9results about How to "Reduce reflective area" patented technology

The present invention discloses a bulkhead type hidden connection node, comprising a back plate, the back plate is provided with a through hole two, an internal threaded round steel cylinder is welded in the through hole two, the internal threaded round steel cylinder is provided with a threaded hole one and a conical groove, the bulkhead is provided with a through hole one at the connection node, the back plate is fixedly connected to the inner side of the bulkhead by welding, and the head of the internal threaded round steel cylinder is installed in the through hole one; when no equipment is connected, a cross countersunk bolt is fixedly installed in the threaded hole one; when erecting structures or mounting other equipment, a connection pair two is fixedly installed in the threaded hole one by an external hexagonal bolt one and an external hexagonal bolt two; after adopting the above structure, the bulkhead can be made flat without protrusions and beautiful in appearance; the radar reflection area is effectively reduced, so that the ship has better stealth performance; and a fixed connection node is provided when erecting external structures on the ship, which is simple to operate and safe and reliable.

The present invention belongs to the field of underwater unmanned submersible equipment design, and in particular, relates to a four-axis tilting propulsion underwater robot. It includes a shell 1, a frame 2, a tilting propulsion assembly 3, and an operating assembly 4; the shell 1 is composed of an upper shell 10 and a lower shell 11 that are spliced ​​together; the inner side of the upper shell 10 and the lower shell 11 is provided with a guide channel surrounded by the shell surface, and the frame 2 includes a support plate arranged in the shell 1 for connecting and supporting the shell 1, the propulsion assembly 3 and the operating assembly 4; the tilting propulsion assembly 3 includes a first propeller 30, a second propeller 31, a first steering gear 32, and a second steering gear 33. The operating assembly 4 includes: a third steering gear 40 arranged at the bottom of the front side of the shell 1, and a clamp arm 41 installed on the steering gear 40. A four-axis tilting propulsion underwater robot of the present invention is mainly used for operating tasks in complex ocean current environments, for improving the control accuracy of water washing submersibles, and for completing some operating tasks with higher requirements for accuracy and anti-interference.

The application relates to an antenna reflector plate, an antenna and a communication device. The antenna reflector plate comprises a first reflector plate and a second reflector plate connected to each other; wherein the first reflector plate has the characteristics of being able to transmit high-frequency signals and reflect low-frequency signals, and the second reflector plate has the characteristics of being able to reflect high-frequency signals and low-frequency signals. The antenna reflector plate can improve the distortion degree of the radiation pattern of the high-frequency band radiation unit and ensure the antenna radiation index.

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 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 belongs to the technical field of doctor blade detection devices, and particularly relates to real-time doctor blade monitoring equipment for tipping paper preparation, which comprises detection equipment, and a detection instrument is arranged in the detection equipment to detect and analyze a doctor blade; the detection equipment comprises a rotary drum, the rotary drum is rotationally connected into the detection equipment, the rotary drum is connected with a motor arranged in the detection equipment, and a correction plate is arranged on the rotary drum; the winding plate drives the sticker to stretch out of the sealing door through the winding shaft and to be tightly attached to the upper half portion of the doctor blade, the sticker with light absorption coating is pasted to the side, facing the lamp, of the doctor blade, the correction plate coated with the light absorption coating is matched, the reflection effect of light emitted by the lamp on the doctor blade and the correction plate is reduced, and therefore the quality of imaging patterns is improved. Therefore, the detection equipment can more accurately analyze and detect the flatness of the doctor blade, the detection precision is improved, and the real-time monitoring effect of the doctor blade is further improved.

The invention provides a stealth rudder surface installation structure of a flying wing layout target aircraft, comprising an aileron unit and a drag rudder unit, wherein the aileron unit comprises an aileron servo, a servo rocker arm, a servo connecting rod, an oblique rib, a right-side supporting seat, a rudder surface and a left-side connecting seat, and the drag rudder unit comprises two drag rudder servos, a servo rocker arm, a servo connecting rod, an upper rudder surface of a drag rudder, a lower rudder surface of a drag rudder, a right-side mounting seat, a left-side mounting seat, a transverse axis, a drag rudder pulling seat and a stabilizer rear beam. The stealth rudder surface installation structure of the flying wing layout target aircraft is reasonably designed, can make the lower surface of the aircraft have no protrusions, when irradiated by a radar, the reflection area is very small, can achieve a stealth effect, and in addition, the rudder surface is detachable for easy maintenance.

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.

The invention belongs to the technical field of optical systems, and particularly relates to a stray light removing anti-dazzling screen for an iris diaphragm of an optical system, which comprises an upper surface and a lower surface which are parallel to each other, and a left side surface and a right side surface which are connected between the upper surface and the lower surface, the left side face forms an inclined section in a laser cutting or die punching mode. Compared with the prior art, through ingenious structural design, a laser cutting or die punching method is adopted, an inclined section is formed on the left side face, the reflection area can be reduced, the reflection angle can be changed, the reflectivity can be reduced, and the effect of removing stray light is finally achieved.