Abstract: Cylindrical floating drilling storage offloading (FDSO) is tended to develop for future. It is built by superimposing construction directly on the water using floating manufacturing method, which has significant advantages of low cost, high efficiency and adaptability. In the technical rules of segments division, it is necessary to meet the accuracy requirements to reduce the number of segments, which again with ensuring the stability which may be caused excessive effect by segments weight during the construction process. As facing these contradictions, a new process principles and mathematical optimization model with ideal conditions assuming of stability analysis is proposed, the model can integrate segments before lifting, so that reasonable division method of segments can be obtained. Then calculation process and examples of authentication are proposed. With this approach, it ensures the precision of the construction, fewer welds, stability requirements and high efficiency.

Key words: Division method of segments, Floating drilling storage offloading, Floating manufacturing, Mathematical optimization, friction-induced vibration, joint surface topography, mode coupling instability, fractal theory