LM-FPSO의 운동 응답에 대한 SBT의 동유체역학적 특성 고찰

Abstract

The Low Motion FPSO (LM-FPSO) is a new concept design which has noticeably low heave motion response compared to the general ship shaped FPSO. LM-FPSO is able to utilize Top-Tensioned Risers (TTRs) or Steel Catenary Risers (SCRs). The remarkable feature of the LM-FPSO is a Solid Ballast Tank (SBT) which is located under main hull and is connected with tendons. According to the recent study, the SBT improves the motion response of the LM-FPSO because the added mass and damping increase due to the SBT. The natural period also increases approximately double that of hull without SBT. The main purpose of this study is to investigate the hydrodynamic effect of various shape, dimension and structure of the SBT, whichis related with heave motion response of the LM-FPSO. Rectangular shaped SBT is selected as base model. The frequency domain analysis and time domain analysis were conducted by using KRISO’s LINDO and MOLINA, respectively. The comparativestudy was performed by changing the type of the SBT. The heave damping of the LM-FPSO was obtained by a model test.