西南石油大学学报(自然科学版)

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An Analysis of the Wet Modal Vibration of Marine Riser

Jiang Feng*, Zheng Yunhu, Liang Rui, Du Chaofei   

  1. School of Petrochemical Technology,Lanzhou University of Science and Technology,Lanzhou,Gansu 730050,China
  • Online:2015-10-01 Published:2015-10-01

Abstract:

To solve the problems of the wet modal vibration of marine riser,we studied the natural frequency of the riser and the
corresponding vibration modes. Using Acoustic Extension module of ANSYS Workbench,we analyzed the wet modal vibration
of the marine riser,described the wet modal modeling methods and techniques,and obtained 12 natural frequencies and modes.
By comparing with the 12 dry modal analysis,we found the differences between the two,which indicates that the wet modal
analysis is irreplaceable in doing underwater research in structural vibration. By calculating the vibration characteristics of the
optimized structure,we demonstrated the feasibility of optimization. Modal analysis provides a certain basis for the study of
the vibration characteristics and the optimizing of structure,and a certain reference for preventing structure resonance.

Key words: vibration fatigue, wet modal, virtual mass, FSI, Acoustic-Body

CLC Number: