강제가진에 의한 계류라인의 동적 거동해석

Abstract

It is very important to control the location and movement of ships, structures, and equipments in the sea. Mooring is an important method to keep location of structures against wind, wave and current. This study deals with the dynamic analysis of immerced mooring line, and the tension variation of mooring line by forced oscillation.

In this study, governing equations are set up for the dynamic behavior analysis of mooring line and an implicit finite difference algorithm is employed for three-dimensional equation. Non-linear effect is considerd and solved by Newton-Raphon iteration. The tension of mooring line by forced oscillation is compared with calculation by MOSES (Multi-Operational Structural Engineering Simulator), which is used as a commercial business program. A case study is carried out for a typical buoy system and a floating breakwater.

In the buoy system, it is found that tension variation is changed non-linearly and vertical oscillation has more non-lineari쇼 than horizontal oscillation. And tension is increased in proportion to forced amplitude and frequency. Especially, tension is increased in proportion to a square of frequency.

For the floating breakwater case, it is found that tension at the anchor point has more non-linearity than the top point.