Investigation Of Seakeeping Influence On Ship Energy Efficiency Design

Climate warming has become one of the most serious challenges for the human beings. From the "Kyoto Protocol" of 1997 to "Copenhagen Accord" of 2009, people are making unremitting efforts to reduce the greenhouse gas emissions in recent years. With the increasing of the global trading, the shipping industry, which is the main mode of transport for global trading, its greenhouse gas emission has becoming a serious problem and is being paid more attention. As we all know, carbon dioxide(CO2)is the most important greenhouse gas from the ship emission, so how to reduce the CO2 emissions is becoming a hot topic.The MEPC (Marine Environment Protection Committee), which is a member of IMO (International Maritime Organization), concerned about the impact to the ship energy‐efficiency due to sea condition and raised the EEDI(energy‐efficiency design index) concept in recent years. This new concept is designed to limit CO2 emissions from ships so that to improve the ships design level and to promote the development of energy‐saving ship design. This paper is based on the MEPC reports during the past two years and makes detailed research about the Fw (the decrease of ship speed), which is one of the most important coefficient in EEDI.In this paper, for the first of all, there are some introduction about the definition, scope and operation mechanisms of EEDI, and then, more attention is paid on the Fw, which is one of the most important coefficient associated with sea‐keeping performance in the EEDI. The calculation method for Fw is mainly based on the method proposed by Japan in the MEPC conference. There are a lot of numerical simulation results for different kinds of ships in the paper and compared with the experiments results, from which shows that there are some problems of Fw. At present, how to calculate the Fw is still in debate,so the achievement of this thesis has a certain reference value for the research about the evaluation method of Fw.