467 results about "Hull structure" patented technology

A whole ship strain field rapid reconstruction method using ship motion and discrete strain information can rapidly reconstruct a whole ship structure strain field through fusion analysis of ship motion information and finite discrete strain monitoring data, and provides a more reliable reference basis for ship structure safety assessment and auxiliary decision making. The method comprises the following steps: firstly, acquiring ship motion monitoring data, and establishing a wave time-frequency parameter inversion Kalman filtering model based on ship motion information; secondly, according to the wave height obtained through inversion, the wave pressure load on the surface of the ship body is solved by combining phase parameters and relative positions of the wave surface and the ship body; thirdly, establishing a whole ship structure strain field dynamic reconstruction artificial intelligence model fused with a physical information neural network-finite element method, and formulating a layout strategy of measuring points; and finally, performing network parameter optimization on the PINN-FEM strain field reconstruction model by using strain monitoring data of finite discrete measurement points, and improving the overall calculation precision of the model.

The invention provides a greedy algorithm-based unreinforced hull plate inverse finite element measuring point optimal arrangement method, and belongs to the field of ship structure health monitoring. The problem that it is difficult to reduce the number of arranged measuring points under the condition that the required reconstruction precision is kept is solved. The method comprises the steps that discretization processing is conducted on an unreinforced hull plate, and the unreinforced hull plate is divided into four-node units meeting preset conditions; generating a primarily selected measuring point scheme, namely arranging measuring points along the diagonal direction of a ship body plate, and performing array copying and segmented movement to obtain a plurality of initial measuring point arrangement schemes; and inputting the primarily selected measuring point scheme into a greedy algorithm, performing cyclic displacement reconstruction and node error calculation in combination with an inverse finite element method, iteratively removing the measuring point which has the minimum influence on the reconstruction error until all unit errors meet a preset precision threshold value, and outputting an optimized arrangement scheme which has the minimum number of measuring points and meets the precision requirement. The method is mainly used for hull structure safety assessment in the whole life cycle.

The invention provides a ship service platform. The ship service platform comprises a deck, a supporting frame and a plurality of connecting pieces. The deck is laid on a hull frame structure of a ship; the supporting frame is provided with a transformer base platform frame and a frequency conversion equipment base platform frame, and the transformer base platform frame and the frequency conversion equipment base platform frame are arranged at the bottom of the deck and support corresponding areas on the deck; and the connecting piece is used for connecting the transformer base platform frame and the frequency conversion equipment base platform frame and connecting the ship body frame structure. The supporting frame is additionally arranged through the transformer base platform frame and the frequency conversion equipment base platform frame, the influence of vibration on the whole ship body structure is reduced, further caused damage is reduced, and the technical problem that in the prior art, a part of equipment is lacked for reducing damage to a ship body deck and reducing damage to a deck structure is solved.

The invention relates to a slamming strength evaluation method for a duct fin at the tail of a ship, which comprises the following steps of: (1) establishing finite element models of the duct fin and an adjacent ship body structure, and setting boundary conditions; (2) selecting the lower surface of the upper region of the conduit and the lower surface of the fin as slamming pressure acting surfaces, and calculating a slamming pressure peak value of each point; (3) applying slamming pressure to the finite element model, and applying a slamming pressure peak value as a static load to a plurality of local areas of the conduit and the fin to generate different loading conditions; and (4) calculating the structure response, evaluating the Von Mises stress of the plate shell unit and the axial stress of the rod unit, and judging whether the Von Mises stress and the axial stress meet the allowable stress related to the grid size or not. Compared with a method for calculating the slamming load based on CFD, the slamming strength evaluation method has the advantages that the calculation efficiency is extremely high, and the slamming strength of the conduit fin can be quickly evaluated in a short time; the method is more suitable for slamming pressure calculation of the tail conduit fin, and the considered loading mode is more comprehensive.

The invention discloses a ship independent liquid cargo tank traction floating stopping mechanism and a supporting system. According to the traction floating stopping mechanism and the supporting system, the traction floating stopping mechanism (6) is arranged between the inner bottom of a main hull structure (1) and the bottom of an independent liquid cargo tank (2), and the traction floating stopping mechanism can form downward traction on the independent liquid cargo tank based on the main hull structure; the traction floating stopping mechanism comprises two rope fixing seats (61) and a traction rope (62), the two rope fixing seats are fixedly arranged at the inner bottom of the main ship body structure and the bottom of the independent liquid cargo tank respectively, and the two ends of the traction rope are assembled and connected with the two rope fixing seats respectively; the supporting system comprises the traction floating stopping mechanisms, and the multiple traction floating stopping mechanisms are evenly and discretely arranged. When the main hull structure is damaged, water enters the independent liquid cargo tank, and the independent liquid cargo tank begins to float upwards, the independent liquid cargo tank cannot float upwards and collide with the main hull structure under the traction action of the traction floating stopping mechanism.

The invention belongs to the technical field of ship body structure health monitoring, and provides a ship body structure health monitoring method based on digital twinning, which comprises the following steps: S1, acquiring multi-dimensional data such as stress, strain, vibration and temperature of a ship body structure in real time by using various sensors arranged on the ship body structure; s2, on the basis of the collected historical data, combining a physical model, material attributes and manufacturing process information of the ship body structure, constructing a digital twin body of the ship body structure; s3, performing feature extraction on the data acquired in real time; according to the invention, the multi-dimensional data of the hull structure is collected in real time and the digital twinborn body is constructed, so that comprehensive and real-time monitoring and accurate evaluation of the hull structure are realized; according to the method, abnormal data in the ship body structure can be found in time, the future health state of the ship body structure can be predicted, powerful support is provided for maintenance and reinforcement decisions, early warning can be conducted in time when the health state is abnormal, the safety and reliability of the ship are effectively improved, and the maintenance cost is reduced.

The embodiments of the present disclosure provide a method for mounting a membrane-type containment system carrying cryogenic liquid cargo. A membrane-type containment system comprises a primary membrane layer, fastening engagement plates, a primary insulation layer, a secondary membrane layer and a secondary insulation layer, which are sequentially connected and fixed to a hull structure by means of penetrating fasteners, wherein the primary membrane layer, the primary insulation layer, the secondary membrane layer and the secondary insulation layer enclose to form a cryogenic liquid cargo storage tank for containing an ultra-low-temperature medium. In a planar area, the method comprises: mounting spacer plates on a bulkhead of the hull structure according to set marked lines, and mounting secondary insulation modules on the spacer plates; performing fixation by means of the penetrating fasteners; after mounting is completed, mounting the secondary membrane layer and primary insulation modules in sequence; then mounting each fastening engagement plate disposed above a gap formed by two adjacent primary insulation modules; and mounting the primary membrane layer, wherein the boundary of each primary membrane is welded and fixed to fixing welding plates and sealing metal pieces provided on the fastening engagement plates disposed on the primary insulation modules.

The invention provides a ship equipment base modeling method and a ship, and relates to the field of ship manufacturing, and the ship equipment base modeling method comprises the following steps: creating a universal base template, and creating an equipment model; a base structure form is supplemented on the basis of the universal base template, and a virtual universal base model is created and put into a base model library so as to be convenient to call; and reading the installation interface and weight information of the equipment, calling the virtual universal base model, and generating an equipment virtual base model under the structure tree of the equipment model. Arranging the equipment virtual base model and the equipment model on the whole ship body structure; and according to the final arrangement position of the equipment model, the equipment virtual base model identifies the boundary of the hull structure, matches the corresponding plate thickness and material, and automatically converts the equipment virtual base model into an entity base model. According to the method, rapid generation of the equipment base model can be achieved, it is guaranteed that the technical state consistency of the bases of equipment of the same specification is adjusted adaptively after the whole ship is arranged for multiple times, and the base modification efficiency is improved.

The invention provides an unmanned ship grabbing and positioning system based on multi-body configuration design, and belongs to the technical field of unmanned ships, the unmanned ship grabbing and positioning system comprises a multi-body ship body, a machine vision module, a positioning calculation unit, a stable platform, a grabbing device and a control module, the multi-body ship body is composed of a double-hull structure or a three-hull structure; the machine vision module is used for identifying a target object and acquiring visual information of the target object; the positioning calculation unit is connected with the machine vision module and is used for calculating spatial position coordinates of the target object according to the acquired vision information; the stable platform is arranged on the multi-hull ship body; the grabbing device is installed on the stable platform and used for grabbing the target object according to the coordinates calculated by the positioning calculation unit. The robot has the comprehensive advantages of being high in environmental adaptability, high in positioning precision, flexible in operation, good in controllability, high in maintainability and the like, and can efficiently cope with target object grabbing operation in the complex water environment.

The invention belongs to the technical field of ships, and discloses a steering engine system installation method which comprises the following steps that a steering engine room is inverted, a steering engine platform is located above an operation area, and a rudder hole is perpendicular to the operation area; hoisting the rudder stock and loading the rudder stock into the rudder hole; the steering engine is placed on a rest stand above the steering engine base and located above the rudderstock; the rudderstock is moved until the lower end of the rudderstock is located below the upper rudder twist and above the lower rudder twist, and then the rudder blade is installed at the lower end of the rudderstock; the steering engine is lifted upwards and leaves the rest stand, after the rest stand is removed, the steering engine is downwards placed on the steering engine base and assembled with the rudderstock, the steering engine and the rudderstock are smoothly installed by adjusting and optimizing the installation sequence of the steering engine system and through a space and time dislocation method, and normal press-fitting operation can be conducted under the condition that the deck layer height is insufficient. In addition, the installation method avoids forming process holes in the hull structure, avoids damaging the hull structure and the strength, and also reduces the workload of field installation.

The invention discloses a cable penetration assembly structure trepanning inspection method, device and program based on AM software, and the method comprises the steps: carrying out the collision inspection of a cable penetration assembly model and a hull structure, giving out an alarm prompt if there is interference, or obtaining the position coordinate and direction information of a cable penetration assembly, establishing a virtual cable penetration assembly based on the obtained coordinate and direction information, and then extending the section of the virtual penetration assembly; performing collision inspection on the extended virtual penetration assembly and the ship body structure, and if no interference exists between the extended virtual penetration assembly and the ship body structure, giving an alarm prompt; if interference exists, tapping is normal. And finally, based on the names of the structural grillages, the assembly names and the plate materials of the structural grillages are called, the assembly flow direction codes of the structural grillages are obtained through the assembly names, and installation stage matching and material matching are carried out. According to the invention, the cable penetration piece structure can be subjected to rapid trepanning inspection, and the working efficiency is greatly improved.

The split mounting type non-self-propelled cutter suction dredger body structure comprises a main buoyancy tank and side buoyancy tanks, and each side buoyancy tank is formed by sequentially connecting a first-section side buoyancy tank single body, a middle-section side buoyancy tank single body and a tail-section side buoyancy tank single body; a first sealing transition void cabin and a second sealing transition void cabin are arranged at the splicing ends of the head section and the middle edge buoyancy tank single bodies and are in sealing connection through fasteners; a third sealed transition void is arranged on the side, close to the main buoyancy tank, of the middle side buoyancy tank single body, a fourth sealed transition void is arranged on the side, close to the middle side buoyancy tank single body, of the tail side buoyancy tank single body, a fifth sealed transition void is further arranged on the tail side buoyancy tank single body, and the third sealed transition void and the fifth sealed transition void are connected with the main buoyancy tank in a sealed mode. A main buoyancy tank sealing chamber corresponding to the sealed transition void is welded to the inner wall of the main buoyancy tank body, a sealing assembly is arranged between the main buoyancy tank sealing chamber and the sealed transition void, and sealed connection or detachment of the side buoyancy tanks and the main buoyancy tank is achieved by operating the sealed transition void. The structure is matched with the sealing transition void and the sealing assembly, the problems that a traditional splicing mode is low in construction efficiency, poor in sealing performance, inconvenient to maintain and the like are effectively solved, and the ship body splicing construction efficiency and reliability are improved.

The invention provides an underwater vehicle stern shell structure noise reduction method, and relates to the technical field of underwater vehicle noise reduction, and the method comprises the steps: obtaining the structure data of an underwater vehicle and a vibration signal in the operation process; determining a noise reduction target for the underwater vehicle according to the vibration signal; obtaining constraint conditions for the underwater vehicle; analyzing stern flow field characteristics and horseshoe vortex formation of the underwater vehicle on the basis of fluid dynamics analogue simulation; the method comprises the following steps: arranging a transition part of the underwater vehicle, vortex eliminating rectiblocks and reinforcing ribs; simulating vibration sound radiation of the underwater vehicle under fluid excitation by applying a finite element method in combination with sound-structure interaction analysis; optimizing the size of the transition part and the mounting position of the vortex elimination rectifying piece, and further optimizing the design parameters and the mounting position of the reinforcing rib by using a genetic algorithm; and outputting the target setting position of the reinforcing rib when the vibration sound radiation reaches the noise reduction target. According to the invention, systematic noise reduction analysis of the underwater vehicle structure can be realized.

Provided is a mounting method for a dihedral-corner-area arrangement structure of a thin-film-type enclosure system. The thin-film-type enclosure system comprises a main-layer thin film layer, a fastening attachment plate, a main-layer insulating layer, a secondary-layer thin film layer and a secondary-layer insulating layer, which are sequentially connected and fixed to a ship body structure by means of penetrating fasteners. The mounting method comprises: according to set scribe lines and on a cabin wall of the ship body structure, mounting spacer plates and studs for positioning the spacer plates for a dihedral-corner-area planar transition secondary insulating module and a dihedral-corner-area secondary insulating module in a secondary-layer dihedral corner area; and then mounting the dihedral-corner-area planar transition secondary insulating module, the dihedral-corner-area secondary insulating module and other modules. A double-layer sealed storage carrier for an ultra-low-temperature medium is effectively built, and storage and leakage-prevention problems of the ultra-low-temperature medium are solved.

The invention provides a ship part assembling and positioning method and device. The ship part assembling and positioning method comprises the following steps that a three-dimensional model database is constructed, wherein the three-dimensional model database comprises three-dimensional models of ship parts and three-dimensional model assembling related data; obtaining and analyzing instruction data of a user; the to-be-assembled ship parts and the surrounding environment thereof are sensed, and the spatial positions and the inclination angles of the to-be-assembled ship parts in the actual environment are obtained; according to the spatial position of the to-be-assembled ship part in the actual environment and the spatial position of the to-be-installed ship equipment or ship body structure in the actual environment, path planning is conducted on the to-be-assembled ship part; and obtaining contour features of the to-be-assembled ship parts according to the extracted three-dimensional models of the to-be-assembled ship parts and the three-dimensional model assembly related data, and projecting the contour features of the to-be-assembled ship parts on the to-be-installed ship equipment or ship body structure by adopting a projection device.

The invention relates to a combined type ship independent cabin vertical limiting device which comprises a combined type vertical support, and the combined type vertical support comprises a support upper structure, a support lower structure, laminated wood and a floating stopping limiting structure. The support lower structure and the support upper structure abut against each other through laminated wood and are connected in a pulling mode through a floating-stopping limiting structure. The combined vertical support is arranged in a gap between the bottom of the independent cabin and the ship body structure; the upper end of the support upper structure is fixedly connected with the independent cabin structure, and the support lower structure is fixedly connected with the hull structure. The opposite-pull type upper and lower connecting bolts or clamping plates are additionally arranged on the vertical support at the bottom of the independent cabin, so that the function of limiting floating of the independent cabin is achieved, the structural strength of an original vertical support is utilized, additional structural reinforcement is not needed, and the steel cost is greatly saved.

The invention discloses a mud flat sampling assisting tool which comprises a guide body, the guide body is of a hull structure, and side plates on the two sides of the guide body in the length direction protrude out of the bottom face; a sample box and a driving mechanism are mounted on the frame; the hollow box body is mounted at the bottom of the frame; the anti-sinking wheels are installed on the two sides of the frame, the anti-sinking wheels are in transmission connection with the driving mechanism, each anti-sinking wheel comprises a plurality of arc-shaped mud plates, the arc-shaped mud plates are circumferentially distributed at intervals, the central angle of each arc-shaped mud plate ranges from 90 degrees to 180 degrees, and the length of each arc-shaped mud plate ranges from 30 cm to 100 cm; the direction adjusting mechanism is mounted at one end of the frame and is connected with the guide body; when the direction adjusting mechanism is driven, the direction adjusting mechanism drives the guide body to rotate. The mud flat sampling device has the characteristics of floating on the mud flat, carrying people, consigning tools required by mud flat sampling, moving a sampled sample forwards and the like.

The invention provides a ship electric power control system, and belongs to the technical field of power generation, and the system comprises a shaft power generation system which comprises a shaft power generator and a shaft power generation frequency conversion cabinet; the shaft generator is of an up-and-down split structure and comprises a rotor and stators, the rotor is installed on a ship main propulsion shaft, and the stators are located around the ship main propulsion shaft; the rotor is driven by a ship main propeller shaft to rotate and is matched with the stator to generate electricity, and the stator is of an up-down split structure; and the shaft power generation frequency conversion cabinet is electrically connected with the shaft power generator and is used for converting the electric energy generated by the shaft power generator into electric energy required by a ship power grid. The rotor and the stator of the shaft generator are of an up-down half-split structure, the shaft generator can adapt to the surrounding installation environment of the ship main propeller shaft, the installation process is simplified, the damage risk of the ship body structure is avoided, the shaft generator and the shaft generator frequency conversion cabinet are reasonable in layout, the electric energy conversion control precision can be guaranteed, and the electric energy transmission efficiency is improved; the problem that the power supply efficiency is affected by structure and layout problems is solved.

The invention provides PMMA (polymethyl methacrylate) liquid resin with a flame-retardant function and a preparation method of a ship based on a PMMA liquid resin continuous fiber composite material, and belongs to the technical field of polymer composite material preparation. According to the invention, the continuous fiber material is uniformly laid in the mold, and a vacuum assisted resin transfer molding (VARTM) process is adopted to ensure that the material is fully infiltrated and bubbles are eliminated. The PMMA liquid resin and the continuous fibers are fully combined through normal-temperature curing or heating curing, and a firm hull structure is formed. According to the method, the lightweight, corrosion resistance, transparency and impact resistance of the ship can be effectively improved, and the problem that the thermosetting resin glass fiber reinforced plastic ship cannot be recycled is solved. The whole ship is completely prepared from acrylic resin, complete separation of PMMA and fibers can be achieved by adopting a recovery method with MMA as a solvent, no solid waste exists in the whole process, closed-loop recovery of resources is achieved, and the method has great significance in energy conservation and environmental protection.

The water surface oil stain treatment device capable of reducing oil stain breaking comprises a ship body structure, a bionic driving structure, symmetrically-arranged oil stain treatment structures, an oil storage cavity, an oil discharge structure and a first fixing base are arranged on the ship body structure, a steering engine is arranged on the first fixing base, and a rudder plate is arranged at the output end of the steering engine. By the adoption of the structure, the bionic web drive can reduce the influence on water flow on the water surface as much as possible, and the oil surface is not prone to being broken and diffused in the advancing process; assembly line greasy dirt treatment, continuous greasy dirt adsorption and rapid extrusion and collection are achieved, the working time is greatly prolonged, and continuous and stable work is achieved; the oil stain treatment part is flexible to adjust and can accurately act on oil stains on the water surface under different immersion depths, so that the oil stain treatment quality is improved, and the working efficiency is obviously improved.

The invention relates to a ship launching method, and belongs to the technical field of ship building and launching. The method comprises the steps that S1, the inclined shipway unit is divided into a plurality of first supporting areas and second supporting areas which are distributed in a staggered mode; s2, a coupling beam platform is arranged on at least one second supporting area, and supporting cross beams are arranged on the other first supporting areas; the two sides of the coupling beam platform extend outwards from the middle longitudinal buoyancy tank, the two ends of the coupling beam platform are in lap joint with the two inclined shipway units respectively, and the coupling beam platform, the supporting cross beam and the supporting face of the first supporting area are coplanar. S3, the longitudinal center line of the middle longitudinal buoyancy tank coincides with the connecting line of the center point of the coupling beam platform and the center point of the supporting cross beam; s4, launching the breeding work ship. According to the scheme, the matching performance of the inclined shipway unit and the bottom frame structure of the breeding work ship can be optimized, and the integrity of the ship body structure in the launching process is guaranteed by increasing the supporting contact area and reducing local stress concentration.

The invention belongs to the technical field of liquid carbon dioxide transport ships, and particularly relates to a novel liquid carbon dioxide transport ship adopting a fiber composite liquid cargo tank. The ship comprises a main ship body. The main ship body comprises a tail module, a cabin module, a cargo compartment module and a head module. A plurality of independent cargo compartment chambers are arranged in the cargo compartment module, and the adjacent cargo compartment chambers are separated through transverse compartment walls; an independent carbon dioxide liquid cargo tank, a top ballast tank and a bottom ballast tank are arranged in each independent cargo compartment; the carbon dioxide liquid cargo tank is made of a fiber composite material or a combination of steel and the fiber composite material and comprises an inner container and a winding layer, and the cross section of the carbon dioxide liquid cargo tank is of a bilateral symmetry polygonal structure. The carbon dioxide liquid cargo tank is connected with the hull structure through supporting blocks. The liquid carbon dioxide transport ship is high in cargo hold area capacity utilization rate, high in stability and reliability and low in capacity requirement for hoisting facilities in the construction process.

The invention belongs to the technical field of aircraft design, and discloses an amphibious aircraft water surface sliding speed reduction, turning and resistance reduction system and method.The system comprises two water baffles, and the two water baffles are arranged on the two sides of a hull structure below an aircraft waterline respectively and located between an aircraft belly fault step and a tail fault step; when the opening angle is small, the two water baffles form an air cavity at the rear portion through the ventilation effect to form the drag reduction effect, when the opening angle is large, the two water baffles reduce the exciting force caused by vortex falling, and the two water baffles are embedded in a groove of the rear fuselage when being forbidden to conform to the overall shape of the aircraft. The water baffles are innovatively arranged on the two sides of the hull structure of the seaplane, resistance or turning torque or a resistance reduction air cavity can be generated by changing the hydrodynamic shape of the seaplane when the seaplane slides on water, and the sliding process of the seaplane is controlled.

The invention relates to rare earth steel for a 355MPa-grade hull structure and a preparation method of the rare earth steel, belongs to the technical field of metal materials, and solves the problems that the existing steel for the 355MPa-grade hull structure is poor in comprehensive performance and cannot meet the service requirements of high-end ships. The steel comprises the following chemical components in percentage by weight: 0.10%-0.15% of C, 0.20%-0.50% of Si, 0.70%-1.00% of Mn, 0.03%-0.10% of V, 0.10%-0.30% of Cu, 0.04%-0.08% of Mo, 0.10%-0.20% of Cr, 0.30%-0.40% of Ni, 0.003%-0.01% of Ce, less than or equal to 0.01% of P, less than or equal to 0.01% of S, less than or equal to 0.003% of O and the balance of iron and inevitable impurities. The prepared 355MPa-grade rare earth steel for the hull structure has obdurability and corrosion resistance at the same time.

A sail propulsion system comprises, in combination: a base (300), two streamlined aerodynamic flaps (100, 200), each symmetrical with respect to a longitudinal plane and having a leading edge and a trailing edge, and extending vertically from the base, two pivoting flap links on the base, defining pivot axes (A1, A2) parallel to a main axis (A3), a common pivoting link, around the main axis, between the base and a ship structure, the pivot axes of the flaps and the pivot axis of the base being contained in the same vertical plane, a 360° motorized orientation control, capable of bringing the base and flaps into one of the following configurations: - a working configuration where the flaps have initial orientations that are close but different,with leading edges (BA) oriented in a first direction and a gap between the trailing edge (BF) of one flap and the leading edge (BA) of the second flap, - a safety configuration where both flaps are oriented in the same direction, - a space-limiting configuration where the two flaps extend head-to-tail against each other. (Fig. 5),

A modular ski tower includes a first leg member including a housing having a first end configured to be secured to a boat structure of a boat via a mounting assembly, the housing comprising a composite material and defining an interior space at least partially filled with a structural foam, and a crossmember including a housing, the crossmember comprising a composite material and defining an interior space at least partially filled with a structural foam, wherein a second end of the first leg member is coupled to a first end of the crossmember and a second end of the second leg member is coupled to a second end of the crossmember via respective slip fit couplers, and wherein the each of slip fit couplers are permanently secured via an adhesive.

The invention belongs to the technical field of ship body structures, and discloses a ship body double-layer bottom structure and an installation method thereof, in the installation process of the ship body double-layer bottom structure, when a worker assembles an inner bottom plate body, a ship outer plate, a solid rib plate and a rib, installation of a slow-installation cover plate can be delayed, and when the structure is assembled, installation of the slow-installation cover plate is facilitated. In addition, after installation of the inner bottom plate body, the ship outer plate, the solid rib plate and the ribs is completed, a worker can also firstly install other equipment in the bilge of the ship body, due to the fact that the slow installation cover plate is not installed yet, the large operation space is achieved at the moment, and after installation of the structure is completed, the worker can conveniently install the inner bottom plate body, the ship outer plate, the solid rib plate and the ribs. The buffer cover plate is installed in the containing groove and fixedly connected with the ship outer plate, the groove wall of the containing groove, the solid rib plate and the ribs at the same time, due to the fact that the surface of the buffer cover plate is flush with the surface of the inner bottom plate body, the space above the inner bottom plate cannot be occupied, and more installation space can be reserved for a liquid tank or cabin equipment.

The present invention relates to a hull condition monitoring and assessment system suitable for FPSO, belonging to the technical field of FPSO, comprising a monitoring system for collecting real-time structural strain and a real-time assessment system for assessing the safety of the FPSO, wherein the monitoring system comprises a stress sensor, a fiber optic acceleration sensor and a fiber optic Bragg grating demodulator; the real-time assessment system comprises a total longitudinal strength assessment module and a fatigue strength assessment module. The present invention obtains the total longitudinal bending stress of the hull structure and the fatigue strength stress of key structures during the offshore operation of the FPSO through the hull monitoring system, establishes a graded assessment standard for the total longitudinal safety of the hull structure through the real-time assessment system, and provides safety assessment results of the hull structure, such as the total longitudinal bending stress of the hull structure and the fatigue life of the key structures, in real time.

The utility model discloses a double-layer dissimilar metal watertight junction box. According to the utility model, the shell of the watertight junction box is arranged into two layers, the inner layer and the outer layer are electrically insulated, the local grounding end in the electronic circuit board is connected with the inner-layer box body and is connected with a ship body structure through a grounding wire on the inner-layer box body, and other signal transmission terminals and grounding terminals in the electronic circuit board are connected into a cabin through signal isolation conversion. The junction box is grounded together with the in-cabin part, so that an electric loop formed by directly connecting the junction box with a ship body is effectively avoided, potential corrosion caused by contact of dissimilar metals is avoided, and the service life of the junction box is prolonged. The device is simple in structure, low in cost and easy to implement.

The invention provides a full-rotation tug with both port mooring assistance and coastal towing, and belongs to the technical field of tugs. The ship comprises a ship body structure, the ship body structure comprises a main deck and a head lifting deck, the main deck and the head lifting deck form a connecting deck structure in the middle of the ship body structure, a towing engine is arranged at the position, close to the middle of the ship body structure, of the main deck, and two anchor winches are symmetrically arranged on the head lifting deck; a folding arm crane and a winch are arranged on the main deck located behind the towing engine, a cabin platform is arranged in the ship body structure below the main deck, a standby cable winding machine is installed on the cabin platform, and a cable hatch cover used for allowing a cable on the standby towing engine to enter and exit is arranged on the main deck. A larger coverage range is provided for tail towing, sailors can be ensured to safely engage in towing work by canceling the design of the rear lifting deck, and the cylinder hanging space required by maintenance of the medium-speed engine can be met by extending the first lifting deck.