146results about How to "Improve hydrodynamic performance" patented technology

There is provided a buoyancy system for a structure having at least one component being substantially stationary with respect to the bottom of a water covered area. The system comprises a set of buoyancy modules of engineered materials to apply an identified amount of buoyancy. The set of buoyancy modules is attached to the structure at a set of buoyancy load transfer locations. The set of buoyancy modules comprises layers of the engineered materials. The engineered materials comprise a substantially reinforced axial layer, a substantially reinforced hoop layer; and a leak prevention layer.

A submerged flow augmented shrouded turbine power generation system with a forward flow compression section (11) and an aft multi-finned diffuser section (14) with a centrally supported generator (12) powered by turbine blades (15) optimized to be driven by the enhanced flow field created by the forward cowl and aft diffuser/fin sections. The system can be positively buoyant and tethered to the seafloor (18) or negatively buoyant and tethered to the underside of a vessel or offshore structure, or it can be attached directly to the underside of a vessel or offshore structure. An array of such systems can be placed on the seafloor to create a distributed power generation network. An array of such systems can also be placed on the seafloor to directly pump seawater to an energy storage device or a central desalination plant.

The invention provides a single column maritime wind power generation device with a circumferential stabilizing column, and belongs to the technical field of ocean energy resource utilization. The single column maritime wind power generation device with the circumferential stabilizing column comprises a wind power generation set, a single column base, the circumferential stabilizing column, a supporting structure, a berthing system and a fixed ballast system; the wind power generation set is fixed on the single column base; the circumferential stabilizing column is fixed at the periphery of the single column base; both ends of the supporting structure are connected with the circumferential stabilizing column and the single column base respectively; the middle part and the bottom of the single column base are connected with the berthing system and the fixed ballast system respectively; and the berthing system is connected with the seabed. By arranging the circumferential stabilizing column, a larger waterline plane inertial moment can be obtained in a smaller waterline plane area; meanwhile, due to the low gravity center of the single column base, the stability requirement is met and the high water power performance is gained; therefore, a stable, economic and flexible floating base is provided for the wind power generation set, so the single column maritime wind power generation device with the circumferential stabilizing column is particularly applicable to deep water regions of the open sea.

A submarine with duck-type layout features that its floatage is close to and slightly greater than its gravitation to make the central point of floatage action is above its gravitational center, and 4 linked elevating rudders are arranged at both sides of submarine to make their total vertical action line coincides with the gravitation line of submarine. A method for controlling its navigation depth features used of a closed-loop negative feedback control system to control the deflection angle of 4 elevating rudders. A method for suspending it at a given position in seawater features use of at least two closed-loop negative feedback control systems for the distance and depth control to regulate the direction and speed of propeller and the deflection angle of elevating rudders. It is more suitable for robot submarine or toy.

The invention relates to a parameterized design method for a water inlet flow channel of a water jet propeller of a ship. In the method, 18 associated parameters are used for describing and constructing a three-dimensional geometric structure of a flat inlet type water inlet flow channel, wherein 3 parameters are used for constructing an integral outline of a two-dimensional structure of the flow channel; 11 parameters are used for constructing a local shape of the two-dimensional structure of the flow channel; 2 parameters are used for confirming the water inlet shape of the flow channel; and 2 parameters are used for confirming a tail oblique angle and a side oblique angle of the flow channel. Areas with complex flow, such as a junction area of the back of the flow channel and a ship hull, a lip of the flow channel, and the like are constructed by adopting a Bezier curve. The three-dimensional geometric shape of the water inlet flow channel can be flexibly controlled by adjusting the 18 parameters. The combination of the geometric parameterized modeling of the flow channel and fluid dynamic performance numerical calculation can realize the rapid design of the water inlet channel with comprehensive and optimal fluid dynamic performance. Compared with the traditional design method, the parameterized design method has short design period, low cost and good effect.

The invention discloses a DDMS heavy draught upright post platform, which belongs to the technical field of ocean engineering and ship engineering, and is applicable to oil gas drilling and producing of an abyssal sea area. The upright post platform is characterized by consisting of four heavy draught upright posts, an upright post of a center well, a heave plate, a transverse pontoon bridge, a soft cabin, an anchoring system, a riser system and a platform upper part, wherein the four heave draught upright posts are arranged on four angular points of a cross section of the platform; the upright post of the center well is arranged in the center of the cross section; a K-shaped beam is arranged on the top of a hard cabin to connect the upright posts and the center well; the heave plate and the hard cabin of the platform are directly integrated into a whole, and are horizontally arranged on the upright posts; the transverse pontoon bridge is arranged on the bottom of the hard cabin to connect each upright post; and the soft cabin in large volume is arranged on the bottom of the platform and is filled with ballast weight. The platform has the advantages that building difficulty and cost of the platform are lower; the structure of the center well makes the upright posts protected; elasticity of global design and use space of the platform upper part are larger; hydrodynamic performance can be improved, so the platform has excellent motion performance; application of a dry-type tree is supported; and the platform is applicable to various conditions of different sea areas and sea conditions.

The invention discloses an underwater towing body controlled by a front-edge-rotating cylindrical wing. Forced sinking hydrofoils of the underwater towing body adopt symmetrical airfoil profiles, andare symmetrically arranged on the two sides of the front portion of a main cavity, two rotating cylinders are symmetrically arranged at the front ends of the profile faces of the forced sinking hydrofoils relative to the main cavity, and are connected with a speed adjusting motor located inside the main cavity through rotating-cylinder rotating shafts; ducted propellers are symmetrically arrangedon the two sides of the back ends of the forced sinking hydrofoils; a transverse horizontal fixed empennage is arranged at the tai lend of the main cavity, and vertical streamlined flap type rudders are symmetrically arranged at the two ends of the transverse horizontal fixed empennage respectively; a flap is arranged at the tail end of each vertical streamlined flap type rudder, and is connectedwith a flap angle control device. According to the underwater towing body controlled by the front-edge-rotating cylindrical wing, by changing the rotating speeds and the rotating directions of the rotating cylinders at the front ends of the forced sinking hydrofoils, attack angles of the forced sinking hydrofoils can be efficiently and flexibly adjusted, and the aim of changing the motion trail ofthe vertical direction of the towing body is achieved; on this basis, the thrust directions of two-side propellers are changed through assisting, and directional floating and sinking can be achieved.

A liquid displacement system includes a storage tank, a volume of a first gas, and a volume of a second gas. The storage tank has at least one water ballast compartment to store water and at least one liquid storage compartment to store liquid and is configured symmetrically. A pump module may also be coupled to the storage tank. The pump module has at least one pair of loading pumps operating substantially at equal mass flow rate to displace the water with the liquid, and at least one pair of offloading pumps operating substantially at equal mass flow rate to displace the liquid with the water. Also, a gas valve module may be coupled to the storage tank to control pressure of the first gas and the second gas in the storage tank. The first gas is natural gas or inert gas. The second gas is natural gas.

The invention provides a twin-rudder synchronization control method of a ship, comprising the following steps of: detecting the actual deviation of rudder angles of two rudders by taking the rudder angle of one rudder as a standard; acquiring a compensating command signal of the rudder angle of the other rudder through compensation network processing by taking an actual deviation signal as an input signal of a rudder angle synchronization compensation network, and inputting the compensating command signal into a servo system of the other rudder to form closed loop feedback control. The twin-rudder synchronization control method is suitable for the navigation and attitude control of the ship with the two rudders and enhances the accuracy and the sensitivity of twin-rudder synchronization because the compensation network can correct the deviation of the rudder angels in time when the deviation is generated between the two rudder angles.

The invention discloses a three-body-combined offshore laser radar wind measuring buoyage. The three-body-combined offshore laser radar wind measuring buoyage comprises a buoy, a wind measuring laser radar, a motion sensor module, a fan assembly, storage batteries, meteorological measurement modules, a seawater measurement module and a mooring system for positioning, wherein the wind measuring laser radar, the motion sensor module, the fan assembly, the storage batteries, the meteorological measurement modules and the seawater measurement module are mounted on the buoy. The buoyage can combine the laser radar and the ocean buoy and has advantages in cost and use flexibility in a working process for finishing corresponding offshore wind profile measurement; further, the buoy adopts a three-body-combined structure, the motion response amplitude in waves is smaller, the hydrodynamic performance is excellent, the structural components are convenient and easy to dismount and assemble, the size of the buoyage is relatively small and can meet the requirement for loading into a standard container, package and transport of the whole system by the container can be realized, requirements of land transportation and sea transportation can be met, and the buoyage has the advantages of convenience, rapidness, high flexibility, high price/performance ratio and the like in an optional mode of transportation.

A hull for a boat, for example a sailboat, has a sharply angled front or bow with a curved center crest line providing a entry into the water during forward motion. Sides of the bow are concave. The main body of the hull is shaped as a semicircle in transverse cross section. The upper edge of the hull has a flare that extends laterally outward to form wings along both sides of the hull. The wings begin adjacent the front or bow and gradually increase in the extent of their lateral extension at a mid-position the hull and adjacent the stern. The stern has an angled end extending rearward at the bottom of the hull. A step is provided at the stern. The deck extends from the upper edge of the hull to the edges of the cockpit. The cockpit has curved inside surfaces and a center beam extending along the center of the boat, the center beam having sloping surfaces. An open transom permits water to flow from the cockpit.

The invention relates to the technical field of blade shaping, in particular to a blade, a shaping method thereof and a turbine. The blade comprises blade profile segments at different radius positions. All the blade profile segments are connected in series along a stacking line according to the radius positions. The stacking line penetrates through centers of gravity of all the blade profile segments. The stacking line comprises n bend segments which are connected in series. Each bend segment comprises a first bend and a second bend which are connected in series. Bending directions of the first bends and the second bends are opposite, and n is larger than or equal to 1. Bending directions of two bends connected between every two adjacent bend segments are opposite. According to the bladeand the shaping method thereof, the stacking line is designed to be series-connection of multiple bend segments; each bend segment is connected in series, and a fluctuant structure is formed; multiplefluctuations are formed in the whole stacking line; and a concave-convex structure is naturally constructed in the front edge of the blade acquired after the blade profile segments are stacked alongthe stacking line. According to the blade and the shaping method thereof, under the premise that the blade profile of the blade is not changed, fluctuation of the stacking line is utilized to construct the concave-convex structure of the front edge of the blade; and the good hydrodynamic property of the blade under a big angle of attack is improved.

A tension leg platform that is stable with a quayside-integrated deck without the use of temporary stability modules or specialized installation techniques. The hull preferably consists of four radially-oriented vertical corner columns connected with four central ring pontoon segments. The vertical columns are fixed to the outer periphery of the central pontoon. The columns are characterized by a major radial axis and a minor transverse axis. The mooring system includes tendons supported at tendon porches directly at the four column outboard lower corners, without additional radially-extending tendon support structures.

The invention discloses a tension leg platform capable of being provided with wide pontoons, for short, WTLP. The tension leg platform capable of being provided with the wide pontoons comprises an upper module, lower floating bodies, tension leg systems and bottom foundations. Stand columns are arranged on the lower side of the upper module and support the upper module. A plurality of tension legs are arranged on bottom corners of the lower floating bodies to be connected with the bottom foundations, and the tension legs provide downward pull force for the platform to fix the platform. According to the WTLP, since square-to-circular transitional section connecting structures are arranged between the round stand columns and the square pontoons, the pontoons can be designed wider to increase bottom buoyancy and improve self-floating stability on the basis of adopting the round stand columns to guarantee the in-place performance of the platform, the upper module and the lower floating bodies can be integrally built in wharfs and building sites where the fairway depths are limited, and a wet-dragging transporting mode can be adopted; and meanwhile, the design of the wide pontoons enables the pontoons to be thinner, and thus current loads borne by the platform when the platform is in place can be decreased advantageously, and the in-place performance of the TLP is improved.

The invention discloses a ship type optimization method based on a multi-objective particle swarm optimization algorithm. The method comprises the following steps: generating a group of particle swarmdesign variables according to the multi-objective particle swarm optimization algorithm, wherein each design variable particle corresponds to a group of ship type modification parameters; establishing a ship body new geometry corresponding to the ship type modification parameter by adopting an arbitrary curved surface deformation technology; calculating hydrodynamic performance by adopting a deepbelief network algorithm; and inputting a target function into the multi-objective particle swarm algorithm, generating a group of new particle swarm design variables according to the transformationrule of the multi-objective particle swarm algorithm, returning to step 2 to continue the next optimization until the multi-objective particle swarm algorithm reaches the maximum iteration times, andoutputting the hull geometry corresponding to the optimal particle. The hydrodynamic performance of the ship in waves is predicted by adopting a deep belief network algorithm, and global optimizationis performed by adopting the multi-objective particle swarm algorithm, so that the accuracy and the practicability of ship type design are ensured while the ship type optimization efficiency can be effectively improved.

The invention discloses a resin-based nano composite material, a preparation method and a method for deeply removing copper- citric acid from water, and belongs to the technical field of wastewater treatment. A matrix of the composite material is a macroporous D301 weakly basic ion exchange resin, and nano hydrated zirconia particles are uniformly distributed in pores. The method for the treatmentof wastewater comprises the following steps: (1) filtering Cu-citric acid wastewater, and adjusting the pH value of filtrate; (2) enabling the filtrate to pass through an adsorption tower filled withthe resin-based nano composite material; (3) stopping adsorption when the concentration of copper in effluent reaches a breakthrough point, and desorbing and regenerating the resin-based nano composite material; and (4) after the composite material is cleaned to neutral, transforming the composite material for cyclic use. The invention combines a preconcentration effect of a polymer matrix with the performance of nano hydrated zirconia for selectively removing heavy metal complexes from the water, so that the adsorption capacity and the selectivity of the material for the heavy metal complexes are effectively improved, and the concentration of the heavy metals in the effluent is stable and meets the discharging standard.

The invention discloses an ultra-large type multi-floating-body semi-submersible floating platform. The ultra-large type multi-floating-body semi-submersible floating platform comprises an integrated upper housing located above the water surface, an upper-layer building constructed on the upper housing by using the housing as a base body, multiple lower floating bodies partially suspended or floating in water and connected with the upper housing through multiple columns, multiple columns connected with the upper housing and the lower floating bodies respectively and independent mutually and a plurality of supporting rods arranged among the columns corresponding to a part of or all of the lower floating bodies respectively, whereinthe lower floating bodies are parallelly arranged in the width direction of the platform, the corresponding columns are connected in the width direction of the platform to form a whole structure through the supporting rods. The ultra-large type multi-floating-body semi-submersible floating platform combines the advantages of box-type and semi-submersible typefloating platforms and has the advantages of being ultra-large in span, small in size and self weight, small in wavy effect, safe in stormy waves and the like while the problem of overlarge stress at connecting parts is effectively solved.

The invention relates to a method for preparing an artificial squid reef, which comprises the following steps of: (a) constructing an upright post of the artificial squid reef, and connecting a fixing ring on the upright post; (b) fixing a fishing net on the upright post and the fixing ring; (c) fixing an artificial attaching device on the fishing net and the fixing ring; and (d) coating anticorrosion coatings on the surface of the artificial squid reef to finish the preparation. The invention also provides an artificial squid reef. The invention has the advantages that: the method for preparing the artificial squid reef is simple, and the prepared artificial squid reef is simple in structure and convenient to use; ground pins are arranged for a cylindrical artificial squid reef, and the stability and water dynamic property of the artificial squid reef can be effectively improved; and the prepared artificial squid reef can be used as an independent reef or a reef group, can provide a place for squids and other fishes to lay eggs, and solves the egg laying problem of the fishes.