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parametric stability Analysis of Marine Risers with Multiphase Internal Flows Considering Hydrate Phase Transitions

Journal of Ocean University of China 2021年第1期20卷 23-34页

作者： LIANG Weixing LOU Min College of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China

This study investigates the effects of multiphase internal flows that consider hydrate phase transitions on the parametric stability of marine risers.A numerical model of the multiphase internal flow that considers a hydrate phase transition is *** model first solves the flow parameters and subsequently obtains the natural frequencies of risers with different gas intake *** stability charts of marine risers with different gas intake ratios are plotted by applying Floquet theory,and the effects of the gas intake ratio on the instability and vibration response of the risers are *** natural frequency increases with an increase in the gas intake ratio;thus,instability zones move to higher frequency ranges in the stability *** the increasing gas intake ratio reduces the damping effect of the Coriolis force,the critical amplitude of the heave in the unstable region decreases,especially when hydrodynamic damping is not *** a result,higher-order unstable regions are *** in an unstable region,the vibration response curve of a riser with a high gas intake ratio excited by parametric resonance diverges quickly due to parametric resonance.

关键词： hydrate phase transition marine risers multiphase internal flow parametric stability vibration response

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On parametric Instability Boundaries of Axially Moving Beams with Internal Resonance

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Acta Mechanica Solida Sinica 2018年第4期31卷 470-483页

作者： You-Qi Tang Yuan-Xun Zhang Xiao-Dong Yang School of Mechanical Engineering Shanghai Institute of Technology Shanghai 201418 China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Engineering College of Mechanical Engineering Beijing University of Technology Beijing 100124 China

In this paper, the instability boundaries of an axially moving viscoelastic beam due to parametric resonance are revisited for the internal resonance case. The relation between the time-dependent tension and the time-dependent axial speed is constructed, which provides a new model in the study of axially moving material with pulsation parameters. The instability boundaries caused by the combination of parametric and internal resonances are studied using the method of multiple time scales. Some strange instability boundaries are detected when the internal resonance is considered. The phenomenon of local zigzag boundary contour is explained from the viewpoint of modal interactions.

关键词： parametric stability Axially moving beam Instability boundary Modal interac-tions

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