803results about "Watercraft hull design" patented technology

The invention relates to the technical field of ships, in particular to a stern-direction icebreaking structure and a ship, the stern-direction icebreaking structure comprises two ice pressing appendages, the two ice pressing appendages are oppositely arranged in a spaced mode, the ice pressing appendages are fixedly arranged at the lower end of the stern, and inclined ice pressing structures are formed on the sides, away from the bow, of the ice pressing appendages; the inclined ice pressing structure is inclined downwards in the direction from the stern to the bow; the two rudder blades and the two ice pressing appendages are arranged in a one-to-one correspondence mode, and the rudder blades are rotationally arranged on the lower end faces of the ice pressing appendages. According to the invention, the stern sailing icebreaking capability of the ship can be obviously improved, and the power can be reduced.

The invention discloses a functional gradient buffer structure suitable for a high-speed water entry process of a cross-medium navigation body, and aims to effectively improve the structural safety and integrity of the navigation body when the navigation body bears a high impact load. The structure mainly comprises a pointed arch-cylinder combined housing, a functional gradient buffer layer and a locking device. Wherein the functional gradient buffer layer is formed by sequentially and tightly attaching high-density (200kg / m < 3 >) rigid polyurethane foam, medium-density (100kg / m < 3 >) rigid polyurethane foam and low-density (50kg / m < 3 >) rigid polyurethane foam, a filling structure with gradually-decreased density is formed in the axial direction, the functional gradient buffer layer is arranged in a cavity between the housing and the navigation body, and the low-density layer is close to the head of the navigation body. The locking device achieves axial limiting and anti-falling fixing of the housing through an annular structure. Under the condition of 100 m / s vertical entry water impact, numerical simulation analysis shows that the structure can reduce the peak value of the impact load coefficient borne by the navigation body to 0.88, and compared with a single-layer buffer structure with the same volume density (100 kg / m < 3 >), the impact load coefficient of the structure is reduced by 27.3%.

Disclosed is a method of reducing drag on the hull of the vessel by creating a Coanda flow on the hull by jetting a fluid onto the hull or surface continuous with hull. The fluid is jetted onto the hull or surface continuous with the hull at a location above or below the waterline of the vessel. The fluid is jetted from within a habitat positioned at least partially below the waterline, the habitat being vented to atmosphere. The habitat has an open end below the waterline. The Coanda flow extends entrains air below the waterline and adjacent to the hull. An air cavity or sheet is created by the jetted fluid. A system for reducing drag is also disclosed.

The invention relates to the technical field of ship construction, in particular to a ship superstructure combined type bulkhead structure and a manufacturing method. By combining the straight bulkhead and the groove-shaped bulkhead, on one hand, the groove-shaped joints on the groove-shaped bulkhead can reduce welding heat input deformation, reduce the original construction object quantity and the structural light weight, and ensure the rigidity of the bulkhead structure in the height direction; and on the other hand, the outfitting open hole is formed in the flat and straight bulkhead, so that the opening precision of the outfitting open hole is conveniently controlled, and effective connection of the penetration piece and the bulkhead structure is realized. And meanwhile, the stiffener is arranged, so that the bulkhead structure is reinforced in the through direction of the outfitting opening. The center line and the folding line of the groove-shaped node are surveyed on the wall plate of the combined type bulkhead structure in advance, so that the subsequent precision inspection of the combined type bulkhead structure is facilitated, the operation is simpler, and the inspection result is clear at a glance.

A system and method for enhancing marine vessel efficiency through integrated hull optimizations is disclosed. The system includes automated bow thruster covers that reduce hull drag and condition water flow, coupled with strategically positioned air lubrication nozzles that create and maintain an air layer under the vessel. The bow thruster covers may be configured as circular doors or parallel panels, optionally incorporating air discharge ports or working in conjunction with dedicated air jets. An intelligent control system optimizes the integrated components using real-time sensor data and computational fluid dynamic analysis. The system modulates air distribution and cover positions based on sea conditions and vessel speed, maintaining optimal efficiency during operation. External surfaces may incorporate superaerophilic structures to enhance air retention and reduce drag. The comprehensive integration of these components provides improved hydrodynamic efficiency while maintaining full bow thruster functionality when required.

The utility model provides a rescue boat deck supporting structure and ship, the rescue boat deck supporting structure comprises a rescue boat deck, a main deck and a supporting structure, the supporting structure comprises a longitudinal supporting member and a quadrilateral box body structure, the quadrilateral box body structure is located between the main deck and the rescue boat deck, two ends of the quadrilateral box body structure are respectively welded with the main deck and the rescue boat deck; boat facility stand columns are arranged on the rescue boat deck, the area of the end face of the end, connected with the rescue boat deck, of the quadrilateral box structure is not smaller than that of the end face, connected with the rescue boat deck, of the boat facility stand columns, and the area of the end face, connected with the main deck, of the quadrilateral box structure is larger than that of the end face, connected with the rescue boat deck, of the quadrilateral box structure. The ship comprises the rescue boat deck supporting structure. The quadrilateral box body structure is additionally arranged in the supporting structure, so that the rigidity and the strength of the supporting structure in the length direction and the width direction of the ship are improved, and the supporting force of the supporting structure is improved.

The present invention discloses an adjustable stern wave suppression plate structure, which relates to the technical field of wave suppression plates; it includes wave suppression mounting parts, and there are two wave suppression mounting parts, and the structures on the two wave suppression mounting parts are the same; a one-way moving part is installed on the wave suppression mounting part, and the one-way moving part is used for one-way movement; a cleaning and fitting part is installed on the wave suppression mounting part; the cleaning and fitting part is used for fitting the one-way moving part; a balance control part can be used to detect the balance state of two extrusion air cushions. By detecting the air pressure, the skew attitude of the ship can be reflected. When one side of the ship is skewed downward, the pressing plate on the other side can be directly controlled to turn up. By turning up the pressing plate on the other side, under the action of water flow, the ship can be pressed downward; to solve the problems that the current stern wave suppression plate structure is not convenient for automatically adjusting the ship attitude and not convenient for automatically keeping the wave suppression plate clean during berthing or navigation.

An aerator module (3) is intended for attachment to a ship (1) and comprises a housing (12) with at least one air supply opening (10) and with at least one air discharge opening (18) and a membrane film (19) which is arranged at the air discharge opening (18) and fastened to the housing (12).

According to the ultra-efficient energy-saving method and device for automobiles, ships, trains, submarines and aircrafts, when the automobiles and the ships advance, the heads push air to scatter all around, and negative pressure areas are formed on the bodies and the tails of the automobiles and the ships to suck and pull the automobiles and the ships. A rear flow cover 2 is additionally arranged at the head of the vehicle and vessel, scattered air is forced to leave the rear flow cover in an accelerated mode in the direction opposite to the advancing direction of the vehicle and vessel and flow towards the side and the tail of the vehicle and vessel, power (reverse thrust) is provided for the vehicle and vessel, air in a negative pressure area of the side and the tail of the vehicle and vessel is supplemented, the speed of airflow leaving the rear flow cover relative to the ground is reduced, and energy loss is reduced. A water baffle 4 is arranged on the bow, and the bottom edge of the water baffle is connected with a water pressing plate 5, so that the water pressure of the raised water level pushes the boat to advance. The water pressing plate is located on a static horizontal plane, so that the ship does not easily shovel water when advancing. The two sides of the ship are respectively provided with a manger board 1, so that waves generated by the ship surge towards the tail of the ship to reversely push the ship to advance. The air bag is arranged at the tail of the vehicle, high-pressure air generated by the windward side of the head of the vehicle is conveyed to the air bag, the air bag is prone to deformation and automatically searches for a large-negative-pressure position to fill a negative-pressure area, resistance is reduced, and safety is achieved.

A ventilation drag reduction device includes a main housing, a first rectification assembly, a second rectification assembly, and a flow isolating assembly; the main housing is composed of a first segment, a second segment, a third segment, and a fourth segment; the first rectification assembly is composed of first rectification plates; the second rectification assembly is composed of at least one second rectification plate; the flow isolating assembly is arranged in a cavity of the third segment; the fourth segment is configured as an outlet end. On the premise that the total construction cost is not obviously increased, high-pressure gas is rectified in a cavity of the main housing, so that the turbidity of the high-pressure gas is reduced, and a stable insulating gas layer is formed at the bottom of a hull; in addition, the present invention further discloses a marine ventilation drag reduction system.

The utility model discloses a deepwater lifting pipe-laying ship for a 3000-meter-water-depth double-pipe-laying system, a main ship body of the deepwater lifting pipe-laying ship is arranged to be of a three-layer continuous deck structure, and a bottom layer is a double-bottom layer and is used for arranging marine equipment; the middle layer is a freeboard deck and is used for arranging an S-Lay pipe laying area; the upper layer is a main deck and is used for arranging a J-Lay pipe laying area and a pipe stacking area; a full-rotation crane is arranged at the stern part of the main ship body; a moon pool is arranged in the middle of the main ship body, and a J-Lay tower is arranged on the upper portion of the moon pool. A living building and a helicopter platform are arranged at the bow part of the main hull; a plurality of full-revolving propellers, a plurality of telescopic propellers and a plurality of side propellers are arranged on the outer side face of the bottom of the main ship body. The deepwater lifting platform can continuously work at the water depth of 3000 meters, and is provided with an S-Lay pipe laying system and a J-Lay pipe laying system.

The present invention provides a vehicle buoyancy-aiding and drag-reducing inflatable film material and a manufacturing method thereof. The inflatable film material adopts a three-layer composite structure and is composed of an outer abrasion-resistant layer, an intermediate reinforcing layer, and an inner contact layer. Among them, the outer abrasion-resistant layer is made of cis-butadiene rubber, the intermediate reinforcing layer is formed by braiding and winding high-strength carbon fiber strands, the inner contact layer is made of nitrile rubber, and epoxy resin is used for bonding between the intermediate reinforcing layer and the outer abrasion-resistant layer and the inner contact layer. The above-mentioned inflatable film material is prepared by the soft-core method. The present invention can greatly improve the bursting strength of the film material and solve the technical problem of the failure of the inflatable film structure caused by the wave impact load approaching the inflation pressure of the inflatable film material under high-speed and high-sea conditions. It can also maintain the characteristic of low linear density of the film material, effectively cope with the high-speed and high-sea environment, provide material guarantee for realizing the hydrodynamic modification of the vehicle body by replacing the rigid deformation of traditional metal materials with the flexible deformation of inflatable film materials, save power energy, and relieve the pressure of logistics support.

An adjustable surf wake system enhances a wake formed by a watercraft travelling through water. The system may include a flap for deflecting water traveling past the stern of the watercraft, and / or a positioner operably connected to the flap for positioning the flap relative to a longitudinal axis of the watercraft between a neutral position and an outward position. Positioning a port flap in its extended position enhances a starboard surf wake, and positioning the starboard flap in its extended position enhances a port surf wake. A wake modifying system for modifying a wake produced by a watercraft traveling through water may include a rudder pivotally mounted to the watercraft for steering the watercraft, a fin pivotally mounted to the watercraft substantially along a centerline of the watercraft and forward the rudder, wherein the fin pivots about an upright axis to modify the wake produced by the watercraft traveling through the water, an actuator mounted within the watercraft and operably coupled to the fin for pivoting the fin relative to the centerline, and a controller mounted on the watercraft allowing an operator to control the actuator and selectively pivot the fin to a desired angle θd relative to the centerline.

The invention belongs to the technical field of ship equipment, and discloses a wave suppression device and a ship. The wave suppression device comprises a hinge four-bar mechanism, a spoiler sheet and a rotary driving part, and the rotary driving part drives the spoiler sheet to rotate through the hinge four-bar mechanism, so that the spoiler sheet has a working position extending into water. The rotary driving part is arranged above the water surface, and the sealing surface of the rotary driving part is separated from the seawater environment, so that the possibility that marine organisms are attached to the sealing surface of the rotary driving part is fundamentally avoided, and the maintenance frequency and the environmental protection risk are remarkably reduced. Besides, the rotary driving part is far away from a seawater corrosion environment and does not need to bear underwater pressure, so that the failure probability of the sealing part caused by seawater corrosion or mechanical shock is reduced, the working stability of the driving system is improved, and the service life of the driving system is prolonged.

The hydrofoil ship comprises a ship body, air propellers are arranged on the outer walls of the two sides of the stern end of the ship body, a mounting cylinder is connected to the center of the stern end of the ship body, and a supporting column is embedded in the inner wall of the bottom of the mounting cylinder; one side of the bottom end of the supporting column is connected with a first hydrofoil through a rotary joint, limiting blocks are connected to the outer walls of the two sides of the supporting column, a connecting rod is arranged in the middle of one side of the supporting column in a penetrating mode, and the bottom end of the connecting rod penetrates through the supporting column to be connected with the first hydrofoil through a movable joint; a driving mechanism is arranged on one side of the interior of the mounting cylinder; according to the hydrofoil ship, a wind power propelling mode is adopted, a structure entering water does not need to be additionally arranged, advancing of the ship is more stable, the connecting rod is pulled through the driving mechanism to change the attack angle of the first hydrofoil, and the hydrofoil ship keeps a stable navigation posture under different sea conditions.

The invention discloses a marine floating deck structure, and relates to the technical field of floating decks, the marine floating deck structure comprises a first deck main body and a second deck main body, mounting blocks are fixedly mounted on one side of the first deck main body and one side of the second deck main body, and two symmetrically distributed mounting grooves are formed in the bottoms of the two mounting blocks; mounting shells are fixedly connected to one side of the first deck main body and one side of the second deck main body, and transmission shells are fixedly mounted at the tops of the two mounting shells. Through the arrangement of the structure, the first deck body and the second deck body can be spliced and fixed, the loading area is enlarged, the loading efficiency is improved, the overall strength and stability of the deck are enhanced, a ship can meet the loading requirements of more types and numbers of wheeled vehicles, and the ship is more convenient to use. And meanwhile, the flexibility and practicability of the deck are kept, the water flow impact resistance can be reduced, and the use of a user is facilitated.

The invention belongs to the technical field of ocean engineering drag reduction, and relates to a self-adaptive chemical gas production underwater drag reduction layer and a preparation method thereof.The surface of an aircraft is regarded as a gas production place and transformed into an intelligent interface with sensing and feedback capabilities, inert gas generated by reaction of reactants is detained and utilized in situ through microstructure design, and the self-adaptive chemical gas production underwater drag reduction layer is obtained. The independent micro chamber structure avoids diffusion of local failure, the macroscopic flow guide structure relieves the problem of non-uniform gas film distribution, external energy input is not needed, the chemical reaction rate is reversely and adaptively regulated and controlled based on the physical effect generated by gas retention, and therefore a closed-loop passive self-adaptive resistance reduction film layer is formed. Reaction byproducts are environment-friendly water-soluble sodium chloride and water and are removed in a pulse type reaction mode of high-speed water flow scouring and gas retention, so that the risk of permanent blockage is reduced, safety and environment friendliness are achieved, the energy utilization efficiency is high, meaningless waste of gas is avoided, and the cruising ability of fuel is equivalently and greatly improved.

The utility model discloses a multifunctional deck transport ship which comprises a main ship body and a dynamic positioning DP2 system, the main ship body is provided with a sinking mooring area, and the main ship body comprises a double-layer bottom deck, a middle deck, a main deck and a forecastle A deck. The dynamic positioning DP2 system comprises a bow thruster arranged on the bow portion of the ship and a pod thruster arranged on the stern portion of the ship. The multifunctional deck transport ship has the advantages of being high in maneuverability, high in maneuverability, longer in all-pass deck, wider in cargo transfer and loading and unloading operation range, higher in efficiency and high in safety.

The invention relates to the technical field of ship automatic control, and particularly discloses a self-adaptive adjusting system and method for a ship ballast water tank, and the system comprises a plurality of water level sensors, an attitude sensing module, a central controller and an execution mechanism which are installed in a distributed manner. And the central controller receives and fuses the multi-source sensing data by executing a stored computer program so as to solve real-time attitude parameters of the ship, compares the real-time attitude parameters with preset target attitude parameters, and generates a control instruction through an optimal distribution algorithm based on deviation. And the executing mechanism adjusts the water volume of each ballast water tank according to the instruction, so that the accurate control on the ship attitude is realized. By means of multi-source data fusion and intelligent optimization decision making, the problems that a traditional ballast water system is lagged in response and inaccurate in regulation and control are solved, and the safety and stability of a ship in the loading and unloading operation process are remarkably improved.

A gas-layer drag reduction system applied to a large ship, and a ship. The gas-layer drag reduction system (100) comprises: a gas supply system (200), a pressure stabilizing system (300), a gas injection system (400), a monitoring system (500), and an intelligent management system (600), wherein the gas injection system (400) is configured to inject a gas into water by means of the bottom of a ship and form a stable gas layer at the bottom of the ship; the monitoring system (500) is configured to monitor operation information, gas state information, navigation environment information, ship state information and gas-layer state information of the gas-layer drag reduction system (100); the intelligent management system (600) is configured to receive feedback signals of the gas supply system (200), the pressure stabilizing system (300), the gas injection system (400) and the monitoring system (500), and send control signals to the gas supply system (200), the pressure stabilizing system (300), the gas injection system (400) and the monitoring system (500); and the intelligent management system (600) is also configured to control the gas-layer drag reduction system (100) to perform signal interaction with a ship system (110), so as to implement intelligent control. Therefore, the gas-layer drag reduction system (100) is suitable for large ships.

The present invention discloses a self-cleaning active drag reducer and its preparation method, belonging to the technical field of oilfield chemistry. The drag reducer is made of the following components by mass concentration: 30-50% of a composite copolymer, 1-15% of a desorption promoter, 0.02-0.4% of a main suspension agent, 0.15-0.6% of a suspension activator, and the rest is a solvent; Preparation of the composite copolymer: First, dissolve polyvinyl alcohol and carboxymethyl hydroxypropyl guanidine gum in water to form an aqueous solution, add acrylamide, sodium acrylate, a benzene ring-containing rigid monomer, a reinforcing agent, and urea to the aqueous solution to obtain a composite reaction solution; Then add an initiator to carry out a polymerization reaction to obtain a polymer colloid; Cut, crush, and dry the polymer colloid to obtain a composite copolymer powder. The drag reducer of the present invention has both a thickening effect. On the basis of having variable viscosity and strong sand-carrying ability, it strengthens the characteristics of low adsorption and low residue of the polymer. At the same time, it also has the function of promoting the dissociation of adsorbed gas into free gas and dredging and cleaning the formation, effectively improving the oil and gas recovery rate and stable production capacity.

The invention relates to the technical field of marine equipment, and particularly discloses a ship fin stabilizer which integrates bionic resistance reduction, intelligent control and energy recovery functions. The fins are of a layered structure of a flexible silica gel skin and a shape memory alloy wire mesh, V-shaped groove arrays are arranged on the surfaces of the fins, and the fins can be self-adaptively deformed into a U shape to reduce resistance. The driving mechanism realizes high-frequency compensation through cooperation of a hydraulic cylinder and piezoelectric ceramics; the energy recovery module converts mechanical energy into electric energy through a two-way pump-generator. According to the device, the rolling trend is predicted through the LSTM neural network, a Q-learning optimization control strategy is combined, the stabilization efficiency and energy efficiency are remarkably improved, and the device is suitable for stable control of ships under high navigational speed and complex sea conditions.

The differential pressure driven propeller micro-nano air curtain noise reduction system comprises a gas-liquid mixing cavity and a high-speed stirrer, and the gas-liquid mixing cavity is arranged in the internal space of the tail of an aircraft; the high-speed stirrer is arranged in the gas-liquid mixing cavity; the gas-liquid mixing cavity is provided with a gas inlet, a water inlet and a micro-nano bubble outlet, the diameter of the water inlet is D1, and the diameter of the micro-nano bubble outlet is D2; the included angle between the tangent line of the molded line at the micro-nano bubble outlet and the central axis of the aircraft is alpha, and the angle between the micro-nano bubble outlet and the central axis of the aircraft is-alpha; the center-to-center distance between the water inlet and the micro-nano bubble outlet is D3, and D3 is larger than 6 * D1 and larger than 3 * D2; when the spraying speed V3 of the micro-nano bubbles is equal to V / cos alpha, the micro-nano bubbles enter a potential flow area and spread downstream along the streamline of the aircraft, and a micro-nano air curtain is formed and wraps the periphery of the propeller. A micro-nano air curtain is formed around the propeller, acoustic impedance is increased to cause acoustic wave transmission loss, and the radiation noise of the propeller is reduced.

The invention discloses a flow guide structure capable of reducing a deep-sea mining plume winching effect. The mine collector tail guide plate is mounted at the tail of the mine collector and used for guiding water flow to intersect with sediment plume, dissipating turbulent flow kinetic energy and reducing the winding effect. And the guide plate steering device is connected with the guide plate at the tail part of the ore collector and is used for adjusting the direction of the guide plate to adapt to different advancing working conditions of the mining vehicle. And the side guide plates are mounted on the two sides of the mining vehicle and used for guiding water flow to form trailing vortexes, the trailing vortexes intersect with sediment plume, turbulent kinetic energy of the sediment plume is dissipated, and the winding effect is reduced. The flow guide structure effectively reduces the entrainment dust raising effect on sediment on the surface layer of a seabed in the deep-sea mining process by optimizing the interaction between water flow and sediment plume.

The utility model belongs to the technical field of ship resistance reduction devices, and discloses a bubble resistance reduction device and a ship. The bubble drag reduction device comprises a gas generator, a bubble generator and a bubble breaker. The gas generator can generate compressed gas. The bubble generator is installed at the bottom of the ship and communicates with the gas generator, and compressed gas generates first bubbles through the bubble generator to be discharged. And the bubble breaker is positioned at the downstream of the bubble generator and is communicated with the bubble generator. The bubble breaker has an open state and a closed state, when the bubble breaker is in the open state, the first bubbles are broken into second bubbles through the bubble breaker, and the second bubbles flow into the bottom of the ship; when the bubble breaker is in a closed state, the first bubbles are directly discharged and flow into the bottom of the ship, the universality is high, and the drag reduction effect is good; structural operation is simple, and cost is low. The ship comprises a ship body and the bubble drag reduction device, and the bubble drag reduction device is located at the bottom of the ship body, so that the ship is high in overall operation efficiency and low in cost.

The invention provides an object surface microstructure and bubble composite resistance reduction measurement experimental device based on Taylor-Couette flow, and relates to the technical field of Taylor-Couette flow resistance reduction measurement. Comprising a rack supporting column, a rack supporting plate, a motor, an upper coupler, a torque sensor, an inner driving shaft, a lower coupler, a mechanical seal, an upper end sealing connecting piece, an inner rotor, an outer rotor, a lower end sealing connecting piece, a supporting column, a rack base, a one-way vent valve and a chassis. According to the invention, convenient replacement of different inner rotors with surface microstructures, smooth surfaces and the like can be realized according to experimental requirements; the switching between two ventilation modes of outward ventilation inside the inner rotor and vertical upward ventilation at the bottom of the inner rotor can be realized; flow control under different rotating speeds and gas flows can be realized through the gas flow meter and the motor controller; resistance borne by the inner rotor under different flow working conditions can be measured in real time through the torque sensor, and therefore research on the surface microstructure and bubble composite resistance reduction characteristic under Taylor-Couette flow is achieved.

The application discloses a T-shaped deep-well type reversible streamlined fin and a use method thereof, and belongs to the technical field of ship equipment, which comprises a deep well in a T-shaped structure, a space for accommodating a reversible fin is arranged in the deep well, a fixed pulley for guiding a hook cable is arranged on the inner side wall of the deep well through a support, the reversible fin is arranged at the bottom of the deep well, the reversible fin is divided into a left fin and a right fin, and the left fin and the right fin are driven to be reversed through a rotating shaft driving mechanism.The T-shaped deep-well type reversible streamlined fin and the use method thereof effectively reduce water flow resistance through the streamlined design of the reversible fin, break through the turbulent layer of the bottom of the ship, and reduce the interference of water flow on scientific exploration equipment; in the maintenance operation state, the T-shaped structure of the deep well provides a spacious and convenient operation space for the workers; the hook cable and other devices are used for fixing the position of the fin and connecting the operation personnel to install the support device in the maintenance process, and assist in hoisting the equipment when the equipment is replaced.

The invention relates to the technical field of ducted propeller devices, and discloses a water-air integrated propelling device and a cross-medium aircraft, the water-air integrated propelling device comprises a shell, the shell is provided with a main channel, a lifting channel, an air inlet channel and a water inlet channel, the lifting channel, the air inlet channel and the water inlet channel are communicated with the main channel, and the main channel and the air inlet channel are coaxially located on the same plane; the lifting channel and the water inlet channel are located below the main channel, and the air inlet channel and the water inlet channel can be closed; the power device is slidably connected with the shell, and the power device can be switched between the main channel and the exterior of the shell through the lifting channel; according to the cross-medium aircraft, the working state can be rapidly switched according to task requirements, the cruising ability of the cross-medium aircraft in different medium environments is improved to the maximum extent, and the practicability and performance of the cross-medium aircraft in diversified application scenes are enhanced.

The application discloses a solid droplet-based drag reduction ball preparation and testing method, and relates to the underwater drag reduction technical field.The preparation method comprises the following steps: performing decontamination treatment on the surface of a steel ball, configuring a PDMS solution and pouring the PDMS solution into a polytetrafluoroethylene mold with small holes with different curvature radii, performing vacuum degassing and solidification, and then peeling off to obtain solid droplet structures with different curvature radii, and bonding the solid droplet structures to the bottom of the steel ball.Through the regulation and control of the solid droplet curvature radius (2.5-10.8 mm) and the water entry speed, the high-speed camera technology is used to observe the change law of the sputtering crown formation, air entrainment and air cavity closure mode in the water entry process, the quantitative analysis of the underwater air cavity volume and the drag coefficient is combined, and the influence of the solid droplet curvature radius on the air cavity shape and the drag reduction performance is verified.The solid droplet structure optimizes the air film capture efficiency, significantly reduces the blunt body pressure difference resistance and the friction resistance, and the preparation process is simple, stable and suitable for the development of the underwater vehicle drag reduction technology.

A pressure stabilizing cavity unit installation tool is provided with a vertically-arranged jig frame plate and a clamp, a long-strip-shaped hole is formed in the top of the jig frame plate and is vertically arranged, a first opening is formed in one side of the long-strip-shaped hole, a second opening is formed in the other side of the long-strip-shaped hole, the top of the long-strip-shaped hole is communicated with the first opening and the second opening, and the depth of the second opening is larger than that of the first opening. An iron wedge is placed in the second opening, the shape of the bottom of the iron wedge is matched with that of the bottom of the second opening, the two pressure stabilizing cavity units are inserted into the long-strip-shaped hole in a back-to-back butt joint mode, and pressure stabilizing cavities of the pressure stabilizing cavity units are arranged in the first opening and the second opening in a sitting mode; the jig frame plates and the clamps are used in cooperation, the clamps are fixed to the tops of the pressure stabilizing cavity units, the clamps are in a concave shape, and the concave clamps are clamped on ship outer plates arranged on the pressure stabilizing cavity units. The outer plate can be prevented from generating large deformation in the welding process, the welding quality of argon arc welding is guaranteed, the welding efficiency is improved, the overall construction period is shortened to the maximum extent, and the construction quality is improved.