A highly efficient beam-in-beam large sliding contact method for flexible multibody dynamics

Yang, Cheng; Du, Jiuyu; Cheng, Zhiguang; Wu, Yi; Li, Chaowei

doi:10.1007/s00466-021-01984-9

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…In the field of offshore engineering, some scholars have begun to incorporate factors such as drill string rotation and collisions in the hydrodynamic response of the riser [22][23][24]. MAJOR et al [25] discovered that drill string rotation decreases the natural frequency and increases the vibration amplitude of the free vibration response of the drilling riser.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear coupled motions of a pipe-in-pipe system experiencing vortex-induced vibrations

Hou,

Long,

Meng

et al. 2024

Nonlinear Dyn

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This paper delves into the dynamics of the pipe-in-pipe system, crucial in offshore oil and gas exploration, featuring an inner drill string nestled within an outer riser. A reduced-order model with five degrees of freedom is proposed to capture the coupled dynamics of this system. Here, the inner drill string is depicted as a torsional-lateral coupled rotor constrained by the outer riser. In contrast, the outer riser is modeled as a suspended stator subjected to vortex-induced excitations and contact forces. The model incorporates nonlinearities, including dry frictions, collisions, loss of contact, and nonlinear damping through the van der Pol wake oscillator. This comprehensive model allows an indepth exploration of the dynamics of the coupled pipein-pipe system. Parametric analysis is conducted based on the non-dimensional numerical model, revealing a novel and stable whirling phenomenon termed "follower whirling" at low rotary speeds of the drill string. During this stable follower whirling, the riser's vortex-induced vibration traces an "8"-shaped trajectory, while the

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