Cruise Missiles, Radar Absorbing Structure Of Wing Design And Pilot Study

Missile wing is one of the most important scattering sources in the head-on direction of cruise missile. In order to improve the attack-action ability and combat efficiency of cruise missile, stealth measure is needed to reduce the scattering intensity of the missile wing. Wave-absorbing structure is a kind of multifunctional composite not only to carry load but to absorb radar waves, which acts as an effective technical path for missile stealth. This thesis intends to carry out the sizing and the materials design of the wave absorbing structure through numerical computation and experimental test. The research work contents cover as follows:1. With help of the algorithmic theories and computer-aided-engineering software of electro-magnetic numerical computation, the RCS magnitude and distribution of the wing and whole outer configuration of some cruise missile are obtained, which indicates that missile wing's RCS mainly comes from mirror-reflection of missile wing's leading-edge, diffraction of leading-edge and trailing-edge, as well as coupling effect between missile wing and missile body. This work lays a necessary foundation to design the wave-absorbing structure of the missile wing.2. Based on the study of various stealth techniques with their characteristics, such as wave-absorbing laminated composite, foam-core sandwich and honeycomb sandwich structures, meanwhile considering material strength restrictions, a hard quality type foam sandwich structure is adopted to reduce the RCS of the missile wing. After comparing two different foam sandwich structural schemes, the scenario of metallic boxed beam, glass fiber-reinforced laminate skin cored with hard quality foams is designed.3. With the restrictions of structural strength and stiffness, the foregoing scheme is finally sized and optimized for its metallic boxed beam, glass fiber reinforced laminate and foam material for the wave-absorbing missile wing.4. A full scaled RCS test for the absorbing structure wing is conducted to verify its stealth performance. The RCS test results indicate that the absorbing structural wing has preferable effect to reduce the RCS of missile wing from 2.6GHz to 18GHz.In conclusion, the foam sandwich structural wing can reduce the RCS of missile wing and meet the requirements for strength and stiffness of cruise missile, and the foam sandwich structural configuration is a kind of effective technical path to reduce the RCS of cruise missile wing.