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Determination of the Response Amplitude Operator(s) of an FPSO

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Document pages: 16 pages

Abstract: The need to reduce costs and the need to develop oil fields in increasing water depths have led to the use of floating structures. Among these structures, the floating production, storage and unloading (FPSO) device is the motion analysis considered in this paper. Under actual environmental conditions, it is necessary to accurately determine or predict the large amplitude motion of FPSO before any offshore operation. The purpose of this paper is to propose a detailed method for calculating the response amplitude operator (raos) of six (6) degrees of freedom using ANSYS Aqwa. The results show that for heave motion, with the wave moving from the front sea to the beam sea, the heave peak tends to move to a slightly higher dimensionless encounter frequency. A matlab source codeas developed to validate the result for heave motion at head sea. Although a small difference in predicted heave motion occurred, it is pertinent to note that the comparisons between results generated in the MATLAB program and ANSYS AQWA demonstrate generally good agreement, and the roll response of the FPSO is noted to be critical.

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