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Large amplitude free vertical and torsional coupling vibration wind tunnel test device

A technology of coupling vibration and wind tunnel test, applied in vibration test, aerodynamic test, measurement device, etc., to achieve good results

Active Publication Date: 2017-11-14
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the study of large-amplitude free 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 vibration test devices.

Method used

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  • Large amplitude free vertical and torsional coupling vibration wind tunnel test device

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Embodiment Construction

[0010] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0011] Such as figure 1 As shown, the large-scale free bending-torsion coupling vibration device is composed of a model 1, a screw rod 2, a nut 3, a beam 4, a tooth block 5, a tooth plate 6, a slider 7, a spring 8 and a guide rail 9. The model 1, the screw 2, and the beam 4 (the beam 4 is consolidated with the tooth block 5) are consolidated with the nut 3 to form a whole, and the concentricity is ensured. During the large-amplitude free vertical and torsional coupling vibration of the tooth block 5 with the model 1, it drives the tooth plate 6 to move vertically, and the slider 7 consolidated with the tooth plate 6 also moves vertically on the guide rail 9 , the linear stiffness spring on the slider produces vertical telescopic deformation without tilting, and the vertical stiffness of the spring provides the tors...

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Abstract

The invention provides a large amplitude free vertical and torsional coupling vibration wind tunnel test device, which belongs to the technical field of free vertical bending and torsional coupling vibration wind tunnel test devices. Gear blocks are fixed on both ends of a crossbeam. Screws, the crossbeam and the gear blocks are fixed on both ends of a model and carry out vertical bending and torsional coupling vibration with the model to drive the meshed toothed plate and a slider fixing the toothed plate to translate up and down reciprocally along a guide rail fixed on the ground. A vertical spring connected with the slider provides torsional and vertical rigidity for a model suspension system. The spring is simply vertically linearly deformable without lateral tilting, which ensures the vertical linear torsion and vertical bending rigidity of the model. Lateral freedom is effectively constrained. The device can realize sharp free vertical bending and torsional coupling vibration of the model. The spring is simply vertically telescopically deformable without lateral tilting. The problem that a spring in a traditional free vibration test device obviously tilts and cannot ensure the linear torsional rigidity is solved. Lateral vibration of the model is constrained.

Description

technical field [0001] The invention belongs to a free vertical and torsional coupled vibration wind tunnel test device that can realize large amplitude and ensure linear torsional and vertical bending stiffness, and specifically relates to the transmission of the tooth blocks and tooth plates that mesh with each other, and the model's The large-amplitude free vertical and torsional coupled vibrations are transformed into the free expansion and translation of the vertical linear spring, and the linear torsional and vertical bending stiffness of the model are realized by using the linear tensile stiffness of the spring. Background technique [0002] The free vertical and torsional coupling vibration method is a main method for measuring vibration in bridge wind tunnel tests, and is also an important method for identifying flutter derivatives in wind tunnel tests. It is not necessary to ensure that the stiffness and frequency of each vibration mode are the same during the proc...

Claims

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Application Information

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IPC IPC(8): G01M9/02G01M7/02
CPCG01M7/00G01M9/02G01M5/0008G01M5/0066G01M9/062G01M7/06G01M9/04
Inventor 许福友曾冬雷杨晶
Owner DALIAN UNIV OF TECH
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