Wind tunnel test device for vertical and torsion coupled large-amplitude free vibration of bridge

A wind tunnel test and large-amplitude technology, applied in aerodynamic tests, measuring devices, machine/structural component testing, etc., can solve problems such as errors, achieve easy installation, avoid geometric nonlinearity and stiffness nonlinearity, The effect of easy adjustment

Active Publication Date: 2018-08-24
DALIAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, for large-amplitude torsional vibrations, such as when the old Tacoma bridge was destroyed by wind, the torsional amplitude reached an astonishing 35°, which cannot be simulated by traditional free vertical and torsional coupled free vibration test devices.
Even if the torsional amplitude is only 10°, the result is completely wrong

Method used

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  • Wind tunnel test device for vertical and torsion coupled large-amplitude free vibration of bridge

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Embodiment Construction

[0014] The specific implementation manner of the present invention will be described in detail below in combination with the technical scheme and accompanying drawings.

[0015] Such as figure 1 As shown, a bridge vertical and torsional coupled large-amplitude free vibration wind tunnel test device includes a rigid test model 1, a rigid round rod 2, a rigid circular sprocket 3, a chain 4, a linear tension spring 5, a bearing 6, The slider 7 and the guide rail 8; the two ends of the rigid test model 1 are consolidated with the rigid round rod 2, and the rigid round rod 2 passes through the center of the sprocket 3 vertically and is fixed to it, and it is ensured that the torsion center line of the rigid test model 1 is in line with the rigid round rod 2 axis and the center line of sprocket 3 are collinear; chain 4 meshes with the outer contour of sprocket 3, and the two ends of chain 4 are respectively connected with the lower end of linear tension spring 5 to ensure that the r...

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Abstract

The invention provides a wind tunnel test device for vertical and torsion coupled large-amplitude free vibration of a bridge, and belongs to the technical field of bridge wind tunnel test devices. Thewind tunnel test device comprises a rigid test model, a rigid circular rod, a rigid circular sprocket wheel, a chain, linear stretching springs, a bearing, a slide block and a guide rail. The devicecan realizes vertical and torsion large-amplitude coupling free vibration that cannot be realized by a traditional free vibration tester, the vertical springs deform telescopically but not incline tothe lateral side, and the problem that the springs incline obviously and the linear torsion rigidity cannot be insured in the traditional free vibration tester is solved; the wind tunnel test device is simple, convenient to install and easy to adjust an initial attack angle, friction damping is very low in the sprocket wheel and chain drive process, a very low but stable mechanical damping ratio can be ensured in the large-amplitude vibration process, and stable and accurate pneumatic response caused by wind can be further ensured.

Description

technical field [0001] The invention relates to a free vibration wind tunnel test device that can realize large amplitude of bridge rigidity model and can guarantee linear vertical stiffness and linear torsional stiffness. The system composed of the round rod and the circular rigid sprocket, the high-strength chain connecting the spring and the sprocket, the bearing set on the rigid round rod, the slider fixed on the bearing, and the vertical guide rail, integrates the vertical and The torsionally coupled large-amplitude free vibration is transformed into the vertical free expansion and contraction of the linear spring, and the linear vertical translation and linear rotational stiffness of the system are realized by using the linear tensile stiffness of the spring and the circular (constant arm length) rigid sprocket. The model is laterally constrained by the vertical rails, and no lateral displacement occurs. Since the mass and mass moment of inertia of the system remain unc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/02G01M9/08
CPCG01M9/02G01M9/08
Inventor 许福友杨晶曾冬雷
Owner DALIAN UNIV OF TECH
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