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A bridge vertical and torsional coupled large-amplitude free vibration wind tunnel test device

A wind tunnel test and large amplitude technology, applied in aerodynamic tests, measuring devices, testing of machine/structural components, etc., can solve problems such as errors, achieve low cost, low price, avoid geometric nonlinearity and rigidity Effects on Linear Problems

Active Publication Date: 2019-06-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the study of large-amplitude torsional vibration, 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 amplitude reaches 10°, the result may already be completely wrong

Method used

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  • A bridge vertical and torsional coupled large-amplitude free vibration wind tunnel test device
  • A bridge vertical and torsional coupled large-amplitude free vibration wind tunnel test device

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Embodiment Construction

[0015] The specific implementation manner of the present invention will be described in detail below in combination with the technical scheme and accompanying drawings.

[0016] Such as figure 1 As shown, a bridge vertical and torsional coupling large-amplitude free vibration wind tunnel test device includes a rigid test model 1, a light rigid rod 2, a light rigid circular hub 3, a first string 4, and a linear tension spring 5 and the second string 6; the two ends of the rigid test model 1 are consolidated with a rigid rod 2, and the rigid rod 2 passes through the center of the hub 3 vertically and is fixed thereto, and ensures that the torsion centerline of the rigid test model 1 is aligned with the axis of the rigid rod 2 and the hub 3 The center lines are collinear; the first string 4 is wound in the groove of the hub 3 to form a movable pulley, one end of the first string 4 is fixed to the bottom of the hub 3, and the other end is connected to the lower end of the spring 5...

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Abstract

The invention provides a bridge vertical direction and torsion coupling large amplitude free vibration wind tunnel test device and belongs to the technical field of bridge wind tunnel test devices. The device includes a rigid test model, a lightweight rigid rod, a lightweight rigid round hub, a first string, linear tension springs and a second string. According to the device, the free vertical direction and torsion large amplitude coupling free vibration of a bridge model can be achieved, a vertical spring only has telescopic deformation without lateral tilting, and a problem that a spring isobviously tilted and the linear torsional rigidity cannot be guaranteed in a conventional free vibration test device does not exist. The device is simple and is easy to install, an initial angle of attack is easy to adjust, and due to the rolling friction between the strings and the hub, the mechanical damping ratio is very low.

Description

technical field [0001] The invention relates to a free vibration wind tunnel test device that can realize a large amplitude of bridge rigidity model and can guarantee linear vertical stiffness and linear torsional stiffness, and specifically relates to the method of fixing the model at both ends by erecting linear tension springs The system consisting of a light and rigid circular hub and a high-strength string connecting the spring and the hub converts the large-amplitude vertical and torsional coupling free vibration of the bridge model into the vertical free expansion and contraction of the linear spring, and utilizes the linear tensile stiffness and The circular rigid hub achieves linear vertical translation and linear rotational stiffness of the system. Since the mass and mass moment of inertia of the system remain constant during the entire large-scale coupling vibration process, the frequency of vertical translation and rotation around the center of the hub remains cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 许福友
Owner DALIAN UNIV OF TECH
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