Abstract: Energy efficiency is the main direction of innovation in today’s shipping industry. In particular, the Ship Energy Efficiency Design Index (EEDI), which came into effect by IMO on January 1, 2013, has pushed energy efficiency innovation to a whole new level. Since the introduction of marine shaft generator in the 1980s, it has been gradually applied to large container ships after successive major changes and innovations. However, there are no application case of shaft generator on a full-scale Very Large Crude Carrier (VLCC) due to the limitations imposed by many factors such as space and speed. The world’s first VLCC equipped with the shaft generator is optimized with consideration of the influences of the shafting torsional vibration equipment, bearing load distribution, machinery space layout and stern shaft extraction, etc. The shaft system of the VLCC is optimized and designed from three aspects of shafting arrangement, shafting torsional calculation and shafting alignment calculation. A feasible, efficient and forward-looking low-cost optimization design scheme of the shafting is then obtained by adjusting the number, material and diameter of the shafting, and the height of the main engine.

Key words: very large crude carrier (VLCC), shaft generator, shaft system, optimization design

摘要： 能源效率是当今航运界创新的主要方向,尤其是2013年1月1日IMO生效的船舶能效设计指数EEDI,将能源效率创新推上了全新的高度。船舶用轴带发电机自从上世纪80年代推出以来^[1],经过了历次重大变革创新后,已逐步应用于大型集装箱船。然而在大型VLCC油轮上,轴带发电机因受空间、航速等诸多因素限制,暂无实船应用案例。该文基于全球首艘配备轴带发电机的VLCC开展轴系实船优化研究,考虑轴系扭振设备、轴承负荷分配、机舱空间布置、艉轴抽出需求等诸多因素影响,从轴系基本布置、轴系扭振计算和轴系校中计算等3个主要方面对VLCC的轴系开展优化设计,通过调整轴系数量、轴系材质、直径以及主机高度等措施,获得可行、高效且具有一定前瞻性的低成本轴系设计优化方案。

关键词: 超大型油轮, 轴系, 轴带发电机, 设计优化