Passive aileron buzzing stability augmenter based on fluid-solid coupling effect

Abstract

The invention discloses a passive aileron buzzing stability augmenter based on a fluid-solid coupling effect. The stability augmenter is used for solving the technical problem that an existing passiveaileron buzzing suppression mechanism is poor in practicability. The stability augmenter comprises a base, a connecting piece, a mass block, a manganese steel sheet and viscoelastic damping strips. The base is connected with a rib plate inside an aileron through a bolt, one end of the manganese steel sheet is connected to the base, the other end of the manganese steel sheet is connected to the mass block, and the viscoelastic damping strips are longitudinally adhered to the upper surface and the lower surface of the manganese steel sheet along the manganese steel sheet. When the aileron buzzes, the manganese steel sheet is repeatedly bent and deformed, the mass block at the free end reciprocates up and down, when the frequency of the external carrier aerodynamic force is coupled with thefrequency of the stability augmenter, the stability boundary of the aileron is changed, the frequency range of buzzing is reduced, part of mechanical energy consumption is dissipated through repeatedstretching and contracting movement of the viscouselastic damping strips, the amplitude of buzzing is reduced, the fatigue life of the structure is prolonged, and the practicability is good.

Description

technical field [0001] The invention relates to a passive aileron hum suppression mechanism, in particular to a passive aileron hum stabilizer based on the fluid-solid coupling effect. Background technique [0002] Humming is a kind of periodic constant-amplitude or divergent-amplitude oscillation of the aileron around its hinge axis when the aircraft is flying at transonic speed, which is a self-excited vibration. When the aileron buzzes, the efficiency of the aileron 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 othe...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of poor practicability of the existing passive aileron hum suppression mechanism, the present invention provides a passive aileron hum stabilizer based on the fluid-solid coupling effect

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