直升机旋翼涂敷吸波材料减缩RCS试验研究

翼面类部件的RCS减缩始终是飞行器隐身研究的重要课题,在微波暗室对某直升机旋翼金属模型和涂敷吸波材料模型进行测试研究。在金属旋翼模型表面涂敷1 mm厚吸波材料,可以在8~18 GHz、HH极化下,将其RCS的峰值减缩5~8 dB,360°周向算术均值减缩约5 dB,充分利用了所用吸波材料平板试件法向减缩量8~11 dB的性能,减缩效果十分明显。而在VV极化,除了前缘RCS峰值的减缩量能达到3~5 dB外,后缘RCS峰值和周向RCS算术均值的减缩量均很小。研究结果对于翼面类部件的RCS减缩具有重要参考价值。

Test Research on RCS Reduction of Coating RAM for Helicopter Blades

RCS（Radar Cross Section） reduction of wing type components is an important issue for aircraft stealth design. The test on high frequency backscattering by a helicopter metal model blade and a model blade coated with radar absorbing material （RAM） were carded in the anechoic chamber. For horizontal polarization （HH）, at frequency between 8~18 GHz, blade coated with 1 mm thick RAM compared with a metal one, the peak RCS was reduced by 5~8 dB and the arithmetic average RCS around 00-360~ was reduced by 5 dB. The reflective performance of plates coated with RAM is no more than 8-11 dB was full used. For VV polarization, the peak RCS of the leading edge was reduced by 3-5 dB, but the reducing shrinkage of the tail edge and the arithmetic average RCS around 0°-360° was a few. The result has important reference value for RCS reduction of the wing components.