In this research, a software package especially conceived for educational/research purpose was developed for deep water offshore risers. Emphasis was placed on user interfaces, automatic data generation and graphical display of results in an effort to minimize the need for cumbersome and time consuming data preparation and lengthy output that are normally found in commercial/research programs. A state-of-the-art workstation approach was developed with emphasis on procedural programming languages, interface languages and graphical display. The riser program is easy to use, yet it is capable of producing real time graphical simulation of structural response of risers in deep water. During the course of this project, it became clear that traditional approach could not yield realistic predictions of structural response of deep water risers. Deep water risers are sensitive in their axial vibration characteristics in the hanging condition during a severe storm. Initial conditions of the sinusoidal motion can exaggerate the axial vibration component and lead to results that are far different from those expected of a steady state condition. This problem had been addressed and solved using transition curves into the sinusoidal motion. The transition curves provide a simple, yet effective way to obtain an approximate steady state condition without exaggerating the riser’s axial vibration response. General considerations for the software package as well as theory are presented. Two numerical examples for a deep water riser at an ocean depth of 5,200 feet are presented, showing how the student/researcher can analyze the problem in a user friendly environment, complimented by the graphical interface developed.
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