56results about "Watercraft hull design" patented technology

To provide a friction reduction device capable of increasing a friction resistance reduction effect and reducing a pressure loss.SOLUTION: A friction reduction device of a navigation body navigating in contact with water has multiple cavity grooves open to the surface of the navigation body, an air supply pipe connected to each cavity groove and supplying air to the cavity grooves, and a header part connected to the air supply pipe and supplying air to the air supply pipe. The multiple cavity grooves are arranged in a line along the travelling direction of the navigation body. The longitudinal direction of the cavity groove is the direction orthogonal to the travelling direction of the navigation body. On the upstream surface in the travelling direction of the navigation body, the cavity groove has a convex curved surface in the traveling direction of the navigation body, and the air flows along the curved part from the opening and is injected toward the downstream of the traveling direction of the navigation body.SELECTED DRAWING: Figure 2

The application discloses a polymer drag-reducing agent injection type hydrofoil, and belongs to the technical field of polymer drag-reducing agents of underwater vehicles. The application solves the problem that there is no drag-reducing agent injection structure capable of stably outputting polymer drag-reducing agents and capable of adhering to the surface of a drag-reducing part of an underwater vehicle. One end of a steady flow cavity is communicated with a solution storage box in the underwater vehicle through a discharge channel, a cover plate is parallel and slidingly inserted on a main body of the hydrofoil, the lower surface of the cover plate is adhered to the upper surfaces of a plurality of fairing plates, and the outer surface of one end of the cover plate and the inner wall surface of one end of the steady flow cavity form an injection channel. The steady flow cavity has a steady flow effect on the solution, so that the stable output of the polymer solution is realized; the flow state of the polymer solution is adjusted through the fairing plates, so that the polymer solution flows stably; the polymer solution flows out to the surface of the hydrofoil through the injection channel, the frictional resistance generated during sailing is reduced, and the sailing performance of the underwater vehicle is improved.

The application belongs to the technical field of ship manufacturing, and discloses a marine underwater observation device and a ship. The device comprises a support structure, a fairing, an underwater camera and a camera collecting end. The support structure is provided with the fairing on the lower side, and the underwater camera is arranged in the fairing. The underwater camera is electrically connected with the camera collecting end. The support structure and the fairing are arc-shaped or conical near the bow side. The device solves the problem that personnel cannot directly observe the working state of the propeller in the prior art, so that data cannot be collected.

The application discloses a novel anti-cavitation surface structure and a preparation method thereof. The anti-cavitation surface structure can change the wetting degree of a material surface, reduce gas nuclei near a liquid-solid contact surface, inhibit cavitation and cavitation erosion processes, and also reduce the damage of micro-jets to the material in the cavitation erosion process. The anti-cavitation surface structure layer is composed of a surface construction layer and a substrate. The working mechanism is as follows: firstly, the construction can change the wetting degree of the material surface, so that the gas nuclei near the liquid-solid contact surface are reduced, thereby slowing down the cavitation and cavitation erosion processes; secondly, the incident kinetic energy of the micro-jets in the effective construction area is consumed in the form of friction, thereby reducing the damage of the micro-jets to the material substrate. The application can effectively slow down the cavitation erosion process, weaken the influence of the micro-jets on the material substrate in the cavitation erosion process, and effectively resist the damage of the cavitation erosion to the material surface.

This utility model discloses an easily adjustable guide vane fixing base for marine air lubrication. The key technical points are: belonging to the field of marine equipment repair and construction, it includes a mounting frame body, with an air release device installed at the upper end of the mounting frame body; a support is movably connected to the lower part of the mounting frame body; and a symmetrically distributed limiting frame is fixedly connected to the upper end of the support. By setting guide blocks and top rods, the guide blocks move to drive the connected top rods, which in turn drive the top frame to adjust its position. This allows for precise control of the guide vane's height during installation, enabling it to quickly align with the designed installation position and improving positioning accuracy. The adjustable height function allows for fine-tuning of the guide vane's posture and position during initial installation or trial assembly, avoiding rework caused by positional deviations before welding or bolt fixing. This improves the convenience of assembling the guide vane body using this marine air lubrication guide vane fixing base.

The application belongs to the technical field of law enforcement boats, and particularly relates to a steel-glass mixed high-speed law enforcement boat, which comprises a high-speed law enforcement boat body, the upper surface of the bow deck of the high-speed law enforcement boat body is fixedly connected with a hollow leveling block, the upper surface of the hollow leveling block is fixedly connected with an air extraction pump and a protective cover through connecting bolts, the air outlet end of the air extraction pump is fixedly communicated with the upper surface of the hollow leveling block, the outer wall of the protective cover is provided with a threaded hole, and the hole wall of the threaded hole is sealingly connected with an air inlet filtering mechanism. The steel-glass mixed high-speed law enforcement boat has the function of adjusting the buoyancy, thereby the water depth can be adjusted, the running resistance of the high-speed law enforcement boat is reduced as much as possible, the high-speed law enforcement boat has the functions of overload early warning and breaking thin ice layer, the high-speed running performance and protection capability of the high-speed law enforcement boat can be effectively improved, and the safety and reliability of the high-speed law enforcement boat running can be improved.

The support structure (4) of the floating offshore platform includes a transverse member (8) formed of one or more pipes (10) with tanks (12) partitioned inside the transverse member (8), and at least one bolted flange connection (16) connecting the end of one pipe (10) of the transverse member (8) to another structural element (6) of the support structure (4), wherein each bolted flange connection (16) includes a first flange (20) and a second flange (22) together bolted by bolts (24), and the at least one bolted flange connection (16) is sealed by a sealing assembly (32) which includes at least one sealing member (34) configured to seal the bolted flange connection (16).

The present disclosure provides an inflatable white water kayak (hereinafter referred to as the kayak) with a narrow hull and a U-shaped bottom, which is a high-pressure narrow-type bottom weighted boat, and belongs to the field of portable packrafts. The high-pressure narrow-type bottom weighted boat includes an inflatable and deflatable tubular body, where the tubular body includes a bow, a middle segment, and a stem; the bow, the middle segment and the stern are connected sequentially; the middle segment includes a bottom plate and two side tubes; the two side tubes are symmetrically disposed at two sides of the bottom plate; the bottom plate and the two side tubes define a central seating area; the side tube includes at least two sidewall subtube portions; for the single side tube, the sidewall subtube portions are connected sequentially along a vertical direction to form a whole; a section of the side tube along a direction perpendicular to a central axial direction of the side tube is elliptical or quasi-elliptical; the side tube is combined with the bottom plate; and a section of the middle segment along the vertical direction is quasi-U-shaped.

The present invention relates to a ship flow control system having a pre-swirl flow control fin, wherein a swirl flow is generated opposite to the propeller rotation direction such that the ship propulsion efficiency is improved without increasing cavitation and hull fluctuation pressure occurring in the upper portion of the starboard of the ship. The ship flow control system comprises a flow control fin installed in a curved portion of the stern of the port side of the ship positioned in front of the propeller so as to be inclined toward the lower side with respect to the basic flow direction of seawater, thereby inducing the seawater flow direction to face the lower side of the propeller. By generating a swirl flow in the counterclockwise direction, which is opposite to the propeller rotation direction, such that the ship propulsion efficiency is improved without increasing cavitation and hull fluctuation pressure occurring in the upper portion of the starboard of the ship.

The utility model discloses a kind of ball nose first segment in-dock centering tool, including centering plugboard subassembly and centering clamping plate subassembly, the centering plugboard subassembly is fixed on tool subsidence platform, the tool subsidence platform is fixed on ball nose first segment, the centering clamping plate subassembly is fixed on dock deck. Its technical points are: centering tool is divided into two parts, upper part is centering plugboard subassembly, lower part is centering clamping plate subassembly, centering plugboard subassembly can be installed in advance on segment, centering clamping plate subassembly is installed on dock deck after ship enters dock, segment is hoisted to the above of centering clamping plate subassembly tool, the amount of sway of segment is reduced using chain block, after centering plugboard subassembly on segment falls into corresponding centering clamping plate subassembly, accurate centering can be realized, after starting translation trolley so that each trolley is uniformly stressed, hook can be loosened, tool overall design is small and practical, can be installed by single person, accurate and fast segment positioning under floating state is realized.

This invention provides a ship drag reduction optimization method based on the EEXI standard, belonging to the field of ship energy efficiency optimization technology. The method involves arranging multiple independently driven adaptive suction drag reduction devices in an array on the ship's hull. The impellers are driven by the impact of the ship's navigating water flow to generate rotational power, requiring no external energy source. A centrifugal governor automatically adjusts the throttle valve opening according to the ship's speed, adaptively matching the suction flow rate with the speed, maintaining optimal boundary layer suction intensity across the entire speed range, effectively thinning the boundary layer and reducing frictional resistance. The device adopts a purely mechanical structure, equipped with a friction-type overload clutch, and features anti-clogging, anti-marine organism attachment, and triple sealing functions. It is modularly installed for convenience, has a short retrofit cycle, low cost, and high reliability. This invention can significantly reduce ship fuel consumption and carbon emissions, achieving a net energy saving rate of 10%–15%, effectively improving the EEXI compliance rate of older ships, and is suitable for energy-saving retrofits and new construction designs of various displacement-type ships.

The invention relates to a vessel (1) comprising: - a hull (2), having a forward direction (X) in a horizontal plane (HP) with an aft portion (5), having a buttock angle (β); and - an aft foil (6), suitable for generating a lift force (Laf), wherein a span of the aft foil (6) is at most 0.95 times a beam overall (BOA) of the vessel, the aft foil comprising a symmetric or asymmetric hydrofoil section, a lift coefficient (CL, af) and a zero lift angle (α0), as well as a chord (caf) having a chord length (Lc, af), wherein the chord of the aft foil (6) is configured to have a geometric angle (αg) with respect to the horizontal plane (HP) equal to 180 / (2π2) * l * CL, af + α0 – k * β, wherein k is between 0 and 1.25, and l is between 0 and 1.25.

The application discloses a kind of hot jet device and method for controlling underwater airfoil flow-induced noise, it relates to the field of acoustic measurement.It solves the problem of traditional flow-induced noise.The device of the present application is connected in order from the inlet pipe, the inlet ball valve, the hot jet tank, the jet ball valve from the heating tank to the outlet end direction, then connected into jet pipe, the outlet of jet pipe is connected with temperature sensor and flowmeter, the bottom of hot jet tank is connected with driving motor through steel wire rod, driving motor is connected with motor drive controller, finally water is ejected from the trailing edge area of underwater airfoil.The hot jet of the present application not only supplements the momentum of boundary layer and uses temperature to change the viscosity of water, can further stabilize flow field, effectively improve the sound stealth performance of underwater vehicle with airfoil structure.

A hydrofoil vessel (10) comprising several hydrofoils (20), each hydrofoil (20) having a wing (22) arranged to be submerged in water (16), such that the vessel (10) is lifted above water when cruising, said wings (22) being connected to a hull (12) of the vessel (10) by upright struts (14). Each wing (22) comprises an upright winglet (24) connected to the wing (22), said upright winglet (24) having an air intake (28) connected with air outlet apertures (26) on the wing (22).

The application relates to the technical field of ocean inflatable life-saving equipment, in particular to an inflatable boat with a split quick-release air supply device, which comprises a main boat body composed of a flexible inflatable air bag and a main air tank filled with high-pressure gas. The inflatable boat with the split quick-release air supply device is designed in a split type of the driving unit and the boat body, daily storage is facilitated, the boat body is conveniently folded and stored, and normal use is not affected; the split type design facilitates daily maintenance and detection, and reduces the maintenance difficulty and cost in the later period; the quick-release screw type design facilitates assembly before use, and operation is very simple; the detachable structure design can detach and discard the main air tank after inflation, thereby enhancing the loadable gravity of the inflatable boat; the externally-hung side-mounted inflatable life jacket can inflate the personal life-saving equipment of the passenger synchronously, and separation is facilitated, and safety is greatly improved.

A jet-propelled water-entry composite buffer device for multi-channel gas recycling includes a head fairing, an underwater vehicle, a buffer, a cavitator and a side fairing. The side fairing is internally provided with a fairing body and a sealing choke plate, and a high-pressure gas cavity, a transition cavity and a sub-high-pressure gas cavity are formed by the fairing body and the sealing choke plate from front to back; a quota air pressure valve is disposed on the sealing choke plate; the fairing body is provided with pressure reducing holes; the high-pressure gas cavity, the transition cavity and the sub-high-pressure gas cavity form an gas cushion buffer. Gas acceleration holes communicated with the high-pressure gas cavity are further provided in the outer wall of the side fairing, so that a supercavity can be more favorably formed after the underwater vehicle enters water.

The application discloses a disc-shaped two-degree-of-freedom cavitator structure, which comprises a shell, a spherical hinge unit is fixedly connected to the outer side end of the shell, a cavitator is arranged on the outer wall of one end of the spherical hinge unit, a stamping pipeline is fixedly connected to the other end of the spherical hinge unit, a driving unit is fixedly connected to the inside of the shell, the other end of the driving unit penetrates through the shell and is connected with the cavitator in contact, and a return unit is further arranged, one end of the return unit is fixedly connected with the cavitator, and the other end of the return unit is fixedly connected with the spherical hinge unit. The application further discloses a direction control method. The disc-shaped two-degree-of-freedom cavitator structure and the method thereof solve the problems that the existing multi-degree-of-freedom cavitator structure is complex and the performance of parts is affected.

This invention discloses a method for preparing a superhydrophobic drag-reducing coating and its application in a manta ray-inspired submersible prototype, belonging to the technical field of underwater drag reduction and surface functional materials. The method includes: dispersing micron-sized SiO2 and nano-sized SiO2 in ethyl acetate to obtain a first dispersion; dispersing PDMS in ethyl acetate to obtain a second dispersion; mixing and stirring the first and second dispersions, then adding a curing agent and long-chain perfluoroalkyl silane PFDTES, followed by spraying and curing to obtain a PFDTES-PDMS@SiO2 coating. This invention achieves a water contact angle >150° and a roll-off angle <9° through the synergistic effect of PFDTES long-chain fluorination modification, PDMS flexible bonding, and the micro / nano dual-scale SiO2 hierarchical structure. In the manta ray-inspired submersible application, a drag reduction rate of 14.43% is achieved at a flow rate of 0.5 m / s, and the performance remains stable after 24 hours of dynamic water flow impact. This invention features a simple process, controllable cost, and is suitable for drag reduction functionalization of complex curved underwater equipment.

This invention discloses a non-contact ship bottom cleaning machine based on pulse cavitation technology, comprising a mounting frame with a sealed box, inside which are pulse cavitation generation equipment and control equipment. Two drive wheels are fitted with transmission belts, the outer walls of which are fixed with permanent magnets. A drive mechanism for rotating a drive shaft is installed inside the sealed box. A mounting plate is mounted on the mounting frame, and multiple sets of dirt guiding mechanisms are installed on the mounting plate. This invention effectively solves the core technical bottlenecks of existing pulse cavitation cleaning robots, achieving integrated operation of non-contact, high-efficiency ship bottom cleaning and simultaneous dirt collection. It retains the advantages of pulse cavitation technology—high cleaning efficiency, no secondary damage, and environmental friendliness—while avoiding the impact of dirt diffusion on the moving mechanism, thus improving the machine's mobility and operational stability.

The application discloses a delta wing water-air cross-medium amphibious robot, and relates to the technical field of robots, which comprises a fuselage, a water power device, an underwater power device and a lifting device, the fuselage comprises a delta wing and a tail wing, the water power device, the underwater power device and the lifting device are all connected to the delta wing, the delta wing is triangular and has a front tip, the tail wing is connected to a rear side of the delta wing opposite to the front tip, the water power device is used for providing water surface navigation power for the delta wing water-air cross-medium amphibious robot, the underwater power device is used for providing underwater navigation power for the delta wing water-air cross-medium amphibious robot, and the lifting device is used for providing lifting power for the delta wing water-air cross-medium amphibious robot. The fuselage can be thinner, the displacement weight is reduced, the stability of underwater navigation is improved, the delta wing can increase the lift during flight, the cross-medium margin factor is improved, and the working efficiency during cross-medium is improved.

A vessel configured for transporting cargo can be configured to operate in a supercavitation mode, the supercavitation mode including releasing a fluid at least partially over an external surface, diverting at least a portion of the fluid to a propulsion system, and generating propulsion at least in part from the first fluid. In response to traveling in the supercavitation mode, the vessel can travel at high-speeds with a majority of the hull below a surface of a body of water.

A combined disc-type cavitation structure for underwater navigation of an underwater vehicle has an underwater vehicle and a fairing. A plurality of cavitators having sequentially increased outer diameters are sequentially arranged in the fairing. A cavitator receiving groove matched with the cavitator located on the front side is arranged in the center of the front surface of the cavitator located on the rear side in every two adjacent cavitators. The plurality of cavitators can be integrated into a whole by means of the cavitator receiving groove. The cavitator located at the front-most end is a first cavitator, and the remaining cavitators are second cavitators. The first cavitator is connected to the underwater vehicle by means of a buffer. Each second cavitator is respectively connected to the underwater vehicle by means of a driving device configured to axially move the corresponding second cavitator.

A device (10; 110) for a propeller (12) includes a body (18; 118), an inlet device (20; 120), and an outlet device (22; 122). The body (18; 118) is configured to be coupled to or form a portion of a hub (14) of the propeller (12). The inlet device (20; 120) is configured to receive a portion of a fluid passing outside the body (18; 118). The outlet device (22; 122) is configured to direct the fluid away from the body (18; 118). The device (10; 110) is configured to convert a flow of fluid received by the inlet device (20; 120) into an axial flow of fluid output from the device (10; 110), thereby preventing or at least mitigating formation of hub vortices downstream of the propeller (12).

The utility model discloses a ship superstructure with low wind resistance, which relates to the technical field of ship design and comprises a superstructure main body, a wind resistance reducing mechanism is arranged outside the superstructure main body, and the wind resistance reducing mechanism comprises two power wing-shaped plates. The side faces, close to each other, of the two power wing-shaped plates are fixedly connected with the two side faces of the upper-layer building body correspondingly, and adjustable wind shields arranged at equal intervals and driving rotating rods arranged at equal intervals are rotationally connected to the interior of each power wing-shaped plate. Through the cooperation of the superstructure main body, the power wing-shaped plate, the adjustable wind shields and the driving rotating rods, the superstructure main body is provided with the power wing-shaped plate, so that the phenomena of vortex and separation are reduced, and a plurality of adjustable wind shields and the driving rotating rods are arranged; the angle of the adjustable wind shield can be adjusted automatically through the wind speed sensor and the control system according to the sailing speed and the wind direction, and the effect of further improving the wind resistance reducing effect of the ship superstructure is achieved.

The provided is an inflatable whitewater kayak (hereinafter referred to as the kayak) with a narrow hull and a U-shaped bottom, which is a high-pressure narrow-type bottom weighted boat. The high-pressure narrow-type bottom weighted boat includes an inflatable and deflatable tubular body, where the tubular body includes a bow, a middle segment, and a stern; the bow, the middle segment and the stern are connected sequentially; the middle segment includes a bottom plate and two side tubes; the two side tubes are symmetrically disposed at two sides of the bottom plate; the bottom plate and the two side tubes define a central seating area; the side tube includes at least two sidewall subtube portions; and for the single side tube, the sidewall subtube portions are connected sequentially along a vertical direction to form a whole.