Large-amplitude free vibration wind tunnel test device with three degrees of freedom

Abstract

The invention provides a large-amplitude free vibration wind tunnel test device with three degrees of freedom, and belongs to the technical field of wind tunnel test devices for bridges. The large-amplitude free vibration wind tunnel test device which is a large-amplitude free vibration wind tunnel test device with three degrees of freedom coupling for bridges comprises a rigid test model, a rigidround bar, a rigid suspension arm, arc blocks with grooves, light high-strength strings, linear extension springs, fixed pulleys and a bearing. The large-amplitude free vibration wind tunnel test device has the advantages that the problem of incapability of guaranteeing the linear vertical rigidity, the linear torsional rigidity and the linear lateral rigidity due to down warping of lateral springs horizontally arranged in the traditional vibration test device with three degrees of freedom and lateral tilting of vertical springs under large-amplitude conditions can be effectively solved by the aid of the large-amplitude free vibration wind tunnel test device; the large-amplitude free vibration wind tunnel test device is simple and is convenient to mount, initial attack angles are easy toadjust, down warping and tilting of the springs are prevented in vibration procedures, accordingly, the linear rigidity and stable vibration frequencies of systems still can be guaranteed even in large-amplitude vibration procedures, and research on the three-dimensional nonlinear pneumatic characteristics of the bridges becomes possible under large-amplitude conditions.

Description

technical field

[0001] The invention relates to a three-degree-of-freedom free vibration wind tunnel test device that can realize a large amplitude of bridge rigidity model and can guarantee linear vertical stiffness, linear torsional stiffness and linear lateral stiffness. The vertical and torsional coupled large-amplitude free vibration system composed of light and high-strength string, vertical linear tension spring and fixed pulley, and the lateral vibration system composed of light and high-strength string, bearing, vertical linear tension spring and fixed pulley The free vibration system converts the three-degree-of-freedom coupled large-amplitude free vibration of the bridge rigid model into the vertical free expansion and contraction of the linear spring, and uses the linear tensile stiffness of the spring, rigid arc boom and fixed pulley to realize the vertical and lateral Linear translational stiffness and linear torsional stiffness. Since the system mass and mass m...

Examples

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 three-degree-of-freedom coupled large-amplitude free vibration wind tunnel test device includes a rigid test model 1, a rigid round rod 2, a rigid boom 3, an arc block with grooves 4, the first lightweight high-strength thin Rope 5, first linear tension spring 6, first fixed pulley 7, second light and high-strength string 8, second linear tension spring 9, second fixed pulley 10, and bearing 11. 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 rigid boom 3 vertically and is fixed to it, and it is ensured that the torsion centerline of the rigid test model 1 is aligned with the axis of the rigid round rod 2 and the rigid boom 3 The center lines are collinear; two arc blocks 4 with ...

technical field

[0001] The invention relates to a three-degree-of-freedom free vibration wind tunnel test device that can realize a large amplitude of bridge rigidity model and can guarantee linear vertical stiffness, linear torsional stiffness and linear lateral stiffness. The vertical and torsional coupled large-amplitude free vibration system composed of light and high-strength string, vertical linear tension spring and fixed pulley, and the lateral vibration system composed of light and high-strength string, bearing, vertical linear tension spring and fixed pulley The free vibration system converts the three-degree-of-freedom coupled large-amplitude free vibration of the bridge rigid model into the vertical free expansion and contraction of the linear spring, and uses the linear tensile stiffness of the spring, rigid arc boom and fixed pulley to realize the vertical and lateral Linear translational stiffness and linear torsional stiffness. Since the system mass and mass m...

Examples

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 three-degree-of-freedom coupled large-amplitude free vibration wind tunnel test device includes a rigid test model 1, a rigid round rod 2, a rigid boom 3, an arc block with grooves 4, the first lightweight high-strength thin Rope 5, first linear tension spring 6, first fixed pulley 7, second light and high-strength string 8, second linear tension spring 9, second fixed pulley 10, and bearing 11. 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 rigid boom 3 vertically and is fixed to it, and it is ensured that the torsion centerline of the rigid test model 1 is aligned with the axis of the rigid round rod 2 and the rigid boom 3 The center lines are collinear; two arc blocks 4 with ...

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