Nonlinear dynamic response analysis of marine towing cable under combined wave- and vortex-induced excitation

Le résumé fourni par la source

In the practical scenarios, the marine towing cable will be affected by the bi–effects of waves and vortex performing a more complex response compared to that under uniform towing conditions. This paper proposes a numerical model to investigate the combined wave– and vortex–induced vibration characteristics of marine towing cable. The effectiveness of the model is validated by an experiment. The dynamic configuration and tension of marine towing cable with different ship motion amplitude and period are studied. Based on the time–varying tension, the characteristics of vortex–induced vibration are researched using the proposed model. The sub–harmonic frequencies ωCT ± ωT are excited due to the ship motion. Some extreme conditions will cause the towing cable to experience Mathieu instability, and the response displacement is significantly amplified. The mechanism of the combined wave– and vortex–induced vibration is analyzed by theoretical formula.

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