Electrostatic discharge method for fixed-wing stealth aircraft

Abstract

The invention discloses an electrostatic discharge method for a fixed-wing stealth aircraft, and relates to the technical field of aircraft electrostatic discharge. An electrostatic discharge device adopted by the method comprises a pressing lock catch which is arranged in an aircraft skin; one end of the discharge column is self-locked by pressing the lock catch, and the other end extends out of the machine body to serve as a discharge tip; one part of the high-resistance lap joint strip is tightly attached to the aircraft skin through conductive adhesive, and the other part of the high-resistance lap joint strip is arranged on the pressing lock catch; an electrostatic coating is sprayed on the surface of the pressing lock catch, and the pressing lock catch is connected with the high-resistance lap joint strip in an electrostatic conduction mode. The discharge end can be quickly and conveniently replaced and maintained by pressing the lock catch without detaching the aircraft skin, the maintenance cost is reduced, the time is saved, and more economic benefits are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft electrostatic discharge, and in particular to an electrostatic discharge method for a fixed-wing stealth aircraft. Background Art

[0002] When an aircraft is flying, the continuous friction and collision with air and space particles (dust, raindrops, ice crystals and sand, etc.) causes static electricity to be generated on the aircraft surface. When the static electricity accumulates to a certain extent, it causes the air near the tip of the aircraft to break down, and static electricity discharge will occur at the tip or protrusion of the aircraft surface, causing interference to navigation, communication and other systems in a wide frequency range, and in severe cases, causing the aircraft to fail.

[0003] The technical principle of the solution is that the electrostatic discharge device installed on the trailing edge of the aircraft stabilizer or control surface can release the static charge accumulated in these parts by using the tip discharge principle, so that the accumulated charge can be discharged before reaching the broadband noise level that causes corona, effectively reducing the corona threshold voltage on the surface of the aircraft body. The electrostatic discharge device smoothly releases the deposited static charge on the body in a low-noise manner, promoting low-current, relatively high-voltage discharge.

[0004] Traditional electrostatic discharge devices are installed protruding from the aircraft surface, usually exposed 100mm to 200mm, resulting in a large number of protrusions on the original shape of the aircraft, affecting the appearance. In addition, they also have a large RCS, which will produce strong radar target scattering characteristics and destroy the stealth characteristics of the aircraft. Stealth aircraft have good low scattering performance, and there are almost no protruding parts on the outer surface of the aircraft, so the electrostatic discharge device is also required to be designed not to protrude from the aircraft wing structure.

[0005] According to the current search, the electrostatic discharge devices designed by Aibang Electromagnetic and aviation industry related units are all traditional electrostatic discharge devices, which are installed by riveting and bonding on the outer surface of the aircraft skin. Xi'an Aibang Electromagnetic Technology Co., Ltd. designed a high-temperature resistant structural conformal electrostatic discharge device that can conform to the aircraft, but once the discharger is damaged, the aircraft skin needs to be destroyed when replacing it, which is costly and time-consuming. In addition, it is a low-resistance electrostatic discharge device with relatively large discharge noise. Summary of the invention

[0006] In view of the deficiencies in the above-mentioned background technology, the present invention mainly solves the problem that the existing electrostatic discharge device has a great impact on the appearance structure of the aircraft and has poor stealth performance. The present invention provides an electrostatic discharge method for a fixed-wing stealth aircraft. The electrostatic discharge device used in this method embeds the base of the electrostatic discharge device into the aircraft skin, cleverly uses high-resistance lap strips and press locks to form a high-resistance path, and replaces the traditional high-resistance discharge rod structure; compared with the traditional electrostatic discharge device, it effectively reduces the RCS of the electrostatic discharge device and the aerodynamic drag on the aircraft.

[0007] The object of the present invention is to provide an electrostatic discharge method for a fixed-wing stealth aircraft, wherein the electrostatic discharge device used in the method comprises: A push lock, which is set in the aircraft skin; The discharge column has one end that is self-locked by pressing a lock buckle, and the other end that extends outside the body as a discharge tip; A high-resistance lap strip, a portion of which is closely attached to the aircraft skin via conductive adhesive, and another portion of which is disposed on the push lock buckle; The surface of the push lock buckle is sprayed with an electrostatic coating and is connected to the high-resistance lap strip by electrostatic conduction; The process of using a discharge device to discharge static electricity on a fixed-wing stealth aircraft includes: After the aircraft skin generates electrostatic charge, the electrostatic charge is transmitted to the push lock through the high-resistance strap, and then transmitted to the discharge column by the push lock, and then concentrated to the discharge tip of the discharge column, and breakdown discharge occurs between the discharge tip and the water molecules in the air or clouds.

[0008] Preferably, the high-resistance overlapping strips include at least two, and the at least two high-resistance overlapping strips are overlapped and fixed to the push lock buckle at the overlapped position by screws.

[0009] Preferably, the high-resistance strap and the push lock buckle jointly form a high-resistance path.

[0010] Preferably, the resistance of the high-resistance strap is 6-200 MΩ.

[0011] Preferably, the high-resistance strap is a flexible non-metallic high-resistance strap.

[0012] Preferably, one end of the discharge column connected to the push lock has a circle of grooves in the circumferential direction, and the grooves are self-locking with the push lock; The discharge tip of the discharge column is in a frustum-shaped form, and is used to discharge deposited static electricity.

[0013] Preferably, the push lock buckle is an automatic rebound push self-locking lock buckle.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an electrostatic discharge method for a fixed-wing stealth aircraft. Aiming at the thin rear edge of the fixed-wing stealth aircraft, the present invention embeds the base of the electrostatic discharge device into the aircraft skin, and cleverly uses high-resistance lap strips and press locks to form a high-resistance path, replacing the traditional high-resistance discharge rod structure; compared with the traditional electrostatic discharge device, the electrostatic discharge device effectively reduces the RCS and the aerodynamic drag of the aircraft; The electrostatic discharge device adopted by the present invention has a high-resistance lap strip connected and fixed to the inner aircraft skin by conductive adhesive, which replaces the traditional rivet fastening method, reduces damage to the aircraft, and also reduces the RCS of the electrostatic discharge device.

[0015] The electrostatic discharge device adopted by the present invention cleverly utilizes a press lock buckle to achieve quick and convenient replacement and maintenance of the discharge terminal without disassembling the aircraft skin, thereby reducing maintenance costs, saving time, and being more economical.

[0016] Compared with traditional electrostatic discharge devices, the electrostatic discharge device adopted by the present invention has the advantages of small structure, light weight, low RCS and easy maintenance. It can effectively reduce the aerodynamic drag on the aircraft, reduce the consumption of parts, reduce costs, and solve the problems of existing electrostatic discharge devices having a great impact on the appearance structure of the aircraft, poor stealth performance and difficult maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the electrostatic discharge device used in the present invention; Figure 2 A schematic diagram of the connection structure of the medium-voltage lock buckle, the discharge column and the high-resistance bridging strip of the electrostatic discharge device provided by the present invention; Figure 3 A schematic side view of an electrostatic discharge device provided by the present invention; Figure 4 for Figure 3 Left view of . DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments and drawings, but the embodiments are not intended to limit the present invention.

[0019] The purpose of the present invention is to provide an electrostatic discharge method for a fixed-wing stealth aircraft, which solves the problem that the existing electrostatic discharge device has a great impact on the appearance structure of the aircraft and has poor stealth performance.

[0020] To achieve the above purpose, see Figures 1 to 4 As shown, a static discharge method for a fixed-wing stealth aircraft, the static discharge device used in the method includes a press lock, a discharge column and a high-resistance lap strip; A push lock is arranged in the aircraft skin; a discharge column, one end of which is self-locked by the push lock, and the other end extends outside the fuselage as a discharge tip; a high-resistance lap strip, a part of which is tightly attached to the aircraft skin through conductive glue, and the other part is arranged on the push lock; the surface of the push lock is sprayed with an electrostatic coating, and is electrostatically conductively connected to the high-resistance lap strip.

[0021] The process of using a discharge device to discharge static electricity on a fixed-wing stealth aircraft includes: After the aircraft skin generates electrostatic charge, the electrostatic charge is conducted to the push lock buckle 3 through the high-resistance strap 1, and then the push lock buckle 3 is conducted to the discharge column 4, and then concentrated to the discharge tip of the discharge column 4, and breakdown discharge occurs between the discharge tip and the water molecules in the air or clouds.

[0022] To this end, the present invention uses a high-resistance lap strip to conduct static electricity between the push lock and the aircraft skin, and then conducts static electricity from the push lock to the discharge column, forming a static charge discharge path from the aircraft skin, the high-resistance lap strip, the push lock to the discharge column. The present invention embeds the base of the electrostatic discharge device, that is, the push lock, into the aircraft skin, and uses the high-resistance lap strip and the push lock to form a high-resistance path, replacing the traditional high-resistance discharge rod structure; the high-resistance lap strip is connected and fixed to the inner aircraft skin by conductive glue, replacing the traditional rivet fastening method, reducing damage to the aircraft body, and also reducing the RCS of the electrostatic discharge device.

[0023] At least two high-resistance overlap bars are provided, at least two high-resistance overlap bars are overlapped, and fixed to the press lock buckle at the overlapped position by screws. Therefore, by providing multiple high-resistance overlap bars, static electricity on the machine body can be efficiently conducted to the discharge column.

[0024] The high-resistance strap and the push-lock buckle are combined to form a high-resistance path.

[0025] The resistance of the high-resistance strap is 6-200MΩ.

[0026] The high-resistance lap strip is a flexible non-metallic high-resistance lap strip.

[0027] The end of the discharge column connected to the push lock has a circle of grooves in the circumferential direction, and the grooves and the push lock are self-locking; the discharge tip of the discharge column is in a frustum shape to discharge the deposited static electricity. The push lock is an automatic rebound push self-locking lock. Therefore, the discharge column can be replaced at any time by pressing the lock.

[0028] In order to further illustrate the electrostatic discharge method for a fixed-wing stealth aircraft provided by the present invention, it is described again in conjunction with the accompanying drawings.

[0029] See also Figures 1 to 4As shown, a miniaturized low RCS base embedded electrostatic discharge device for a fixed-wing stealth aircraft includes: two non-metallic L-shaped high-resistance lap strips 1, a push lock buckle 3, a discharge column 4, and a screw 2. One side of the L-shaped non-metallic high-resistance lap strip is closely attached to the aircraft skin through conductive adhesive, and the other end of the bent surface is overlapped on the push lock buckle 3 through a screw. One end of the discharge column 4 is self-locked by the push lock buckle, and the other end extends to the outside of the fuselage as a discharge tip; wherein, the end of the discharge column 4 connected to the push lock buckle is provided with a combination of a cylinder and a truncated cone with a groove, and is self-lockingly connected to the push lock buckle 3 through the groove, forming a static charge discharge path from the aircraft skin, the L-shaped high-resistance lap strip 1, the push lock buckle 3 to the discharge column 4.

[0030] Among them, the L-type non-metallic high-resistance lap strip is a flexible material with a resistance value between 6 and 200MΩ, which can be adjusted up and down according to the thickness of the aircraft's trailing edge. The L-type non-metallic high-resistance lap strip is a high-resistance flexible non-metallic structure with a total length of 20mm, a width of 10mm, and a thickness of 0.5mm; The push lock buckle 3 is a common self-locking fastener on the market. It has a cubic structure of 30mm long, 10mm wide and 10mm high. A screw hole with a diameter of 3mm is left at one end, and a pair of bending clamps are provided at the other end. The surface of the push lock buckle 3 is sprayed with an electrostatic coating and has the ability to conduct static electricity. The discharge column 4 is fastened to the push lock buckle 3 by pressing. By pressing again, the discharge column 4 can be popped out for replacement.

[0031] The screw 2 is installed in the threaded hole of the push lock buckle 3 to overlap the non-metal L-shaped high-resistance lap strip 1 and the push lock buckle 3 together.

[0032] The discharge column 4 is composed of a cylinder with a groove and a truncated cone. The discharge tip of the discharge column is truncated cone-shaped for discharging the deposited static electricity. The end of the discharge column connected to the push lock has a groove for self-locking with the push lock 3. The total length is 30 mm, the diameter is 2 mm, and the tip diameter is 1 mm.

[0033] One side of the L-shaped non-metallic high-resistance lap strip is closely attached to the aircraft skin through conductive adhesive, and the other end of the bent surface is lapped on the push lock buckle 3 through screws.

[0034] The electrostatic charge discharge path formed by the discharger provided by the present invention is: aircraft skin, L-shaped high-resistance lap strip 1, push lock buckle 3, and discharge column 4. The L-shaped high-resistance lap strip 1 and the push lock buckle 3 form a high-resistance path, which is equivalent to the high-resistance rod of the traditional electrostatic discharge device.

[0035] The present invention provides an electrostatic discharge method for a fixed-wing stealth aircraft. When the aircraft is flying at high altitude, the surface of the fuselage will rub against the air, dust, water droplets, ice crystals and other materials at high speed, thereby generating electrostatic charges. Under the action of the electromagnetic field, the electrostatic charges are concentrated on the relatively sharp and thin edge areas of the aircraft surface. The charged charges generated by the aircraft will pass through the aircraft skin-high resistance lap strip-press-type buckle-discharge device tip, and will be concentrated on the top metal needle of the discharge device. Without too much charge energy accumulation, breakdown discharge can occur between the needle and the water molecules in the air or clouds, causing a local "lightning strike" effect with very small energy. In this way, the charge energy accumulated on the surface of the aircraft can be released into the atmosphere. Avoid the formation of high-energy electric energy accumulation and release process of the charge, avoid electromagnetic field interference to the aircraft's communication and navigation, protect the normal operation of the instrument and electronic equipment on the aircraft, and ensure flight safety.

[0036] The present invention describes preferred embodiments and their effects. However, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for discharging static electricity of a fixed-wing stealth aircraft, characterized in that: The electrostatic discharge device used in this method includes: A push lock (3) disposed in the aircraft skin; A discharge column (4), one end of which is self-locked by pressing the lock buckle (3), and the other end of which extends outside the body to serve as a discharge tip; A high-resistance lap strip (1), a portion of which is tightly attached to the aircraft skin via conductive adhesive, and another portion of which is arranged on the push lock buckle (3); The surface of the push lock buckle (3) is sprayed with an electrostatic coating and is connected to the high-resistance bridging strip (1) by electrostatic conduction; The process of using a discharge device to discharge static electricity on a fixed-wing stealth aircraft includes: After the aircraft skin generates electrostatic charge, the electrostatic charge is conducted to the push lock (3) through the high-resistance strap (1), and then the push lock (3) is conducted to the discharge column (4), and then concentrated to the discharge tip of the discharge column (4), and breakdown discharge occurs between the discharge tip and water molecules in the air or cloud layer.

2. The electrostatic discharge method for a fixed-wing stealth aircraft according to claim 1, characterized in that: The high-resistance overlapping strips (1) include at least two, and the at least two high-resistance overlapping strips (1) are overlapped and fixed to the push lock buckle (3) at the overlapped portion by means of screws (2).

3. The electrostatic discharge method for a fixed-wing stealth aircraft according to claim 1, characterized in that: The high-resistance strap (1) and the push lock buckle (3) jointly form a high-resistance path.

4. The electrostatic discharge method for a fixed-wing stealth aircraft according to claim 1, characterized in that: The resistance of the high-resistance strap (1) is 6 to 200 MΩ.

5. The electrostatic discharge method for a fixed-wing stealth aircraft according to claim 1, characterized in that: The high-resistance strap (1) is a flexible non-metallic high-resistance strap.

6. The electrostatic discharge method for a fixed-wing stealth aircraft according to claim 1, characterized in that: One end of the discharge column (4) connected to the push lock buckle (3) is provided with a groove in the circumferential direction, and the groove and the push lock buckle (3) are self-locking; The discharge tip of the discharge column (4) is in the form of a frustum, and is used to discharge deposited static electricity.

7. The electrostatic discharge method for a fixed-wing stealth aircraft according to claim 1, characterized in that: The push lock buckle (3) is an automatically rebound push self-locking lock buckle.

Images