Development of a Calculation Method for Fuel Consumption of Ships in Actual Seas With Performance Evaluation
Development of a Calculation Method for Fuel Consumption of Ships in Actual Seas With Performance Evaluation
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船舶实海油耗计算方法的开发与性能评价
DOI：
10.1115/omae2013-11297
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
N. Sogihara
中科院分区：
文献类型：
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作者：
M. Tsujimoto;M. Kuroda;N. Sogihara
减少航运业温室气体排放。为此，EEDI(新船舶能源效率设计指数)和SEEMP(船舶能源效率管理计划)的规定已于2013年生效。为了提高船舶运行的能效，有必要对船舶的燃油消耗量进行准确的预测。在实际海面上，波浪效应是外力的主要组成部分。特别是，众所周知，水面以上的船头形状会影响波浪中的附加阻力。为了反映船头形状的影响，本文提出了一种考虑简化水舱试验结果的方法。利用水舱试验结果，可以准确地评价出水面上船头形状的影响，同时也具有较强的稳健性。在油耗方面，应结合船舶水动力性能和发动机特性来进行评价。特别是主机的工作极限，如扭矩极限和过载保护，对船舶水动力性能有很大的影响。在恶劣的天气条件下，主机的转速将降低到发动机的运行极限以下。这导致了船舶航速的大幅下降。为了防止燃油消耗的增加，一些船舶采用了以燃油指数作为燃油喷射指标的控制系统。本文提出了用燃油指数计算油耗的方法。1)建立了波浪附加阻力的计算方法，并结合短波中的简化水舱试验；2)计算方法与船上测量的比较；3)建立了考虑发动机在实际海域的运行方式的燃油消耗计算方法；4)将该方法与集装箱船上的测量进行了比较。通过这些研究，证实了本方法的有效性。版权所有
Greenhouse gas shall be reduced from shipping sector. For that purpose the regulation of EEDI (energy efficiency design index for new ships) and SEEMP (ship energy efficiency management plan) have been entry into force from 2013. In order to improve the energy efficiency in ship operation it is necessary to predict the fuel consumption accurately.In actual seas the wave effect is the dominant component of the external forces. In particular it is well known the bow shape above water affects the added resistance in waves. To reflect the effect of the bow shape a method which takes into account the result of simplified tank tests is proposed here. Using the results of tank tests the effect of the bow shape above water can be evaluated with accuracy as well as with robustness.Regarding to the fuel consumption it should be evaluated by combining the ship hydrodynamic performance with the engine characteristics. Especially the operating limits of the main engine, such as the torque limit and the over load protection, are affected to the ship hydrodynamic performance. In rough weather condition the revolution of the main engine will be reduced to be below the operating limits of the engine. This causes the large decrease of ship speed. To prevent the increase of fuel consumption, a control system by Fuel Index as an index of fuel injection has been applied to some ships. The calculation method for the fuel consumption by using Fuel Index is presented.In this paper following contents are reported; 1) development of a calculation method for the added resistance due to waves combined with the simplified tank tests in short waves, 2) comparison of the calculation method with onboard measurement, 3) development of a calculation method for the fuel consumption considering the engine operating mode in actual seas and 4) comparison of the method with onboard measurement of a container ship.From these investigations the availability of the present method is confirmed.Copyright © 2013 by ASME