A Suspension System for Bridge Segmental Model Wind Tunnel Test Based on the Principle of Magnetic Levitation

Abstract

The invention relates to a segmental model suspension system based on the principle of magnetic levitation, which includes two sets of suspension support devices with the same structure. The device respectively includes a wind attack angle adjustment plate, a support frame, a vertical flutter measurement assembly and a torsional flutter measurement assembly. The wind attack angle adjustment plate is fixed outside the side wall of the wind tunnel, and the support frame passes through the vertical flutter measurement assembly. Installed on the wind attack angle adjustment plate, it can move in the vertical direction. The torsional flutter measurement component is installed on the support frame and connected with the segmental test model, which can drive the segmental test model to do torsional movement. Vertical flutter measurement The component provides the stiffness of the segmental test model in the vertical direction through the spring, and the torsional flutter measurement component provides the stiffness of the segmental test model in the torsional direction through magnetic suspension. Compared with the prior art, the present invention is stable and reliable, and can realize undamped vibration, etc. advantage.

Description

technical field [0001] The invention relates to a bridge segment model wind tunnel test suspension system, in particular to a segment model suspension system based on the principle of magnetic suspension. Background technique [0002] With the development of modern bridges in the direction of large spans, the problem of bridge flutter under wind load has gradually become prominent. Therefore, the wind-induced vibration test of the segmental model is an important basis in the bridge design process. The suspension support device of the segmental model needs to meet the requirements of good stiffness and damping linearity, small airflow interference, and strong linear deformation ability. [0003] At present, the commonly used suspension support device adopts a total of eight vertical springs up and down to suspend and support the bridge segment model. The device is simple and easy to use. When the amplitude of free vibration of the segment model is small, the vertical spring c...

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Problems solved by technology

However, when the torsion amplitude is large, it is easy to cause the lateral inclination of the vertical spring, which will cause a nonlinear change in the torsional stiffness provided by the spring suspension system, so that it is actually impossible to simulate the wind tunnel test phenomenon of large angle of attack and large amplitude, and it is impossible to provide bridge The design provides reliable test data

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