88 results about "Irregular waves" patented technology

The invention discloses a device for simulating liquid sloshing generated under the random wave action. The device comprises a computer, a data collection module, an irregular wave generation module, a connecting rod, a base, a movement mechanism fixed to the base, a table board, a liquid cabin fixed to the table board, and a particle imaging velocimetry system. The particle imaging velocimetry system is right opposite to the front face of the liquid cabin, the irregular wave generation module is connected with the table board through the connecting rod, and the table board stably and transversely moves on the movement mechanism. The device further comprises a digital pressure sensor, a strain sensor, a wave height meter, a displacement sensor and an acceleration sensor. The digital pressure sensor and the strain sensor are embedded to the inner wall of the liquid cabin, the wave height meter is installed inside the liquid cabin, one end of the displacement sensor and the acceleration senor are installed on the table board, and the other end of the displacement sensor is fixed to the base. The device can accurately stimulate liquid sloshing generated under the random wave action in a small room.

The invention relates to a wave energy generating system. The system utilizes a floating body to receive the thrust of wave; a rope of which one end is tied on the floating body and of which the other end is wound on a rotating wheel pulls the rotating wheel to convert the obtained irregular wave thrust into rotating power; and at the stage of wave fall, the rotating wheel is driven by means of a spiral spring to reversely rotate so as to withdraw the rope. For a buoy lighthouse, the rotating wheel can be directly connected with a generator to rectify and store electricity; for large-scale wave energy generating, the floating bodies can be combined into an array plane, while the rotating wheel achieves energy transfer and collection through a ratchet and a hydraulic system; and finally, a generating set achieves electricity generation. The system is suitable for the waves of most waveforms, can absorb wave energy with high efficiency, has strong wave resistance and low manufacturing cost, and does not need to depend on a shore base to work.

The invention relates to the technical field of hydrodynamic experiment and search, and more specifically, relates to a nonlinear and multidirectional irregular wave and internal wave generating system and a control method therefor, wherein the system is used for generating high-precision nonlinear multidirectional irregular waves and internal waves in a pool. The system based on vertical multilayer and horizontal multi-plate control comprises a test pool (comprising a wave absorbing segment), a computer control drive system, a mechanical transmission system, a wave generating plate system (vertical multiple plates and horizontal multiple groups), and a wave height monitoring system. There are two fluid layers with different densities in the test pool during wave generating, or there is one fluid layer in the test pool otherwise. The system achieves the simulation of the nonlinear and multidirectional irregular waves and internal waves in the pool through the simultaneous control of a plurality of groups of horizontally arranged vertical multi-plate wave generating mechanisms and the different nonlinear vertical speed distribution of the two fluid layers or the single fluid layer, is higher in accuracy and precision, and meets the requirements of different tests.

The invention discloses a rocking plate type regular wave and an irregular wave maker. The irregular wave maker comprises a wave making plate, wherein the wave making plate is of a swinging structure, the bottom of the wave making plate is hinged with the bottom of the water tank and the top is connected with a connection rod, the connection position of the rotation rod and the turnplate is adjustably connected with the turnplate, the swing of the wave making plate is controlled by the connection position of the connection rod on the turnplate, the turnplate is connected with the motor for driving the turnplate, and the motor is connected with a variable-frequency governor for adjusting the frequency of the motor. The irregular wave maker has the advantages of being capable of generating regular and irregular wave, simple structure, convenient operation, and being applicable to various water tanks for generating wave.

Vehicle pneumatic tire includes a carcass having sidewalls and a tread rubber. A sidewall area is covered on an outside by a sidewall rubber strip. A moiré pattern is arranged on the sidewall rubber strip and is formed by a superimposition of at least two linear non-identical families of curves. A first family of curves of the at least two linear non-identical families of curves is formed by undulatory curves having regular wave form. A second family of curves of the at least two linear non-identical families of curves is formed by undulatory curves having irregular wave form. This abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.

The invention relates to a high pressure electric potential therapeutic apparatus which can output the asymmetrycomplex wave form. The high pressure electric potential therapeutic apparatus includes a power supply, a functional module, an output control, a high pressure output end, and an irregular wave form generating circuit connected in series between the power supply and the high pressure output end. The irregular wave form generating circuit includes a phase coupling booster transformer (T1) and a wave variable transformer (T2), and three groups of circuits connected in parallel between the secondary order of the wave variable transformer. The high pressure electric potential therapeutic apparatus of the invention, first is provided with a divider resistance and a high voltage diode in series by the high pressure end outputted by the high pressure, to realize the function of high pressure voltage division and attenuation; then, the elementary tandem connection wave variable transformer outputted by the high pressure realizes the addition of waveforms, thereby changing the high pressure outputting wave form. When the human body is cured, due to the abnormity of the electric potential, the physiological function of the human body can not generate the 'adopting' disease, to make the physiatrics used for a long time and maintain better therapeutic effect.

The invention provides a three-dimensional numerical simulation method for ship large-scale rolling motion, which comprises the following steps of reading a grid file to carry out ship hydrostatic calculation; calculating an influence coefficient matrix of boundary integral equation for Taylor expansion boundary element method; solving velocity potential of laminated modes and its spatial first and second derivatives and mj terms; carrying out the green's function in time domain and its spatial derivative solution; calculating a roll damping coefficient; carrying out the irregular wave decomposition, linear superposition into incident wave time calendar; carrying out the direct time-domain disturbance wave force calculation by taylor expansion boundary element method; calculating incidentwave force and hydrostatic recovery force; modeling a large-scale motion forecasting equation; using the fourth-order runge-kutta method to solve the motion equation step by step to evaluate the nonlinear motion of the ship in the top wave or oblique wave; and carrying out the numerical simulation and characteristic statistics of ship large amplitude motion in irregular waves. The method of the invention can predict the large amplitude motion of a container ship in regular waves and irregular waves, and can be used for numerical simulation and characteristic statistics of the large amplitude motion of a ship in irregular waves.

The invention discloses a machine vision-based ship hull six-degree-of-freedom measurement method. The method includes the following steps that: a RGB three-color marker is posted on a target ship, when the hull of the ship moves, the marker moves with the hull of the ship, two cameras are mounted at different positions, and the angles of the cameras are adjusted, so that the shooting range of the cameras can cover the movement range of the marker, and the cameras carry out image acquisition; images acquired by the cameras are preprocessed, and a RGB color occupancy volume-based segmentation algorithm is adopted to perform image segmentation operation, so that boundary parameters can be obtained, qualified feature points are made to be contained in a boundary range; and a binocular three-dimensional reconstruction method is adopted to obtain the three-dimensional coordinate values of the feature points; and the six degrees of freedom of the hull of the ship are decomposed, and the three-dimensional coordinates of P (x, y, z) at any one time point and the coordinates P'(x', y',z') of a next time point are known, so that a translation vector T(delta x, delta y, delta z) and a rotation vector R (alpha, beta, gamma) which are corresponding to the movement of the hull of the ship are obtained. With the machine vision-based ship hull six-degree-of-freedom measurement method of the invention adopted, real-time and non-contact measurement of six-degree-of-freedom movement of the hull of the ship in regular waves and irregular waves can be realized, and accuracy satisfies engineering requirements.

The invention relates to a drag performance testing method for a sailing ship in a periglacial region of an actual water area. The method includes 1, selecting a test sea area; 2, defining a channel with buoy balls and interception fishing nets and placing model ice in the channel; 3, placing a test ice navigation ship model in the channel and dragging the test ice navigation ship model to move forward in the channel through dragging a steel cable by a first auxiliary ship and a second auxiliary ship which are both disposed outside the channel; 4, measuring forces on the dragging steel cable,an included angle between the dragging steel cable and the first auxiliary ship and an included angle between the dragging steel cable and the second auxiliary ship, and calculating the resistance received by the test ice navigation ship model when advancing in the channel. According to the invention, limitations on size and navigation speed of ship models in a traditional dragging pool can be eliminated and an environment with interaction of real irregular waves and floating ice can be simulated, so that testing of drag performance of the sailing ship in the periglacial region can be realized.

The invention relates to a dual-rope type float body rope wheel sea wave power generation system, belonging to a wave energy generation system. In the invention, wave is pushed by a float body or an oscillating plate; one rope of which one end is tied thereon and the other end is wound on a rotating wheel to pull the rotating wheel to convert the obtained irregular wave push power into rotating power; during the wave fall-back period, another rope drives the rotating wheel to invert by the gravity of a heavy object to take back the rope; the rotating wheel realizes energy transmission and collection by a ratchet wheel mechanism and a hydraulic system so as to realize power generation via a generator. As for large-scale wave energy generation, the float body can form an array surface. The system can be adapted to waves with most waveforms, can efficiently absorb wave energy, has strong wind wave resistance and low cost and does not rely on shore-based operation.

The invention discloses a system for measuring ship draft and river water level based on special micro wave amplitude and a water gauge, belonging to the measurement field of the ship draft and the river water level and solving the technical problem that a measurement field video image comprising high-precision ship draft or river water level data can be displayed in real time by just using one miniature video picture. In the system, a technology of displaying the average height of irregular wave surfaces, a special micro technology of wave amplitude and ship water gauge maker or river water gauge, a video image monitoring system technology, an automatic tracking and shooting target technology of miniature camera equipment and the like are mainly adopted. The system has the advantages that visual, real, objective, just, clear and high-precision measurement data and measuring field live action which can be put on records is provided in real time by the video image and can be transmitted outside. The system has low cost, is simple and practical, is convenient to operate, carry and maintain and is energy-saving and environmentally-friendly, and the automatic measurement of the ship draft and the water levels of the river and the like is easily achieved.

The invention discloses a movable sand-adding and wave-making muddy water model test device with an automatic sand-removing function and a method. The movable sand-adding and wave-making muddy water model test device comprises a test water tank system, a wave-making system, a sand-adding and sand-removing system, a monitoring system and a control system. The wave-making system adopts the arrangement that a movable type wave-making machine is combined with a fixed type wave-making machine, and a vertical type energy dissipation box is combined with a slope type energy dissipation net, and simulation of a three-way regular wave and a multiway irregular wave can be achieved; the sand-adding and sand-removing system can achieve sand adding in a multi-section and movable mode, and can achieve the automatic sand-removing function; and the monitoring system and the control system can achieve closed-loop control of the device, so that the device achieves a simulation test where sand adding is synchronously matched with the waves according to a given sand-adding spatial and temporal process curve. According to the movable sand-adding and wave-making muddy water model test device with the automatic sand-removing function and the method, multi-direction and multi-waveform waves can be generated, further the stability of test sand-adding can be guaranteed, the functions of automatic, movable type and multi-direction wave-making and sand-adding are achieved, test water-sediment can be circularly utilized, the automatic sand-removing function is achieved, and the test cost is effectively reduced.

A full-wave analysis-based channel relevancy estimation method in a multi-input/multi-output system is used in the wireless communication technological field. The method includes the steps of: establishing a multi-input/multi-output broad channel module including a transmitting antenna, a receiving antenna, and a channel diffuser according to the transmitting environment of the multi-input/multi-output system; determining module parameters according to the actual environment from the angle of energy ratio; analyzing the module through the full-wave analysis method in combination with the basic theories of electromagnetic field so as to obtain the current distribution on the transmitting and receiving antennae; and defining the space relevancy coefficient of multi-input/multi/output channels according to the current distribution. Compared with the measuring and emulation results of the prior documents, the invention has the obvious effectiveness and excellence, provides a new solution to angle spectrum of irregular waves, and expands the study on the multi-input/multi-output system.

The invention discloses an unmanned aerial vehicle remote sensing-based wave and floating body movement forecasting system, and belongs to the technical field of ships and marine engineering. A shipborne unmanned aerial vehicle is used to obtain a ship's periphery distant wave flow field, and the information on the picture is analyzed and inversely deduced to obtain wave elevation information; thewave elevation information obtained by the unmanned aerial vehicle is processed, and an irregular wave surface is decomposed into superposition of a plurality of regular waves; the moments of all monochromatic waves reaching the ship are calculated according to wave propagation models, the proportion of the monochromatic waves, reaching the ship at every moment, in total monochromatic waves is calculated, and forecasting is carried out if the proportion is higher than a preset threshold; and all monochromatic waves generate wave surfaces according to a predetermined wave model, the wave surfaces are the forecast wave surfaces, and the movement of a floating body is calculated through RAO, a pulse response function and other fast algorithms. The system provides long-period accurate wave field information and self movement forecasting information for offshore structures and engineering work, and improves the working efficiency.

The present invention relates to a method for determining an elastic ship body load responding model in an irregular wave. The method comprises the following steps: truncating an integrating range of a ship body time domain delay function at a truncating frequency omega-hat of a high-frequency fluid damping coefficient B(omega) during the determination of the time domain delay function considering the ship body elastic effect and dividing the whole integrating range into two parts (0,omega-hat) and (omega-hat, infinity); dividing the range (0,omega-hat) into a limited number of small ranges, and performing integration in the range to obtain the damping coefficient B(omega) of the range; selecting an exponential decay function for simulating the damping coefficient B( omega) in the range (omega-hat, infinity) so as to obtain an infinite limit integral K<rk>(t) of the ship body time domain delay function. By virtue of the method, the influence on the truncating errors can be eliminated; and the defect of high requirement on hardware because of large calculation quantity of the method in the current method can be solved.

The invention provides a three-dimensional frequency domain numerical method for predicting wave drift load of a multi-floating body structure. The method comprises the following steps: Reading the mesh file, using the mesh information to carry on the ship hydrostatic calculation; calculating The influence coefficient matrix of simple Green's function Calculating The influence coefficient matrix of complex frequency domain Green's function. Taking The Taylor expansion boundary element method solve the unit radiation velocity potential, diffraction velocity potential and their spatial derivatives. solving Hydrodynamic Coefficients of Multiple Floating Body Structures; solving multi-floating body motion equation; solving The wave forces and wave drift loads of each unit for the whole multi-floating structure. According to the response RAO of floating body motion, anyalzing and calulating the floating body motion spectrum in irregular waves. The method of the invention can accurately predict hydrodynamic coefficients, motion RAO, wave forces, wave drift loads in a six-degree-of-freedom direction of each unit of a multi-floating body structure and results of floating body motion spectrum analysis.

The invention discloses a method of simulating the specific nonlinear wave sequence. The method includes preprocessing of the ocean measured wave sequence, accurate solution of the nonlinear dispersion relation and automatic generation of wave machine driving signals. According to the method, the observed ocean wave sequence can be automatically processed, the wave sequence obtained through oceanobservation is converted into the frequency, the corresponding amplitude and the phase information required for laboratory simulation waves according to the Froude number similarity criterion throughutilizing Fourier transform; the third-order nonlinear irregular wave interaction theory is utilized to rapidly calculate the dispersion relation of complex multi-frequency waves through the iterativecalculation method, generally, wave number accuracy of wave components can be calculated to one thousandth within ten iteration steps, and problems of low precision and long time for directly solvingthe nonlinear dispersion relation are solved.

The invention relates to a test device for simulating the washing and bearing coupled characteristic of an underwater pile foundation, which comprises a loading water tank, a horizontal limiting pulley, a loading bracket, a loading support, a rolling device and a wave water tank, wherein the loading water tank is connected with a surrounding enclosing rigid wall through the horizontal limiting pulley; the loading water tank can move up and down freely; and the whole vertical loading device can be fixed on the side wall of the wave water tank by a horizontal carrying bracket and by a bolt. Compared with the prior art, the device has the advantages that: various regular and irregular waves can be generated by a wave generator in the wave water tank; different vertical carrying forces can be simulated by changing the volume of water in the loading water tank in the vertical loading device; the loading can be adjusted by multiple stages, the coupling function of washing and axial loading is realized; and the lateral deformation, bending moment and soil pressure of all foundation piles of a single or group pile foundation under washing action can be well simulated.

The invention provides a wave detection system including a data processor, a data collector, a wave-height gauge, and a flow velocity instrument, one end of the wave-height gauge leads out of the liquid surface and the other end of the wave-height gauge is immersed into the fluid, The flow velocity instrument is arranged in the fluid, the wave-height gauge and the flow velocity instrument are arranged on the same section, the data collector acquires the signals fed back by the wave-height gauge, and the flow velocity instrument and transmits the signals to the data processor. The system is high in precision, wide in application, and flexible in instrument arrangement, can obtain the time domain process curve of the incident wave and the reflection wave, is suitable for regular wave and irregular wave, and effectively improves the accuracy of a wave model test.

The invention provides a three-dimensional numerical method for predicting wave resistance increase of low-speed fat large ships under bad sea conditions. Read the mesh file and carry out the hydrostatic calculation of the ship; Calculating the influence coefficient matrix involved in the boundary integral equation; Velocity Potential of Laminated Modes and Its Spatial First and Second Derivativesand Mj Terms; Green s Function in Time Domain and Its Spatial Derivative Solution; Roll damping coefficient calculation; The Velocity Potential at the Center Point of the Discrete Mesh of the SteppedFree Surface in Time Domain with the Free Surface Condition of Integral Scheme; Direct Time-Domain Disturbance Wave Force Calculation by Taylor Expansion Boundary Element Method; Calculation of Incident Wave Force and Hydrostatic Recovery Force; Modeling, solving equations of motion; Calculation of wave resistance; According to the motion response RAO and drag-increasing RAO, the large amplitudemotion and wave drag-increasing spectrum in irregular waves are analyzed and calculated. The method of the invention can predict the large amplitude motion RAO of a container ship in regular waves, the wave resistance RAO, and the analysis results of the large amplitude motion of the ship and the wave resistance spectrum in irregular waves.

The invention relates to a simulation and calculation method of the motion response of an underwater towing system under a high sea condition. The simulation and calculation method comprises the following steps of firstly, constructing a towing cable control equation; calculating a wave interference force and substituting the wave interference force into a towing cable control equation; then calculating a boundary condition and calculating an initial condition; finally, combining a towing cable control equation, the boundary condition calculation and the speed differential definition v = dx/dt to form a towing cable parameter calculation formula simulating the influence of the waves; inputting the operation parameters of the aircraft, the sea conditions and the parameters of the towing cable, and substituting the parameters into the calculation formula to obtain the simulation data and the simulation curve of the steady state cable type and the tension of the towing cable. The invention further provides a bridge lowering demolition construction method based on the demolition device. According to the method, an irregular wave data model which is extremely close to a real marine environment is constructed by utilizing a linear wave superposition method and a spectral analysis principle, and the reference significance is provided for the bait simulation effect of a dragging system and the navigation safety evaluation of an underwater vehicle.

The invention relates to a segmental generation method for waves in a towing tank, which belongs to the technical field of marine engineering experimental research. The method is characterized by comprising the following steps that: when an irregular wave simulation experiment is performed in the towing tank, the length of the tank is limited, wave train data of irregular waves are relatively long, and a wave train generated by a wave generator is not finished when a tow truck runs on a track around the whole experimental site at the speed set in the experiment, so that the wave train is divided into segments, when a segment of wave train data are completed, the tow truck is returned to a starting point and is operated again in the next segment of wave train until the wave generator generates the whole train wave; and the acquired experimental data are integrated to form a group of complete wave spectrum simulation experiment processes. The method has the advantages that: the characteristics of irregular wave spectrums can be fully and truly reflected when an effect of the irregular waves on moving ships is researched in the towing tank.

The invention provides a tracking and controlling system of maximum wave energy of wave energy, belongs to the field of new energy sources, and aims at solving the existing problem of water accumulation existing in the wave energy. The tracking and controlling system comprises a vibrating floater system, a controllable hydraulic system, a linear generator system and a mooring system, wherein the controllable hydraulic system is connected with the linear generator system, and the controllable hydraulic system and the linear generator system are both installed on the vibrating floater system; and the vibrating floater system is connected with the mooring system and enables the mooring system to be connected with the seabed. According to the tracking and controlling system, the linear generator system is adopted as a wave energy core collecting mechanism to directly transform mechanical energy of the up-and-down movement of waves into electric energy, so that the wave energy collecting efficiency is greatly improved; meanwhile, regarding changeable marine environment, irregular waves and other factors, a hydraulic system is designed to realize the maximum wave energy tracking and optimize a wave energy collecting system; and the tracking and controlling system has the advantages of strong environmental adaptability, high wave energy collection efficiency and the like, can realizeall-weather wave energy collection, and provides possibility for developing and efficiently utilizing the wave energy to generate power.