827results about "Vessel designing" patented technology

A method for verifying a control system (2) of a vessel (4), in which said control system (2) in its operative state receives sensor signals (7) from sensors (8) and command signals (9) from command input devices (10), and as a response provides control signals (13) to actuators (3) in order to maintain a desired position, velocity, course or other state of said vessel (4), characterized by the following steps:

• • during a time (t0), disconnecting the reception of real sensor signals (7a, 7b, 7c, . . . ) and replacing said real sensor signals by a test sequence (T0) of artificial measurements (7a′, 7b′, 7c′, . . . ) from a test signal source (41);
  • letting said control system (2) work based on the artificial sensor signals (7, 7′) to generate control signals (13′) to be recorded as a response (S0) to said first test sequence (T0) for said first time (t0) on a control signal logger (42) and storing response (S0) to the test sequence (T0) as the control system's (2) “signature” response (S0);

said method having the purpose of, at a later time (t1, t2, t3, . . . ), to use the test sequence (T0) input to the control system (2), and record a later response (S1, S2, S3, . . . ) and determining whether said later response similar to the signature response (S0) to verify that said control system (2) is unchanged, or not.

A Method and Apparatus for Wake Enlargement System have been disclosed. By using water pick ups that are mounted or deployable on a boat controlled filling of ballast tanks is possible without the use of pumps.

The ship motion simulator as one integral electromechanical apparatus consists of a six-freedom motion platform and large hydraulic cylinder connected serially, and the experiment cabin is fixed to the top of the six-freedom motion platform supported by the large hydraulic cylinder. The present invention can simulate the motion of ship in sea based on the requirement of experiment. The two-stages composite motion simulator of the present invention has great motion range for simulating ship motion state of ship in 1-6 scale of sea state. After one sea state scale, say 6 scale, in the range is given, the control system will give the motion locus of ship in the said sea state, 6 scale of sea state and the simulating platform will move in the given locus under the drive of the hydraulically driven simulating platform.

The invention discloses an underwater drag-reduction surface simulating scarfskin morphology of a puffer and a preparation method. The underwater drag-reduction surface simulating the scarfskin morphology of the puffer comprises a basement, hard drag reduction elements, and soft cover layers, wherein a plurality of hard drag reduction elements are distributed on the basement, the soft cover layers are filled among the hard drag reduction elements, and the hard drag reduction elements are tightly attached to the joint surface of the basement and the hard drag reduction elements. By adoption of the tapered or columnar hard drag reduction elements, the underwater drag-reduction surface simulating the scarfskin morphology of the puffer is different from the existing rib-shaped groove structure; and the soft layers are covered on the basement and form the rigid-flexible drag reduction surface which can form adaptive variations with differences of water velocity on the surface and fit with the scarfskin properties of the puffer better.

The invention discloses a horizontal plane motion mechanism for a towing tank test, which comprises a plane motion mechanism comprising a transverse oscillation frame 8, a transverse oscillation motion component 9, a yawing oscillation motion component 10, a transverse beam 6, a front connecting rod 5, a front connecting rod 11, adjusting rods 4 and 12, joints 3 and 13, force balances 2 and 14, and the like. The upper part of the horizontal plane motion mechanism is connected with a tank trailer 7 through the transverse oscillation frame 8, while the lower part is connected with a ship model 1 through the connecting rods 5 and 11 and force balances 2 and 14. By adopting a rolling guide rail, the transverse oscillation motion component has the characteristics of long service life, free maintenance for long-term work, high speed, low noise, high capacity of absorbing a mounting dimension error, and the like; and the transverse oscillation amplitude is over +/-1m, the ball screw precision is high and a transverse oscillation amplitude error is less than 0.2mm. Due to the adoption of a self-lubricating bearing and worm gear transmission, the yawing oscillation motion component has the advantages of wide rotation angle range, high torque, high self-locking property and high precision. A plurality of groups of connecting rod mounting holes are formed on the transverse beam and are suitable for different ship models. The connecting rod is provided with a linear bearing, and when the ship model is influenced by an external force to oscillate up and down, the connecting rod automatically adjusts the length, can remove a force in the vertical direction, and improves the accuracy of the maneuvering performance test. The control system is driven by a servo motor, a photoelectric encoder is used for sampling and feeding back, and a PLC programmable logic controller is used for controlling. The horizontal plane motion mechanism has the advantages of convenient control.

A ship model four-freedom-degree rotating arm test device comprises a rotatable rotating arm and a measuring mechanism between the rotating arm and a ship model. The measuring mechanism comprises a middle base fixedly connected with a rotating arm trailer, heaving rods penetrate through the middle base and can vertically slide, a linear displacement sensor is installed on a base plate at the lower ends of the heaving rods, a counterweight is connected to the upper end of the base plate through a steel wire rope, a four-component force measuring sensor is connected to the lower end of the base plate and fixedly connected with a longitudinal swing base, the longitudinal swing base is rotationally provided with a longitudinal swing shaft connected with a rotational potentiometer, the longitudinal swing shaft is fixedly connected with a middle frame, and the middle frame is connected with a heeling angle adjusting mechanism. The invention further provides a test method, wherein according to the method, water power in the longitudinal direction, water power in the transverse direction, water power during rolling and water power during yawing are measured through rotating arm tests under five test working conditions, and then the water power derivative is worked out through corresponding maneuvering motion equations. According to the ship model four-freedom-degree rotating arm test device and the test method, trim angle measurement and heaving displacement measurement of the ship model and water power measurement of the ship model in four motion directions can be achieved, and the handling quality of a ship in the four motion directions can be forecasted.

The invention relates to a device and method for measuring resistance and postures of a ship module. The device consists of an S-shaped resistance dynamometer, a trolling supporting rod, a guyed displacement measuring mechanism, a guide frame assembly and a band brake mechanism. When the device trolls a pool for measuring the resistance of the ship module, the device can also obtain a trim angle and the heaving postures of the head and the tail of the ship module, and resistance measuring under a stable speed condition of the ship module is realized by the interworking of the resistance dynamometer and the band brake mechanism; a wire is driven by the head and the tail of the ship module through utilizing the guyed displacement measuring mechanism, so that a corresponding voltage is outputted by a potentiometer, and a vertical displacement variation value of a bow and a vertical displacement variation value of a stern of the ship module are obtained through a straight-line relation; and a trim angle of the ship module, a heaving value of the ship module, the vertical displacement variation value of the bow and the vertical displacement variation value of the stern of the ship module are calculated; during trolling, the situation that the ship module moves freely in a vertical direction can be guaranteed by the guide frame mechanism, and the situations that a rolling cylinder is low in vertical sliding friction and free in vertical movement are guaranteed by utilizing a rolling shaft.

The invention belongs to the technical field of ship manufacturing, and specially relates to a method for a ship ice-breaking test in real water area. The method comprises the steps that (1), two water areas are formed in a planned test area on the river surface, wherein the length and the width of each water area are 50 m and 10 m correspondingly, and a laboratory containing test equipment and testers is built; (2), two cable towing mechanisms are fixed to one end of an ice tunnel correspondingly, a ship module is adjusted to a marked ballast waterline at the other end, and arrangement, connection and debugging of the test equipment are conducted; and (3), the cable towing mechanisms tow the ship module to move at a constant speed, and open-water resistance and the like of the ship module in still water are measured. The method is applied to resistance tests of the ship module in a level ice zone and a broken ice zone, a self-propulsion test of the ship module and the like, and can accurately measure parameters, such as total resistance, resistance components, sinkage, trim, propeller thrust and torque and main motor power, of the ship module when the ship module sails in the ice zones.

The invention discloses a ship energy saving method based on big data collection and analysis. The ship energy saving method comprises the steps that a database is established by collecting real-time data of main energy consumption equipment of a ship and real-time data of the navigation condition of the ship; the data of the energy consumption and the navigation condition of the ship are analyzed by a server, the energy consumption of the ship is evaluated, and the optimal trimming or rotating speed of the ship is recommended; the state of the ship is adjusted by ship handling personnel according to the optimal trimming or rotating speed; the data of the state and the energy consumption of the ship after adjustment are examined by virtue of a monitoring system and are compared with the data before adjustment, and if compared results are consistent, complete adjustment is fed back; if the compared results are inconsistent, error adjustment is fed back, and adjustment is performed again. According to the method, 2 to 3% of navigation fuel can be reduced.

The invention provides a towing device for a ship model test in an ice zone. The towing device comprises a fixing device used for being mounted on a ship model, a balance fixing device, a traction device and a towing platform, wherein the balance fixing device is used for fixing a force balance in the process of test; one end of the traction device is connected with the balance fixing device through a damping rod buffer and two tension springs, and the other end of the traction device is connected with a fixing mold frame of the towing platform through plastic-coating steel wires, the damping buffer and aluminum profiles; the fixing mold frame is fixed on a side axle of a laboratory trailer; besides, a guide rod and a fastening and lifting device control cabinet are mounted. The towing device disclosed by the invention is suitable for the towing test research for the ship model during the sailing of the ship model in the ice zone, and has stable course stability, so that hydrodynamic performance of the ship model during the sailing of the ship model in the ice zone can be more reliably measured, and the accuracy of the test is effectively improved.

A method, computer program and system for optimizing the usage of energy sources on ships is disclosed. The method involves creating a computer simulation model of a ship, optimized for fuel efficiency. Creating the computer simulation model involves selecting equations from a pool of equations, describing core components and structural features of a ship, and data from a pool of characteristic data for ship's core components and structures. Moreover, a method, computer program, and system for optimizing fuel efficiency of ships by the use of a computer simulation model is disclosed.

The invention discloses a flexible six-dof (degree-of-freedom) rope traction ship model pool test control method and system. Rope length control and ship model attitude control can be accurately realized through a ship model rope traction supporting mechanism. According to the method, rope length adjustment amount of each traction rope connected with a ship model is calculated by a main loop controller according to a preset target attitude angle and an attitude feedback signal, the calculated rope length adjustment amount of each traction rope is sent to a secondary loop controller, pulse adjustment amount of each traction rope connected with the ship model is calculated by the secondary loop controller according to the rope length adjustment amount of each traction rope and a pulse feedback signal of each servo motor, the calculated pulse adjustment amount of each traction rope is sent to a driver corresponding to each traction rope, the corresponding servo motors are driven by the drivers to rotate according to the pulse adjustment amount, a motion distance of a transmission mechanism is controlled through rotation of the servo motors, change of rope length of the traction ropes is controlled, and a present attitude of the ship model is adjusted through change of rope length of the traction ropes.

The invention discloses an experimental platform used for simulation and diagnosis of working conditions of a shipping power system and based on an intelligent engine room. The experimental platform is mainly composed of a shipping power system simulation experiment platform frame, a datum monitoring and failure diagnosis platform body (5) installed on the experiment platform frame and an oil liquid on-line monitoring module (6) connected with the datum monitoring and failure diagnosis platform body (5) through signal lines. The oil liquid on-line monitoring module (6) is connected into a pipeline lubrication system of the experimental platform in parallel. According to the experimental platform used for simulation and diagnosis of the working conditions of the shipping power system and based on the intelligent engine room, simulation of different working conditions of the shipping power system can be achieved, and torque monitoring, vibration monitoring and shaft power monitoring of the shipping power system and a shaft system as well as on-line monitoring of states of lubricating oil and hydraulic oil under different working conditions can be achieved; by combining an intelligent machine learning method, under supporting of a great number of monitoring data, failure diagnosis and state evaluation of the shipping power system under an intelligent engine room framework are achieved; and the experimental platform can be used as a target platform of an intelligent on-line monitoring and diagnosis system.

A method for constructing and installing a very large turret in a vessel without lifting the entire turret from a fabrication yard into the moonpool. According to a first alternative method, both the lower part and the upper part of the turret are constructed inside the moonpool while the vessel is in drydock. Such method obviates providing very large lifting cranes capable of lifting the entire turret including the upper part of the turret and the lower part into the moonpool. According to a second alternative embodiment, the turret has an upper part and a lower part and the lower part is constructed in the moonpool while the vessel is in drydock, like in the first alternative method. In the second embodiment, the lower part is supported by rods and jacks from the moonpool, and the vessel is floated out of drydock into the water and parked at dockside. The upper part of the turret is then lifted in place with a crane of moderate size and connected to the lower turret part with bearings installed between the upper part and the moonpool.

A computer-implemented method is disclosed to produce a model that predicts performance of a ship by creating an initial model based on relationships between factors related to the ship during operation and parameters representing primary dynamic input data that depend on the factors. Measurement results are obtained from sensors during the operation of the ship for producing a set of new dynamic input data to be used in the model. If a difference between a simulation result and an actual operation exceeds defined threshold criteria, the model is improved by repeatedly producing new sets of dynamic input data until defined quality criteria are met.

Systems and processes for closing openings in marine vessel hulls are provided. The systems and processes facilitate repairs and maintenance of marine vessels by closing openings in the marine vessel hulls to permit dry access to compartments in communication with the openings. The processes and systems incorporate a cover constructed from a lightweight material such as fiberglass, a viscoelastic material such as polyethylene or polyurethane, and blends thereof. The cover is guided in place to effectuate closure of the opening by a track device that receives at least two of the peripheral edges of the cover and directs the cover to the proper position to close the hull opening. The cover may be lowered into place by use of a hoisting device such as a davit.

The invention relates to a process for hoisting a whole assembly section of an upper-layer building living zone of a ship. The hoisting process comprises the steps that the living assembly section is hoisted and assembled into a whole in a segmented mode, the whole assembly section of the living zone is then hoisted through a hoisting tool, and the peripheral wall of the whole assembly section of the living zone coincide with deck positioning piles when the whole assembly section of the living zone is 0.8-1.2 m away from the surface of a deck, the whole assembly section of the living zone is slowly put down, and finally tiny adjustment is performed through pull members on the periphery of the whole assembly section of the living zone for alignment and positioning. The process for hoisting the whole assembly section of the upper-layer construction living zone of the ship has the advantages that the whole assembly section of the living zone is firstly assembled in the segmented mode and then is wholly hoisted to the deck, accordingly the working efficiency of hoisting can be improved, a ship construction period can be shortened, the deformation of an upper-layer building in the hoisting process is prevented by adopting various structural strengthening measures, and the actual deformation amount of the upper-layer building of the ship can be minimum.

The invention discloses an ice breaking resistance forecasting method of an ice-region ship based on an experiment of an ice water pool. The ice breaking resistance forecasting method comprises basic principles of the experiment, an experiment method and an experiment data processing method. The basic principles of the experiment mainly adopts a manner of classifying main resistance based on the breaking manner of ice and the movement manner of crushed ice in the ice breaking process of the ice-region ship; the experiment method mainly explains the ice breaking process of a real ship simulated in an ice water pool laboratory; and the experiment data processing method mainly introduces how to perform the resistance forecasting of the real ship through data obtained by the experiment. Through the adoption of the ice breaking resistance forecasting method of the ice-region ship based on the experiment of the ice water pool disclosed by the invention, reference can be provided for the real ship resistance forecasting in the developing process of the ice-region ship.

A submersible vessel comprising:

• • an elongated hull;
  • at least one propeller mounted on a forward end of said hull and adapted to move said hull through water;
  • said at least one propeller being of a size and configuration such that when it is rotated at an appropriate speed, it generates supercavitated water flowing from said at least one propeller and thence along an outer surface of said hull so as to diminish friction on the outer surface of said hull and facilitate high underwater speeds.

The invention belongs to the technical field of ship model experimental equipment, and relates to a multifunctional ship model experimental measurement device. A bow and a midship of a ship model are respectively provided with a cabin. A frame is installed in the cabin of the bow of the ship model. A liquid tank is installed in the cabin of the midship of the ship model, and a deck is placed on the upper portion of the liquid tank. A standard block for an experiment is placed on the frame or the deck, resistance towing brackets are symmetrically arranged on the two sides of the midship of the ship model, a power supply and a tilt angle sensor are sequentially installed on the deck of the bow of the ship model, the tilt angle sensor is in electrical information communication with the power supply and a signal emitter, the signal emitter is installed on the deck of a stem of the ship model, a signal receiver is in electrical information connection with a handheld displayer and a computer, and the signal receiver, the handheld displayer and the computer jointly form a signal receiving device. The multifunctional ship model experimental measurement device is simple in structure and convenient to operate, measured data are accurate, various ship model experiments can be conducted, wireless measurement is combined with wired measurement, and the requirement for measuring different environments can be met.

The invention discloses a mounting method for an energy-saving conduit of an ultra large crude carrier in a block stage. The mounting method for the energy-saving conduit of the ultra large crude carrier in the block stage comprises a conduit advanced total assembly stage, a shafting pre-aligning stage, an energy-saving conduit locating and mounting stage and an energy-saving conduit and propellershaft welding stage; the conduit advanced total assembly stage comprises the following steps of making a special jig frame, scribing a line on the jig frame, mounting a right half side conduit, mounting a central longitudinal bracket, mounting a left half side conduit, arranging temporary reinforcements at the front end and an opening of the energy-saving conduit; carrying out positioned weldingto weld butt joints of inner shell plates, the central longitudinal bracket and a cover plate, arranging a temporary reinforcement at the rear end of the energy-saving conduit, and cutting off allowance of a fin; and in the shafting pre-aligning stage, a center line of shafting is transferred to a propeller shaft external plate. According to the mounting method for the energy-saving conduit of theultra large crude carrier in the block stage, the energy-saving conduit mounting step is advanced to create a condition for staged boring of a propeller shaft hole; and therefore, the shipbuilding efficiency is effectively enhanced, and the shipbuilding cost is saved.

The invention provides an installation method of a ship stern shaft. A supporting trolley is arranged at the tail end of the stern shaft, a guide trolley is arranged at the front end of the stern shaft, and the stern shaft is driven by the two trolleys to be installed on stern shaft frames on a ship one by one. By the adoption of the installation method of the ship stern shaft, the stern shaft can be installed conveniently and quickly, the use requirement for a chain hoist is greatly lowered, no heavy duty platform lorry is needed for assistance, the installation difficulty can be lowered, and the working efficiency is greatly improved as well.

An ultrasonic surveying method includes a network of transceivers adjacent the item to be surveyed to establish a reference plane and locating an array of pingers on the object to be surveyed to establish a survey plane, establishing by ranging from the pingers to the network the location of the survey plane, detecting relative motion between the network and the pingers and correcting survey measurements for the detected motion.

The invention provides a large-scale anchor chock and anchor mouth lofting design method. According to the lofting design method, a three-dimensional space lofting principle is used for completing theoretical model construction, and a specific three-dimensional projection lofting method is adopted to complete the lofting of an intersecting line of the anchor chock and a ship hull plate and a contour line of an anchor chock upper basal plane; and at the same time, a tangency included angle of the anchor mouth and the anchor chock and a hawse pipe is obtained, a contour line of the anchor mouthis drawn, a three-dimensional shaded surface of the anchor chock and anchor mouth is constructed, and three-dimensional modeling work of the hawse pipe, the anchor chock and the anchor mouth is finished. The large-scale anchor chock and the anchor mouth lofting design method solves the problem that the lofting of anchor chocks and anchor mouths of various types of ships is low in efficiency and poor in precision, precision data of feeding, machining, and assembly locating are provided for a site, the work of field proofing and adjustment is simplified, and the installation efficiency and precision of the anchor chocks and the anchor mouths are enhanced.

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 deepwater floating type multifunctional dry tree semi-submerged platform and a marine installation method of the semi-submerged platform. The semi-submerged platform comprises a main hull, an upper component block and a group mooring system. The main hull comprises an upper floating body, a lower floating body and a telescopic connecting vertical column, wherein a ballast tank and a functional cabin are arranged in the upper floating body, a channel allowing a tension type vertical pipe, a production vertical pipe and/or a drilling vertical pipe to pass through conveniently is formed in the middle of the lower floating body, and the upper floating body and the lower floating body are connected through the telescopic connecting vertical column. The main hull can be switched between a folded state and an unfolded state through the telescopic connecting vertical column, and the lower floating body is located next to the lower portion of the upper floating body in the folded state, and the lower floating body keeps a certain distance from the upper floating body in the unfolded state. The upper component block is installed on the upper portion of the upper floating body and comprises upper facilities. The group mooring system comprises multiple mooring ropes which are connected with the upper floating body. The deepwater floating type multifunctional drytree semi-submerged platform is simple in technique, low in installation cost and capable of being widely applied to oil-gas field development under a deepwater marine environment condition.

System for assisting the driving of a ship, configured to estimate the structural loads of the ship due to the direct wave excitation, and structural loads of the ship due to the whipping effect caused by the wave slamming. The system includes at least one reference sensor (40') adapted to provide an indication of a motion or stress magnitude at a predetermined point of the ship structure, and is further configured to calculate an estimate of said magnitude at the predetermined point in the ship structure, compare said indication of magnitude with the estimate of said magnitude so as to determine an offset value, and correct the estimates of the structural loads and/or the estimate of said magnitude on the basis of said offset value.

A method and arrangement for reducing the weight and optimizing the longitudinal strength of a water-craft (1), which is especially suitable for transportation of liquefied natural gas (LNG) or other corresponding mediums and comprises a hull (2), which has a deck (3) extending over at least the main part of the water-craft (1) and a number of substantially spherical cargo tanks (4) arranged successively in the longitudinal direction (A) of the water-craft (1) and a deckhouse (5), which extend substantially above the said deck (3). The hull (2) of the water-craft (1) is provided with a continuous protective casing structure (6) known as such and which is arranged on top of the cargo tanks (4). The said deck (3) of the water-craft is arranged on the hull (2) so that the proportion of its height measured from the bottom of the water-craft to the height of the uppermost continuous portion of the protective casing structure (6) on top of the cargo tanks (4) is at most 0.55, preferably at most 0.5. In addition said protective casing structure (6) is fixed to said deck (3) and/or other structures (7) supported to the hull (2) and is dimensioned together with the other parts of the hull (2) so that together they constitute an essential part of the overall strength of the water-craft.

Structural damage repair elements including inserts and a structural damage repair kit is provided. The structural damage repair elements typically include two or more layers of materials having an adhesive therebetween that are subsequently compressed together. The structural damage repair kit includes a chemical molding agent, an optional jig, one or more structural damage repair elements and a sealant. Both hollow and solid elongated objects, as well as relatively flat, curved objects may be repaired with the kit. The structural damage repair elements include rods, wafers, and/or adhesive saturated inserts.

The invention discloses a method for manufacturing a duplex stainless steel middle assembly plate frame of a chemical tanker. The method comprises the following steps: S1, the fabrication of a specialtire frame for duplex stainless steel spliced plates, S2, the splicing of the duplex stainless steel plates; S3, the fabrication of the duplex stainless steel middle assembly tire frame; and S4, thefabrication of the duplex stainless steel middle assembly. The method uses a special duplex stainless steel spliced plate tire frame, ensures the precision of the spliced plates, reduces the consumption of the tire frame material, and reduces the mechanical damage to the surface of the duplex stainless steel plate. In the process of splicing the duplex stainless steel plate, a forced weight restrained deformation method is provided so as to reduce the welding deformation during the splicing process. The method utilizes a dummy compartment to control the assembly precision of flat-bulb steel, and provides a flat-bulb steel and duplex stainless steel welding sequence method so as to avoid a large workload in a subsequent precision correction process and shorten a product construction period.