ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Effect of Helicopter Rotor Blade Shape on Its Radar Signal Characteristics
Received date: 2013-12-18
Revised date: 2014-04-16
Online published: 2014-04-25
Supported by
Priority Academic Program Development of Jiangsu Higher Education Institutions
The time-frequency domain analyses about rotor blade shape on its signal echo characteristics combining the physical optics method, the equivalent currents method and the quasi-stationary method have been investigated. Firstly, the effects and response characteristics of the rotor radar cross section (RCS) with multi factors such as airfoil parameters, blade-tip backward swept and anhedral have been carried out. Then time-frequency domain changes of echo signal of rotor about different blade numbers and blade-tip swept angle have been presented, as a result, the scattering reduced blade number choice and strong scattering regions are obtained. Simultaneously, moment and times of rotor RCS flash are discovered and extracted from time-frequency domain information grayscale. It shows that blade-tip backwara swept is one of the important and strong scattering sources. Comparing 3 or 5 blades with 4 blades rotor, the peak of rotor RCS can be reduced by 2.32 dB·m2 or 2.52 dB·m2 respectively, which is conducive to control peak of rotor RCS. The maximum radar detecting distances about RCS peak value of rotor with NACA0006 airfoil are 38.6% and 41.8% of that of rotor with NACA0024 airfoil respectively, providing the best comprehensive stealth performances.
JIANG Xiangwen , ZHAO Qijun , MENG Chen . Effect of Helicopter Rotor Blade Shape on Its Radar Signal Characteristics[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(11) : 3123 -3136 . DOI: 10.7527/S1000-6893.2014.0060
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