form a protection net; and part of the protection nets are arranged on the flow guiding blocks. Through the arrangement of the inner concave arc surface of the flow guiding block, the scouring prevention device can smoothly guide and disperse the oncoming sea current impacting the flow guiding block, avoid the formation of local stagnation point high pressure and high-speed turbulence on the oncoming surface, and reduce the local scouring of the seabed outside the flow guiding block.

This invention relates to an anti-scour device and its installation method for offshore wind turbine foundations. The anti-scour device includes an anti-scour net embedded in a riprap layer surrounding the wind turbine foundation. The anti-scour net comprises several tire assemblies and several ropes. The tire assemblies are spaced apart, and adjacent tire assemblies are connected by ropes. Each tire assembly includes a large tire and a small tire arranged concentrically, with the small tire located inside the large tire. The large and small tires are connected and fixed together by connectors. By installing the anti-scour net, composed of tire assemblies and ropes, around the wind turbine foundation, the riprap layer is secured. Because the tire assemblies are embedded in the riprap layer, the scour effect of ocean currents on the riprap layer is reduced, preventing displacement of the riprap and the formation of craters, thus ensuring the stability of the wind turbine foundation.

The present application relates to a kind of deep-sea small power generation device, the deep-sea small power generation device is designed for deep-sea low flow rate condition, using ultra-low speed (rotational speed is equal to and lower than 1 revolution / second level generator) horizontal axis structure disc generator realizes the conversion of ocean current energy to electric energy.Temporary generator is driven as motor by adopting reverse drive generator mode.Using the way of separating power generation part and electrical part, they are sealed respectively.Using universal shaft structure realizes automatic direction adjustment.Seawater is evenly distributed after passing through the front fairing of von Karman curve shape, then washes the paddle with two plane curvatures, rotates the rotor by bearing, cuts magnetic line and generates electricity.The present application simplifies power generation device, electromagnetic pulsating torque is very small, rotating part has no core, moment of inertia is small, especially suitable for frequently starting and braking occasions, energy conversion rate is high, power generation efficiency is high, removes the traditional sealing ring, service life is long, maintenance is simple, safe and environmentally friendly.

A self-contained, offshore, underwater nuclear power plant is housed within a hull mounted to the seafloor. An electric line extends from the offshore power plant to an onshore electric load to power the electric load. The body of water provides a heat sink for the power plant, and protection from surface weather, waves, and currents. The hull mounts to the seafloor via a dampener that reduces the transfer of seismic activity from the seafloor to the hull. The hull and power plant may be manufactured at an onshore facility and transported to an offshore location of operation on the seafloor. After completion of a fuel cycle, the hull and power plant may be transported from the offshore location of operation to an onshore maintenance / refueling facility for refueling, repair and later, when obsolete or damaged, for decommissioning.

The embodiment of the present application provides a sea current power generation system. The sea current power generation system comprises a column group stand, a floating plate assembly and an energy conversion device. The column group stand comprises a column stand and a sliding spoiler, the sliding spoiler is arranged on the column stand and can reciprocate, one end of the floating plate assembly is hinged on the sliding spoiler and can swing in the up-down direction relative to the column stand, the energy conversion device comprises a hydraulic power generation unit, a first hydraulic component and a second hydraulic component, the first hydraulic component is connected with the sliding spoiler and can stretch and contract under the reciprocation of the sliding spoiler, and the second hydraulic component is connected with the floating plate assembly and can stretch and contract under the swing of the floating plate assembly. Therefore, the sea current power generation system according to the embodiment of the present application has the advantages of improving the power generation efficiency and power density.

This invention discloses a float-type power generation device that combines wave and current utilization, addressing the technical problems of single-source marine energy utilization and low power generation efficiency in existing power generation devices. It includes a float power generation component, a turbofan power generation component, and a support column. During operation, the float, under the influence of wave forces, undergoes relative oscillation motion with the support column. A hydraulic cylinder, driven by a rigid disc, converts the mechanical energy absorbed by the relative motion into hydraulic energy. The hydraulic energy is converted into kinetic energy by a rotating hydraulic motor, which in turn drives a generator to generate electricity. The turbofan power generation component is rigidly connected to the support column. During the oscillation motion of the float, the turbofan, under the influence of ocean current forces, maintains rotation in one direction, continuously generating electricity through a transmission mechanism. The turbofan and float hydraulic systems each employ an independent transmission mechanism, enabling effective comprehensive utilization of wave and tidal energy and improving the utilization rate of marine energy. The device's transmission system has a simple structure and high energy transfer efficiency.