港口业船舶优化调度模型设计

以港口船舶计划调度为研究背景 ,分析了港口业计划调度的特征 ,提出了生产计划调度的系统框架 ,并在此基础上建立了以船舶拖期惩罚费用为最小 ,多种因素约束下的调度模型 ,将人工智能技术应用到实际生产调度中 ,实现分层次、分级研究多种资源约束条件下的计划调度和优化

Design Study of a Heavily Loaded Ice Class Propeller Using an Advance Panel Method

A design and optimization procedure developed and used for a propeller installed on a twin-semitunnel-hull ship navigating in very shallow and icy water under heavy load conditions is presented. The base propeller for this vessel was first determined using classic design routines under open-water condition with existing model test data. In the optimization process, a panel method code (PROPELLA) was used to vary the pitch values and distributions and take into account the inflow wake distribution, tunnel gap, and cavitation effects. The optimized propeller was able to improve a ship speed of 0.02 knots higher than the desired speed and 0.06 knots higher than the classic B-series propeller. The analysis of the effect of inflow wake, hull tunnel, cavitation, and blade rake angle on propulsive performance is the focus of this paper.