Leg mating Units의 탄성패드 설계 및 성능 해석

Abstract

This research is to design a typical offshore leg mating unit(LMU) of 20,000 tonnes class with elastomeric pad. Mating is one of float-over installation method for floating offshore structure. LMU is generally used in absorption of impact between offshore top side structure and offshore jacket in installation process. LMU is composed of combination of steel and hyperelastic material having a type of stack plate in vertical direction. Elastomeric pad design is very important to determine a performance of whole LMU. These components have its functional implications and structural design consequences. In order to secure a performance of LMU, we performed to analysis an initial sizing and finite element analysis for LMU with elastormeric pad. A parametric study is carried out by changing design variables of width, height and thickess of elastomeric pad and the thickness of steel spacer plate. Three types of materials for rubber fenders are taken into account where Mooney-Rivlin coefficients are determined based on the experimental data. This paper provides designing process used for elastomeric pad to determine LMU dimensions considering motions of floating offshore structure. It is determined the proper size and stiffness of LMU using recognied code and standard and finie element analysis. It is concluded that elastomeric pads appear to be effective with respect to the reaction performance in verical direction, but are