29 results about "Wave loading" patented technology

This invention discloses a water damping connection device for a floating photovoltaic pontoon breakwater, belonging to the field of marine engineering technology. It includes a water damping mooring device installed at both ends of the pontoon breakwater, with the connection ends of the pontoon breakwater being open. The water damping mooring device includes a water tank, a bottom plate, tie rods, a push plate, and a compression spring. The water tank is open at both ends and installed inside the pontoon breakwater. The bottom plate is connected inside the pontoon breakwater. The push plate is placed inside the water tank, with a tie rod fixedly connected to one end away from the bottom plate. The tie rods at both ends of the pontoon breakwater are connected via universal joints. The compression spring is sleeved on the tie rod, with one end fixedly connected to the push plate and the other end fixedly connected to the opening of the water tank. A check valve is provided on the push plate, controlling the water flow from the bottom plate towards the universal joint side. Through the annular gap design between the push plate and the inner diameter of the water tank, when the wave load increases, the push plate moves to compress the compression spring, and simultaneously, the water flows in the annular hole, generating water damping and effectively attenuating the peak connection force.

A concave windshield with a raised center that curves upwards to transfer wind pressure to the top; the concave sides of the windshield are designed at an angle of 40° to 60° to the ship's centerline, with the specific angle offset by 5° to 10° from the main deck line; a horizontal girder is installed at the center of the concave section and at the top of the cable guide hole, and a platform structure is installed in the middle of the horizontal girder to improve the structural strength at the load concentration point of the windshield; vertical girder is installed in the middle and on the sides of the windshield, and a strong structure is installed at the bottom of the middle vertical girder to resist the wave load.

The present application relates to the technical field of structural response simulation, in particular to a ship container wave pressure intensity simulation method and system, in the present application, based on Fourier transform, frequency value, direction angle, energy coefficient, pressure amplitude and phase quantity are composed into a unified frequency domain vector, and the surface element pressure history is reconstructed by time step by time, so that the wave load is uniformly distributed in the spectrum domain phase, the frequency component phase superposition and the speed and heading offset are synchronously transmitted to each time point, the surface element pressure history and the sea state spectrum parameters are one-to-one corresponding, through the penalty function method, the displacement difference value and the allowable gap limit value are read at the node layer, the penalty coefficient is selected according to the constraint type to generate the penalty quantity, and the penalty quantity is superimposed to the node pressure record with the time step, the supporting, limiting and allowable movement state is quantified as the penalty term and is updated with the iteration increment, the constraint strength is uniformly controlled by the penalty coefficient grade table, and the working condition switching can reuse the grid and material input by replacing the matrix and penalty coefficient library.

The present application belongs to the technical field of offshore renewable energy comprehensive development, and discloses an integrated device of a floating wind turbine-oscillating buoy wave energy device. A rigid connecting rod is driven by a float to generate electricity, and a lattice design is formed on the wave-affected part of the side column to reduce the wave-affected area and load. An energy-gathering arc-shaped plate is arranged on the side surface of the side column, and is controlled by a control terminal to form reflected energy gathering by lowering, to improve the wave energy conversion efficiency, or to be lifted to reduce the wave load. The wind turbine tower is extended downward, and a plurality of heave plate structures are arranged at the bottom to improve the overall system stiffness, effectively reduce the heave motion of the overall system, increase the relative motion of the overall system and the oscillating buoy, and improve the energy conversion efficiency. The present application reduces the wave load of the floating wind turbine equipment in severe sea conditions, improves the survival ability, durability and stability of the integrated equipment, gathers waves and extracts wave energy through the oscillating buoy wave energy conversion device, and realizes the complementary and efficient development of "wind-wave" energy in space and time.

% Disclosed is a non-probabilistic model-based intelligent reliability assessment method for corrosion damage to a ship hull structure. The method includes: collecting corrosion data of the ship hull structure, and performing interval processing on the data through an embedded data processing system to obtain a mean and deviation of a residual corrosion thickness; determining a resistance of the ship hull structure through hull structure resistance calculation software; measuring external load data such as wind and wave loads, sailing speed, and cargo's center of gravity, and determining external loads based on geometric characteristics of the ship hull structure; establishing a failure function and simulating a failure mode of the ship hull structure in a failure analysis module; and solving a non-probabilistic reliability index of the ship hull structure through an interval variable normalization algorithm, and displaying an assessment result and giving an early warning through a ship safety management system.

This invention relates to an experimental apparatus and method for simulating ship motion under severe sea conditions, belonging to the field of ship wave load testing technology. It addresses the problem that existing severe sea condition wave load testing technologies are insufficient in simulating realistic waves under actual sea conditions, such as high wave heights, distorted waves, and breaking waves. The wave-generating system includes a wave-generating plate located at one end of a water tank and swinging along the length of the tank, and a driving component for driving the wave-generating plate's swing. The nonlinear wave generation system includes a wave-generating rod and several jet pipes. The wave-generating rod is arranged along the width of the water tank and slidably set along the height of the water tank via a height adjustment component. The jet pipes are all located at the bottom of the water tank. This invention enables the simulation of the water-air mixture flow field and accurate measurement of loads in distorted and nonlinear waves under severe sea conditions. It allows for a wide variety of experimental types and diverse functions, and can replace the expensive and costly towing tanks used for general ship models.

The application discloses a kind of water power analysis method and system, the method includes establishing the wet surface model of offshore comprehensive test platform;Extract the strut structure data of the slender body feature in wet surface model, and the strut structure data is generated morrison model;Water dynamic model is constructed based on wet surface model and morrison model, and water dynamic calculation result is obtained by using the water dynamic model calculation wave load transfer function;Water dynamic calculation result is analyzed to obtain final analysis result by the form of numerical list and broken line chart.The application can more accurately simulate the actual stress condition of offshore platform under the action of wave, so as to improve the effectiveness and reliability of design.

The application relates to a segmented ship model for dynamic test of seakeeping pool and a test method, which comprises: segmented ship hulls, the number of which is N, arranged along the length direction of the ship model, and adjacent two segmented ship hulls are connected through rubber film, so that the N segmented ship hulls are connected to form the hull shell of the ship model; a measuring beam, which is segmented along the length direction of the ship model, the number of the segments being M, each segment being a segmented beam; a fixing structure assembly, which is used for fixing and connecting the segmented beam and the corresponding segmented ship hull; and a measuring structure assembly, which is used for connecting adjacent two segmented beams, each measuring structure assembly corresponding to a segment of the hull shell, and the measuring structure assembly is used for simulating the rigidity and section modulus of the actual ship at the segment of the ship model, so that the model test research can be simultaneously carried out on the wave load characteristic law and the dynamic limit bearing capacity of the hull, and the safety verification of the ship structure design can be more accurately carried out.

The application provides a stamping process energy-saving method and system based on fluctuation load hedging, and relates to the technical field of beat control. The method comprises the following steps: collecting the load signal of each stamping machine in each stamping cycle in real time, identifying the peak load mutation point corresponding to the main blanking or stretching process in the cycle, and taking the peak load mutation point as the current cycle phase reference point of the stamping machine; obtaining the timestamp of the current cycle phase reference point of each stamping machine relative to the unified time reference, and calculating the phase difference between any two stamping machines; when the phase difference between two stamping machines is less than a preset safety threshold, at least one of the two stamping machines is selected as a target stamping machine; a compensation time amount is determined according to a preset compensation rule, and a beat adjustment instruction is sent to the target stamping machine, so that the starting time of the next stamping cycle of the target stamping machine is advanced or delayed by the compensation time amount relative to the original starting time, so as to increase the phase difference between the two stamping machines.

This invention belongs to the field of integrated development technology of offshore renewable energy, and discloses an integrated device for a fixed monopile wind turbine-oscillating buoy wave energy conversion system. It includes wind turbine equipment, an oscillating buoy wave energy conversion device, a fixed monopile foundation, a control system, and a power transmission system. The fixed monopile foundation comprises a lower wind turbine foundation, a lattice-type structure, and an upper wind turbine foundation connected in sequence; the lattice-type structure is located in the wave action zone. The oscillating buoy wave energy conversion device includes a permanent magnet linear generator, an oscillating buoy, a straight shaft, a concentrating arc plate, a buoy shield chamber, and a buoy draft control mechanism. The concentrating arc plate is arranged on the upper wind turbine foundation, and its up-and-down movement is controlled by the control system. This invention reduces the wave load on the fixed monopile wind turbine equipment under harsh sea conditions, improving the survivability and durability of the integrated equipment; simultaneously, through the oscillating buoy wave energy conversion device, it achieves wave concentration and wave energy extraction, realizing the complementary development of "wind-wave" energy in time and space.

The application discloses a variable tension leg type special-shaped pontoon bridge foundation, and relates to the technical field of floating foundation structures. The foundation comprises a pontoon main body, a plurality of tension leg systems and a plurality of tension legs. The pontoon main body is used for being connected with the bottom of a bridge pier and providing buoyancy. A plurality of variable hydraulic rod systems are circumferentially and intervalled arranged on the outer side of the pontoon main body. Each variable hydraulic rod system can be adaptively stretched and contracted when the pontoon main body is horizontally or vertically displaced. One end of each tension leg is connected with one variable hydraulic rod system, and the other end is used for being connected with a seabed foundation. The pontoon main body is arranged at the bottom of the bridge pier, thereby providing a floating foundation for the bridge pier. When the pontoon main body is horizontally or vertically displaced, the plurality of variable hydraulic rod systems are adaptively stretched and contracted, thereby cooperating with the tension legs connected with the seabed foundation, so that the wind and wave load resistance performance of the overall structure is improved, and the pitching and rolling of the bridge are reduced.

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.

This invention discloses a multi-degree-of-freedom wave compensation parallel platform, comprising a base, a rigid constraint assembly, a motion platform, a controller one, a controller two, a gyroscope, a posture sensor, a buffer unit, and a flexible traction assembly. Each branch, from the fixed platform to the motion platform, consists of a motor, a reducer, ropes, and fixed pulleys. Its operating method is also disclosed. This parallel platform employs a rope-driven rigid-flexible drive, combining the advantages of high rigidity and precision of traditional rigid parallel mechanisms with the advantages of low inertia and a large working space of rope-driven parallel mechanisms. The parallel platform uses a buffer structure to effectively reduce the impact of wind and wave loads on the platform. This invention, employing a rope-driven rigid-flexible drive, has a simple structure and can effectively achieve wave compensation.

This invention provides a steel-concrete floating platform with a roll reduction mechanism. The suspended main body includes a central column and multiple side columns. A wind turbine is installed on the top of the central column, and the bottom is anchored to the seabed via a mooring system. A central liquid storage tank is installed inside the central column, and multi-functional integrated compartments are installed in each side column. The central liquid storage tank and the multi-functional integrated compartments are connected by horizontal connecting pipes. When the platform is excited by high-frequency waves, the roll reduction system uses liquid to circulate back and forth between the central liquid storage tank and the multi-functional integrated compartments, generating reverse inertial force and damping force to suppress high-frequency vibration. When the platform is excited by low-frequency waves and tilts at a large angle, the liquid sloshing in the multi-functional integrated compartments generates a reverse overturning moment, and the energy is dissipated through an energy dissipation mechanism to suppress low-frequency rigid body motion. By adjusting the liquid level in the multi-functional integrated compartments, the platform's center of gravity is adjusted simultaneously, and the natural frequency of the roll reduction system is tuned, effectively covering the entire frequency band of wave loads.

This invention discloses a finite element analysis method and system for the yield buckling strength of a marine integrated test platform. The method includes establishing a finite element model of the platform for marine integrated testing; obtaining the peak value of the wave load transfer function based on the design wave method and the hydrodynamic calculation results of the hydrodynamic model, selecting design wave parameters, and applying the corresponding wave loads to the entire platform finite element model; solving the structural finite element model to obtain the calculated results of nodal stresses and nodal displacements; and analyzing the calculated results of the nodal stresses and nodal displacements to generate a stress contour map. This invention enables the structure to withstand environmental loads within its design service life and meets the strength requirements under design conditions.

The application discloses a wave load calculation analysis method and device, which constructs a platform overall structure finite element model; determines wave frequency, wave direction angle, wave amplitude and lag phase which cause maximum wave-induced load; inputs the wave frequency, wave direction angle, wave amplitude and lag phase to the platform overall structure finite element model to calculate the structure response and output load calculation analysis results. The application improves the prediction accuracy of the response of the offshore comprehensive test platform under the action of waves. The performance of the platform structure under extreme wave conditions can be evaluated, and the basis for structural design and safety evaluation is provided.

The present application relates to a kind of geosynthetic reinforced coral sand filter type seawall structure, including seawall foundation system, seawall facing system and seawall core system;Seawall foundation system includes coral sand fill foundation, geosynthetic bag reinforced crushed stone pile and geosynthetic material reinforced graded crushed stone cushion, geosynthetic bag reinforced crushed stone pile is arranged in coral sand fill foundation, geosynthetic material reinforced graded crushed stone cushion is set in the top of coral sand fill foundation;Seawall facing system includes ecological geotextile bag, concrete block stone subgrade surface layer and gabion;Seawall core system includes backfilling coral sand, twisted metal net and sand bag, twisted metal net is set in backfilling coral sand and is connected with gabion, and the side of backfilling coral sand in sea is provided with sand bag.Compared with prior art, the present application effectively improves the stability of seawall under wind wave load and seismic load, and the multi-level filter measures effectively solve the problem that internal fine particles are prone to loss under long-term wave load.

This application provides a force simulation device and method for a floating platform carrying a drone payload. A first water tank with a first space containing a solution is placed on the platform, and a second water tank is placed within the first space and floats on the solution. By changing the draft of the second water tank, as well as the wave height, wave period, density, and viscosity of the solution, the force simulation of the floating platform under the influence of seawater wave load is achieved. Furthermore, the real-time position information of the payload collected by the data acquisition and transmission module guides the drone's landing. The simulation device proposed in this application is characterized by its simple structure, low cost, and ease of implementation. By achieving geometric similarity, Vlad number similarity, and Reynolds number similarity between the simulation device and the floating platform, the operating principle of the simulation device can closely approximate the actual situation, making the simulation method practical.

The present application belongs to the technical field of ocean renewable energy development and utilization, and discloses an integrated device of a floating structure-oscillating water column wave energy conversion device. A vertical column and a lateral support column form a lattice design, reducing wave load and ensuring structural stability. Energy concentrating plates are arranged on the side of the vertical column. The control system controls the movement of the energy concentrating plates to form reflected energy concentration after monitoring by the monitoring system, improving wave energy conversion efficiency. At the same time, the energy concentrating plates are lifted under extreme sea conditions to reduce wave load. A flow regulating system is arranged inside the air chamber of the oscillating water column wave energy conversion device to regulate the flow of air in the air chamber into the turbine generator, so that the power generation efficiency of the turbine generator reaches the maximum value, improving the conversion efficiency of the device. The present application has stable structure, high energy conversion efficiency, strong adaptability and high survival ability under extreme sea conditions, and can concentrate waves through the oscillating water column wave energy conversion device.

This invention provides a machine learning-based method for predicting the fatigue life of top-tensioned riser stress joints. Taking the top-tensioned riser stress joint as the object, it uses finite element analysis (FEM) tools for parametric modeling and batch solving. Latin hypercube sampling is employed to generate multiple sets of structure-load parameter combinations. A high-quality fatigue life dataset is constructed by combining rainflow counting, Miner's linear cumulative damage theory, and the Goodman correction criterion. After data preprocessing and feature engineering to select key features, a machine learning regression model is used to achieve high-precision prediction of fatigue life, simultaneously outputting the number of fatigue cycles and equivalent service life. Compared with traditional methods, this invention offers higher prediction efficiency, superior accuracy, better engineering adaptability, and stronger robustness. It can solve the problem of fatigue damage and fracture of top-tensioned riser stress joints in deep-sea oil and gas development due to long-term exposure to alternating wave loads, top tension, and steady-state currents.

This invention belongs to the field of marine renewable energy development and utilization technology, and discloses an integrated device for a fixed monopile wind turbine-oscillating water column wave energy conversion device. The oscillating water column wave energy conversion device adopts a lattice structure and is placed inside the fixed monopile wind turbine foundation. The air chamber contains two symmetrical openings, with an annular moving plate sliding along an inner annular track at each opening. An air hole is located at the top of the air chamber, and a flow regulation system controls the opening degree of the air hole. An annular energy-concentrating plate sliding along a sliding ball bearing track is located outside the oscillating water column wave energy conversion device. The control system rotates the annular energy-concentrating plate to a suitable position for energy concentration; multiple measures are taken to improve the power generation efficiency of the oscillating water column wave energy conversion device. Under extreme sea conditions, the annular moving plate slides along the inner annular track until both symmetrical openings are fully open simultaneously, reducing pressure; the annular energy-concentrating plate moves upward along the rack track to a safe position, away from the sea surface; the lattice structure reduces wave load, thereby reducing the impact of waves on the device.

The application relates to a physical simulation experiment method of a caisson wharf under the combined action of earthquakes and waves, and relates to the technical field of coasts and oceans, and comprises the following steps: S1: experiment system construction and model preparation: a comprehensive experiment pool integrating a servo hydraulic vibration table and a wave making system is constructed; S2: load design: seismic motion input, wave load and loading working conditions are designed; S3: experiment loading and data acquisition: experiments are carried out according to the designed working conditions, and data are collected; S4: data processing and analysis, stability and damage mode of the caisson wharf are judged. The application provides a systematic, effective and repeatable physical simulation experiment method of a caisson wharf under the combined action of earthquakes and waves, and realizes real reproduction of the dynamic response of a caisson-ground system under complex environmental loads.

The present application relates to the technical field of marine suspension tunnel, in particular to a kind of marine suspension tunnel inspection robot active compliant track joint and control method, comprising: the both ends of magnetorheological track joint are connected track respectively, magnetorheological track joint includes shell, transmission, excitation coil, and magnetorheological fluid encapsulation area is arranged between transmission and shell;Excitation coil is wound outside magnetorheological fluid encapsulation area. After deformation of track joint under ocean wave load is measured using angle and displacement sensor, the form of magnetorheological fluid is controlled by changing the magnetic field generated by excitation coil, and the damping of track joint is adjusted. Compared with the traditional rigid track, the active compliant track joint can measure the pose information of track joint at any time, and actively adaptively adjust the damping of magnetorheological track joint according to the measured results, so that it can adapt to different intensity of ocean wave load, which helps to improve the adaptability and stability of track system of inspection robot under complex ocean wave load.

This invention relates to the field of energy storage control technology, and particularly to an adaptive smoothing method, system, and medium for fluctuating loads based on sliding window averaging. The method includes: acquiring the instantaneous load power on the load side and establishing a power balance relationship between the power supply, energy storage device, and load; continuously sampling the instantaneous load power at a preset sampling frequency to obtain a load power sampling sequence corresponding to the current moment; performing sliding window averaging on the load power sampling sequence within a sliding time window to obtain a target smoothed power corresponding to the current moment; determining the target charging / discharging power of the energy storage device at the current moment based on the power deviation between the instantaneous load power and the target smoothed power; and controlling the energy storage device to charge or discharge according to the target charging / discharging power. This invention effectively solves the technical problem that fixed-threshold energy storage control is difficult to achieve adaptive smoothing for loads with high-frequency, step-fluctuation characteristics.

The invention relates to the technical field of deep sea steel truss type net cage structures, in particular to a variable-diameter float type deep sea aquaculture net cage with a similar biological joint connecting structure. Each variable-diameter buoy is connected to the vertex of the polygonal net cage unit, the diameter of the lower portion of each variable-diameter buoy is larger than that of the upper portion of the variable-diameter buoy, the bottom end of the lower portion of each variable-diameter buoy is connected with the end of an anchor chain through a chain locker, and the other end of the anchor chain is connected with a gravity anchor. At least three polygonal net cage units are arranged in a circumferential mode, at least one floating cross beam is connected between every two adjacent polygonal net cage units, and the two ends of each floating cross beam are connected with the corresponding variable-diameter floating pontoons at the ends of the floating cross beam through the corresponding biological-like joints respectively. The design mode that the diameter of the variable-diameter buoy is small in the upper portion and large in the lower portion reduces the stress area of the waterline face of the component, the impact strength of wave loads on the structure is remarkably reduced, and the wave stability in the deep sea environment is improved.

This invention discloses a water-damped elastic cable with a check valve-type baffle structure and its installation method, belonging to the field of marine engineering and mooring technology. The water-damped elastic cable with a check valve-type baffle structure and its installation method include a support cylinder, which is formed by a sealed connection of an upper cover, a steel sleeve, and a lower cover to form the cylinder structure. The steel sleeve has upper inlet / outlet holes on its upper side and lower inlet / outlet holes on its lower side. Damping components include a tie rod, a spring, and a check valve-type baffle arranged along the axis of the steel sleeve. The check valve-type baffle is connected to the tie rod through the support structure, positioned between the upper and lower inlet / outlet holes, and its outer side is tightly attached to the steel sleeve cylinder. It generates significant water damping when wave loads increase, weakening the instantaneous peak value of mooring force and improving the impact resistance and safety of the floating system under severe sea conditions. The design of the check valve-type baffle and the rotatable push plate ensures the system's continuous response to periodic waves.

The application provides a simulation method and device for wave load centrifugal test of large-diameter thin-wall cylindrical structure, which comprises the following steps: preparing a scale model of large-diameter thin-wall cylindrical structure and fixing the scale model in a simulated foundation in a model box; the scale model divides the internal space of the model box into two mutually isolated spaces, which are respectively used as the sea side and the land side of the scale model; water is injected into the sea side and the land side of the scale model and the water levels of the two sides are consistent; the centrifuge is operated to make the model box in a supergravity environment; water is slowly injected into the land side of the scale model in the model box until the design height, then the water injection is stopped and the centrifuge is closed, and the total rotational moment and the total sliding force generated by the height difference of the water levels of the sea side and the land side are used to simulate the wave load and the corresponding load value generated by the static water level difference on the structure. The application adjusts the height difference of the water levels of the sea side and the land side of the structure to simulate the original wave load size and the torque effect of the wave load on the structure, and is especially suitable for curved surface structures with small thickness and low rigidity.

This application relates to the field of drilling technology, specifically to a shale pressure transmission experimental device and its usage method. The device includes a core holder, a high-pressure fluid supply module connected to the upstream end of the core holder, an upstream loading module, a confining pressure loading module connected to the confining pressure chamber of the core holder, a vacuum pumping module connected to the core holder, and a downstream receiving module connected to the downstream end of the core holder. Specifically, the upstream loading module includes a wave loading component, which is used to superimpose a time-varying wave pressure onto the downstream pressure provided by the high-pressure fluid supply module, and apply the superimposed wave pressure to the upstream end of the core sample. This more closely resembles the actual drilling process, including mud pump pulsation, pump start-up and shutdown, and circulating pressure fluctuations, thereby improving the simulation capability of the shale pressure transmission experiment for the real downhole environment and enabling more accurate acquisition of the pressure transmission response law under wave pressure conditions.