关键词: 旋翼, 雷达散射截面, 物理光学法, 等效电磁流法, 准静态法

Abstract: This paper seeks to explore the influence of the rotary motion, variable-pitch, flapping and sloping of helicopter rotating blades on the dynamic RCS behavior in the aspects of time and frequency domains respectively. Based on the NACA0012 aerofoil, a geometric model of helicopter rotating blades is established for the dynamic RCS computation. By means of the physical optic (PO) and the equivalent currents methods (ECM), the RCS time domain curves of helicopter rotating blades are calculated in the cases of various motions. And then, the mean Doppler spectrum in a cycle is computed using the quasi-static method. A continuous instantaneous time spectrum is analyzed to conclude some valuable results for the engineering design of helicopter rotating blades

Key words: helicopter rotating blade, radar cross section (RCS), physical optic (PO), equivalent currents methods (ECM), quasi-static method