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- Title
A wake-oscillator model for predicting VIV of 4-to-1 rectangular section cylinder.
- Authors
Hui, Yi; Tang, Yuanyan; Yang, Qingshan; Chen, Bo
- Abstract
Vortex-induced vibration (VIV) is a typical of large amplitude vibration for slender structure. Predicting the amplitude and wind speed range for VIV is vital and challenging in the wind-resistance design. The 4:1 rectangular cross-section cylinder is one of the representative structure for fundamental wind-induced vibration analysis. In this study, a novel wake-oscillator model tailored for predicting VIV in a 4:1 rectangular cylinder is proposed. Besides structural responses, this model can also conceptually reproduce the shedding behaviors of the vortices around the cylinder. For this purpose, two oscillators are employed and attached to the structure in the model. Oscillator 1, mounted on the rear face, simulates the swaying motion of the wake vortex. Oscillator 2, attached to the windward face, represents the variations in the main vortices generated from the leading edges. Governing functions of the two oscillators are derived according to the zero circulation assumption of the target region. The parameters are determined with accordance to both the rigid and aero-elastic model tests. The model's validity is examined through the comparison of the predicted response amplitudes with experimental data. Results demonstrate that the model can effectively predict the cylinder's responses across various Scruton numbers, using a single set of model parameters. This model is further applied to investigate the underlying mechanics of VIV excitation, focusing on the provided wind load and vibrating frequencies of Oscillators 1 and 2. These analyses helps to understand the structural VIV phenomenon.
- Subjects
WIND speed; VORTEX motion; WIND pressure; SOIL mechanics; FORECASTING; VORTEX shedding; NONLINEAR oscillators
- Publication
Nonlinear Dynamics, 2024, Vol 112, Issue 11, p8985
- ISSN
0924-090X
- Publication type
Article
- DOI
10.1007/s11071-024-09516-9