Parametric Study of Semi Submersible Responses

Maidin, Zareina Bt Maidin (2010) Parametric Study of Semi Submersible Responses. [Final Year Project] (Unpublished)

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Abstract

Semi submersibles are being increasingly used for deep water oil and natural gas
development as they have better motion characteristics as compared to drill ships
and jacket structure due to their configuration and economical value. The knowledge
of motion response of the semi submersible under wave excitation force is of
importance in view of the workability and safety. This paper presents parametric
studies to find out the effect of various parameters on the motions of the semi
submersible model and to identify the crucial parameter in designing a semi
submersible with a favorable motion behavior. To begin with, structural properties
of Ocean America rig with 4 columns had been chosen. However, a few alterations
in dimensions were made such as column diameter and pontoon size. A wave
spectrum analysis was done by using the application of Pierson-Moskowitz (1964)
method and a wave profile was generated based on the wave spectrum produced.
Then, an analysis of wave excitation forces acting on the structure designed was
computed by applying the Morison equation. Subsequently, its motion response in
surge and heave due to regular and random wave was analyzed based on the linear
diffraction theory and Morison equation. An analysis of surge and heave responses
towards varying water depth and draft were performed. It was found that the water
depth in deep water has insignificant effect on the surge and heave responses.
Apparently, when draft increases, surge and heave motion decrease. In addition, by
varying the draft, it affects more on heave motion than it did for surge.

Item Type: Final Year Project
Departments / MOR / COE: Engineering > Civil
Depositing User: Users 5 not found.
Date Deposited: 05 Jun 2012 08:22
Last Modified: 25 Jan 2017 09:42
URI: http://utpedia.utp.edu.my/id/eprint/2989

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