Study on the parameters influence of ground resonance on three-dimensional blade rotor of helicopter

In response to the current advanced rotor configuration with complex three-dimensional shapes, this configuration effectively improves aerodynamic performance, reduces noise, and greatly increases helicopter flight speed, while also having a certain impact on helicopter ground resonance stability. However, there is still limited research in this area. On the basis of modeling the coupled dynamics model of a three-dimensional shaped rotor and the body, this article studies the influence of the three-dimensional shaped rotor configuration (forward and backward sweep angle, upper and lower reversal angle) on ground resonance. The results indicate that the forward sweep angle and upward thrust angle of the propeller tip have adverse effects on ground resonance, while the backward sweep angle and downward thrust angle increase the stability margin. Reasonable design of complex three-dimensional blade tip configurations can improve ground resonance stability boundary. However, the influence of the three-dimensional shape of the propeller tip configuration is minimal and not significant in general, mainly reflected in the small contribution of the aerodynamic effects brought by the propeller tip to ground resonance.