ABSTRACT

The present work considers application of the state-of-the-art numerical tools, such as LS-Dyna, in analysis of the floating storage regasification unit (FRSU) response affected by the waves, but also by the mooring lines and fenders, forming together a highly non-linear problem. A time-domain simulation methodology for solving the problem described is presented. Firstly, hydrodynamic properties of a rigid floating vessel are determined, that is ship hydrostatic, damping and added mass properties. Linear hydrodynamic theory based on the potential flow model is applied to find solution in frequency domain. Then, mapping hydrodynamic properties from the frequency to the time domain is conducted by LS-Dyna MCOL module. Secondly, a model is made in LS-Dyna considering realistic non-linear properties of mooring lines and fenders to get coupled response of FSRU due to waves and mooring system. Forces in mooring system, ensuring safe FSRU station keeping, are then determined, and obtained results discussed.

摘要

目前的工作考虑了最先进的数值工具的应用，如 LS-Dyna，在分析受波浪影响的浮式储存再气化装置 (FRSU) 响应中，也受系泊索和护舷的影响，形成一个高度非线性的问题。提出了一种用于解决所描述问题的时域仿真方法。首先，确定刚性浮船的流体动力学特性，即船舶静压特性、阻尼特性和附加质量特性。应用基于势流模型的线性流体动力学理论在频域中寻找解。然后，LS-Dyna MCOL 模块将水动力特性从频域映射到时域。其次，在 LS-Dyna 中建立了一个模型，考虑了系泊缆和护舷的实际非线性特性，以获得 FSRU 由波浪和系泊系统引起的耦合响应。然后确定系泊系统中的力，确保安全的 FSRU 站保持，并讨论获得的结果。