Fully Coupled Analysis of an Offshore Deck Mating Operation of a Large Topside Module
- Sa Young Hong (Korea Research Institute of Ships and Ocean Engineering) | Bo Woo Nam (Korea Research Institute of Ships and Ocean Engineering) | Yoon-Jin Ha (Korea Research Institute of Ships and Ocean Engineering) | Seok Won Hong (Korea Research Institute of Ships and Ocean Engineering)
- Document ID
- International Society of Offshore and Polar Engineers
- International Journal of Offshore and Polar Engineering
- Publication Date
- March 2018
- Document Type
- Journal Paper
- 40 - 45
- 2018. The International Society of Offshore and Polar Engineers
- pendulum dynamics, fully coupled analysis, LMU, model test, Offshore deck mating, topside, FLNG
- 1 in the last 30 days
- 39 since 2007
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A fully coupled analysis is carried out to evaluate the offshore mating operation for a large heavy topside module on a deck of floating liquefied natural gas (FLNG). Fully coupled hydrodynamic interactions are considered between a crane vessel lifting the heavy topside module and the FLNG. Multiple crane wires and slings are modeled with linear springs, while the leg mating unit (LMU) guide is modeled with bilinear springs. Special attention is paid to the accurate prediction of coupled hydrodynamic coefficients and pendulum dynamics of heavy hanging objects. Simulation results are validated by comparing model test results on key parameters affecting the deck mating operations on-site. Good agreement has been obtained between the simulations and the model tests.
Because of the increasing need of an environmentally friendly fuel supply, liquefied natural gas (LNG) has become one of the emerging resources to replace oil as well as renewable energies such as solar, offshore wind, etc. The recent drastic fall of oil prices requires a variety of innovations for more economic solutions and earlier first oil. In spite of state-of-the-art exploration technology, it is not uncommon to find oil and gas fields that have much larger or smaller reserves than first estimated. Especially in the case of a gas field of much larger reserves, it is necessary to accommodate additional large topside modules on-site. In such a case, more effective and safer installation scenarios should be prepared. The assurance of safety and operability of installation of the large topside module on-site should be checked under combined wind, wave, and current conditions because the large topside module can cause a serious hazard on the existing floating LNG (FLNG) in case of poor installation scenario and operation.
For the performance evaluation of floating crane operations, the time-domain dynamic analysis has been widely used in the design stage to predict the motion response and determine the capacity of the installation equipment and the weather windows. Clauss et al. (2000) presented a comparative study of the operation capabilities of floating cranes. They also reported the nonlinear phenomena of the coupled system of floating structures and swinging load. Ellermann et al. (2002) discussed the nonlinear dynamics of floating cranes. Cha et al. (2010) applied multibody system dynamics to study the dynamic response simulation of heavy cargo suspended by a floating crane. Similarly, Park et al. (2011) presented the dynamic factor analysis based on multibody dynamic simulations for a floating crane and cargo considering an elastic boom. Nam et al. (2015) developed a time-domain analysis program for floating crane vessel systems. They investigated the effect of a heave compensator during a lowering operation of subsea equipment.
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