Research On The Influence Of Lightweight Structure On The Energy Efficiency Design Index

MPEC62 meetings in 2011 formally adopted the "new ship design of energy efficiency index (EEDI)", and began in 2013, in 2015 formally. EEDI is consumed energy conversion into CO2 emissions and ship effective energy conversion into the proportion of CO2 emissions index, is to measure whether the ship can reach the indexes of the green ship requirements. Compared to other green ship optimization method, can reduce the structure weight is mainly used in the design phase. Structure optimization has the advantage of not changing the ship's lines, don't change ship to decorate, can directly reduce the shipbuilding steel material. Due to the shrinking of steel material, on the one hand, can increase the part load, on the other hand can reduce the host power, effectively reduce the EEDI values. To improve the level of energy efficiency of the ship. So in order to safeguard the safety of the ship at the same time, reduce the weight increase of ship cargo capacity is to improve the new ship design index is one of the important technical measures of energy efficiency. Therefore, this article analysis of ship structure lightweighting influence on energy efficiency design index, so as to explore the new index is an effective method of energy efficiency of the ship.In view of the related research situation, this article research content includes the following three aspects:Firstly expounds the lightweight method based on optimum design of ship structure. This paper briefly introduces the structure of lightweight methods, combing the ship structure optimization design method and structure optimization design process of the ship. In 4500 DWT bulk carrier, for example, the structure optimization design was carried out, including the determination of design variable, objective function and constraint conditions, as a result, the hull structural steel expected a 4.30%?reduction in weight.For ship structure lightweighting for EEDI influence has carried on the qualitative and quantitative analysis, and the results of the analysis for the system in detail. For ship energy efficiency design index calculation formula and the meaning of each parameter and accessor methods are introduced, focusing on EEDI formula for the sensitivity analysis, including load sensitivity analysis and the host power sensitivity analysis. Structure weight, by increasing the load and two ways to reduce the host power, two factors affecting EEDI sensitivity.4500 DWT bulk carrier, for example, after the structure optimization design, through two ways, get the ship EEDI values did fall by over 4%, and reduce the host power EEDI after a drop more. Then, has carried on the ship to ship structural strength finite element analysis, systematically expounds the establishment of the finite element model, the grid division method, the boundary conditions and calculation conditions, the load and strength checking standards, and the ship's main structure intensity, to ensure that the optimization of the structure after the increase in load still meet the specification requirements.The language of VB, design and develop the EEDI calculation program of the ship. Application development for the needs analysis, this paper expounds the EEDI calculation program development process of the ship. The program includes two major functional modules:EEDI calculation module and a reference line regression analysis module.The research achievements of this paper can improve the level of new build ship energy efficiency in China provide guidance, for energy saving ship technology development and research in China.