Improvement of Service Performance of Coastal Cargo Ship in Rough Seas

对499吨级沿海货轮“Shoyo-Maru”进行了实船使用性能的全尺寸测量，得到了以下结论：1)统计分析与频谱分析的比较表明，罗利分布同样适用于评估船舶在近岸波浪中的响应。2)用同样的方法可以估计船舶在近岸波浪中的响应的长期分布。3)船速的变化，4)风速损失受海流的影响较大，风的影响很小。5)根据船舶响应的测量数据可以近似估计燃油消耗量。6)从舰桥上的船舶响应的测量数据可以估计出货舱内的加速度分布。7)根据条带法估计的船舶运动和航海日志中显示的波浪数据，可以定性地估计出货舱内的加速度分布。8)船长考虑最大值时的运行图已显示货舱加速情况和防止货物溢出的操作流程图。

Full-scale measurement on the service performance for the 499 G. T. Coastal Cargo Ship 'Shoyo-Maru' has been conducted and the following conclusions are obtained :1)The comparison of the statistical and spectrum analysis shows that the Raleigh distribution is also valid for the evaluation of the ship responses in the coastal waves.2)Long-term distributions of ship responses in coastal waves can be estimated by using the same method for the ocean going ship.3)The variation of ship speed, winds and ship responses with the sea areas and seasons has been shown.4)The speed loss is considerably affected by the current and the effect of wind is quite small.5)The fuel consumption can be approximately estimated from the measured data of ship responses.6)The distribution of acceleration in the cargo hold can be estimated from the measured data of ship responses in the bridge.7)The distribution of acceleration in the cargo hold can be qualitatively estimated from the ship motions evaluated by the strip method along with the wave data shown in the Log-book.8)The operation diagram for the master considering maximum acceleration in the cargo hold and the flowchart for operation to prevent cargo spill has been shown.