131 results about "Waterline" patented technology

Disclosed is a method of reducing drag on the hull of the vessel by creating a Coanda flow on the hull by jetting a fluid onto the hull or surface continuous with hull. The fluid is jetted onto the hull or surface continuous with the hull at a location above or below the waterline of the vessel. The fluid is jetted from within a habitat positioned at least partially below the waterline, the habitat being vented to atmosphere. The habitat has an open end below the waterline. The Coanda flow extends entrains air below the waterline and adjacent to the hull. An air cavity or sheet is created by the jetted fluid. A system for reducing drag is also disclosed.

The invention provides a ship active stabilization control method and system, and relates to the field of ships. The ship active stabilization control system comprises a stabilization execution mechanism which comprises an upper platform constructed according to a ship body of a ship and a lower platform constructed according to multiple sets of water pressing plate execution mechanisms, and the multiple sets of water pressing plate execution mechanisms are arranged at any positions below waterlines of the two sides of the ship correspondingly; each water pressing plate executing mechanism comprises a water pressing plate assembly and a driving cylinder connected with the water pressing plate assembly; the data acquisition unit is configured to acquire ship body attitude and motion state information and environment data of the ship; the stabilization controller is configured to calculate and generate correction torque according to the parallel robot kinematic mechanics mechanism model, the ship posture and motion state information and the environment data, and distribute the correction torque to an execution instruction corresponding to each driving cylinder; and the driving cylinders drive the corresponding water pressing plate assemblies to execute water pressing movement or return movement according to the execution instructions.

The invention relates to the technical field of ship draft measurement, and provides a ship draft dynamic detection method and system based on multi-modal fusion. The method comprises the following steps: acquiring a multi-modal ship image and / or video to obtain a ship visible light image and a ship near-infrared image; performing feature level fusion on the ship visible light image and the ship near-infrared image to obtain a fused image; performing key region detection on the fused image by using a pre-trained waterline detection model adopting YOLOv11, and marking and / or cutting a key waterline region in the fused image to obtain a target image; a SegFormer network added with an NAM attention mechanism is used for carrying out ship body and water body segmentation on the target image subjected to image correction, and ship body character features and waterline pixel features are obtained through edge detection; and constructing a visual ranging model containing character coordinates based on the hull character features, and inputting the waterline pixel features into the visual ranging model to obtain a ship draft detection result.

Embodiments include a buoyant wave energy converter. In an embodiment, the wave energy converter comprises an upper chamber having a first fluid reservoir and a first gas pocket, and a lower chamber having a second fluid reservoir and a second gas pocket. In an embodiment, an injection tube is between and fluidly coupled to the upper chamber and the lower chamber, where the injection tube is to impel a fluid from the second fluid reservoir into the first fluid reservoir when the upper chamber, the lower chamber and the injection tube oscillate about a waterline with the upper chamber adjacent to the waterline and the lower chamber submerged below the waterline and vertically beneath the upper chamber. An effluent tube is fluidly coupled to the upper chamber and the lower chamber, where the effluent tube is to return the fluid from the first fluid reservoir to the injection tube.

The invention belongs to the technical field of ship draft detection, and provides a ship draft real-time detection system which comprises the following steps: establishing a three-dimensional dynamic coordinate system, and updating a water surface reference surface in combination with real-time water level data; calculating water level variation of adjacent frames and compensating a point cloud Z axis; a pure ship body point cloud is separated in combination with a water surface datum plane, ship body reflectivity and a region growing algorithm; fitting a deck plane of the pure ship body point cloud, performing edge detection to extract ship board features, and correcting a side board feature surface; converting the pixel coordinates of the water surface reference surface and superposing the auxiliary lines; positioning a waterline, converting a bow / middle / tail waterline coordinate to a three-dimensional dynamic coordinate system, and calculating an initial draft; the deck Z-axis average coordinate is extracted, and the bow / middle / tail freeboard height is calculated in combination with the water surface datum plane coordinate; the theoretical draft is deduced in combination with the ship type depth, the theoretical draft is compared with the initial draft, the final draft is output, and the ship draft detection precision in the complex water level change environment is improved.

A hydrofoil arrangement for a boat includes a fastening device, first and second rigid elements, and a main hydrofoil. The fastening device is fastened on an outside of a hull below a waterline of the resting boat. The first rigid element pivots in a first pivot plane into and out of engagement with the hull, vertical and parallel to a forward direction. The second rigid element is connected to the first rigid element and extends at an angle to the first rigid element so that a second end of the second rigid element is at a vertical distance from the hull. The main hydrofoil is fastened to the second end of the second rigid element. The first rigid element can be pivoted downwards and backwards, and thereafter upwards and further backwards, to a position where its second end is arranged stern of the hull. A method is also described.

The invention relates to the field of ocean engineering equipment, and discloses a device and method for water surface close-range active auxiliary recovery of an unmanned autonomous vehicle, and the device comprises a blocking frame, a power assembly, an oscillation stopping hook module, a hoisting hook module, a suction device, a release device and a buoyancy material; the buoyancy material is fixed on the blocking frame and is used for providing static buoyancy; the power assembly is installed on the lower supporting structure of the blocking frame and located below the waterline. The power assembly is arranged below the blocking frame, so that the recovery device is endowed with independent water surface maneuvering capacity. Compared with a passive recovery mode which only depends on mother ship maneuvering or UUV autonomous homing, the device can actively approach the floating UUV by utilizing thrust and correct course deviation, and can realize axis alignment with the UUV even in a non-still water environment with stormy wave interference, so that the flexibility of recovery operation and the capture success rate are improved.

The invention relates to a ship (10) comprising a hull (110, 115) and at least one motorised propulsion means which rotates at least one propeller (180), the ship comprising at least one air duct (145, 150) comprising at least two openings including an air intake opening (140) positioned above the waterline (190) of the ship and an air outlet opening (160, 161) positioned below the waterline of the ship and configured to direct the air flow under the hull so as to reduce the friction of the hull on the water during navigation, the respective positions of each air outlet and of each propeller on the hull being selected so that the air flow(s) directed under the hull of the ship are axially offset with respect to each propeller so as not to hinder the operation of the propellers.

Novel ships A, B, C1 and C2 are provided. A, propeller propelling systems 3, 4 and 5 are arranged below waterlines on the two sides of a prow; b, arranging ice surface sliding plates on two sides of the ship body, and arranging a high-power electric fan above the waterline of the stern; c1, front, middle and rear sliding plates are arranged on the two sides of the ship body, and a plurality of sets of 50-meter trailer locking sliding plates are arranged on the high-speed rail. And C2, front, middle and rear sections of sliding plates are arranged on two sides of the ship body, a plurality of groups of electric high-speed rail wheels are arranged below the sliding plates, and the track gauge of each group of electric high-speed rail is 1.435 m. The method is comprehensively discussed in the specification of the specific development implementation scheme in the theoretical and technical fields.

The application discloses a kind of static water pressure loading methods of automobile roll-on / roll-off ship under broken compartment condition, at least including as follows: broken compartment water line is expressed using function segmentation under broken compartment condition at a transverse section;Broken compartment water line is cut into several segments in longitudinal direction under broken compartment condition;The method of finite element is segmented to apply static water pressure under broken compartment condition.The main problem of simulating the correct broken compartment water line under broken compartment condition is solved, so as to accurately check the structural strength of watertight deck;The operation of conventional application method is conservative, which causes the broken compartment pressure to be greater than the actual value, resulting in the unreasonable increase of structure, and the broken compartment water line simulation is accurate in the application, and the structure arrangement is reasonable.

The application discloses a bidirectional ice-breaking transport ship with open water performance, wherein the lower bow part of the bow of the ship is a small ball bow, the lower ice belt waterline is located on the upper half of the small ball bow, the outer surfaces of the upper bow part, the middle bow part and the lower bow part are streamlined, an ice discharge groove is arranged below the stern plate of the stern of the ship, the ice discharge groove is divided into two symmetrical halves by the centerline of the ship, the intersection line of the ice discharge groove and the ice-breaking stern is the stern post, the included angle between the stern post and the centerline of the ship is not greater than 30 DEG, a pod platform is arranged at the position close to the keel of the stern post, a triangular transition plate is arranged at the position close to the stern of the ship, the transition plate connects the end of the ice discharge groove and the ice-breaking stern with the stern plate, the distance between the two stern posts on the two sides of the ice discharge groove gradually increases from the stern of the ship to the keel direction, and the end of the stern post close to the transition plate is higher than the other end. The structure of the bidirectional ice-breaking transport ship has the open water performance under ballast water and the bow ice-breaking performance under the lower ice belt waterline, the bow of the ship has the ability of breaking thin ice, the stern of the ship has the ability of breaking medium heavy ice, and the bidirectional ice-breaking transport ship has important significance.

The invention belongs to the technical field of vibration reduction, and particularly relates to a marine expansion type watertight vibration reduction assembly and application of the marine expansion type watertight vibration reduction assembly to underwater propulsion equipment. The expansion type watertight vibration reduction assembly for the ship comprises a mounting base, an elastic piece, a fixing piece and a supporting piece. The elastic piece is connected with the fixing piece; one end of the mounting base is connected with the elastic piece, and the other end of the mounting base is used for being connected with a steering oar; the fixing piece comprises a base trunk and a gland flange. The marine expansion type watertight vibration reduction assembly has excellent sealing and vibration reduction effects, the structure of the marine expansion type watertight vibration reduction assembly is simple, the construction difficulty and the workload during installation can be greatly reduced, meanwhile, the size of the marine expansion type watertight vibration reduction assembly can adapt to different forms of steering oar propellers to be adjusted, and the application range of the marine expansion type watertight vibration reduction assembly is wide. And the method has relatively high flexibility and adaptability.

The invention belongs to the technical field of ships, and discloses a ship water gauge mounting method which comprises the following steps: S1, sequentially placing a plurality of water gauge segments on a plurality of pier bases; s2, pre-confirming the positions of a height mounting line and a rib position line and the plate thickness of a bottom plate outside a mounting rib position; s3, a waterline and a rib detection line are determined and marked, a first sample punching point is determined on the waterline, and a second sample punching point is determined on the rib detection line; s4, scribing the height mounting line and the rib position line in the step S2 by using a total station according to the step S3; and S5, confirming an upper mounting line and a lower mounting line of each water gauge character, and performing spot welding and full welding on the water gauge character. According to the ship water gauge character mounting method, the water gauge character can be mounted when the ship is transferred to an external field in a segmented, tire-free and placed mode, the water gauge character is mounted through the total station, the height mounting line, the rib position line, the water line, the rib detection line, the mounting line and the like, and the mounting precision is improved; therefore, the general assembly stage in the prior art is improved to the segmentation stage for installation of the water gauge character.

The application discloses a kind of non-perfect information condition under ship basic structure shape three-dimensional modeling method, including obtaining the three-dimensional modeling main scale basic data of ship platform;Establish the three-dimensional modeling coordinate system of ship basic structure shape, with ship overhead satellite remote sensing image as reference, construct initial main deck boundary line and superstructure contour model, with the deflection angle adjustment correction of initial model, with the deflection angle of correction as the shooting visual angle of satellite remote sensing image, restore to construct the two-dimensional normal overhead view of main deck boundary line and superstructure contour;Construct the control point coordinate of main deck boundary line, superstructure contour in the positive direction of Z axis, as the contour control point height above waterline, restore to construct the two-dimensional normal side view of ship basic structure shape;According to ship multi-view photograph, ship basic structure three-dimensional fitting is carried out, and ship platform basic structure three-dimensional shape modeling is completed.The application can realize the three-dimensional modeling of ship geometric shape under non-perfect information condition.

The invention relates to the technical field of ocean energy development and utilization, in particular to a power generation buoy capable of converting wave energy through cross-medium coupling, which comprises an annular floating body, an air turbine, a water turbine, a connecting pipe, a power generation module and a mooring system, the water turbine is fixedly installed in water below the annular floating body, the air turbine is connected with the water turbine through the connecting pipe, the air turbine is connected with the power generation module, the power generation module is fixed above the annular floating body, and the mooring system is moored below the waterline of the annular floating body. The outer rotor, the stator and the inner rotor in the power generation module are coaxially arranged, when the outer rotor and the inner rotor relatively rotate, an inner magnetic field and an outer magnetic field are electromagnetically coupled, and cross-medium coupling conversion wave energy power generation of the device is achieved; the air turbine and the water turbine are connected through the connecting pipe, a pipe shaft of the air turbine and an output shaft of the water turbine transmit energy to the power generation module, power aggregation is achieved, and the power generation efficiency is improved.

This invention discloses a monitoring method for a box-shaped keel on an ice-covered vessel, comprising the following steps: marking three spaced monitoring positions on the box-shaped keel, one of which is located at the heavy-load waterline at the bow; installing at least one monitoring component at each of the three monitoring positions; using a vibration sensor on the monitoring component to detect the vibration amplitude of the box-shaped keel and transmitting the detected vibration amplitude to a processor; and using a temperature sensor to detect the temperature of the box-shaped keel and transmitting the detected temperature to the processor; when the vibration amplitude detected by any vibration sensor exceeds a set amplitude, or when the temperature detected by any temperature sensor continuously rises to a set temperature within a set time period; reducing the vessel's speed from the current speed to a safe speed; and / or changing the vessel's course from the current course to a safe course. This method protects the scientific research equipment inside the box-shaped keel by monitoring its vibration amplitude and temperature changes.

The invention provides a device for offshore oil jacket large steel pile waterline marking construction, and relates to the technical field of offshore oil engineering equipment.The device comprises a frame and a sample plate lifting device arranged at the upper end of the frame, a construction platform is arranged on the side portion of the frame, and a climbing ladder is connected to the bottom of the construction platform; the frame comprises two cross beams symmetrically arranged at the bottom, stand columns are symmetrically arranged at the two ends of the cross beams, supporting pieces are arranged at the tops of the stand columns, a sample plate lifting device is arranged on the supporting pieces, and a walking steering mechanism is further arranged at the bottom of the frame. The walking steering mechanism is controlled by the control assembly to drive the frame to move, the sample plate can rotate along with a winding drum of the winding device through the sample plate lifting device to achieve lifting motion, the problem of waterline marking construction of the large steel pile of the offshore oil jacket is effectively solved, and the efficiency and precision of waterline marking construction are remarkably improved.

The application discloses a ship body and a deep V-shaped corner semi-small water plane catamaran, and belongs to the technical field of ships. The ship body comprises a first diving body, a second diving body, a first anti-rolling bilge keel, a second anti-rolling bilge keel, a first deadwood structure, a second deadwood structure and a V-shaped structure, the bottom longitudinal section shape of the first diving body and the second diving body is a V-shaped structure. The two included angle sides of the V-shaped structure are flat plate lines, the wave making resistance is small, and the ship body is beneficial to rapid navigation; the comprehensive reaction force of the first anti-rolling bilge keel and the second anti-rolling bilge keel will force the ship body to be righted and stand upright, the wind and wave resistance of the ship body is enhanced, and the sea keeping quality, the seaworthiness and the riding comfort of the ship are improved; a propeller tunnel is formed between the bottom of the stern of the ship body and the tail of the deadwood structure, the ship body has the soft beach landing ability during the ebb tide, and the propeller and the rudder blade are protected.

The application discloses a ship bow, which comprises a forward inclined part and a bulbous bow part; the bulbous bow part is connected to the lower part of the forward inclined part; the forward inclined part is located above the waterline, and the bulbous bow part is located below the waterline; the intersection line of the outer surface of the ship bow formed by the forward inclined part and the bulbous bow part and the ship centerline is a straight line segment and an arc line segment, the arc line segment is connected to the straight line segment, the straight line segment is located above the arc line segment, the straight line segment is distributed obliquely downward towards the stern, and the arc line segment extends towards the stern. The application solves the problem that the traditional line type cannot simultaneously consider the resistance performance under the two working conditions of ice area navigation and ice-free open water navigation, and effectively improves the comprehensive energy consumption level of the ship on the whole operation route.

A hydrofoil boat incorporates an elongated hull with front and rear portions and deployable hydrofoils for enhanced performance and maneuverability. A front canard hydrofoil is mounted on a front support system positioned at the hull's front portion, configured to be moved between a stowed position and an operating position. The rear portion of the elongated hull supports a pair of rear hydrofoils, each mounted on respective rear support systems. Each rear hydrofoil integrates a motor-driven propeller, with the rear support systems configured both to raise or lower the hydrofoils between stowed and operating positions and to rotate the propellers about vertical axes to facilitate directional steering. The arrangement allows selective deployment of the front and rear hydrofoils above or below the water line, enabling efficient lift, reduced drag, and improved control. The system further enables the retrieval of one or all the hydrofoils above the water line when not in use.

The invention relates to a monohull semi-submersible drone (1) comprising: a submerged hull (20), below a waterline plane (P2); a bow float mast (30), projecting from the submerged hull (20) and ending with an upper end (32) that is arranged above the waterline plane (P2) and that is arranged on the bow side (21) with respect to a front plane of the bow (P21) at one third of a bow-to-stern distance (d21); a stern float mast (40), projecting from the submerged hull (20), arranged between the bow float mast (30) and the stern (22) and comprising an upper end (42) arranged above the waterline plane (P2); and a marine propulsor (60T), arranged below the waterline plane (P2).

A safety device for an ammonia tank on board a ship with a hull, the safety device being characterized in that there are at least two separate pipelines, arranged for ammonia gas, each comprising an inlet connected to the ammonia tank and each comprising a first hull outlet arranged below a waterline on the hull, such that the hull outlets, in any loading condition of the ship, at least open below the waterline, into the surrounding seawater outside the hull, and wherein each pipeline further comprises at least one respective safety valve arranged in the vicinity of the inlets and wherein each safety valve is arranged to change from a closed to an open position at a defined overpressure in the ammonia tank, such that in a fully or partially open position of the safety valves, the ammonia gas will be led from the ammonia tank via the pipelines and out via the first hull outlets to the surrounding seawater around the hull and dissolved into aqueous ammonia, such that ammonia gas is not released into the atmosphere around the ship.

The present application relates to a kind of conjoined double moon pool operation system and its using method, the system is set in the middle of ship body, including blowout preventer group crane, blowout preventer group trolley, trolley converter, conjoined double moon pool, conjoined double moon pool is combined together by a small moon pool and a big moon pool, conjoined double moon pool both sides are longitudinally arranged trolley track, blowout preventer group trolley is placed in trolley track, and can be moved along the trolley track longitudinally, conjoined double moon pool tail transversely sets crane track, the blowout preventer group crane is placed in crane track, and can be moved along the crane track transversely.The present application can simultaneously meet the requirements of mud closed circulation drilling operation without marine riser and traditional marine riser drilling operation, realize the laying and recovery of underwater equipment and the suspension of mud return pipeline in two drilling operation modes, the setting of conjoined double moon pool has small waterline opening demand, improves the stability of ship body, and is beneficial to the overall arrangement of main deck.The whole system equipment is simple, and has strong compatibility, reduces investment cost.

The invention relates to a submerged machine, which can be coupled, for example, to the hull (0) of a watercraft, which comprises a body (1) in contact with the outside, below the waterline, connected to a rod (3) that can move through a chamber (4) to generate work, and wherein the body (1) comprises a second rod (5) connected to a damper (6) with a variable damping coefficient. The damper may be based on a magnetic hydraulic liquid.

The invention discloses a methanol fuel cabin arranged in a container cargo hold, which is matched with the cargo hold of a ship and comprises a methanol fuel cabin, the top boundary of the methanol fuel cabin is arranged below the minimum ballast water line of the ship, and an outer bottom plate of the ship is directly used as the bottom boundary; a methanol fuel cabin main body structure which is always surrounded by seawater or is lower than the sea surface is formed, when the methanol fuel cabin leaks, methanol fuel can be directly diffused to the seawater and dissolved in the seawater, the potential internal leakage accumulation risk is converted into controllable external diffusion so as to improve the safety, meanwhile, an isolation void cabin is not arranged at the bottom of the methanol fuel cabin, and the reliability of the methanol fuel cabin is improved. Structural compactness and efficient space utilization are achieved, the capacity of the methanol fuel cabin is increased, and the overall weight of a ship can be reduced.

The invention relates to the technical field of shipping monitoring, in particular to a ship draft detection method based on cell dichotomy, which comprises the following steps of: firstly, capturing a photo of a ship entering a ship through ship capturing systems on two sides of a channel, acquiring a ship name by means of a YOLOv8 target detection network, and inquiring a ship database to obtain identity information such as the depth of the ship; constructing a draught mark detection data set, and training a YOLOv8 network to detect and position a draught mark area; in a waterline detection and draught scale identification link, dividing a draught marking area feature map into cells according to columns, regarding waterline detection as a dichotomy task, and optimizing waterline position selection by utilizing a probability formula and a loss function; and finally, estimating the draft of the ship with the recognizable draft scale according to the waterline and the draft proportion. The invention aims to solve the problems that the traditional ship draft detection method is low in precision and poor in efficiency, and the existing automatic detection is insufficient in adaptability in a complex environment and is difficult to accurately detect the draft of various ships.

A method and apparatus for adding buoyancy to the transom of a boat by attaching buoyant material to the trim tabs, or to the planing surface of the trim tab, or constructing the trim tab itself of buoyant material. The buoyancy can be used to correct listing of a boat, or compensate for outboard engines that are unable to clear the water line when tilted up, or generally raise the stern of the boat while at rest. Buoyancy can be added to conventional trim tab plates or added to vertically extending interceptor blade type trim tabs. The invention also proposes a method by which trim tabs can be attached to the transom or the “step” or “pocket” above by a fixed or manually adjustable linkage, such as with a turnbuckle or jack screw or through-bolted perforated rods.

Motion compensated crane (10) for use on a sea-going vessel (1) having a hull (2) with a designed waterline, the crane comprising a rotatable superstructure (12), a main jib (14) mounted to the superstructure and connected at an inner end to the superstructure, the main jib having a distal end remote from the inner end, a main jib luffing assembly (15) adapted to set an angle of the main jib relative to the superstructure within a main jib working angle range, a rigid boom frame (20) pivotally connected to the distal end (14b) of the main jib, and a horizontal setting assembly (22) adapted to set the rigid boom frame in a levelled position at an angle within the main jib working angle range. The rigid boom frame is provided with parallel X-direction rails (25) which are horizontal in the levelled position of the rigid boom frame. The crane has a movable carrier (27) supported by the X-direction rails and moved by a motor-driven X-direction motion displacement actuator assembly.

The application discloses a kind of inland river ship freeboard measurement method based on monocular vision.First, the internal parameter calibration of monocular camera is carried out using checkerboard by Zhang Zhengyou calibration method, and the internal parameter of camera is obtained;The camera shoots the side view of the ship, and the Deeplabv3+ model is used to segment the part between the ship deck line and the waterline according to the side view of the ship;Further, the ship deck line and the waterline are detected to determine the position of the ship freeboard and calculate the pixel height of the ship freeboard;The conversion from pixel height to actual height is realized by the camera internal parameter obtained by calibration, and the real value of the ship freeboard is calculated.The application models the parameters of the camera itself, does not rely on vanishing point and vanishing line for ship freeboard measurement, and provides assistance for the safety navigation of inland river ships on water as the basis for ship overload detection.

A marine propulsion system includes wings with a hydrofoil shaped geometry arranged for mounting on opposite side sections of a vessel comprising at least one hull adjacent the transom. Each wing includes a first section extending downwards along the side of the hull and at least partially below the waterline in its operative position. Each wing includes a second section extending towards the central longitudinal axis of the hull in its operative position. The second section each wing is arranged to support at least one propulsor. The first section of each wing is mounted rotatable about a vertical axis.