10results about How to "Good stealth" patented technology

The invention discloses an underwater operation device based on bionic motion design, and relates to the field of underwater operation devices.The underwater operation device comprises a device body and a plurality of sets of bionic flapping wings which are arranged in the circumferential direction of the device body and rotationally connected to the device body; each group of bionic flapping wings comprises two bionic flapping wings which are the same in structure and are symmetrically arranged on the two radial sides of the device body, and the main control module controls the two bionic flapping wings in the propelling wing group to flap symmetrically through the flapping wing control assembly so as to realize propelling control; the main control module controls the two bionic flapping wings in the control wing group to flap asymmetrically through the flapping wing control assembly so as to control and adjust the course, and efficient propelling and rapid maneuvering of the underwater operation device can be achieved by controlling flapping movement of the bionic flapping wings. Compared with a traditional underwater operation device, the underwater operation device has the advantages of being low in noise, high in endurance, high in navigation efficiency and the like, and the task carrying requirement of the underwater operation device is met.

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 present invention proposes a low-pass absorption frequency selection structure with a narrow transition band. The transition bandwidth of the currently reported low-pass absorption frequency selection structure is narrow, and the selectivity is not excellent enough. The present invention is a periodic structure. The structural unit is composed of two parts, one is a loss layer, and the other is a three-dimensional band-stop structure. The loss layer uses radio frequency resistors and bent metal wires with large equivalent inductance values, and the three-dimensional band-stop structure uses metal strips printed on a dielectric substrate in the vertical direction. The entire structure has the characteristics of high-frequency wave absorption and low-frequency wave transmission, and a narrow transition band. The present invention perfectly matches the performance indicators of antenna covers of a large number of ultra-wideband antennas and spectrum monitoring systems working in the VHF / UHF frequency bands used in the military field, and has strong applicability.

The present invention discloses a process method for coating a hatch cover transparent part, which belongs to the field of coating technology and includes the following steps: S1, applying a primer to the hatch cover transparent part, firstly preparing the primer, then applying the primer, then waiting for the surface to dry, and finally drying the hatch cover transparent part; S2, placing the hatch cover transparent part on a supporting part, then sending the hatch cover transparent part and the bottom coating part into a tank body, a manipulator is provided inside the tank body for coating the surface of the hatch cover transparent part, closing the sealed tank body, and evacuating; S3, introducing oxygen and argon into the tank body, while ensuring that the argon-oxygen ratio is within the range of 30-40 during the coating process; S4, applying a top coating to the hatch cover transparent part. After coating the hatch cover transparent part by the process method, the light transmittance and square resistance of the hatch cover transparent part can meet the use requirements, that is, the light transmittance is ≥80%, and the square resistance is within the range of 9-12Ω / □.

This invention discloses a radar-infrared compatible stealth composite material with infrared camouflage function, belonging to the field of multi-spectrum compatible stealth technology. The radar-infrared compatible stealth composite material comprises, from top to bottom, a top coding layer, a first dielectric layer, a second dielectric layer, a conductive reflective layer, and a third dielectric layer along the electromagnetic wave propagation direction. The top coding layer includes several zero-patch large units and one-patch large units. Along the electromagnetic wave propagation direction, the zero-patch large units and one-patch large units, together with the dielectric layer and reflective layer below them, constitute zero-coding units and one-coding units, respectively. These units are arranged in an array structure according to coding patterns generated by a multi-objective optimization algorithm. This invention utilizes the arrangement of zero-coding units and one-coding units to construct an infrared camouflage pattern matching the complex background thermal radiation characteristics in the infrared band, and utilizes the reflection phase difference between the two coding units in the microwave band to achieve radar cross-section reduction, thus completing radar-infrared compatible stealth.

The present invention relates to a wearable visible and infrared dual-band stealth material and a preparation method thereof, which specifically comprises the following steps: using a double-pass porous material as a substrate, evaporating gold particles on the substrate material by electron beam evaporation to form a composite device of the substrate material and gold; placing the formed composite device in a reaction liquid to react, dissolving the substrate material in the reaction liquid, leaving a gold structure; depositing a high-temperature resistant metal oxide on one side where a gold column is set, and the deposition thickness is nanometer-scale. The obtained stealth material has dual stealth characteristics of visible and infrared through the localized plasmon effect between the gold particles, and at the same time, because of its large number of pores, it provides comfortable wearing characteristics.

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.

This invention discloses a modular lift supply aircraft, a combined aircraft, and a method for operating the combined aircraft, relating to the field of aircraft technology. The modular lift supply aircraft is equipped with a lift-providing device, a male docking head, and a female docking head. The combined aircraft includes a main aircraft and a modular lift supply aircraft mounted on the main aircraft. This invention provides a modular lift supply aircraft, a combined aircraft, and a method for operating the combined aircraft, enabling fixed-wing aircraft to achieve vertical takeoff and landing capabilities while still maintaining large payload, long range, and good stealth performance.

The invention discloses a radar and infrared compatible stealth composite material with an infrared camouflage function, and belongs to the technical field of multi-spectrum compatible stealth. The radar infrared compatible stealth composite material sequentially comprises a top coding layer, a first dielectric layer, a second dielectric layer, a conductive reflecting layer and a third dielectric layer from top to bottom in the electromagnetic wave propagation direction. The top coding layer comprises a plurality of zero patch large units and one patch large unit; the zero patch large unit and the first patch large unit from top to bottom respectively form a zero coding unit and a first coding unit together with the dielectric layer and the reflecting layer below the zero patch large unit and the first patch large unit from top to bottom along the electromagnetic wave propagation direction; and array structures are formed according to coding patterns generated by a multi-objective optimization algorithm. The zero coding unit and the one coding unit are arranged, an infrared camouflage pattern matched with complex background thermal radiation characteristics is constructed in an infrared band, and the reflection phase difference between the two coding units is utilized in a microwave band, so that the radar cross section is reduced, and radar infrared compatible stealth is completed.

The invention provides a marine stealth mast and a camouflage pattern manufacturing method thereof. The camouflage pattern manufacturing method for the marine stealth mast comprises the steps that the spot size of a camouflage pattern is determined according to the observation distance of detection equipment to the mast; performing surface extraction on the three-dimensional solid model of the mast body to obtain a curved surface model comprising all surfaces, making spots on the curved surface model, and unfolding the surface of the curved surface model into a two-dimensional plane to obtain a two-dimensional pattern template; according to the two-dimensional pattern template, manufacturing an entity pattern template containing the spots of the camouflage pattern; and spraying the main color of the visible light stealth coating on the mast body, coating the entity pattern template on the surface of the mast body, and removing the entity pattern template after coating the contrast color of the visible light stealth coating at the spots. According to the manufacturing method provided by the invention, on one hand, the fusion degree of the mast and the ocean background is improved, and on the other hand, the deviation between an actual pattern and a designed pattern is reduced.