Lateral broadband stealth design method for missile body of patrol missile

Abstract

The invention belongs to the technical field of stealth design of patrol projectiles, and particularly relates to a lateral broadband stealth design method of a patrol projectile body. Aiming at the problem of lateral stealth of the patrolling projectile, a broadband stealth scheme is designed in the lateral direction of a patrolling projectile body based on low radar cross section (RCS) shape design and stealth structure material technology, a combined design method of a double-dip-angle low RCS shape and a wave-absorbing projectile body structure is adopted, low RCS design is achieved under multiple constraints of shape, pneumatics, structure, weight, bearing and the like, and a wide-band stealth scheme is designed in the lateral direction of the patrolling projectile body. The RCS mean value of the missile body in the S, C and X wave bands in the lateral direction is reduced by more than two orders of magnitude, and the lateral stealth performance of the patrol missile is greatly improved. According to the lateral broadband stealth design method for the missile body of the patrolling missile, the designed missile body has the characteristics of high strength, outstanding stealth performance, light weight and the like, a stable and excellent stealth effect can be provided in the S, C and X broadband domain range, and the high stealth requirement of the novel patrolling missile is met.

Description

Technical Field

[0001] The invention belongs to the technical field of stealth design of cruise missiles, and in particular relates to a lateral broadband stealth design method for a cruise missile body. Background Art

[0002] Stealth technology, also known as low-detectable technology or target characteristic signal control technology, is a technology that controls or reduces the characteristic signals of weapon systems such as radar, infrared, light, electricity, and magnetism, making it difficult for enemy detection systems to detect / intercept, identify, track, and attack by enemy firepower systems. With the rapid development of radar detection technology and the continuous upgrading of anti-missile defense systems, the battlefield survivability of aircraft equipment such as cruise missiles and drones has been greatly threatened, seriously affecting the effective combat strike capability of the equipment. Stealth design and processing of equipment can effectively reduce the probability of equipment being detected by enemy detection systems, and can greatly improve the battlefield survivability of equipment.

[0003] Cruise missiles are a new type of cutting-edge equipment that has developed rapidly in recent years. They can be used as attack equipment to achieve deep damage to the enemy, and can also be used as an aerial relay combat platform, which can effectively expand the combat radius of small cruise missiles, drones and other equipment. However, traditional cruise missile equipment lacks stealth design, resulting in strong radar scattering characteristics, which can easily be discovered and locked by enemy radar detection systems when fighting against the enemy. Large-sized cruise missiles have a larger length and caliber. Compared with traditional small cruise missiles, they have larger physical dimensions and stronger radar scattering characteristics, and are in urgent need of strong stealth processing. However, there is currently little related research work in China, and there is a lack of effective low RCS stealth design methods for large-sized cruise missiles. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the present invention is: how to provide a method for designing lateral broadband stealth of a cruise missile body, solve the problems of strong radar scattering characteristics, difficult broadband stealth, and easy detection and reconnaissance of cruise missiles, and meet the urgent demand for high stealth performance of new cruise missiles.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a method for designing lateral broadband stealth of a cruise missile body, the method comprising the following steps:

[0008] Step S1: design of low RCS shape of missile body sideways;

[0009] Step S2: Design of a lateral broadband stealth solution for the missile body;

[0010] Step S3: sandwich absorbing structure scheme design;

[0011] Step S4: Design of wave-absorbing skin stealth scheme.

[0012] Wherein, in the step S1, a lateral low RCS shape design of the missile body is performed;

[0013] Based on the constraints of the cruise missile's flight control, aerodynamic environment, stealth requirements, etc., the outer surfaces on both sides of the missile body are designed as a "double-inclined" shape structure, and the overall missile body is a hexagonal cylindrical structure.

[0014] Wherein, in the step S2, a lateral broadband stealth scheme of the missile body is designed;

[0015] According to the stress load and stealth technical requirements of the cruise missile, the missile body is designed with regional multi-structures, in which a sandwich absorbing composite structure is used on both sides of the missile body, and a wave-absorbing stealth skin is used on the upper and lower surfaces of the missile body. The structural size parameters and stealth performance parameters of different areas of the missile body are designed with constraints based on the stress environment and mechanical interface requirements.

[0016] Wherein, in the step S3, a sandwich absorbing structure scheme is designed;

[0017] The two sides of the projectile are designed with a sandwich absorbing composite structure, which includes a resistive film, a wave-transmitting honeycomb, and an aluminum foil from the outer surface to the inner surface. The composition and material parameters of the sandwich absorbing composite structure are regulated and designed according to the design constraints in step S2.

[0018] Wherein, in said step S4, a wave-absorbing skin stealth scheme is designed;

[0019] The upper and lower surfaces of the projectile are designed with absorbing stealth skins. The absorbing stealth skins are designed as a multi-layer structure consisting of absorbing structural layers and conductive shielding layers alternately laminated with reinforced composite materials and absorbing materials. The composition and material parameters of the absorbing stealth skins are regulated and designed according to the design constraints in step S2.

[0020] Wherein, in the step S1, the angle between the outer surfaces of both sides of the projectile and the vertical direction is 5° to 12°.

[0021] Wherein, in said step S2, the thickness of the interlayer wave-absorbing composite structure on both sides of the projectile is 6 mm to 11 mm, and the thickness of the wave-absorbing stealth skin on the upper and lower surfaces of the projectile is 2 mm to 5 mm.

[0022] Wherein, in the step S3, the surface resistance of the resistance film of the sandwich wave absorbing composite structure on both sides of the elastic body is 50Ω / sq~160Ω / sq;

[0023] The two sides of the projectile are sandwiched with a wave-absorbing composite structure, and the wave-transmitting honeycomb is one of an aluminum honeycomb, a glass fiber / epoxy composite honeycomb, and a polyetheretherketone honeycomb.

[0024] Wherein, in the step S4, the upper and lower surfaces of the missile body are provided with absorbing stealth skins, and the absorbing structure layer thereof has a total of (n+1) layers of reinforced composite materials and a total of n layers of absorbing materials; further preferably, the value of n is 5 to 10 layers;

[0025] The upper and lower surfaces of the missile body are radar-absorbing stealth skins, and the reinforced composite material in the radar-absorbing structural layer is a glass fiber or carbon fiber reinforced resin-based composite material, and the resin used is one of epoxy resin, bismaleimide resin, and cyanate resin;

[0026] The upper and lower surfaces of the missile body are covered with wave-absorbing stealth skins, and the wave-absorbing material in the wave-absorbing structural layer is a glass fiber / epoxy composite material with an absorbent added, and the absorbent used is one of carbonyl iron, carbon nanotubes, and nano nickel powder; the amount of the absorbent added is 5% to 10%;

[0027] Among them, in step S4, the upper and lower surfaces of the projectile are covered with radar-absorbing stealth skin, and its conductive shielding layer is one of aluminum foil, copper foil and tin foil.

[0028] (III) Beneficial effects

[0029] Compared with the prior art, the present invention provides a lateral broadband stealth design method for a cruise missile body. The stealth missile body adopts a combination design method of a stealth shape design and an absorbing structure. Through the "double-angle" stealth shape design, the radar electromagnetic wave is transformed from forward reflection to backward reflection, which greatly reduces the echo intensity under the detectable angle domain; according to the constraints such as the flight control of the missile body, the aerodynamic environment and the load requirements, the upper and lower surfaces and both sides of the missile body respectively use absorbing stealth skins and sandwich absorbing composite structures of different thicknesses and characteristics as structural materials. By regulating and optimizing the internal composition of the material, while ensuring the structural strength of the missile body, the radar electromagnetic wave scattering intensity of the missile body is further reduced; through the combination design of the "double-angle" stealth shape and the absorbing structure, the technical difficulties of the low RCS design of large-size components are broken through. The broadband stealth composite body of the cruise missile of the present invention has the characteristics of high strength, outstanding stealth performance, light weight, etc., and can provide stable and excellent stealth effects within the S, C, and X wide frequency domains, meeting the high stealth requirements of new cruise missiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the appearance of the wide-band stealth composite material body of the cruise missile.

[0031] Figure 2 This is a schematic diagram of the cross-section of the cruise missile's broadband stealth composite body.

[0032] Figure 3 This is a schematic diagram of the radar-absorbing stealth skin structure on the upper and lower surfaces of the wide-band stealth composite material body of the cruise missile.

[0033] Figure 4This is a schematic diagram of the composite structure of the absorbing sandwich layers on both sides of the wide-band stealth composite material body of the cruise missile. DETAILED DESCRIPTION

[0034] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0035] In order to solve the above technical problems, the present invention proposes a lateral broadband stealth design method for a cruise missile body. The technical scheme is as follows: adopting a "double-inclination" stealth shape design, compared with the traditional cylindrical or square structure, the "double-inclination" hexagonal shape structure can effectively deflect the reflection direction of radar waves and greatly reduce the radar scattering cross-sectional area; the missile body is designed as a high-strength absorbing material body. Compared with metal or non-absorbing composite materials, high-strength absorbing materials can absorb a large proportion of electromagnetic waves projected on the surface, while ensuring the structural strength of the missile body, further reducing the intensity of reflected radar waves; according to the constraints of the flight control, aerodynamic environment and load requirements of the missile body, the high-strength absorbing material of the missile body is regionalized, and the sandwich absorbing composite structure is adopted on both sides of the missile body, and the upper and lower surfaces of the missile body adopt the absorbing stealth skin structure. Through the combined design method of stealth shape and absorbing structure, the problem of strong radar scattering characteristics and difficult broadband stealth of cruise missiles is solved, and a missile body structure design method with strong stealth characteristics in a wide frequency domain is provided for new high-stealth cruise missiles.

[0036] Specifically, the present invention provides a method for designing lateral broadband stealth of a cruise missile body, the method comprising the following steps:

[0037] Step S1: design of low RCS shape of missile body sideways;

[0038] Step S2: Design of a lateral broadband stealth solution for the missile body;

[0039] Step S3: sandwich absorbing structure scheme design;

[0040] Step S4: Design of wave-absorbing skin stealth scheme.

[0041] Wherein, in the step S1, a lateral low RCS shape design of the missile body is performed;

[0042] Based on the constraints of the cruise missile's flight control, aerodynamic environment, stealth requirements, etc., the outer surfaces on both sides of the missile body are designed as a "double-inclined" shape structure, and the overall missile body is a hexagonal cylindrical structure.

[0043] Wherein, in the step S2, a lateral broadband stealth scheme of the missile body is designed;

[0044] According to the stress load and stealth technical requirements of the cruise missile, the missile body is designed with regional multi-structures, in which a sandwich absorbing composite structure is used on both sides of the missile body, and a wave-absorbing stealth skin is used on the upper and lower surfaces of the missile body. The structural size parameters and stealth performance parameters of different areas of the missile body are designed with constraints based on the stress environment and mechanical interface requirements.

[0045] Wherein, in the step S3, a sandwich absorbing structure scheme is designed;

[0046] The two sides of the projectile are designed with a sandwich absorbing composite structure, which includes a resistive film, a wave-transmitting honeycomb, and an aluminum foil from the outer surface to the inner surface. The composition and material parameters of the sandwich absorbing composite structure are regulated and designed according to the design constraints in step S2.

[0047] Wherein, in said step S4, a wave-absorbing skin stealth scheme is designed;

[0048] The upper and lower surfaces of the projectile are designed with absorbing stealth skins. The absorbing stealth skins are designed as a multi-layer structure consisting of absorbing structural layers and conductive shielding layers alternately laminated with reinforced composite materials and absorbing materials. The composition and material parameters of the absorbing stealth skins are regulated and designed according to the design constraints in step S2.

[0049] Wherein, in the step S1, the angle between the outer surfaces of both sides of the projectile and the vertical direction is 5° to 12°.

[0050] Wherein, in said step S2, the thickness of the interlayer wave-absorbing composite structure on both sides of the projectile is 6 mm to 11 mm, and the thickness of the wave-absorbing stealth skin on the upper and lower surfaces of the projectile is 2 mm to 5 mm.

[0051] Wherein, in the step S3, the surface resistance of the resistance film of the sandwich wave absorbing composite structure on both sides of the elastic body is 50Ω / sq~160Ω / sq;

[0052] The two sides of the projectile are sandwiched with a wave-absorbing composite structure, and the wave-transmitting honeycomb is one of an aluminum honeycomb, a glass fiber / epoxy composite honeycomb, and a polyetheretherketone honeycomb.

[0053] Wherein, in the step S4, the upper and lower surfaces of the missile body are provided with absorbing stealth skins, and the absorbing structure layer thereof has a total of (n+1) layers of reinforced composite materials and a total of n layers of absorbing materials; further preferably, the value of n is 5 to 10 layers;

[0054] The upper and lower surfaces of the missile body are radar-absorbing stealth skins, and the reinforced composite material in the radar-absorbing structural layer is a glass fiber or carbon fiber reinforced resin-based composite material, and the resin used is one of epoxy resin, bismaleimide resin, and cyanate resin;

[0055] The upper and lower surfaces of the missile body are covered with wave-absorbing stealth skins, and the wave-absorbing material in the wave-absorbing structural layer is a glass fiber / epoxy composite material with an absorbent added, and the absorbent used is one of carbonyl iron, carbon nanotubes, and nano nickel powder; the amount of the absorbent added is 5% to 10%;

[0056] Among them, in step S4, the upper and lower surfaces of the projectile are covered with radar-absorbing stealth skin, and its conductive shielding layer is one of aluminum foil, copper foil and tin foil.

[0057] Example 1

[0058] According to the constraints of cruise missile flight control, aerodynamic environment, stealth requirements, etc., a large-sized cruise missile stealth body is designed. The outer surface of the body on both sides has an angle of 6° with the vertical direction, and the body is hexagonal in structure. The two sides of the body adopt a sandwich absorbing composite structure, which is a resistor film, a wave-transmitting aluminum honeycomb and an aluminum foil from the outer surface to the inside, with a total thickness of 10.6mm. The upper and lower surfaces of the body adopt an absorbing stealth skin structure. The skin is composed of an absorbing structural layer and an aluminum foil. The absorbing structural layer is composed of 6 layers of carbon fiber / epoxy composite materials and 5 layers of glass fiber / epoxy absorbing composite materials with 10% carbon nanotubes added alternately. The total thickness of the absorbing stealth skin is 2.3mm.

[0059] Example 2

[0060] According to the constraints of cruise missile flight control, aerodynamic environment, stealth requirements, etc., a large-sized cruise missile stealth body is designed. The outer surfaces on both sides of the body have an angle of 9° with the vertical direction, and the body is hexagonal in structure. The two sides of the body adopt a sandwich absorbing composite structure, which is composed of a resistive film, a wave-transmitting polyetheretherketone honeycomb and aluminum foil from the outer surface to the inside, with a total thickness of 6.1mm. The upper and lower surfaces of the body adopt an absorbing stealth skin structure. The skin consists of an absorbing structural layer and copper foil. The absorbing structural layer is composed of 11 layers of carbon fiber / bismaleimide composite materials and 10 layers of glass fiber / epoxy absorbing composite materials with 5% carbonyl iron added alternately laminated. The total thickness of the absorbing stealth skin is 4.8mm.

[0061] Example 3

[0062] According to the constraints of cruise missile flight control, aerodynamic environment, stealth requirements, etc., a large-sized cruise missile stealth body is designed. The outer surface of the body on both sides has an angle of 12° with the vertical direction, and the body is hexagonal in structure. The two sides of the body adopt a sandwich absorbing composite structure, which is composed of a resistive film, a wave-transmitting glass fiber / epoxy composite honeycomb and aluminum foil from the outer surface to the inside, with a total thickness of 8.4mm. The upper and lower surfaces of the body adopt an absorbing stealth skin structure. The skin consists of an absorbing structural layer and tin foil. The absorbing structural layer is composed of 8 layers of glass fiber / cyanate composite material and 7 layers of glass fiber / epoxy absorbing composite material with 8% nano nickel powder added alternately laminated. The total thickness of the absorbing stealth skin is 3.2mm.

[0063] Comparative Example 1

[0064] A cruise missile aluminum alloy body has an overall rectangular structure, two sides of the body are 8mm thick aluminum alloy structures, and the upper and lower surfaces of the body are 3mm thick aluminum alloy structures.

[0065] The RCS of the large-size cruise missile body of the above-mentioned embodiments and comparative examples was tested. The specific performance test results are shown in Table 1.

[0066] Table 1 RCS test results of cruise missiles of various embodiments and comparative examples (azimuth angle 90°±60°)

[0067]

[0068] It can be seen from Table 1 that the wide-band stealth composite body of a cruise missile proposed in the present invention has outstanding stealth performance, and its RCS is reduced by more than 10dB compared with the traditional metal body structure without stealth design.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for designing lateral broadband stealth of a cruise missile body, characterized in that: The method comprises the following steps: Step S1: design of low RCS shape of missile body sideways; Step S2: Design of a lateral broadband stealth solution for the missile body; Step S3: sandwich absorbing structure scheme design; Step S4: Design of wave-absorbing skin stealth scheme.

2. The method for designing lateral broadband stealth of a cruise missile body as claimed in claim 1, characterized in that: In the step S1, a low RCS shape design of the missile body is performed; Based on the constraints of the cruise missile's flight control, aerodynamic environment, stealth requirements, etc., the outer surfaces on both sides of the missile body are designed as a "double-angle" shape structure, and the overall missile body is a hexagonal cylindrical structure.

3. The method for designing lateral broadband stealth of a cruise missile body as claimed in claim 2, characterized in that: In the step S2, a lateral broadband stealth scheme for the missile body is designed; According to the stress load and stealth technical requirements of the cruise missile, the missile body is designed with regional multi-structures, in which a sandwich absorbing composite structure is used on both sides of the missile body, and a wave-absorbing stealth skin is used on the upper and lower surfaces of the missile body. The structural size parameters and stealth performance parameters of different areas of the missile body are designed with constraints based on the stress environment and mechanical interface requirements.

4. The method for designing lateral broadband stealth of a cruise missile body as claimed in claim 3, characterized in that: In the step S3, a sandwich absorbing structure scheme is designed; The two sides of the projectile are designed with a sandwich absorbing composite structure, which includes a resistive film, a wave-transmitting honeycomb, and an aluminum foil from the outer surface to the inner surface. The composition and material parameters of the sandwich absorbing composite structure are regulated and designed according to the design constraints in step S2.

5. The method for designing lateral broadband stealth of a cruise missile body as claimed in claim 4, characterized in that: In the step S4, a wave-absorbing skin stealth scheme is designed; The upper and lower surfaces of the projectile are designed with absorbing stealth skins. The absorbing stealth skins are designed as a multi-layer structure consisting of absorbing structural layers and conductive shielding layers alternately laminated with reinforced composite materials and absorbing materials. The composition and material parameters of the absorbing stealth skins are regulated and designed according to the design constraints in step S2.

6. The method for designing lateral broadband stealth of a cruise missile body as claimed in claim 5, characterized in that: In the step S1, the angle between the outer surfaces of both sides of the projectile and the vertical direction is 5° to 12°.

7. The method for designing lateral broadband stealth of a cruise missile body as claimed in claim 6, characterized in that: In step S2, the thickness of the interlayer absorbing composite structure on both sides of the projectile is 6mm to 11mm, and the thickness of the absorbing stealth skin on the upper and lower surfaces of the projectile is 2mm to 5mm.

8. The method for designing lateral broadband stealth of a cruise missile body as claimed in claim 7, characterized in that: In the step S3, the surface resistance of the resistance film of the sandwich wave absorbing composite structure on both sides of the elastic body is 50Ω / sq~160Ω / sq; The two sides of the projectile are sandwiched with a wave-absorbing composite structure, and the wave-transmitting honeycomb is one of an aluminum honeycomb, a glass fiber / epoxy composite honeycomb, and a polyetheretherketone honeycomb.

9. The method for designing lateral broadband stealth of a cruise missile body as claimed in claim 8, characterized in that: In the step S4, the upper and lower surfaces of the projectile are covered with absorbing stealth skin, and the absorbing structure layer thereof has a total of (n+1) layers of reinforced composite material and a total of n layers of absorbing material; further preferably, the value of n is 5 to 10 layers; The upper and lower surfaces of the missile body are radar-absorbing stealth skins, and the reinforced composite material in the radar-absorbing structural layer is a glass fiber or carbon fiber reinforced resin-based composite material, and the resin used is one of epoxy resin, bismaleimide resin, and cyanate resin; The upper and lower surfaces of the projectile are covered with absorbing stealth skins, and the absorbing material in the absorbing structure layer is a glass fiber / epoxy composite material with an absorbent added. The absorbent used is one of carbonyl iron, carbon nanotubes, and nano nickel powder; the amount of absorbent added is 5% to 10%.

10. The method for designing lateral broadband stealth of a cruise missile body as claimed in claim 9, characterized in that: In step S4, the upper and lower surfaces of the projectile are covered with radar-absorbing stealth skin, and the conductive shielding layer thereof is one of aluminum foil, copper foil and tin foil.

Images