【摘要】 建立某直升机武器外挂的外形模型,采用物理光学法和等效电磁流法计算了武器外挂在HH极化、2~18GHz频率的RCS特性。进行武器外挂RCS减缩研究,提出了直升机武器外挂整形罩的隐身设计方法,将原武器外挂在4个波段、三个重要方向下的RCS水平从1.5m~2~18.6m~2降低到0.004 m~2~0.06 m~2,减缩量达23~40dB,有效降低了其在主要散射方向上的雷达散射水平。分析了改型前后的气动特性,保证了改型对直升机的气动性能影响较小。更多还原

【Abstract】 It was established for a outline model of helicopter external stores,and the physical optics and the equivalent currents theory were used to calculate the RCS of the external stores. It was put forward that the stealth design method of outline shaping cover for helicopter RCS reduction in three important direction. The average RCS of the external weapon store has been reduced form1. 5m~2~ 18. 6 m~2 to 0. 004m~2~ 0. 05m~2 at four frequency band. The RCS reduction value reaches to 23 ~ 40 dB. By analysis of CFD,the aerodynamic drag of the external stores has no significantly increase.更多还原