The driving necessities of cost reduction and the need to develop fields at ever\nincreasing water depths have led to the use of floating structures. Among\nthese structures are the Floating Production Storage and Offloading (FPSO)\nunits whose motion analysis is considered in this paper. In actual environmental\ncondition, it is required to accurately determine or predict large amplitude\nmotion of the FPSO before any offshore operation. This paper seeks to present\na detailed method of computing the Response Amplitude Operator(s) (RAOs)\nfor the six (6) degrees of freedom using ANSYS AQWA. The results indicate\nfor Heave motion a tendency for the heave peak value to move slightly higher\ndimensionless encounter-frequency as the wave moves from Head sea to Beam\nsea direction. A MATLAB source code was developed to validate the result for\nheave motion at head sea. Although a small difference in predicted heave motion\noccurred, it is pertinent to note that the comparisons between results generated\nin the MATLAB program and ANSYS AQWA demonstrate generally\ngood agreement, and the roll response of the FPSO is noted to be critical.
Loading....