37results about "Bilge keels" patented technology

The invention relates to a fin stabilization system adapted to minimize roll about the longitudinal axis of the boat during sharp cornering at very high speeds. In one form, equipment such as a machine gun is mounted to the bow of the boat and targets are adapted to be engaged in high-speed maneuvers when cornering and the deck of the boat is not excessively rolled whereby blocking visibility in a turn.

The invention discloses a foldable bilge keel with a groove-shaped base plate. The foldable bilge keel comprises the base plate and a rotary plate. The base plate is formed by connecting two structural styles, namely, base plate convex plates and base plate concave plates, in a staggered mode. A shaft sleeve is welded to the outer edge of the base plate, and a rotary shaft is arranged in the shaft sleeve. The rotary plate is composed of an inner plate and a cover plate, one end of the inner plate and one end of the cover plate are in rigid connection with the rotary shaft, the inner plate and the cover plate are arranged in a V shape, the inner plate is formed by connecting two structural styles, namely, inner plate convex plates and inner plate concave plates, in a staggered mode, the inner plate convex plates and the inner plate concave plates correspond to the base plate convex plates and the base plate concave plates in position, and therefore the inner plate can be attached to the base plate after rotating around the rotary shaft. The cover plate is a flat and straight plate, a front supporting box and a rear control box are fixed to the two ends of the rotary shaft through shaft sleeves in a welded mode, the shaft sleeves are rotatably connected with the rotary shaft, a rotary shaft driving device is arranged in the rear control box, and the rotary shaft is connected with the rotary shaft driving device. According to the structure, a folding state can be adopted in a limited channel or small wind waves, and damage such as grounding and collisions is avoided.

The invention relates to a bilge keel. A body structure of the bilge keel comprises a fixed clamshell structure (2) and a rotary clamshell structure (1) which are in a flat shape after being combined; the head and tail ends are in a streamline shape; the fixed clamshell structure (2) is fixedly connected to a bilge strake (3); the rotary clamshell structure (1) is connected with the fixed clamshell structure (2) through a rotary shaft system; the rotary shaft system is used for opening and closing the rotary clamshell structure (1). The bilge keel can increase the rolling damping of a ship, effectively reduce rolling of the ship and enhance the rolling stability.

The invention relates to the field of designing displacement vessels with an air cavity on the bottom. A displacement vessel has a recess in the bottom for the formation of a single air cavity with a wave-like profile, the recess beginning at a step in the bow and being delimited by skegs along the sides and a stern arch in the form of an inclined plate. The cavity of the recess is connected to a pressurized air supply; inside the recess there are longitudinal keels to restrict the transverse movement of the air, and transverse baffles in the form of inclined plates are arranged one after the other in a streamwise direction such that they can be deployed into a working position and folded back adjacent to the bottom. Downstream of the step in the bow which forms the recess, a plate is mounted such that it can pivot by means of the lowering or raising of the leading edge thereof about a spindle that is transverse to the bottom, said spindle being connected to the plate and being fastened to the surface of the bottom recess. The streamwise length of the plate is such that as the plate pivots about the spindle it joins the surface of the bottom upstream of the step with the surface of the bottom inside the recess in order to prevent flow separation downstream of the step. The plate is capable of limiting the lowering of its leading edge to the level of the bottom of the ship in the region of the step. The invention provides a ship with improved performance characteristics.

The invention relates to the field of ships, and particularly discloses a ship bottom structure and a fatigue life computing method thereof. The ship bottom structure comprises an inner bottom longitudinal bone, an outer bottom longitudinal bone, a reinforcing rib and a rib plate, wherein the outer bottom longitudinal bone is parallel to the inner bottom longitudinal bone, the reinforcing rib is connected with the inner bottom longitudinal bone and the outer bottom longitudinal bone, and the rib plate is connected to one side of the reinforcing rib; and the two ends, in the height direction, of the rib plate are connected to the inner bottom longitudinal bone and the outer bottom longitudinal bone correspondingly, and the rib plate is a flat plate. According to the ship bottom structure, the rib plate is the flat plate, compared with a rib plate structure in the prior art, the rib plate in the ship bottom structure does not need to be provided with a toggle plate, the rigid requirement for the inner bottom longitudinal bone and the outer bottom longitudinal bone of the ship bottom structure can be met by adopting the rib plate, the weight of the structure is lowered, the structural form is simplified, the welding workload is reduced greatly, the construction efficiency is improved, and meanwhile, due to the fact that the toggle plate does not need to be arranged, the weight of a ship is lowered, and the production cost of the ship bottom structure is further saved.

A twisted rudder blade for a ship having a twist that is adapted to the configuration of the flow of the water in the region of the rudder blade if no propeller in operation is disposed in front of the rudder blades in the direction of travel of the ship.

The invention relates to a control method of a frog mouth type bilge keel. A main structure of the frog mouth type bilge keel comprises a fixed clamshell structure (2) and a rotary clamshell structure (1). The rotary clamshell structure (1) is connected with the fixed clamshell structure (2) through a rotary shaft system. The control method of the frog mouth type bilge keel includes the steps that when a ship sails, the rolling angle, the angular speed and the angular accelerated speed of the ship are monitored, ship draught information is obtained, and the ship stability change is checked; if any index of the three parameters including the rolling angle, the angular speed and the angular accelerated speed continuously exceeds the upper limit of a corresponding safety threshold value within a set time, a motor is used for driving the rotary shaft system to unfold the rotary clamshell structure of the bilge keel; and if the three parameters including the rolling angle, the angular speed and the angular accelerated speed are continuously lower than the lower limit of the corresponding safety threshold value within the set time, the motor is used for driving the rotary shaft system to fold the rotary clamshell structure of the bilge keel. By the adoption of the control method of the frog mouth type bilge keel, the bilge keel can be intelligently controlled to be unfolded and folded; and the rolling damping of the ship can be increased, rolling of the ship is effectively reduced, and rolling stability is enhanced.

The disclosure relates to a fin stabilization system adapted to minimize roll about the longitudinal axis of the boat during sharp cornering at very high speeds. In one form, equipment such as a machine gun is mounted to the bow of the boat and targets are adapted to be engaged in high-speed maneuvers when cornering and the deck of the boat is not excessively rolled whereby blocking visibility in a turn.

A twisted rudder blade for a ship having a twist that is adapted to the configuration of the flow of the water in the region of the rudder blade if no propeller in operation is disposed in front of the rudder blades in the direction of travel of the ship.

A watercraft (99) having a stepped hull (100) including a forward hull portion (103), a first stepped hull portion (106), and optionally a second stepped hull portion (108). Outboard ram air fins (120) extend outwardly from the hull and downwardly along the stepped hull portions. Outboard strakes (110, 112) are fixed to the stepped hull portions, and may be tapered to define ports thereto. During planing operation the channels defined by the fins compress the incoming air which is thereby at least partially forced under the stepped hull portion. In level operation the flow through the channels tends to keep the stepped hull portions in good contact with the water.

A box shaped bilge keel comprises a convex polygonal shaped cross-section. Further, the box shaped bilge keel extends along a pre-determined length of a hull of a floating vessel. Also, the box shaped bilge keel is providing additional width to the hull at the bottom of the floating vessel.

A vessel having an elongated shape, and being moored to the sea bed in a substantially fixed orientation. The vessel includes at least along its longitudinal sides, near keel level, two transverse skirts having such a width that the natural roll period of the vessel is above a predetermined period, the natural roll period of the vessel without the skirts being below the predetermined period.

The invention relates to the technical field of ship engineering, in particular to a composite material sailing boat with a wing keel slot. The composite material sailing boat with the wing keel slot comprises a boat body, a wing keel and the like, wherein the wing keel is connected with the bottom of the boat body. The composite material sailing boat with the wing keel slot is characterized in that: a slot matched with the upper end of the wing keel is reserved at the bottom of the boat body. In a boat body manufacturing process, the installation efficiency of workers is effectively improved and the labor intensity of the workers is greatly reduced in a mode of reserving the slot matched with the upper end of the wing keel at the position of the wing keel at the bottom of the boat body; simultaneously, the upper end of the installed wing keel is completely hidden in the slot at the bottom of the boat body, so that the disadvantages of great sailing resistance, low speed and the like because the upper end of the wing keel is exposed in sea water in the prior art are overcome. The composite material sailing boat has the advantages that the structure is reasonable, the sailing boat is convenient to install, raw materials are saved and the like.

The invention discloses an anti-rolling bilge keel design method. The method comprises the steps that the length of a bilge keel and the arrangement range of the bilge keel in the ship length direction are determined; the mounting point and the shape maximum allowable width of the bilge keel are determined; a hull surface flow line which passes through the mounting point at the maximum transversesection and is located within the bilge keel arrangement range is determined to serve as a mounting line; hull transverse section lines of the multiple positions are cut out, the shape maximum allowable widths of all positions of the bilge keel are determined, and a shape maximum allowable width limit line of the bilge keel is drawn; the bilge keel structure maximum width is determined, and a structure maximum width limit line of the bilge keel is drawn; the parts, with the smaller width, of the shape maximum allowable width limit line and the structure maximum width limit line are selected for splicing, width gradient lines of the head end and the tail end of the bilge keel are designed, and a final bilge keel width limit line is obtained; structural design of the bilge keel is carried out. Accordingly, compared with a traditional method, the designed anti-rolling bilge keel has lager width, area and rolling damping.

The invention discloses a foldable bilge keel with a groove-shaped base plate. The foldable bilge keel comprises the base plate and a rotary plate. The base plate is formed by connecting two structural styles, namely, base plate convex plates and base plate concave plates, in a staggered mode. A shaft sleeve is welded to the outer edge of the base plate, and a rotary shaft is arranged in the shaft sleeve. The rotary plate is composed of an inner plate and a cover plate, one end of the inner plate and one end of the cover plate are in rigid connection with the rotary shaft, the inner plate and the cover plate are arranged in a V shape, the inner plate is formed by connecting two structural styles, namely, inner plate convex plates and inner plate concave plates, in a staggered mode, the inner plate convex plates and the inner plate concave plates correspond to the base plate convex plates and the base plate concave plates in position, and therefore the inner plate can be attached to the base plate after rotating around the rotary shaft. The cover plate is a flat and straight plate, a front supporting box and a rear control box are fixed to the two ends of the rotary shaft through shaft sleeves in a welded mode, the shaft sleeves are rotatably connected with the rotary shaft, a rotary shaft driving device is arranged in the rear control box, and the rotary shaft is connected with the rotary shaft driving device. According to the structure, a folding state can be adopted in a limited channel or small wind waves, and damage such as grounding and collisions is avoided.

The invention discloses an outline of an oceanographic engineering ship. A head part of the engineering ship is provided with a forward bent turtle back type spherical head; the spherical head is provided with a peach-pit type cross section and a V-shaped forebody; the outline of the head part is smoothly transited from a head shoulder part to a ship middle part; the bottom of a middle section of the ship is made into a bevel type bilge and is respectively and gradually transited from a ship head section and a stern section to a circular bilge along a longitudinal direction; large-size triangular box-shaped bilge keels are arranged on two sides of the bevel type bilge at the bottom of the middle section; a bottom longitudinal flow barge outline is adopted in a middle tail part of the ship; and the bottom is linearly warped upwards. The outline of the oceanographic engineering ship meets the requirements of energy conservation and environmental protection of the oceanographic engineering ship while efficiently reducing the unavoidable responding amplitude for terrible weather and marine environment of the oceanographic engineering ship, thereby achieving an excellent fluid dynamical property, reducing resistance by 19%, promoting 0.5 times of shipping speed and being characterized by safety and reliability.

A flow control mechanism, for improving pressure resistance and hull vibration, includes a lower fin and an upper fin. The lower fin is disposed between a second station and a fourth station in a length direction of a ship and between 10% and 20% of a design draft from a bottom of the ship in a height direction of the ship, the lower fin being inclined at an angle of 20 to 40 degrees with respect to a design draught (or base) line. The upper fin is disposed between the second station and the fourth station in the length direction of the ship and between 30% and 60% of the design draft from the bottom of the ship in the height direction of the ship, the upper fin being inclined at an angle of 10 to 30 degrees with respect to the design draught (or base) line. Further, an additional fin is disposed between a first station and a third station in the length direction of the ship and between 5% and 20% of the design draft from the bottom of the ship in the height direction of the ship, the additional fin being inclined at an angle of 10 to 40 degrees with respect to the design draught (or base) line.

A flow control mechanism, for improving pressure resistance and hull vibration, includes a lower fin and an upper fin. The lower fin is disposed between a second station and a fourth station in a length direction of a ship and between 10% and 20% of a design draft from a bottom of the ship in a height direction of the ship, the lower fin being inclined at an angle of 20 to 40 degrees with respect to a design draught (or base) line. The upper fin is disposed between the second station and the fourth station in the length direction of the ship and between 30% and 60% of the design draft from the bottom of the ship in the height direction of the ship, the upper fin being inclined at an angle of 10 to 30 degrees with respect to the design draught (or base) line. Further, an additional fin is disposed between a first station and a third station in the length direction of the ship and between 5% and 20% of the design draft from the bottom of the ship in the height direction of the ship, the additional fin being inclined at an angle of 10 to 40 degrees with respect to the design draught (or base) line.

The disclosure relates to a fin stabilization system adapted to minimize roll about the longitudinal axis of the boat during sharp cornering at very high speeds. In one form, equipment such as a machine gun is mounted to the bow of the boat and targets are adapted to be engaged in high-speed maneuvers when cornering and the deck of the boat is not excessively rolled whereby blocking visibility in a turn.

The invention provides a shallow-draft rapid-flow route segment passenger ferry which comprises a ferry body and a building on the ferry body, the building on the ferry body is arranged on the ferry body, the prow of the ferry body is a longitudinal flow prow, the stern of the ferry body is in a round bilge line shape, and the bilge of the ferry body is higher than the lowest point of the bottom of the ferry body. The middle part between the bilge of the ferry body to the ferry head is a dipper-shaped member. And the bilge of the ship body is gradually transited to the stern to form a flat bottom. Compared with the prior art, the ferry has the following beneficial effects that by modifying the bow, the stern and the bilge of the ship body, the resistance of the ship during sailing is reduced, and the technical problem that the sailing speed of a shallow-draft ship in a long and narrow torrent water area is difficult to increase due to large sailing resistance is solved; the technical effect of stably sailing at a high speed in long and narrow torrent under the condition that shallow draft is met is achieved.

The invention relates to a slide boat structure, which includes a hull, a jet pump protection frame and a self-righting device are installed at the tail of the hull, a driving console is arranged in the middle of the hull, and a The light frame can be tilted, and the driver is seated behind the driving console; multiple passenger seats are arranged at the front of the hull; the main engine is installed inside the hull below the driving console, and the main shaft output by the main engine is connected to the jet pump , the inside of the hull below the passenger seat is a fuel tank; a boat hook is installed at the bow of the hull; fenders are arranged on the outer ring of the upper surface of the hull, and handguards are arranged at intervals on the fenders. Change the structure of the hull, prolong the service life of the hull, and improve the reliability of the whole machine.

The invention relates to a sliding rail boat structure.The sliding rail boat structure comprises a boat.A jet-pump protection frame and a self-centering device are installed at the tail of the boat, a driving control table is located in the middle of the boat, an inclinable lamp bracket is installed on the driving control table, and a driver seats behind the driving control table; a plurality of passenger seats are located at the front portion of the boat; a main engine is installed at the portion, located below the driving control table, inside the boat located, a main output shaft of the main engine is connected with a jet pump, and an oil box is arranged at the portion, located below the passenger seats, inside the boat; a boat hook is installed at the head of the boat; fenders are arranged on the outer ring of the upper surface of the boat, and hand guards are arranged on the fenders at intervals.The structure of the boat is changed, the service life of the boat is prolonged, and the use reliability of the whole machine is improved.