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King Abdullah University of Science and Technology

1. Alfosail, Feras. Analysis of the Nonlinear Static and Dynamic Behavior of Offshore Structures.

Degree: 2015, King Abdullah University of Science and Technology

Understanding static and dynamic nonlinear behavior of pipes and risers is crucial for the design aspects in offshore engineering fields. In this work, we examine two nonlinear problems in offshore engineering field: vortex Induced vibration of straight horizontal pipes, and boundary layer static solution of inclined risers. In the first study, we analyze the effect of the internal velocity of straight horizontal pipe and obtain the vortex induced vibration forces via coupling the pipe equation of motion with the recently modified Van Der Pol oscillator governing the lift coefficient. Our numerical results are obtained for two different pipe configurations: hinged-hinged, and clamped- clamped. The results show that the internal velocity reduces the vibration and the oscillation amplitudes. Also, it is shown that the clamped-clamped pipe configuration offers a wider range of internal velocities before buckling instability occurs. The results also demonstrate the effect of the end condition on the amplitudes of vibration. In the second study, we develop a boundary layer perturbation static solution to govern and simulate the static behavior of inclined risers. In the boundary layer analysis, we take in consideration the effects of the axial stretch, applied tension, and internal velocity. Our numerical simulation results show good agreement with the exact solutions for special cases. In addition, our developed method overcomes the mathematical and numerical limitations of the previous methods used before.

Subjects/Keywords: Vortex induced Vibrations; Van Der Pol Oscillator; Boundary Layer Petrubation; Inclined Riser; Riser Static Solution; Pipe Vibratrations

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Alfosail, F. (2015). Analysis of the Nonlinear Static and Dynamic Behavior of Offshore Structures. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/559183

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Alfosail, Feras. “Analysis of the Nonlinear Static and Dynamic Behavior of Offshore Structures.” 2015. Thesis, King Abdullah University of Science and Technology. Accessed July 22, 2019. http://hdl.handle.net/10754/559183.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Alfosail, Feras. “Analysis of the Nonlinear Static and Dynamic Behavior of Offshore Structures.” 2015. Web. 22 Jul 2019.

Vancouver:

Alfosail F. Analysis of the Nonlinear Static and Dynamic Behavior of Offshore Structures. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2015. [cited 2019 Jul 22]. Available from: http://hdl.handle.net/10754/559183.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alfosail F. Analysis of the Nonlinear Static and Dynamic Behavior of Offshore Structures. [Thesis]. King Abdullah University of Science and Technology; 2015. Available from: http://hdl.handle.net/10754/559183

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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