Dynamic Responses on the Vortex-Induced Vibration of the Riser Under the Dual Parametric Excitation
摘要
The combined vibrations of a top tensioned riser (TTR) excited by the waves and currents are investigated in this paper. The time-varying tension with two frequency components is considered and the time-varying characteristics of the currents are represented by the van der Pol oscillators. The effects of amplitude ratio of the fluctuating tension, the shedding frequency of the vortices and other parameters on the responses are investigated by the numerical method. The results show that some complicated responses can occur under the combined resonance.