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A Flutter Wind Tunnel Test Device with Bending-torsional Stiffness Decoupling

A technology of wind tunnel test and torsional stiffness, which is applied in the direction of measuring device, aerodynamic test, machine/structural component test, etc. It can solve problems such as deviation, and achieve high efficiency, easy installation and use, and high practical value Effect

Active Publication Date: 2021-05-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The flutter wind tunnel test of this type of structure is difficult to carry out experimental research on the independent changes of the two design parameters of bending stiffness or torsional stiffness
In this case, people can only use theoretical analysis or numerical simulation to study the influence of independent changes in bending or torsional stiffness on the flutter characteristics, and there is a large deviation between theory or simulation and the actual structure

Method used

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  • A Flutter Wind Tunnel Test Device with Bending-torsional Stiffness Decoupling

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as figure 1 As shown, the present invention is a flutter wind tunnel test device with bending and torsional stiffness decoupling, comprising an aerodynamic lift surface 1, an acceleration sensor 2, a rotating shaft 3, a bearing 4, a flange 5, an anti-fall pin 6, and a torsion bearing 7. Torsion spring 8, cantilever steel beam 9, bending support 10 and aluminum handle 11. The acceleration sensor 2 is placed inside the aerodynamic lifting surface 1, the aerodynamic lifting surface 1 is fixedly connected to the rotating shaft 3, the rotating shaft 3 is fixed on the torsion bearing 7 through the bearing 4 and the flange 5, and the rotating shaft 3 and the torsion bearing 7 are connected by a torsion spring 8 connection, the torsion support 7 is fixed at the ends of two cantilever steel beams 9, and the two cantilever steel be...

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Abstract

A flutter wind tunnel test device with bending and torsional stiffness decoupling, including a cantilever steel beam that independently provides bending stiffness and a torsion spring that independently provides torsional stiffness. The support is installed at the end of the cantilever steel beam, and the root of the cantilever steel beam is fixed in the low-speed wind tunnel; the invention can realize the decoupling of the bending and torsional stiffness of the flutter wind tunnel test device, and has an adjustable stiffness mechanism to ensure the bending and torsion of the model. The stiffness is adjustable within a certain parameter range, which can realize the flutter wind tunnel test measurement of a single stiffness parameter change.

Description

technical field [0001] The invention belongs to the technical field of aeroelasticity wind tunnel test in the subject of aviation science and technology, and in particular relates to an experimental device for eliminating the coupling of bending and torsional stiffness in flutter wind tunnel tests. Background technique [0002] Flutter is the self-excited vibration behavior of the structure in the air flow caused by the instability of the system due to aeroelastic coupling. Undamped flutter of aircraft components of considerable amplitude is dangerous, and ground testing is required to find ways to avoid flutter. The flutter wind tunnel test is a test technique to carry out ground tests in a wind tunnel to determine the aerodynamic / structural conditions for flutter and to measure the amplitude and frequency of the flutter response of the structure. In the flutter wind tunnel test, the vibration caused by the aeroelastic coupling effect of the structure in the wind tunnel ai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/08G01M9/04
CPCG01M9/04G01M9/08
Inventor 夏巍刘方园周律王琨李嵩申胜平
Owner XI AN JIAOTONG UNIV
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