33results about How to "Improve stealth performance" patented technology

The invention discloses a multi-spectral-band compatible stealth coating based on a high-entropy alloy and a preparation method of the multi-spectral-band compatible stealth coating, and belongs to the technical field of functional high-entropy alloy coatings and preparation of the functional high-entropy alloy coatings. The problem that the visible light and infrared stealth effect of an existing stealth coating in a wide spectrum range is poor is solved. According to the preparation method, the high-entropy alloy film is prepared through the magnetron sputtering technology, efficient customization of material components and structures is achieved through scientific screening and optimal combination of elements and regulation and control of magnetron sputtering parameters, and therefore the high-entropy alloy film which is uniform, compact and excellent in performance is obtained. Test results show that the visible light band absorptivity of the high-entropy alloy coating is about 0.95, the infrared band emissivity of the high-entropy alloy coating is about 0.05, and multi-spectrum-band compatible stealth in the visible light and infrared spectrum range is achieved.

The invention discloses a metasurface structure for reducing normal incident scattering of an antenna, and the metasurface structure employs a double-layer design, combines an absorption layer and a frequency selection surface layer, and achieves broadband absorption through a periodically two-dimensional unfolded microstrip patch unit and a three-layer resistor loading metal ring. Ansys electromagnetic field simulation software verifies that the structure effectively reduces the radar cross section of the microstrip antenna within the frequency band of 3-10 GHz, and ensures the normal work of the antenna at the same time. Through deep analysis and simulation optimization, key factors influencing the performance are determined, and the balance between the wave permeability and the wave absorbing property is realized. Besides, an adjustable resistance circuit, a reconfigurable mechanism, an intelligent algorithm and a sensor technology are integrated, the stability and the automation level of the antenna performance are further improved, and an effective solution is provided for improving the scattering reduction effect during forward incidence of radar waves.

The utility model belongs to the technical field of ships, and discloses a base, a ceiling lamp and a ship. The base is installed in an installation hole of a cabin roof structure of a ship, and the two opposite sides of the cabin roof structure are the invisible installation side and the illumination side respectively. The base comprises a base bottom structure, a liner structure, a transition structure and a ceiling lamp base structure. The gasket structure is of an annular structure and is connected to the invisible installation side, and the base bottom structure is connected to the gasket structure. The transition structure is located in the mounting hole, connected to the base bottom structure and extends towards the lighting side. The ceiling lamp base structure is connected to the side, away from the base bottom structure, of the transition structure. According to the base, the thickness of the bulged part of the ceiling lamp relative to the ceiling structure can be reduced, and the hiding effect of the ceiling lamp is improved.

This invention discloses an integrated S-curve nozzle design method and nozzle for aircraft with a blended wing-body layout, belonging to the field of aero-engines. The method comprises the following steps: obtaining the external surface of the blended wing-body aircraft and the position and size parameters of the engine exit; establishing a model of the S-curve section of the nozzle; obtaining and modifying the upper expansion surface at the nozzle exit; designing the centerline of the nozzle's aft deck using Lee curves; designing the double sidewalls of the nozzle's aft deck using Lee curves; obtaining the aft deck profile of the nozzle based on the centerline and double sidewalls determined in steps 3 and 4; and obtaining the sidewall profile of the nozzle exit. This invention solves the problems of limited space layout, large drop between the nozzle exit and the aircraft's tail edge, and maintaining the streamline of the aircraft's external surface after nozzle installation when designing an integrated S-curve nozzle in a blended wing-body layout.

The embodiment of the present disclosure discloses a flexible combined multifunctional broadband metasurface antenna for synthetic aperture radar, which comprises, from inside to outside, a core metasurface antenna located at the center and a peripheral metasurface located at the periphery, and the core metasurface antenna and the peripheral metasurface are connected through a U-shaped slot plug structure, wherein the core metasurface antenna and the peripheral metasurface can be replaced according to different application scenarios. The present disclosure has the characteristics of simple and reliable modular structure and flexible configuration according to task requirements; it meets the requirements of high-precision multiple transmission modes and corresponding amplitude-phase consistent multiple polarization reception of synthetic aperture radar, effectively increases the working bandwidth of the core antenna under low profile, reduces the radar scattering area of the antenna, optimizes the antenna radiation pattern and reduces the mutual coupling characteristics, further improves the imaging performance of the synthetic aperture radar, and reduces the signal-to-interference ratio of the synthetic aperture radar system.

The application discloses a rear body contraction type fluid thrust vector nozzle, which comprises a contraction section, a static pressure cavity, a main jet outlet, a control valve, a contraction wall surface, a secondary flow inlet and a wall surface secondary flow hole. The contraction section is arranged above and below the static pressure cavity, the main jet outlet is arranged at the tail end of the contraction section, the contraction wall surface is arranged at the tail of the static pressure cavity, the secondary flow inlet is arranged on the side of the rear body contraction type fluid thrust vector nozzle, and the wall surface secondary flow hole is arranged on the contraction wall surface. The static pressure cavity is in communication with the secondary flow inlet and the wall surface secondary flow hole, and the secondary flow inlet is controlled by the control valve. The rear body contraction type fluid thrust vector nozzle can realize jet vector deflection control while reducing the thickness of the rear body, has a good application prospect in the integration design of the fluid thrust vector and an aircraft, and can further promote the practical application of the fluid thrust vector nozzle.

The invention provides a ship surface equipment base and a design method thereof. According to the ship surface equipment base, a base body comprises a panel, a web plate and a toggle plate, the web plate and the toggle plate are located below the panel and connected with the panel, the toggle plate is located in the web plate, and when the base body is in a floor type, the included angle formed by the web plate and a ship body ranges from 95 degrees to 99 degrees; when the base body is in a wall-mounted type, the included angle formed by the side surface and the bottom surface of the panel is 95-99 degrees; when the base body is in a cantilever type, the included angle formed by the panel and the toggle plate deviating from the side of the ship body is 80-85 degrees, and the included angle formed by the web plates on the two sides of the panel and the horizontal plane is 95-99 degrees. According to the ship surface equipment base provided by the invention, the shape RCS of a typical small base on a ship surface is reduced and optimized, and based on the optimized shape of the ship surface base, the RCS value of a large number of small reflection sources, namely the ship surface small equipment mounting base, can be effectively reduced, and the improvement of the radar wave stealth capability of the whole ship is facilitated.

The invention discloses an unmanned aerial vehicle cluster stealth flight path planning optimization design method based on task allocation, and the method comprises the steps: designing an unmanned aerial vehicle cluster stealth flight path planning comprehensive cost function based on task allocation based on the voyage cost of an unmanned aerial vehicle flight path, the degree of networking radar threat and the degree of antiaircraft gun threat; taking minimization of an unmanned aerial vehicle cluster stealth flight path planning comprehensive cost function based on task allocation as an optimization target, and taking meeting of flight path feasibility judgment, unmanned aerial vehicle cluster task allocation scheme requirements and unmanned aerial vehicle cluster dynamics limitation as constraint conditions, constructing an unmanned aerial vehicle cluster stealth flight path planning optimization model based on task allocation; and solving the optimization model by adopting an improved algorithm based on a genetic algorithm and an improved A * algorithm to obtain an optimal task allocation scheme of the unmanned aerial vehicle cluster. The application environment is more complex, the stealth performance of the unmanned aerial vehicle cluster is effectively improved, and meanwhile the comprehensive cost of task execution of the unmanned aerial vehicle cluster is effectively reduced.

This invention belongs to the field of metamaterials technology, specifically relating to an adjustable integrated absorption and reflection metamaterial structure. It includes several basic units arranged in a periodic array. Each basic unit comprises a resonant unit, a dielectric layer, and a reflector layer stacked sequentially. The dielectric layer is deformable to create a cavity between itself and the reflector layer or to fit tightly against it. The resonant unit includes four sequentially connected arc-shaped segments arranged centrally symmetrically. The ends of adjacent arc-shaped segments connect to form sharp corners extending towards the center of the resonant unit, with a gap between opposing sharp corners. This invention offers good reconfigurability, high flexibility, and deformability, allowing for easy adjustment of the state and switching of operating modes according to actual usage needs, achieving broadband absorption or complete reflection functions from 4.9 GHz to 16.3 GHz.

The invention discloses an infrared stealth film material of functionalized polystyrene and a preparation method thereof, and belongs to the technical field of functional material preparation. The infrared stealth film material of functionalized polystyrene is composed of the following components in parts by weight: 53-67 parts of a base film material, 8-12 parts of modified polystyrene, and 0.8-1.3 parts of an adhesive, wherein the base film material is prepared from meta-iodoaniline, trimethylsilyl acetylene, diisopropyl xanthate disulfide, tetramethylammonium hydroxide, polyvinylidene fluoride, and polymethyl methacrylate, and the modified polystyrene is prepared from syringaldehyde, n-butyl bromide, 2,2'-dipyrrolyl methane, 2-thiophene boric acid, and polystyrene cross-linked microspheres. The infrared stealth film material of functionalized polystyrene prepared by the method has excellent stealth performance and mechanical properties.

The utility model provides a kind of integrated stealth water column antenna, through the integration design of shell, water pump assembly, ground net plate and signal transmission component, significantly reduce antenna volume and promote stealth performance, shell columnar structure inlaying injection channel and isolation magnetic ring, realize the physical isolation of radio frequency signal and seawater, avoid the radar scattering problem caused by exposed metal parts of traditional shipborne antenna;Water pump assembly is directly connected with the lower side of shell, and forms radiator by injecting seawater, and after communication, pump can be stopped to realize antenna invisibility, signal transmission component and ground net plate are horizontally arranged on the upper end surface of shell, form compact plane layout, ground net plate arranged on the upper end surface of shell floats in sea level during use, only makes nozzle part above sea level, greatly enhances stealth performance, avoids the technical problem that water column antenna in the prior art is only applicable to ship platform use, use scene has great limitation, cannot meet the stealth demand.

The invention provides an active camouflage stealth system and method for a vehicle. The system comprises a central processing unit, a camera shooting unit and a lamp set controller which are connected with the central processing unit, and an RGB lamp set connected with the lamp set controller. Each RGB lamp set is composed of three lamps with the colors being red, green and blue, and the RGB lamp sets are fixed to a flexible net covering the top of the compartment and arranged into a rectangular array which is evenly distributed. The camera unit is used for shooting video images of the ground around the vehicle; and the central processing unit processes the video image to obtain a simulation image of the ground area under the vehicle, and controls the RGB lamp group based on the RGB pixel value of the simulation image, so that the vehicle image obtained by the reconnaissance equipment is approximate to the simulation image. The method has the advantages of novel hiding thought, simple and easy scheme implementation, good hiding effect and the like, and can effectively solve the problem of active optical band camouflage hiding of the vehicle in the road environment.

The invention provides an acoustic vector sensor 2D-DOA estimation method and system of any array structure, and relates to the array sensor direction finding technology. According to the method, the covariance matrix is obtained, characteristic decomposition is performed on the covariance matrix, the signal subspace is solved, rough estimation is performed on the two-dimensional DOA in the vector information according to the signal subspace by adopting the ESPRIT algorithm, and then phase compensation is performed on spatial ambiguity by utilizing the rough estimation result. The 2D-DOA accurate estimation of the acoustic vector sensor of any array structure is realized; the spatial layout of any array is realized by using the vector sensor, and the array element spacing of the sensor is not limited by half wavelength any more; according to the method, the information of a vector part is utilized, the information of a space phase is also utilized, the estimation precision is remarkably improved, spectral peak search and additional two-dimensional angle pairing calculation do not need to be carried out on a covariance matrix of a received signal, and the calculation complexity is remarkably reduced.

The invention relates to the technical field of electromagnetic scattering, in particular to a method for extracting the RCS characteristic of a supersonic target coated with a plasma sheath, and the method comprises the following steps: 1, building a simulation model of the supersonic target; 2, analyzing and testing the RCS characteristics of the supersonic target model; 3, establishing a single-layer plasma sheath model for the supersonic target model, and analyzing and testing the RCS characteristics of the single-layer plasma sheath model; 4, establishing a double-layer plasma sheath model for the supersonic target model, and analyzing and testing the RCS characteristics of the double-layer plasma sheath model; and step 5, comparing and analyzing the RCS characteristics extracted in the step 2, the step 3 and the step 4. According to the invention, the RCS characteristics of the supersonic target coated by the plasma sheath can be comprehensively and accurately detected and analyzed. Through the method, the stealth performance of the supersonic target and the monitoring and striking capability of a defense system can be accurately evaluated.

The application belongs to the technical field of skin materials, and particularly relates to an X-waveband stealth skin, a preparation method and application thereof. The preparation method of the X-waveband stealth skin comprises the following steps: (1) preparing a modified epoxy resin system; (2) laying a carbon fiber mixture to obtain a carbon fiber mixture film layer; (3) laying a conductive mixture on the surface of the carbon fiber mixture film layer to obtain a conductive mixture film layer; (4) laying a wave-absorbing mixture on the surface of the conductive mixture film layer to obtain a wave-absorbing mixture film layer; (5) laying a wave-transmitting mixture on the surface of the wave-absorbing mixture film layer to obtain a skin material; and (6) vacuumizing and heating and curing the skin material to obtain an X-waveband stealth lightning-proof skin. The X-waveband stealth skin has excellent stealth performance and lightning-proof capability, and has a higher mechanical performance retention rate in an ultralow-temperature environment.

The invention discloses an intelligent reflecting surface auxiliary electromagnetic stealth method based on Lagrange duality. The method comprises the following steps: S1, inputting the number of sensing units, the number of passive reflecting units of an intelligent reflecting surface, the number of units on the surface of an uncontrollable material, and wave absorbing efficiency and reflecting phase information of the units; s2, estimating an incoming wave direction of the enemy detection radar in a current coherent processing time interval and transmitting and receiving beam gain information of the enemy detection radar by using a sensor array; s3, constructing an electromagnetic stealth problem assisted by the intelligent reflecting surface; and S4, calculating the amplitude and phase of the passive reflection unit of the intelligent reflection surface by using a Lagrange duality method. According to the intelligent reflecting surface auxiliary electromagnetic stealth method based on the Lagrange duality, the algorithm complexity is remarkably reduced, and the stealth performance of the target is improved, so that the stealth combat requirement of a modern battlefield can be met, and the method adapts to the complex and changeable battlefield situation.

This invention discloses a ship's bridge roof structure, comprising: a sealing plate, a reinforcing web, and a wiper mounting base. The sealing plate is integral, with both edges connected to the hull plating, providing a smooth transition and completely covering the upper area of ​​the bridge window. The reinforcing web connects the sealing plate to the hull plating, and the wiper mounting base extends from it. The wiper mounting base consists of a panel and an elbow plate, allowing for the installation of wipers. This invention completely conceals the wiper mounting area along the upper edge of the bridge window with an integral sealing plate, effectively improving the ship's stealth capabilities without compromising its overall aesthetic appearance. Secondly, it completely protects the wipers from direct impact by seawater and storms, significantly reducing equipment failure rates. Finally, it changes the conventional front-mounted wiper installation to a top-down installation between the sealing plate and the hull plating, allowing workers to operate from the upper deck, ensuring safety and reliability, and enabling rapid wiper installation and removal, greatly improving maintainability.

The invention relates to the technical field of aero-engines, in particular to a thrust vectoring nozzle and an aero-engine. The thrust vectoring nozzle comprises a conical cylinder and a convergence mechanism. The device further comprises a first control mechanism and a plurality of first adjusting assemblies. A plurality of hinge points distributed along the circumference are formed at one end, far away from the conical cylinder, of the convergence mechanism; the multiple first adjusting assemblies are in one-to-one correspondence with the hinge points, and the multiple first adjusting assemblies are sequentially attached in the circumferential direction to form a cylindrical expansion section; the first control mechanism comprises a first control ring and a first control assembly; one end of the first control assembly is connected with the conical cylinder, and the other end is connected with the first control ring; the first control ring is connected with the first adjusting assemblies in a sliding fit mode, the first control ring can drive the first adjusting assemblies to deflect when moving in the center line direction of the conical cylinder, and a structure with the oval cross section is formed. Round-to-ellipse conversion can be realized, the stealth performance is improved, the characteristic of vector deflection is reserved, and the survival probability of a fighter in a battlefield can be greatly improved.

The utility model belongs to the technical field of full-automatic ship equipment, and provides a stealth protection device for ship equipment. Comprising a ventilation device, a door stopper, a door, a sealing device, a protection device body and a cover plate. Three doors capable of being opened are arranged on the protection device body, and the doors can be closed and opened by rotating the hinges. A door stopper is arranged on the protection device body and used for fixing an opened door. Two detachable doors are arranged on the lateral front portion of the protection device body, and a cover plate is arranged below the front portion of the protection device body. A ventilation device is arranged above the rear part of the protection device body, and a sealing device is arranged in front. A carbon fiber composite interlayer is arranged in a shell of the protection device body, the inner surface or the outer surface of the protection device body is coated with a stealth coating, and the outer surface of the protection device body is coated with corrosion-resistant paint. By adopting the polyhedral appearance reflection principle and utilizing the wave absorbing effect of the carbon fiber composite interlayer and the wave absorbing effect of the stealth coating, the protection device is smooth and simple in appearance, light in weight and good in stealth effect, and the requirements of equipment stealth and adaptability are met.

Toner comprising toner particles, wherein the toner contains gold nanorods, and wherein in a case where an aspect ratio distribution of the gold nanorods contained in the toner is measured, an average value µ in the aspect ratio distribution is in a range of 6.0 to 13.0 and a standard deviation σ in the aspect ratio distribution is in a range of 0.5 to 4.5.

The invention discloses a large-size frequency selective surface invisible antenna housing and a preparation method thereof. The antenna housing comprises an outer skin layer, a frequency selective surface layer, a sandwich layer and an inner skin layer which are sequentially stacked from outside to inside. The preparation method comprises the following steps: splicing the frequency selective surface layer by adopting small-size diaphragms, filling butt joint gaps with conductive slurry, and curing to realize electric connection to form a complete surface. The method has the advantages that: 1, the production cost is less than 10% of that of a laser etching method; and 2, large-size products are manufactured by slicing and then splicing. And 3, the process is controllable. And 4, the stealth performance is excellent.

This invention discloses an air conditioning control method, device, electronic device, and storage medium. The method includes: in harsh environments, controlling the air conditioner to operate according to a preset operating strategy corresponding to the preset level; for air conditioners whose preset level requires normal operation even in harsh environments, controlling them to maintain normal operation; for air conditioners whose preset level allows for low-energy operation in harsh environments, adjusting the air conditioner's operating parameters according to adjustment rules that improve the air conditioner's stealth and / or shock resistance; and for air conditioners whose preset level requires forced shutdown in harsh environments, controlling them to be forcibly shut down. This method can solve the technical problem in related technologies where air conditioning control methods cannot coordinate comfort and safety in harsh environments.

The invention relates to the technical field of fastening connection of aerospace, and particularly discloses a high-shear-resistance slotless titanium alloy threaded self-plugging rivet and a preparation process thereof.The self-plugging rivet comprises a core rod, a pipe body, a rivet body and a driving nut, the driving nut, the rivet body and the pipe body are sequentially arranged on the core rod in a sleeving mode, and the rivet body is divided into a head part, a middle part and a tail part; the end face of the end, close to the driving nut, of the nail body head is flat, the driving nut abuts against the end face, a threaded groove allowing the core rod to penetrate through is formed in the center of the end face, the surface roughness of the end face is 1.6-2.2 micrometers, and the diameter of the outer circle of the end face is larger than that of the circumcircle of the driving nut. The end face of the head of the rivet body is flat, the center of the end face is only provided with the threaded groove allowing the core rod to penetrate through, after the core rod is broken, the core rod can completely shield the threaded groove in the center of the end face, and the structure can reduce the radar reflection area and improve the stealth performance of an airplane.

The invention discloses a military anti-infrared electromagnetic shielding intelligent stealth fabric, and relates to the technical field of intelligent fabrics, the military anti-infrared electromagnetic shielding intelligent stealth fabric comprises an aramid fiber base layer, an electromagnetic shielding layer, an anti-infrared composite layer, a functional layer and an induction adjustment integration module, the outer side of the aramid fiber base layer is provided with the electromagnetic shielding layer, and the electromagnetic shielding layer is arranged on the outer side of the functional layer; an anti-infrared composite layer is arranged on the outer side of the electromagnetic shielding layer, and an induction adjustment integrated module is arranged on the outer side of the aramid fiber base layer. The anti-infrared composite layer is arranged on the outer side of the electromagnetic shielding layer, graphene forms an isolation layer to reflect infrared rays emitted by a human body and effectively guide energy of electromagnetic waves so as to achieve electromagnetic shielding, and diethylene glycol monobutyl ether is beneficial to uniform dispersion of graphene in the water-based acrylic emulsion; the titanium oxide powder with low emissivity and the cobalt ion doping amount of 1.3% is selected for the infrared stealth layer, infrared radiation is reduced, and it is avoided that the infrared stealth layer is found by an infrared detector.

This utility model discloses a flush-fitting, concealed fire door, including a door frame. Both sides of the door frame are hinged to door panels via concealed hinges, and the surface of each door panel has a mounting groove. This utility model employs a flush-fitting frame and door panel design, using concealed hinges to connect the door frame and door panel, ensuring that the front of the door frame and the front of the door panel are on the same plane, parallel to the wall. This allows it to seamlessly integrate into the overall decoration style of modern buildings, avoiding the visual abruptness caused by uneven frame and door panel openings in traditional fire doors. This significantly enhances the aesthetics of the building's interior space and achieves an excellent concealed effect. By setting mounting grooves on the door panel surface and fixing fire-resistant sealing strips within the grooves, the sealing performance of the device is effectively improved. Multiple insulation layers work together to greatly enhance the heat insulation performance of the device. This device possesses the advantages of being aesthetically pleasing, having a good concealed effect, excellent sealing performance, and good heat insulation performance.

The utility model relates to the technical field of stealth bionics, and discloses a stealth cloak which adopts a one-piece pullover type design and a pullover head opening cylinder design. And snap fasteners and air holes are arranged on the side edges. The invisible cloak comprises a cloak body, a hidden pocket, a cap and a storage bag. The invisible cloak is formed by cutting and sewing infrared invisible fabric; the infrared stealth fabric is made of photonic crystal coating base cloth; the cloak body and the cap are of an integrated structure. The inner layer of the photonic crystal coating base cloth is coated to form a waterproof layer; a flame-retardant layer is also arranged between the base cloth and the waterproof layer; a plurality of groups of three-dimensional bionic layers are sewn on the outer surfaces of the cloak body and the cap, and the three-dimensional bionic layers are made of the same material as the cloak body and the cap. The multifunctional invisible clothes have visible light and infrared stealth, waterproof and flame-retardant functions, and also have the advantages of being convenient to put on, take off, store and carry.

The invention provides an arbitrary array MIMO radar angle estimation method and system based on phase compensation, and relates to the technical field of radar positioning. Comprising the following steps: calculating a covariance matrix of a signal from a signal model after array matching filtering of a receiving end, blocking the obtained covariance matrix, obtaining a permutation matrix, constructing a matrix by using the permutation matrix and a unit matrix, carrying out blocking operation on the matrix, obtaining an initial phase difference matrix of array elements, and obtaining an initial phase difference matrix of the array elements; the method comprises the following steps: roughly estimating a non-fuzzy low-precision phase difference matrix by using a phase difference matrix in which the distance between adjacent sensor array elements is smaller than half wavelength, solving ambiguity, and compensating the ambiguity to an initial ambiguous phase difference matrix to obtain a non-fuzzy high-precision phase difference matrix; and finally, accurately estimating azimuth angles and pitch angles of the two-dimensional wave departure angle 2D-DOD and the two-dimensional direction of arrival 2D-DOA. The phase ambiguity is avoided, the estimation accuracy is improved, and the calculation complexity is reduced.

The present invention is applicable to the technical field of bionic underwater vehicles, and provides an integrated 3D printed flexible rudder variant mechanism based on a sliding tongue structure, including a flexible rudder structure, a power structure, a skin structure and a support structure. The entire mechanism drives the sliding tongue structure to slide in the sliding tongue groove below the rigid leading edge by means of the meshing of a transmission gear and a rack. When the driving force is applied along the flexible trailing edge, the flexible trailing edge deflects upward, and when the driving force is applied along the rigid leading edge, the flexible trailing edge deflects downward, thereby realizing the deformation of the flexible rudder structure. The first deflection gear drives the inner panel to rotate to drive the flexible rudder structure to deflect as a whole. The present invention overcomes the limitations of traditional continuously deformable rudder blades in miniaturization, flutter suppression and stealth performance, realizes the dual functions of deflection and rudder type change, enables underwater vehicles to move more efficiently and stably in complex underwater flow field environments, and provides strong technical support for deep-sea exploration, underwater operations and other fields.

This invention provides an embedded air intake structure, relating to the field of flight equipment. It includes an air intake body with a bottom wall and an air inlet. The bottom wall of the air intake body is fixedly connected to the trailing edge of an aircraft wing. The upper surface of the bottom wall of the air intake body is streamlined, allowing for a smooth transition with the upper surface of the wing. The opening of the air intake body near the wing end serves as the air inlet. When the aircraft is in horizontal flight, the air inlet is located above the bottom wall of the air intake body and below the highest point of the upper surface of the wing. This invention also provides an aircraft, including a wing, a fuselage, and the aforementioned embedded air intake structure. The bottom wall of the air intake body is fixedly connected to the trailing edge of the wing, and the wing is fixedly connected to the fuselage. The embedded air intake structure and aircraft provided by this invention can improve air intake efficiency, reduce strong radar echoes, and improve radar stealth performance.

The invention provides an antenna aperture stealth shape design method conformal with an aircraft skin and an aircraft, and belongs to the field of stealth aircraft aerodynamic shape design. The method comprises the steps that S10, the aircraft skin shape of an antenna aperture mounting area and the antenna aperture center point position are acquired; s20, selecting a universal carrier three-dimensional model, and replacing the aircraft skin shape of the antenna aperture mounting area with an initial carrier three-dimensional model formed by a universal carrier surface shape; s30, according to the stealth performance requirement of the antenna aperture, the initial carrier three-dimensional model is imported into electromagnetic simulation software for simulation optimization, and an optimized carrier three-dimensional model is obtained; and S40, determining an antenna aperture shape and a structure installation parameter, forming a cavity opening conforming to the antenna aperture shape and the structure installation parameter at the antenna aperture center point position of the optimized carrier three-dimensional model, and performing simulation optimization according to the stealth performance requirement to obtain an antenna aperture stealth shape conforming to the aircraft skin and conforming to the requirement.