Rudder buzzing suppressor based on fluid-solid coupling effect

Abstract

The invention discloses a rudder buzzing suppressor based on a fluid-solid coupling effect, and belongs to the field of buzzing suppressors. The rudder buzzing suppressor comprises a base, a manganesesteel sheet, a viscoelastic damping strip and a mass block, the base is of an I-shaped beam structure, and cross beams at the two ends of the base are fixed to the inner wall face of rudder skin through bolts. The manganese steel sheet is of a rectangular structure, one end of the long edge is vertically fixed on the supporting beam of the base through a connecting piece, and a mass block is fixed at the other end; and the viscoelastic damping strips are adhered to the upper surface and the lower surface of the manganese steel sheet. When the rudder is buzzed, the manganese steel sheet is repeatedly bent and deformed, the mass block at the free end does up-and-down reciprocating sinking and floating motion, the fluid-solid coupling effect is utilized, when the frequency of external carrier aerodynamic force is coupled with the frequency of the suppressor, the stability boundary of the rudder is changed, and the buzzing frequency range is narrowed. The viscous-elastic damping strip dissipates a part of mechanical energy consumption of vibration through repeated stretching and contracting movement, the vibration amplitude during buzzing is reduced, and the fatigue life of the structure is effectively prolonged.

Description

technical field [0001] The invention belongs to the field of buzzing suppressors, in particular to a rudder buzzing suppressor based on the fluid-solid coupling effect. Background technique [0002] Humming is a kind of periodic constant amplitude or divergent amplitude oscillation of the rudder around its hinge axis when the aircraft is flying at transonic speed, which is a self-excited vibration. When the rudder buzzes, the efficiency of the rudder will be reduced, and in severe cases, the rudder surface will fail or even be destroyed. In the project, there are some suggestions for preventing humming: use simple and sufficient mechanical damping to offset the negative aerodynamic damping; increase the rotation frequency of the control surface; in terms of aerodynamic design, use a hinge axis with a large sweep angle, a spanner Smaller lift surface, favorable wing section form and control surface with blunt trailing edge or modified trailing edge in other ways to reduce sh...

AI Technical Summary

Problems solved by technology

However, this method will destroy the appearance of the lift surface, affect the aerodynamic effect of the lift surface, and increase the resistance of the lift surface

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