Bridge rigid segment model vibration measurement device for simulating oblique wind test condition in wind tunnel

Abstract

A bridge rigid segment model vibration measurement device for simulating inclined wind test conditions in a wind tunnel adopts an upper spring suspension system and a lower spring suspension system, and the positions of spring suspension points need to be adjusted along with wind deflection angles; upper and lower spring lifting points are fixed on a wind tunnel top plate and a wind tunnel bottomplate by strong suckers. And the spring is connected with the model through a light high-strength string. Under the condition that the normal incoming flow direction is kept in the wind tunnel, different wind deflection angles are achieved by adjusting the included angle between the longitudinal axis of the bridge model and the wind direction, and the two end faces are parallel to the wind direction and the wind tunnel side wall when the model is static. The device has the advantages that the windage yaw angle adjustment is simpler, more convenient and easier; no special bracket needs to be manufactured; no damage is caused to the wind tunnel; transverse lazy arms at the end parts of the model and connecting devices between the lazy arms and the model are canceled, so that the influence ofthe lazy arms on the aerodynamic load of the model is eliminated, and the model manufacturing difficulty is reduced; the suspension position of the model can be randomly selected as required withoutbeing limited at the end part, so that the rigidity requirement and the design difficulty of the model are reduced; and the device is lower in overall manufacturing cost and more practical.

Description

technical field [0001] The invention relates to a bridge rigid section model vibration measuring device for simulating oblique wind test conditions in a wind tunnel. The vibration measurement system composed of rigid segmental model, light and high-strength string, linear tension spring and strong suction cup can easily adjust the attitude of the model relative to the wind direction to meet Experimental conditions of different wind angles. Compared with the traditional oblique wind internal support bridge vibration test device, the advantages of this device include: easier adjustment of wind angle; no special vibration measurement support; no damage to the wind tunnel; no end transverse boom and connection The device not only eliminates aerodynamic interference, but also makes the model simpler; the suspension position of the model does not have to be limited to the end, and there can be partly symmetrical cantilevers at both ends, which reduces the span and lowers the rigidi...

AI Technical Summary

Problems solved by technology

The problems include: the adjustment of the windage angle is time-consuming and laborious, and it is generally difficult to achieve continuous adjustment; the bracket placed in the wind tunnel will interfere with the flow field; the local structure of the spring lifting point is usually welded or bolted, which will inevitably cause some damage to the wind tunnel; The local structure of the boom connecting the model and the spring is complex, and will affect the aerodynamic shape of the model, resulting in experimental errors

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