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A Wiener-Laguerre Model of VIV Forces Given Recent Cylinder Velocities

机译:考虑最近圆柱速度的VIV力的Wiener-Laguerre模型

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摘要

Slender structures immersed in a cross flow can experience vibrations induced by vortex shedding (VIV), which cause fatigue damage and other problems. VIV models that are used in structural design today tend to assume harmonic oscillations in some way or other. A time domain model would allow to capture the chaotic nature of VIV and to model interactions with other loads and nonlinearities. Such a model was developed in the present work: for each cross section, recent velocity history is compressed using Laguerre polynomials. The compressed information is used to enter an interpolation function to predict the instantaneous force, allowing to step the dynamic analysis. An offshore riser was modeled in this way: some analyses provided an unusually fine level of realism, while in other analyses, the riser fell into an unphysical pattern of vibration. It is concluded that the concept is promising, yet that more work is needed to understand orbit stability and related issues, in order to produce an engineering tool.
机译:沉浸在横流中的细长结构可能会遭受涡流脱落(VIV)引起的振动,这会导致疲劳损伤和其他问题。当今在结构设计中使用的VIV模型倾向于以某种方式假定谐波振荡。时域模型将允许捕获VIV的混沌特性,并建模与其他负载和非线性的相互作用。在当前工作中开发了这样的模型:对于每个横截面,使用Laguerre多项式压缩最近的速度历史。压缩的信息用于输入插值函数以预测瞬时力,从而可以进行动态分析。海上立管以这种方式建模:一些分析提供了异常出色的真实感,而在其他分析中,立管陷入了非自然的振动模式。结论是,这一概念是有希望的,但还需要做更多的工作来了解轨道稳定性和相关问题,以便生产出一种工程工具。

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  • 来源
    《Mathematical Problems in Engineering》 |2011年第2期|p.1-43|共43页
  • 作者

    Philippe Maincon;

  • 作者单位

    Centre for Ships and Ocean Structures, Marine Technology Centre, N7491 Trondheim, Norway;

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  • 正文语种 eng
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