Dissertation > Excellent graduate degree dissertation topics show

The Study on the Parametric Vibration for Top-Tension Riser in Deep-sea

Author: FengLiMei
Tutor: TangYouGang
School: Tianjin University
Course: Design and manufacture of ships and marine structures
Keywords: Deep-sea riser Parametrically excited vibration Mathieu unstable region The flow of vibration Vortex-induced vibration
CLC: P756.2
Type: Master's thesis
Year: 2010
Downloads: 83
Quote: 1
Read: Download Dissertation

Abstract


Riser conduit connected to the water floating device and subsea wellhead equipment , the structure is an important part of the marine engineering , is also one of the weak and vulnerable components . Riser suffered quite complex environmental load , its vibration response has been a hot research field of marine petroleum engineering . Water depth of 1,500 meters above sea platform risers which the environmental load situation is more complex . At present, the domestic shallow water riser theoretical studies have been relatively mature , but deep-sea the riser research work is still in its infancy . This paper summarizes the basic theory of parametrically excited vibration Mathieu equation and the derivation of the instability domain the riser only by the top platform heave excitation pure parametric excitation vibration resonance mechanism reveals parametrically excited risers . Change the relationship between the riser and the marine environment parameters , the study parameters instability region and the design parameters , determine the key parameters to control deep-sea riser parametric resonances occur . Consider the lateral load caused by the wave and current , using the finite element method to analyze the vibration characteristics risers under parametric excitation and transverse wave and current force . Finally , to study the vibration characteristics of vibration and vortex-induced vibration of parametrically excited risers under the joint action . Studies have shown that when the the platform heave frequency equal to the natural frequency of the riser 2 times the first order parametric resonances , corresponding to the main parametrically excited unstable region is excited unstable region the most important part of the riser parameters . Higher order unstable region due to the presence of damping and quickly moved up , they are opposites tube parametric excitation stability is very small . The overall aim is to design riser , by adjusting parameters risers , riser frequency to avoid the cycle of the energy is concentrated waves of 4 ~ 12s ; presence of parametric excitation flow of vibration risers little impact , depth to control the life of the riser important parameters ; riser parametric excitation - vortex induced coupled vibration , the presence of parametric excitation of the vibration amplitude increases. When the parametric excitation frequency is equal to the riser of the first natural frequency twice riser vibration response maximum .

Related Dissertations

  1. Investigation on Vortex-Induced-Vibration of Flexible Risers with Buoyancy Modules,TB123
  2. Strength Assessment of Submarine Free Spanning Pinelines,TE973
  3. Research on Safety Operation of Two-Phase Flowing Pipeline Based on Vibration Test,TE89
  4. Analysis and Control of Dynamic Response of Suspended Pipeline in Shallow Seas,TE973
  5. Study on Three Dimensional Numerical Simulation of VIV Characteristics for Marine Riser,TE952
  6. Detection og Gas Plpeline Effusion and Analysis of Safe Operation,TE832
  7. Numerical Simulation on Vortex-Induced Vibration of Marine Riser,TE951
  8. Safety Assessment for Subsea Pipeline in Service,TE973
  9. Research on Elastic Tooth Seal of Steam Turbine,TK263
  10. Study on the Mechanism of Removal by Flow Induced Vibration,TE358
  11. Safety Assessment on Vortex-induced Vibration of Marine Drilling Riser System,TE951
  12. The VIV straight rod of circular cross-section of quayside rib inhibition of simulation experiments,TB535
  13. Strength Assessment for Deepwater Drilling Riser and Engineering Application,TE921
  14. Experimental Study on Vortex-induced Vibration Control of Cylinders,TB535
  15. Numerical and Experimental Studies on Vortex-induced Vibrations with Fluid-structure Interaction for Submarine Free-span Pipelines,TE973
  16. Prediction Methods for the VIV-induced Fatigue Damage in Deep Sea Risers,TE95
  17. Research on Vibro-Acoustics Character Caculation for Ocean Engineering Structure,P751
  18. Positive and Counter-analysis on Flow-induced Vibration of Radial Gate and Its Structural Optimization,TV663.2
  19. Numerical Analysis of VIV for Free Spanning Pipelines Considering Pipe-soil Interaction,P756.2
  20. Vortex-induced Vibration of Bridge Structure and Control,U441.3

CLC: > Astronomy,Earth Sciences > Oceanography > Ocean Engineering > Hoi Ha works > Underwater pipeline
© 2012 www.DissertationTopic.Net  Mobile