Free flight supporting device in full wingspan flying wing body freedom flutter wind tunnel test

Abstract

The invention provides a free flight supporting device in a full wingspan flying wing body freedom flutter wind tunnel test. The device comprises a cross beam, a pulley block and a steel shaft. A flying wing model is connected with the pulley block through the cross beam, the cross beam is connected with the pulley block through a bearing, the relative rotation of the pulley block and a beam is not affected, the pitching degrees of freedom of a flying wing is released in the experiment process, the pulley block is driven to move up and down through the cross beam, the sinking and floating degrees of freedom of the model is released, and meanwhile, a displacement limiter is further arranged and used for limiting the up-and-down movement of the model and preventing the model from being dispersed or damaged due to violent oscillation. The flying wing and the pulley block are connected by the cross beam, so that the frictional resistance is reduced, a supporting spring is not required to be designed independently, the sinking and floating degrees of freedom and the pitching degrees of freedom can be released simultaneously, the device has the advantage of easiness in implementation, and the influence of the bearing rigidity introduced by the supporting spring on an experimental result is avoided; and a designed supporting device can simulate the real flying state of the flying wingto the maximum extent and can reduce experimental errors caused by frictional resistance.

Description

technical field [0001] The invention belongs to the technical field of fluttering wind tunnel test of flying wing body degree of freedom, in particular to a free-flying support device in full-span flying wing body degree of freedom fluttering wind tunnel test. Background technique [0002] The body degree of freedom flutter of a flying wing is a special kind of aeroelastic dynamic instability phenomenon caused by the coupling of the free rigid body pitching mode of the flying wing and the bending mode of the symmetrical wing. In the ground vibration test and wind tunnel test of the flutter model of the flying wing body degree of freedom, most of the research in recent years is mainly based on the half-span model, and the model suspension generally adopts the pitch / heave elastic support design with a balance weight method, this support method can realize the decoupling of the pitch / heave suspension support stiffness, but it cannot be directly used for the suspension of the fu...

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Problems solved by technology

However, after the active control system is adopted, it may cause aeroservoelasticity problems, which will affect the test results of the flutter characteristics of t

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