Vertical-torsion coupled large-amplitude free vibration wind tunnel experiment system

Abstract

The invention relates to a vertical-torsion coupled large-amplitude free vibration wind tunnel experiment system. The system comprises two symmetrically-installed supporting frames, the tops of the supporting frames are provided with at least two upper spring fixing arms, and the upper spring fixing arms are connected to the upper ends of upper springs; lower spring fixing arms are arranged at thebottoms of the supporting frames; the lower spring fixing arms are connected to the lower ends of lower springs; the lower ends of the two upper springs are connected through a rigid suspension arm;a bearing seat is mounted on the rigid suspension arm; two ends of a rigid test model are respectively fixedly connected to one end of a rigid shaft; the other end of the rigid shaft is fixedly arranged in the bearing seat; a hub is fixedly connected to the rigid shaft, a torsion center line of the rigid test model is collinear with the axis of the rigid shaft and the center line of the hub, the periphery of the hub is sleeved with and fixedly connected to the middle of a first flexible connecting piece, and two ends of the first flexible connecting piece extend downwards and are connected tothe upper ends of the lower springs respectively. The system is independently provided with a torsional rigidity system, so that the flexibility of the test device is improved.

Description

technical field [0001] The invention relates to a bridge structure model test device, in particular to a wind tunnel test system for vertical torsion coupled large amplitude free vibration. Background technique [0002] The vertical and torsional two-degree-of-freedom coupled free vibration method is a main method for bridge wind tunnel test vibration (eddy vibration, buffeting, galloping, flutter), and is also an important wind tunnel test for bridge flutter derivative identification. method. [0003] The traditional vertical and torsional two-degree-of-freedom coupling free vibration test device is realized by hanging on the main beam segment by vertical springs, and the device is simple and easy to implement. When the amplitude of the coupled free vibration of the vertical and torsional two degrees of freedom is small, the lateral inclination of the vertical extension spring is small. Therefore, the vertical extension spring that provides both vertical and torsional stif...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a bridge wind tunnel test device that is not suitable for vertical torsional two-degree-of-freedom coupled large-amplitude free vibration and the need to improve the two-dimensional flow around the rigid model and reduce test errors. The vertical torsion coupled large amplitude free vibration wind tunnel experimental system can freely adjust the two parameters of spring stiffness and moment arm to flexibly configure the torsional stiffness

Images