英语翻译· 船体方形系数因素、主机设定的推进器转速/船舶装载货物的变化会致输出功率不同,燃料消耗亦不同.另外,燃料消耗使

英语翻译
· 船体方形系数因素、主机设定的推进器转速/船舶装载货物的变化会致输出功率不同,燃料消耗亦不同.另外,燃料消耗使航行中燃料舱燃料减少,船舶纵向力矩变化而发生吃水差变化.船模试验和稳性报告书信息表明,适当调整船舶吃水差,满足推进器一定浸深要求,保证推进器的推进效率,可以减少水的阻尼作用,达到减少燃料消耗.
一般在船舶航行时,保持适当的艉倾是有利的.这样船舶的推进效率较好,可以节约燃油.船舶进出港口,为减少受风面积,保持舵效,满足港内操纵需求,一般规定首吃水不小于2％的船长,尾吃水不小于3％的船长.
在配载时一般应保证尾吃水大于首吃水.但是艉倾不能过大,一是会加大船舶的盲区不利于航行安全,二是容易造成尾部上浪.在有吃水限制的港口特别是要侯潮进出的港口,在配载时应保持平吃水有利于船舶的顺利进出.
· 建立采用计算机数学模型,合理调正最佳纵倾,优化航速.
· 为获得最佳吃水差,航行中调整吃水差常用的方式是压进、排出压载水或内循环调整压载水舱压载水以改变燃料消耗引起的纵向力矩的变化.
· 调整压载水应该考虑当时海域环境、气象条件以求船舶安全,考虑管辖国领海的压载水管理规则以及国际海洋防污染公约（Marpol Annex 1 Regulation 18.2）所要求的压载水管理计划.
· 压载水对外排放应在压载水管理计划中体现.调整吃水差起始时间和实际吃水差记入《航海日志》.

Hull block coefficient, host factors set propeller speed / ship goods loading change will cause the output power, fuel consumption is also different. In addition, the fuel consumption makes navigation in fuel tank fuel reduction, ship longitudinal moment change trim changes. Ship model test and stability report information that, properly adjust the ship propeller immersion, meet certain requirements, ensure the propeller efficiency, can reduce water damping effect, reduce fuel consumption.
Generally in the ship, maintaining proper stern slope is favorable. Such a ship propulsion efficiency is good, can save fuel oil. The ship out of port, in order to reduce the wind area, maintain steerage, meet the demand the manipulation, general provisions first draft of not less than 2% captain, aft draft is not less than 3% of the captain.
In the stowage generally should ensure that the draft aft is greater than the first draft. But stern slope can not be too large, one will increase the ship blind is not conducive to the safety of navigation, two is easy to cause the tail water. In a draft restricted port especially to tide in and out of the port, in loading should be flat draft to ship the smooth import and.
Establish the mathematical model, reasonable adjusting optimum trim, optimization speed.
To get the best draft difference, the voyage to adjust the draft difference common way is pressed, discharge of ballast water or inner loop adjusting ballast ballast water to change the fuel consumption caused by the change of the longitudinal moment.
· adjustment of ballast water should be considered when the sea environment, meteorological conditions in order to ship safety, considering China's territorial waters under the jurisdiction of the ballast water management rules and international marine pollution prevention Convention ( Marpol Annex 1 Regulation 18.2 ) required by the ballast water management plan.
·ballast water discharged outside should be embodied in the ballast water management plan. To adjust the trim the start time and the actual draft difference in the " log ".