Influence of vibration amplitude on motion-induced aerodynamic force of a streamline box girder

Xiong Long; Wang Qi; Liao Haili; Li Mingshui

doi:10.11729/syltlx20160204

Volume 31 Issue 3

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Article Navigation > Journal of Experiments in Fluid Mechanics > 2017 > 31(3): 32-37

Xiong Long, Wang Qi, Liao Haili, et al. Influence of vibration amplitude on motion-induced aerodynamic force of a streamline box girder[J]. Journal of Experiments in Fluid Mechanics, 2017, 31(3): 32-37. doi: 10.11729/syltlx20160204

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Influence of vibration amplitude on motion-induced aerodynamic force of a streamline box girder

doi: 10.11729/syltlx20160204

Xiong Long^{1, 2
,},
Wang Qi^{1, 2
,
,},
Liao Haili^{1, 2},
Li Mingshui^{1, 2}

1.
Research Centre for Wind Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
Key Laboratory for Wind Engineering of Sichuan Province, Chengdu 610031, China

Received Date: 2016-12-21
Rev Recd Date: 2017-02-22
Publish Date: 2017-06-25

Abstract

Abstract

The influence of the vibration amplitude on the motion-induced aerodynamic force of the streamline box girder has been studied. Based on a 1:70 rigid sectional model and electronic pressure scanner valves, the aerodynamic force of the model has been obtained by wind tunnel tests. The range of the torsional amplitude is from 2° to 16°, the range of the vertical amplitude is from 5mm to 23mm, and the angles of attack are 0° and ±5°. At 0° angle of attack, when the torsional amplitude is less than 8° and the vertical reduced amplitude is less than 0.46, the proportions of the linear motion-induced aerodynamic force remain stable and are more than 95%. When the amplitude of the torsional vibration is greater than 8° and the angle of attack is +5°, the linear harmonic components decrease and the high-order harmonic ones increase with the increase of the amplitude. The change of flutter derivatives shows that the torsional amplitude affects A₂^*, A₃^* and H₂^* dramatically, which implies the nonlinear change of the aerodynamic force. However, the vertical amplitude only affects H₄^*, which is not the control parameter of flutter analysis, and has no influence on the other flutter derivatives. The brief conclusion is that although the force-amplitude behavior of a streamline box girder is nonlinear, there is no obvious high-order component in the motion-induced aerodynamic force under a certain amplitude, especially under 8° torsional amplitude.
- forced vibration,
- streamline box girder,
- motion-induced aerodynamic force,
- nonlinearity,
- flutter derivatives

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References(16)

References

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