夹芯结构吸波隐身性能分析-analysis of wave-absorbing stealth performance of sandwich structure.docxVIP

AbstractWith the continuous development of radar technology, radar stealth technology has increasingly become an important factor for the survival of weapons systems such as aircraft, ships. Compared with traditional metal structures, sandwich composite structure is widely used in these weapons systems .On one hand , Sandwich composite have many excellent mechanical properties, such as lightweight, high strength .On the other hand, it is very suitable for stealth design . For these reasons, research and design of the stealth performance of the sandwich structure has very important significance.This paper first introduces the basic definition of radar cross section and the fundamental theorem of electromagnetic wave propagation. Based on these researchers ,the basic theorem of electromagnetic wave reflection in multilayer medium was achieved. Furthermore, the basic principle of structural wave absorbing design was also founded. Besides the basic material property requirement of each layer was achieved. And then the radar cross section of metal ball with exact solution and the metal plate coating structure with experimental results were calculated by FEKO software. The accuracy of FEKO was verified by comparing the calculation results with the exact solution and the experimental value .Secondly, the radar scattering characteristic of corrugated sheets was researched by FEKO. Corrugated sheets take structural radar absorbing design and the wave-transparent layer used glass fiber while the wick of corrugated sheet used glassfiber impregnated absorbing materials. The bottom plate was metal. By changing the thickness wick height and corrugated wick angle of the corrugated board panel, the radar cross section in the three frequency was achieved.Finally, the radar cross section of the honeycomb structure in different cellular height, panel thickness, honeycomb wall thickness was calculated. By comparing thereresults, the regular how those geometric factors concerned before