Flow-Induced Vibration Response of a Flat Plate in a Confined Rectangular Channel

doi:10.16183/j.cnki.jsjtu.2024.106

Abstract

Abstract:

Experiments on flow induced vibration of a rectangular flat plate with two ends fixed in a confined channel are conducted, and vibration response characteristics of the plate are obtained. The results show that the main physical mechanisms of vibration are turbulent-induced vibration and vortex-induced vibration. The turbulence excites the response of the first natural frequency of plate and is amplified with the increasing flow velocity. The frequency of vortex-induced vibration shows a linear increase with the flow velocity, and the Strouhal number Sr=0.24 within the test range. The ‘lock-in’ phenomenon and resonance occur when the vortex shedding frequency approaches the natural frequency, and non-linear frequency-doubling response appears. The first natural frequency of the flat plate shows no obvious trend with changes in flow velocity. In addition, the wet modal analysis based on acoustic-solid coupling method were conducted and the predicted results show a good agreement with the experimental values.

Key words: rectangular flat plat, flow-induced vibration, wet modal, acoustic-solid coupling

CLC Number:

O353.4

WU Yikai, ZHU Yechen, GONG Shengjie. Flow-Induced Vibration Response of a Flat Plate in a Confined Rectangular Channel[J]. Journal of Shanghai Jiao Tong University, 2026, 60(2): 331-337.

Figures/Tables 11

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编号	节点数	湿模态一阶频率/Hz	偏差/%	湿模态二阶频率/Hz	偏差/%
1	23 887	947.1	0.92	3 266.0	0.52
2	44 945	943.1	0.49	3 258.2	0.28
3	80 515	938.5	—	3 249.2	—

方法	频率/Hz	与实验值偏差/%
实验	961.0	—
ANSYS声固耦合	938.5	2.3
Haddara等^[4]	909.6	5.4