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On fatigue damage of long flexible cylinders due to the higher harmonic force components and chaotic vortex-induced vibrations

机译：由于高次谐波力分量和涡旋激振引起的长柔性气缸的疲劳损伤

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Recent experimental data have revealed that vortex-induced vibrations of long flexible cylinders are characterized by time intervals of chaotic response, followed or preceded by periods of statistically stationary response. A chaotic response is characterized by a broad-band PSD, while the steady response can have large higher harmonic stress components. Regions of chaotic response and the steady regions with large higher harmonic stress components contain distinctly different response features and have significant implications on the fatigue analysis. To quantify the effect of the higher harmonic force components and chaotic oscillations on fatigue damage of long flexible structures, we generate stress time series such that we can include or remove the higher harmonics, and also use either a narrow-band or broad-band PSD. This approach enables us to conduct a systematic study on the influence of each of these phenomena on the resulting fatigue damage. We show a dramatic increase in fatigue damage for signals containing higher harmonics. On the other hand, for chaotic stress signals, the fatigue damage is increased moderately, relative to a stress signal with a narrow-band PSD with the same total power.
机译：最近的实验数据表明，长挠性圆柱体的涡激振动以混沌响应的时间间隔为特征，在统计稳定响应周期之后或之前。混沌响应的特征在于宽带PSD，而稳定响应可能具有较大的高次谐波应力分量。混沌响应区域和具有较大高次谐波应力分量的稳定区域具有明显不同的响应特征，对疲劳分析具有重要意义。为了量化高次谐波分量和混沌振荡对长形挠性结构的疲劳损伤的影响，我们生成了应力时间序列，以便可以包含或移除高次谐波，并且还使用了窄带或宽带PSD 。这种方法使我们能够对每种现象对所造成的疲劳损伤的影响进行系统的研究。对于包含较高谐波的信号，我们显示出疲劳损伤的急剧增加。另一方面，相对于具有相同总功率的窄带PSD的应力信号，对于混沌应力信号，疲劳损伤会适度增加。

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