Research on Influence of Dynamic Balance Deviation on Blade Static Stiffness and Airframe Vibration

During the maintenance and adjustment process of a helicopter blade returning to the factory, the dynamic balance parameters are often deviated and the blades cannot be delivered to users on time. In this paper, the influence of dynamic balance deviation on blade static stiffness properties and airframe vibration level are studied by means of simulation and test. The research shows that the maximum difference of the static stiffness properties between the dynamic balance deviated blade and the qualified one is 7.62%, which appears at the torsional stiffness. The maximum vertical vibration at the key airframe parts of the helicopter equipped with the deviated blade is 0.19g, and the pilot reflects the body feeling well. From the perspective of static stiffness property and airframe vibration level, the dynamic balance deviated blade can be delivered for use.