A wind tunnel experimental device for three-degree-of-freedom coupling vibration under high wind attack angle

Abstract

The invention discloses a wind tunnel experimental device for three-degree-of-freedom coupling vibration under a strong wind attack angle, which includes a horizontal plate spring, a vertical plate spring, a bearing, a rigid boom, a linear tension spring, a rotary hinge, a vertical support rod, Wind tunnel α rotating mechanism, connecting rod, rigid test model and its connecting parts. It can solve the problem of "distortion" of the vibration form of the traditional spring suspension vibration system under high wind attack angle, and can also avoid the strong structural nonlinear problem caused by the vertical / lateral tension spring inclination of the traditional suspension system during the large-amplitude torsional vibration process . Realized the structural decoupling of the three-degree-of-freedom support system, which can still ensure good linear stiffness and stable vibration frequency in the process of large-amplitude vibration, and uses leaf spring support to avoid the spring caused by the gravity of the model at a large angle of attack Inclined to meet the requirements of vibration testing under high wind angle of attack, making it possible to test the three-degree-of-freedom vibration of blunt body flexible components under high wind angle of attack.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests of civil structures, and relates to a wind tunnel test device, in particular to a wind tunnel test device for three-degree-of-freedom coupling vibration under a strong wind attack angle. Background technique [0002] The segmental model free vibration wind tunnel experiment is the main method to measure the wind-induced vibration response (flutter, vortex vibration, galloping, buffeting) of civil structures, and it is also an important experimental method to identify the aerodynamic parameters of various blunt body sections. A large number of vertically arranged flexible components (hangers, bridge towers, etc.) in civil engineering structures, as well as horizontal flexible components in mountainous and canyon areas, need to test the wind-induced vibration characteristics under high wind attack angles. The traditional segmental model three-degree-of-freedom coupled vibration wind tunnel...

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Problems solved by technology

[0003] (1) When the model vibrates laterally, it will cause lateral vibration at the tension end of the vertical spring, the vertical spring will tilt, and both the lateral stiffness and vertical stiffness will change, so the linear stiffness cannot be guaranteed;

[0004] (2) When the model vibrates vertically, it will cause vertical vibration at the tension end of the lateral spring, and the lateral spring will tilt, which cannot guarantee the linear stiffness;

[0006] (4) When the static wind displacement of the model in the vertical, lateral and torsional directions occurs, the spring will also be tilted;

[0007] (5) When the wind attack angle increases, if the model is only rotated and the vertical and lateral spring directions remain unchanged, the model will vibrate along the wind axis instead of the actual body axis, resulting in the problem of "distortion" of the vibration form

If the elastic support system is rotated with the model, the elastic support system will sag due to the gravity of the model, which will also cause the spring to tilt significantly, and the linear stiffness cannot be guaranteed

[0008] The applicant found that the root of the above-mentioned problems in the traditional three-degree-of-freedom coupling vibration device is the coupling effect of the vertical-lateral-torsional stiffness system. The larger the wind attack angle and the larger the amplitude, the more serious the spring tilt will be. Unacceptable errors in experimental test results

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