14 results about "Bulbous bow" patented technology

The invention discloses an anti-collision mechanism of a high-impact-resistance ship bow, and relates to the technical field of ship bow protection, the anti-collision mechanism comprises a bulbous bow, the end face of the bulbous bow is fixedly connected with a bow, the bulbous bow is internally provided with an impact cavity and a gas gathering cavity, the impact cavity is internally and fixedly connected with a reinforcing beam, the reinforcing beam is provided with a communicating hole, and the communicating hole is communicated with the gas gathering cavity. The bulbous bow has the advantages that the bulbous bow and the bow can be fully sealed, seawater or fresh water is prevented from flowing backwards, an alloy steel structure in the bulbous bow is prevented from being corroded or oxidized, the maintenance difficulty of the bulbous bow and the bow is reduced, the impact loss is further reduced, meanwhile, the bulbous bow is not prone to falling off, and the service life of the bulbous bow is prolonged. According to the anti-collision bulkhead, the collision loss is reduced, meanwhile, direct collision between the anti-collision bulkhead and an obstacle is avoided, the anti-collision bulkhead is not prone to being damaged, the safety of a ship is greatly improved, the sealing performance and the adsorption strength can be automatically adjusted according to the collision degree, the load at the welding position is prevented from being increased, and meanwhile the expected effect can be fully achieved.

The invention discloses a manufacturing method of a steel structure of a glass fiber reinforced plastic bulbous bow fairing, and the method specifically comprises the following steps: S1, fairing assembly division: dividing the fairing into a bulkhead middle assembly, a bottom middle assembly and a sonar deck middle assembly; s2, building a bulkhead middle assembly: building the bulkhead middle assembly by taking the bulkhead as a base plane; bottom middle assembly construction, wherein the bottom middle assembly is normally constructed with the outer plate as the base plane; s3, a sonar deck middle assembly is built, and the sonar deck middle assembly is built on the jig frame with the sonar deck as the base plane; s4, a positioning deck is installed according to the projected sonar deck line position, and radial ribs are installed according to the marked radial rib position lines; s5, marking out a radial rib allowance cutting line on the radial rib; and S6, the assemblies are folded, and construction of the steel structure of the air guide sleeve is completed. According to the invention, the positioning of the radial ribs is based on lineation, so that the positioning precision is improved; the allowance of the radial rib is subjected to lineation cutting by adopting a sample plate, so that the linetype precision is improved.

The utility model relates to a bulbous bow structure of a steamship. The bulbous bow solves the problems that in the prior art, a bulbous bow is large in traveling wave resistance and poor in stability. The bulbous bow comprises a bulbous bow body, overflowing assemblies are arranged on the two sides of the bulbous bow body, sealing cover plate assemblies are arranged on the outer walls of the overflowing assemblies in the circumferential direction, a movable load control mechanism is arranged in the bulbous bow body, and buoyancy supporting devices which can stretch under pressure are arranged on the two sides of the bottom of the bulbous bow body. The bulbous bow has the advantages that through linear optimization of the bulbous bow body, wave-making resistance is reduced, the purposes of reducing oil consumption and reducing carbon emission are achieved, and the sinking and floating stability of the bulbous bow body is effectively ensured.

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.

This invention relates to the fields of shipbuilding and ocean engineering and fluid mechanics, specifically to a multi-objective optimization design method for the bulbous bow of a large ship based on parametric modeling, comprising the following steps: S1: Dividing the geometry of the bulbous bow into multiple sections along the transverse and longitudinal directions, and fitting the shape of each section with a high-order polynomial; S2: Defining minimizing wave-making resistance as the first objective function. The second objective function is to maximize the seakeeping performance of the ship. The collaborative optimization objective is as follows: S3: Solve using a decomposition-based multi-objective evolutionary algorithm; S4: Verify the rationality of the Pareto optimal solution set obtained in step S3 through CFD simulation. This invention integrates parametric modeling, surrogate model acceleration, multi-objective evolutionary algorithm, and high-fidelity verification into a complete closed-loop system, reducing reliance on designer experience and shifting the bulbous bow design process from traditional manual trial and error to systematic and automated numerical optimization.

The invention discloses a ship turbine type bulbous bow device and a using method thereof.The ship turbine type bulbous bow device comprises a bulbous bow body and a central controller, a water flow sensor is fixedly installed at the lower end of the right side of the outer surface of the bulbous bow body, and a servo gear motor is fixedly installed at the right end of the top of an inner cavity of the bulbous bow body; an adjusting support is movably connected between the right ends of the two sides of the bulbous bow body through a bearing. Through the synergistic effect of the central controller, the water flow sensor, the servo gear motor and the servo electric cylinder, changes of the ship course and the water flow direction can be monitored in real time, the direction and the angle of the turbine blade are automatically adjusted, the bulbous bow body is made to adapt to complex sea conditions all the time, and the working efficiency is improved. The dynamic adjusting mechanism effectively overcomes the defect that the drag reduction effect of a traditional fixed bulbous bow fluctuates under variable working conditions, optimal reduction of wave-making resistance is achieved, and the overall energy efficiency of a ship under different navigation conditions is improved.

The invention provides a water jacket for folding a bulbous bow, which comprises a water jacket main body and mounting grooves formed in the two ends of the water jacket main body, adaptive seats are detachably connected in the mounting grooves, and the adaptive seats are provided with placing grooves matched with the outer wall of the bulbous bow, so that the outer wall of the bulbous bow is attached to the placing grooves when the bulbous bow is placed on the adaptive seats on the two sides; according to the method, underwater folding treatment can be conducted on the bulbous bow, the maximum ship length matched with a dock is increased, and the operation difficulty and risk of maintenance and replacement of the bulbous bow are reduced.

The invention provides an exoskeleton supporting mechanism of a ship bulbous bow block, and relates to the field of ship supporting mechanisms, the exoskeleton supporting mechanism is used for fixing and supporting a bulbous bow side segment and a deck side segment, the exoskeleton supporting mechanism comprises a base, supporting legs are installed at the bottom of the base, and a plurality of bulbous bow side segment positioning parts are arranged on the base from back to front at equal intervals. The exoskeleton supporting mechanism of the ship bulbous bow block is provided with the base, the first breast board, the second breast board and the fixator, and the whole bulbous bow is wrapped by the first breast board and the second breast board in an upward overturning mode. The center of the first breast board is in sliding fit with a base, the base is provided with an expandable air cushion, the position of the base can be adjusted according to needs through cooperation of a sliding rail and a soft steel cable, the base can be arranged in the shape of a bulbous bow, the fixing and supporting effect is enhanced, and the flexibility of the device is further improved. The second breast board, the floating board, the sponge board and the spring are matched to clamp the deck side segment. The device can perfectly wrap and support all positions of the bulbous bow.

The application discloses a hull parametric modeling method with bulb bow and bulb stern based on Grasshopper development. The first step is to extract hull lines and other information from a ship type library. The second step is to generate curves, position, sort, project and establish constraint relationships based on non-uniform B-spline curves. The third step is to generate a skin surface according to the defined hull topology structure and the spline curve established in the region. The step-by-step generation method is used to continuously extract the edge line of the generated surface for generating the NURBS surface of the next region. The generation sequence is: bulb bow, bow, bulb stern surface, bulb stern, hull, and hull transition area. The fourth step is to assemble and trim the propeller and rudder. The method solves the problems of low precision, weak hull shape control ability and difficulty in forming a closed surface in the bulb bow and bulb stern regions during the current hull parametric modeling, and the developed hull hydrostatic force analysis method can greatly improve the design efficiency.

The invention discloses a gravity and buoyancy balanced type telescopic bulbous bow device which comprises a bulbous bow and an adjusting module, the bulbous bow comprises a tail plate, a connecting structure and a telescopic body, the tail plate is connected with the telescopic body through the connecting structure, the adjusting module comprises a guide rail, an electric trolley and limiting blocks, the limiting blocks are installed on the upper surface and the lower surface of a fore peak, and the guide rail is connected with the electric trolley. A guide rail is arranged between the limiting block and the anti-collision bulkhead, an electric trolley is arranged on the guide rail, the tail plate is connected with the electric trolley, and the electric trolley drives the tail plate to move between the anti-collision bulkhead and the limiting block. The bulbous bow is designed to be in a gravity and buoyancy balance type, meanwhile, the control system is used for analyzing the ship navigation state, the length of the bulbous bow is automatically adjusted, the adaptability of the bulbous bow to different navigation states is effectively improved, and the wave-making resistance reducing effect of the bulbous bow is improved.

The invention provides a double-bow icebreaker structure for polar region mining, and belongs to the field of ship design and manufacturing. The problems that in the prior art, an icebreaker is large in resistance and poor in economical efficiency when sailing in open water, and a traditional single prow design cannot meet the requirements for long-distance sailing economical efficiency and high-strength icebreaking operation are solved. The ship comprises a ship body, a composite prow structure and a ballast water system, the composite prow structure is arranged at the prow of the ship body, and the ballast water system is arranged in the ship body and used for adjusting ballast water distribution in the ship body; the combined type stem structure comprises an icebreaking bow and a bulbous bow, the bulbous bow is arranged at the bottom of the icebreaking bow, and the ballast water system comprises a head ballast tank, a tail ballast tank and a pipeline for connecting the two ballast tanks. The integrated design of the double-function prow is adopted, a complex mechanical deformation mechanism is avoided, switching of working modes can be achieved only through a reliable ship control means of adjusting ballast water, the structure is simple, operation is convenient, and the maintenance cost is low.

This invention provides a welding method for a ship's bulbous bow, comprising: machining a V-shaped bevel on the outer side of the bulbous bow; assembling the bulbous bow by welding and fixing it to the inner side of the bulbous bow using positioning components; installing a ceramic gasket on the inner side of the bulbous bow, with the center of the ceramic gasket facing the back of the V-shaped bevel; installing a water-cooled slider on the front of the V-shaped bevel; using a flexible rail-mounted gas-electric welding trolley; formulating welding parameters for gas-electric all-position welding technology, including power supply polarity changes, welding wire distance, torch angle, oscillation width, and dwell time; performing single-sided welding with double-sided forming in gas-electric all-position welding; and inspecting the weld. This invention improves the assembly bevel form, changing from an inner Y-shaped bevel to an outer V-shaped bevel; and uses single-sided welding with double-sided forming in one step gas-electric all-position welding technology, reducing operational difficulty, improving the working environment, enhancing operational quality, and increasing operational efficiency.

The invention relates to the field of ship and ocean engineering and fluid mechanics, in particular to a large ship bulbous bow multi-objective optimization design method based on parametric modeling, which comprises the following steps: S1, dividing the geometric shape of a bulbous bow into a plurality of sections along the transverse direction and the longitudinal direction, and fitting the shape of each section by adopting a high-order polynomial to obtain a plurality of sections; the method comprises the following steps: S1, defining a collaborative optimization objective taking minimization of wave-making resistance as a first objective function and maximization of ship seakeeping as a second objective function, S3, solving by adopting a multi-objective evolutionary algorithm based on decomposition, and S4, carrying out CFD simulation verification on a Pareto optimal solution set obtained in the step S3, and verifying the rationality of the optimal solution set. According to the method, parametric modeling, proxy model acceleration, a multi-objective evolutionary algorithm and high-fidelity verification are integrated in a complete closed-loop system, dependence on experience of designers is reduced, and the bulbous bow design process is turned to systematic and automatic numerical optimization from traditional manual trial and error.

The utility model discloses a bulbous bow replacement tool assembly. The bulbous bow replacement tool assembly comprises a driving mechanism, a supporting frame body, a rolling mechanism and a hoisting mechanism. The driving mechanism is connected with the supporting frame body through a cable, and the rolling mechanism is installed at the bottom of the supporting frame body. The driving mechanism is used for dragging the rolling mechanism to roll so as to move out the old bulbous bow; the hoisting mechanism is arranged on the ship body in a hoisting mode and used for hoisting the new bulbous bow. The bulbous bow replacement tool assembly is simple in segmented dragging tool, convenient to disassemble and assemble and low in cost; the existing structure of the ship body is fully utilized through segmented hoisting, the requirement for the operation space is low, safety is better, and reliability is higher; meanwhile, a total station can be used for scanning and cutting the closure opening, the size of the closure opening of a new section is analyzed and corrected, and the positioning and mounting precision is high. Compared with the prior art, the construction period in the dock is greatly shortened.