To optimize the speed of container ships so as to reduce fuel consumption,considering the disturbance of wind and wave,a model for determining reduced speed is designed according to the power relationship of underway ships.The wind and wave disturbance forces applied to the hull and the deceleration range of ships under different conditions of wind and wave can be obtained by the model.The model is compared with the existing fitting model,which shows that the resultant force of wind and wave from the forward of the beam and abaft the beam hinders the navigation of ships.The speed loss is larger when the wind and wave are from the forward of the beam;the speed loss is lower when the wind and wave are abaft the beam;in the same wind and wave condition,the speed loss becomes lower with the speed being up.The proposed model is more applicable than the fitting model.By the model,the reduced speed can be estimated accurately.

船舶运动模式的提取是轨迹数据分析的重要任务,它可以为船舶异常行为的检测提供参考依据,同时也可以作为航路规划和定线制设计的技术指标.针对现存的聚类算法大多为了追求效率而忽略了运动轨迹特征的问题,对聚类算法中的轨迹结构距离进行改进,将其作为轨迹相似度的评价标准.采用无监督DBSCAN聚类算法实现船舶运动模式的提取.利用琼州海峡船舶自动识别系统(Automatic Identification System,AIS)数据,对该水域的船舶运动模式进行提取,获得行驶于该水域的船舶运动轨迹分布以及各类轨迹中转向区域的分布,其中船舶运动轨迹包括从琼州海峡东峡口向西航行的船舶轨迹,从琼州海峡西峡口向东航行的船舶轨迹,从秀英港前往海安港的船舶轨迹,从海安港前往秀英港的船舶轨迹和从琼州海峡东峡口前往海口港的船舶轨迹.将最终的聚类结果应用于电子海图显示与信息系统(Electronic Chart Display and Information System,ECDIS)上,实现了对船舶的动态监控仿真.

With enhancing of environmental awareness, shipping market is suffering a downturn that makes shipping companies reduce the fuel consumption for controlling ocean pollution and operating costs when transportation tasks can be completed. Fuel consumption is relation to the speed which is influenced by climate such as wave, wind and so on. To deal with speed optimization problem, the mix integer non-linear mathematical model is proposed based on the influence of wave and wind that is climate factor. Due to the complex of mix integer non-linear problem, it is difficult to be solved. Considering the actual situation of ships, the sailing speed is dispersed. At the same time, we transform the MINP model into MILP. The CPLEX is used to solve MILP model efficiently. By the algorithm of dispersing speed, the optimal speed and the number of ships that is in different voyages with various wave and wind conditions can be obtained. Experiments indicate that the method can apply reasonable ship schedules for shipping companies.

On the application background of ZSP series pneumatic conveying devices, discussion was laid stress on the improvement in a kind of pneumatic conveying devices based on programmable logic controller (PLC). ZSP series pneumatic devices could achieve multi-point material discharge, being convenient to switch over and large in conveying quantity, working in low air pressure (0.59 MPa), and make a choice between automatically countinuous material feeding and manual material feeding. Sand used in machine moulding line was kept to comply with standards in quality and qantity to ensure that every kind of material and auxiliary material needed for moulding can be added at any time.