34 results about "Ship hydrodynamics" patented technology

The invention relates to the ship dynamic positioning field, in particular to a method for identifying hydrodynamic coefficients of dynamic positioning ships based on the modeling of dynamic positioning ships by means of an adaptive genetic algorithm of a least square method. The method comprises the steps of determining a ship hydrodynamic coefficient; obtaining a longitudinal velocity u, a transverse velocity v and a rotation rate datum r of the sailing of an actual ship; obtaining a longitudinal velocity us, a transverse velocity vs and a rotation rate datum rs of a ship model; determining a target function J; determining a fitness function F; encoding the ship hydrodynamic coefficient; performing selective genetic operation on a population; performing crossover mutation genetic operation on the population, converting a binary code into a hydrodynamic coefficient estimation value; and setting maximum evolution algebra and performing multi-generation inheritance calculation. According to the method for identifying hydrodynamic coefficients of dynamic positioning ships, only the actual ship sailing velocity is needed to be recorded, and the model experiment is not needed, so that the design cost of a dynamic positioning system is saved.

The invention discloses a ship hydrodynamic performance evaluation method. The method comprises the following steps: selecting a parent ship; based on the ship type, constructing a series of sample points by adopting a Latin hypercube algorithm, constructing a series of sample ship types similar to the parent ship by adopting an arbitrary curved surface deformation algorithm, calculating six target values of all the sample ship types in waves by adopting a Reynolds average-fluid volume function method, and forming a sample data set; and then training a deep belief network model by adopting thesample data set, determining the accuracy of the constructed deep belief network model through accuracy verification, and finally evaluating a new ship type similar to the parent ship by the trainedmodel. The characteristics of ship sailing on the sea are comprehensively considered, the ship type with better performance in waves can be obtained, the applicability of ship type optimization is improved, the six hydrodynamic performance of the ship under the wave working condition can be effectively and rapidly calculated, and meanwhile the accuracy of data calculation can be guaranteed.

The invention discloses a ship model hydrodynamic performance testing device. The ship model hydrodynamic performance testing device comprises an installation platform, a fixed platform, a movement platform, a six-component balance, universal hinges and six electric cylinders; the upper ends and the lower ends of the six electric cylinders are connected with the fixed platform and the movement platform through the universal hinges; the six-component balance is installed in the center of the equilateral triangle formed by three fulcrums; the six-component balance is in rigid connection with the gravity of a testing ship model; the fixed platform is installed on a trailer beam through the installation platform; the six electric cylinders carry out telescopic movement to enable the movement platform to shift and rotate in different directions, and therefore swaying, surging, heaving, rolling, pitching and yawing movements of the ship model are simulated. The invention further provides a ship model hydrodynamic performance testing method with the ship model hydrodynamic performance testing device utilized. The ship model hydrodynamic performance testing device and method can accurately simulate the multi-degree-of-freedom movements of the ship model, various hydrodynamic parameters of the ship model can be measured under different testing states by combination with the six-component balance, and the hydrodynamic performance of the ship model is represented comprehensively.

The invention discloses a marine hydrodynamic force energy-saving combination type conduit hydrofoil, and belongs to the technical field of ship hydrodynamic force energy saving. The conduit hydrofoilcomprises a conduit consisting of a non-full-circle circular ring conduit and an incomplete elliptical ring conduit, wherein the incomplete elliptical ring conduit is connected with a ship body through a plurality of hydrofoils; one end of the non-full-circle circular ring conduit is connected with the ship body; the other end of the non-full-circle circular ring conduit is connected with one endof the incomplete elliptical ring conduit, or two ends of the non-full-circle circular ring conduit are independently connected with the ship body; the plurality of hydrofoils take the axial line ofa propeller as a center and are outwards distributed on the inner side and the outer side of the incomplete elliptical ring conduit in a radial pattern; the hydrofoils comprise conduit outer hydrofoils and conduit inner hydrofoils, wherein one end of each of the plurality of conduit outer hydrofoils is fixedly arranged on the outer side of the incomplete elliptical ring conduit; and two ends of the plurality of conduit inner hydrofoils are independently connected with the inner side of the incomplete elliptical ring conduit and the ship body. The marine hydrodynamic force energy-saving combination type conduit hydrofoil provided by the invention is used for improving ship propulsion efficiency and lowering main diesel engine propulsion power.

The invention provides an asymmetric measuring device for propeller pulsating pressure and belongs to the field of ship hydrodynamics experiments. The asymmetric measuring device can efficiently acquire maximum propeller pulsating pressure when measuring pulsating pressure in a vacuole water tunnel, can realize continuous and quick adjusting of measuring state and is convenient to mount. The technical scheme includes that the asymmetric measuring device which is liftable comprises a pulsating pressure measuring flat plate, pulsating pressure sensors, first guide rods, a water tunnel cover plate, a guide plate, a threaded rod, a threaded rod sleeve, a threaded rod seat and a rocking handle.

A device for measuring hydrodynamic force interference among multiple ships comprises two vertical first guide rails and a vertical second guide rail which are fixedly installed on a trailer. A dragging mechanism with a first ship model crosses the two first guide rails, and a dragging mechanism with a second ship model is arranged on the second guide rail. A transverse moving mechanism driven by a ball screw pair, a rotation moving mechanism driven by a worm gear and a lifting mechanism are arranged on the dragging mechanism of the first ship model and are used for driving the first ship model to conduct transverse movement, rotating movement and lifting movement. The dragging mechanism of the second ship model comprises a vertical moving mechanism and a lifting mechanism which are driven by the motor and are used for driving the second ship model to conduct vertical movement and lifting movement on the guide rail. The two dragging mechanisms are both provided with a sensor for measuring the hydrodynamic force performance. The device can achieve measurement of the hydrodynamic performance when multiple ships sail at different relative positions at identical speed or different speeds and is used for comprehensive study of hydrodynamic force interference among the multiple ships.

The invention provides a ship model heeling locking device. Another technical scheme of the invention is to provide a torque measuring method. A torque sensor is mounted on the rotating shaft, so thatthe problems of transverse inclination locking, transverse inclination torque measurement and the like in maneuverability four-degree-of-freedom modeling are solved. According to the device, the problem of convenient adjustment of the heeling angle is solved, the problem of measurement precision of the heeling moment is solved, and the device is a basis and a key point for high-precision measurement of the ship heeling moment, and is beneficial to improving the technical level of ship hydrodynamic tests. According to the device provided by the invention, the conception is ingenious, the structure is simple, the process performance is excellent, the operability is high, common parts are ingeniously combined to realize a ship heeling moment measurement function, a foundation for high-precision measurement of the ship heeling moment is laid, and the ship hydrodynamic test technology in China is improved.

The invention provides a ship hydrodynamic comprehensive energy-saving device and an installation method thereof. The ship hydrodynamic comprehensive energy-saving device is characterized in that it includes a propeller-rudder combined vortex-eliminating energy-saving device for dissipating energy of the vortex generated by the propeller, and the propeller-rudder The combined vortex-elimination and energy-saving device is fixedly installed at the tail of the propeller tail shaft and rotates with the rudder blade; it includes a combined energy-saving rectifying fin installed on the rudder blade for vortex elimination and rectification; it includes the double tail fins installed on the ship body, and Front rectifier fin structure located in front of the propeller. This comprehensive energy-saving device aims at the shortcomings of the existing ship energy-saving technology, and adopts corresponding technical solutions to improve it in order to achieve the purpose of energy saving, and after organically and comprehensively utilizing all energy-saving methods, it can achieve the final energy-saving effect .

The invention discloses a dead ship hydrodynamic power generation device and method, and the device comprises generators which are located at the two sides of a ship; a ship side road door opening andclosing device which is used for opening / closing a ship side road door; a generator telescoping mechanism which enables the generators to extend out of a cabin and retract into the cabin; a control circuit which is used for controlling forward rotation or reverse rotation of each motor of a main circuit to realize opening and closing of the road door and stretching of the generator. When the shipstops, the generators extend out of the cabin; and when the ship sails normally, the generators retracts into the cabin. Kinetic energy, generated by impact of water flow on the ship when the ship isparked, is used for pushing paddles on the generators to rotate, and the energy generated by water flowing is converted into electric energy; when the ship sails, the generators are retracted into the ship body, and as long as the relative speed between the ship and water exists, the electric energy can be provided for the ship, so that the generating capacity of the ship generator set can be reduced, the fuel consumption is reduced, the energy is saved, the emission is reduced, and the device is particularly suitable for inland ships.

The invention relates to the ship dynamic positioning field, in particular to a method for identifying hydrodynamic coefficients of dynamic positioning ships based on the modeling of dynamic positioning ships by means of an adaptive genetic algorithm of a least square method. The method comprises the steps of determining a ship hydrodynamic coefficient; obtaining a longitudinal velocity u, a transverse velocity v and a rotation rate datum r of the sailing of an actual ship; obtaining a longitudinal velocity us, a transverse velocity vs and a rotation rate datum rs of a ship model; determining a target function J; determining a fitness function F; encoding the ship hydrodynamic coefficient; performing selective genetic operation on a population; performing crossover mutation genetic operation on the population, converting a binary code into a hydrodynamic coefficient estimation value; and setting maximum evolution algebra and performing multi-generation inheritance calculation. According to the method for identifying hydrodynamic coefficients of dynamic positioning ships, only the actual ship sailing velocity is needed to be recorded, and the model experiment is not needed, so that the design cost of a dynamic positioning system is saved.

The invention discloses a ship body local curved surface optimization neural network modeling method and a ship body local curved surface optimization method, and relates to the field of ship design. In order to solve the problem that a large amount of initial sample data often need to be input in an existing agent model, the technical scheme provided by the invention is as follows: the method comprises the following steps: selecting a plurality of control points in a to-be-optimized ship body; changing the coordinates of the control points to obtain new control points, and taking the new control points as sample data corresponding to a plurality of ship types; hydrodynamic characteristic values are obtained to construct a BP neural network model; collecting a ship hydrodynamic characteristic value calculated by a BP neural network model and a difference value of ship hydrodynamic characteristic values corresponding to the group of control point coordinates obtained by a CFD technology as an error value; establishing a Kriging model, and taking an error value as output data; taking the sum of the error value and the output data as judgment data; and performing judgment, and if the judgment data meets a preset requirement, taking the judgment data as output data in combination with a BP neural network model and a Kriging model, thereby completing training. The method is suitable for being applied to ship body curved surface design work.

The invention discloses a catamaran model towing test device and belongs to the technical field of the ship hydrodynamic test device. The catamaran model towing test device is mainly composed of a fixed connection mechanism body, a sinkage drive system, a sheet body positioning mechanism, a signal measuring system and a data acquisition and recording system. The fixed connection body comprises a mount, a connection crossbeam and fastening screw rods. The sinkaage drive system comprises a sinkage leverage and a drive package. The sheet body positioning mechanism mainly comprises a sheet body positioning crossbeam and support arms. The signal measurement system includes a sinkage measurement sensing unit, a trim angle measurement sensing unit and a force sensing unit. To achieve the acquisition of each measurement sensor, the data acquisition and recording system records sinkage, flotation condition changes such as trim, and other parameters in the sailing process of the ship model. The device provided by the invention has the characteristics of reasonable design, simple structure, easy processing and manufacturing, low cost, easy operation and easy usage, high measurement precision, easy maintenance and wide range of applicable catamaran models.

The invention discloses a ship water power online forecast based ship shake reduction control system, and belongs to the technical field of ship and ocean engineering. Online self-adaption forecast ofship water power can be achieved according to a water power equation on the basis of the ship motion parameter real-time forecast and dynamic balancing idea and can be used as a basis of shake reduction control. A sensor module can measure the ship motion parameter, and a water power online estimation module and a fin angle allocation module can perform real-time self-adaption control on ship motion; and compared with the conventional shake reduction control method, the self-adaption and a water power estimation model are more perfect. The ship shake reduction system can be arranged on shipswith single-pair fins or dual-pair fins, can achieve horizontal shake reduction and vertical shake reduction of the ships with single-pair fins, can achieve horizontal shake reduction and vertical shake reduction, and vertical-horizontal shake reduction of the ships with dual-pair fins, can be widely used for shake reduction control of various water ships, and has good application prospect and good economic benefits in the field of ship shake reduction control.

The invention relates to a simulated experience system for ship hydrodynamic performance, comprising: a virtual simulation test platform, VR equipment and information processing equipment; the information processing equipment is used to receive ship-related information input by users for VR experience, and obtain the operation of the ship Parameters; the virtual simulation test platform is used to carry out collaborative simulation of the marine environment and ship motion model according to the operating parameters output by the information processing equipment, and obtain the ship's motion state parameters; VR equipment is used to carry the experiencer and receive the output of the virtual simulation test platform The parameters of the motion state adjust the carrying device to achieve an immersive experience of the ship's sailing. The system of this embodiment utilizes computer simulation technology to simulate the navigation attitude of ships in different ocean environments, and combines virtual reality technology to create a realistic ship navigation environment from a visual perspective, which is convenient for experiencers to experience.

The invention provides a ship model heeling locking device. Another technical scheme of the invention is to provide a torque measuring method. A torque sensor is mounted on the rotating shaft, so thatthe problems of transverse inclination locking, transverse inclination torque measurement and the like in maneuverability four-degree-of-freedom modeling are solved. According to the device, the problem of convenient adjustment of the heeling angle is solved, the problem of measurement precision of the heeling moment is solved, and the device is a basis and a key point for high-precision measurement of the ship heeling moment, and is beneficial to improving the technical level of ship hydrodynamic tests. According to the device provided by the invention, the conception is ingenious, the structure is simple, the process performance is excellent, the operability is high, common parts are ingeniously combined to realize a ship heeling moment measurement function, a foundation for high-precision measurement of the ship heeling moment is laid, and the ship hydrodynamic test technology in China is improved.

The present disclosure discloses a ship hydrodynamic prediction method and system based on the wet surface grid of the hull in waves, and reads the model value points of the ship; according to the model value points on each waterline, the cubic B-spline expression of the waterline is back-calculated ; Based on the cubic B-spline expression of the waterline, calculate the generalized section curve of the hull shape; determine the type of wave and the expression of the wave surface, and find the intersection point of the generalized section curve and the instantaneous wave surface according to the type of wave and the expression of the wave surface, Then, the wet surface mesh of the hull in waves is obtained; based on the wet surface mesh of the hull in waves, the hydrodynamic force on the ship in waves is predicted.

The invention discloses a resistance test system for a real sea large-scale ship model. The resistance test system includes a reference platform system, a ship model system and a dragging system; thereference platform system includes two benchmark platforms fixed on a seabed; a fixed pulley and a buoyancy material removal apparatus are mounted on the benchmark platform in the rear of the ship model; the ship model system includes a fixed pull point disposed at a gravity center of the ship model, and guide rods respectively disposed on decks of a ship bow and a ship stern; the dragging systemincludes a hoist, a steel wire rope, a counterweight and a convex frame; the hoist is mounted on the benchmark platform in the front of the ship model; a middle portion of the steel wire rope is hinged and fixed with the gravity center of the ship model; one end of the steel wire rope is connected to the hoist, and the other end of the steel wire rope is across the fixed pulley to be connected tothe counterweight; and a buoyancy material covers the steel wire rope soaked in seawater. The invention provides the test system capable of accurately measuring a sailing resistance and a moving posture of the real sea large-scale ship model. The invention relates to the field of ship hydrodynamic experiments.