Aircraft elevator buzzing suppressor based on fluid-solid coupling effect

Abstract

The invention discloses an aircraft elevator buzzing suppressor based on a fluid-solid coupling effect, and belongs to the field of buzzing suppressors. The aircraft elevator buzzing suppressor comprises a base, a manganese steel sheet, a viscoelastic damping strip and a mass block, the base is fixed on the inner wall surface of the elevator skin; one end of the manganese steel sheet is verticallyfixed to the side wall of the vertical beam through a connecting piece, and the mass block is fixed to the other end of the manganese steel sheet and can do up-down reciprocating sinking and floatingmotion. And the viscoelastic damping strips are adhered to the upper surface and the lower surface of the manganese steel sheet. When the elevator generates buzz, the manganese steel sheet is repeatedly bent and deformed, the mass block at the free end does up-down reciprocating sinking and floating motion, the fluid-solid coupling effect is utilized, and when the frequency of external carrier aerodynamic force is coupled with the frequency of the suppressor, the stability boundary of the elevator is changed, and the frequency range of buzz generation is narrowed. The viscous-elastic dampingstrip 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 can be effectively prolonged.

Description

technical field [0001] The invention belongs to the field of hum suppressors, in particular to an aircraft elevator hum suppressor based on the fluid-solid coupling effect. Background technique [0002] Humming is a kind of periodic equal-amplitude or divergent amplitude oscillation of the elevator around its hinge axis when the aircraft is flying at transonic speed, which is a self-excited vibration. When the elevator hums, it will reduce the efficiency of the elevator, and in severe cases, it will cause the rudder surface to 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 w...

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Problems solved by technology

However, this method will destroy the appearance of the lifting surface, so it is not feasible in engineering practice

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