NUMERICAL SIMULATION ON MOTION OF SEVEN CYLINDRICAL FPSO IN DIFFERENT LOADING CONDITIONS

Abstract

This paper is proposed to present the difference of motion response in wave of SEVEN’s Cylindrical FPSO when the structure is in full loaded and when it is in ballast condition. Based on the theory, the motion of the floating structure will be influenced on the weight of FPSO. Where, when the weight of the FPSO changed, the natural frequency of the motion will be changed. This will lead to shift of the peak response frequency and amplitude of the motion. To analyse the motion of the FPSO in different loading condition, the study was conducted by simulate the motion of FPSO in wave by using commercial software. The heave and pitch of the FPSO are focused. The added mass, damping coefficient, wave loading and Response amplitude operator of the FPSO in different loading condition are presented in the paper. From the simulation results, it is observed that the peak heave response of the FPSO in full loaded condition happened at lower frequency as compared to ballast condition. However, the peak pitch response of the FPSO in full loaded condition happened at higher frequency as compared to ballast condition. This result obtained is due to the displacement of the FPSO at full loaded condition is higher than ballast condition but the GM value is smaller at full load condition.