Improvement of Service Performance of Coastal Cargo Ship in Rough Seas

对499 g.t.海岸货船“shoyu - maru”的服役性能进行了全面测试，得到以下结论：1)统计分析和频谱分析的比较表明，Raleigh分布对评估船舶在海岸波浪中的响应也是有效的。2)船舶响应在海岸波中的长期分布可以用同样的方法估计远洋船舶。③航速、风速和船舶响应随海域和季节的变化规律。4)风速损失受电流影响较大，风的影响较小。5)油耗可由实测船舶响应数据近似估计。6)货舱内的加速度分布可以通过实测船舶在桥上的响应数据来估计。7)货舱内的加速度分布可以从用条带法评估的船舶运动以及航海日志中显示的波浪数据中定性地估计出来。8)已显示船长考虑货舱最大加速度的操作图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.