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Stability analysis of deepwater compliant vertical access riser about parametric excitation

  • Lou, Min (College of Petroleum Engineering, China University of Petroleum (East China)) ;
  • Hu, Ping (College of Petroleum Engineering, China University of Petroleum (East China)) ;
  • Qi, Xiaoliang (College of Engineering, Ocean University of China) ;
  • Li, Hongwei (College of Petroleum Engineering, China University of Petroleum (East China))
  • Received : 2018.08.18
  • Accepted : 2019.02.19
  • Published : 2019.02.18

Abstract

If heave motion in the platform causes horizontal parametric vibration of a Compliant Vertical Access Riser (CVAR), the riser may become unstable. A combination of riser parameters lies in the unstable region aggravates vibrational damage to the riser. Change of axial tensile stress in the riser combined with its natural frequency and mode shape change results in mode coupling. In accordance with the state transition matrices of the riser in the coupled and uncoupled states, the stable and unstable regions were obtained by Floquet theory, and the vibration response under different conditions was obtained. The parametric excitation of the CVAR is shown to occur mainly in first-order unstable regions. Mode coupling may cause parametric excitation in the least stable regions. Damping reduces the extent of unstable regions to a certain extent.

Acknowledgement

Supported by : National Natural Science Foundation of China

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