Vortex-induced vibration experiments with a long semi-immersed flexible cylinder under tension modulation: Fourier transform and Hilbert–Huang spectral analyses

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• 作者：Guilherme R. Franzini ; Rodolfo T. Gon?alves…
• 关键词：Vortex ; induced vibrations ; Flexible cylinder ; Stiffness modulation and Hilbert–Huang transform.
• 刊名：Journal of the Brazilian Society of Mechanical Sciences and Engineering
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：37
• 期：2
• 页码：589-599
• 全文大小：1,942 KB
• 参考文献：1. Assi GRS, Meneghini JR, Aranha JAP, Coleto WGP (2005) Design, assembling and verification of a circulating water channel facility for fluid dynamics experiments. In: Proceedings of COBEM05-8th international congress of mechanical engineering
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  4. Chaplin, JR, Bearman, PW, Huera Huarte, FJ, Pattenden, RJ (2005) Laboratory measurements of vortex-induced vibrations of a vertical tension riser in a stepped current. J Fluids Struct 21: pp. 3-24 CrossRef
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  9. Franzini, GR, Gon?alves, RT, Meneghini, JR, Fujarra, ALC (2013) One and two degrees-of-freedom vortex-induced vibration experiments with yawed cylinders. J Fluids Struct 42: pp. 401-420 CrossRef
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• 刊物主题：Mechanical Engineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1806-3691

文摘

An experimental investigation of the vortex-induced vibration phenomenon on a long semi-immersed flexible cylinder in constant current profile were carried out at a recirculating water channel facility. The experiments are part of a comprehensive research project which aims a better understanding of non-linear riser dynamics. Vertical and prescribed monochromatic harmonic motions were imposed to the top with amplitude \(A_t/L\approx 1\,\%\) causing eigenfrequencies modulations. The mass ratio parameter is \(m^*\approx 10\) , and the ratio between the total length \(L\) and the immersed length \(L_\text {im}\) is \(L/L_\text {im}\approx 3.5\) . The Reynolds number \(Re\) range lies within the interval \(10^3 . Three values of motion frequency \(f_t\) were imposed, being them \(f_t:f_{N,1}=\) 1:3, 1:2 and 1:1 where \(f_{N,1}\) is the first eigenfrequency. The application of both the Fourier Transform and the Hilbert–Huang Transform allowed identifying subharmonic components and also frequency modulation aspects in the data.