针对船舶碰撞严重威肋、着船舶水上航行的安全问题,提出多层次多目标重点避让优选模型(Multi level and multi target key avoidance optimization model,MLMTKAO)。通过选取航道船舶碰撞危险度作为状态变量,船舶会遇方式、风速和能见...针对船舶碰撞严重威肋、着船舶水上航行的安全问题,提出多层次多目标重点避让优选模型(Multi level and multi target key avoidance optimization model,MLMTKAO)。通过选取航道船舶碰撞危险度作为状态变量,船舶会遇方式、风速和能见度作为控制变量,利用多层次多目标重点避让优选模型分析了碰撞危阶度和僻计难易程度对重点僻计船决策的影响。实验表明:该方法具有较高的执行效率和可扩展性,有效地避免了由于难以确定目标而造成的决策的主观任意性。展开更多
At intensive winter navigation, the ships should separate under movement on opposite courses or make overtaking of slowly moving cargo vessels in the water areas covered with ice. Under navigation within ice channel, ...At intensive winter navigation, the ships should separate under movement on opposite courses or make overtaking of slowly moving cargo vessels in the water areas covered with ice. Under navigation within ice channel, possibilities for maneuvering are reduced; therefore, danger of collision of ships exists. The ice floes between vessels hulls and outside are the major factors defining values and direction of side force and yawing moment that arise on their hulls during divergence. Ice loads on the ship hull exceed considerably the loads caused by water flow around hull. Performed previously experiments in the ice basin have detected that besides increase of side force and yawing moment modules the change of side force directions occurs during the divergence of vessels in comparison with same maneuvering on water area without ice cover. Article contains the detailed problem definition and mathematical model of ships interaction during opposite passing by or overtaking and technical approach to computation of loads on vessels hulls. As example of strategy application, the simulation of loads on overtaking ship was performed, and main results of computations are presented. Outcomes of investigation are character of variation of side force and yawing moment during passage along overtaken ship and dependence of the peak values of additional ice resistance, side force and yawing moment on beam distance between vessels and thickness that are contained in the article.展开更多
文摘针对船舶碰撞严重威肋、着船舶水上航行的安全问题,提出多层次多目标重点避让优选模型(Multi level and multi target key avoidance optimization model,MLMTKAO)。通过选取航道船舶碰撞危险度作为状态变量,船舶会遇方式、风速和能见度作为控制变量,利用多层次多目标重点避让优选模型分析了碰撞危阶度和僻计难易程度对重点僻计船决策的影响。实验表明:该方法具有较高的执行效率和可扩展性,有效地避免了由于难以确定目标而造成的决策的主观任意性。
文摘At intensive winter navigation, the ships should separate under movement on opposite courses or make overtaking of slowly moving cargo vessels in the water areas covered with ice. Under navigation within ice channel, possibilities for maneuvering are reduced; therefore, danger of collision of ships exists. The ice floes between vessels hulls and outside are the major factors defining values and direction of side force and yawing moment that arise on their hulls during divergence. Ice loads on the ship hull exceed considerably the loads caused by water flow around hull. Performed previously experiments in the ice basin have detected that besides increase of side force and yawing moment modules the change of side force directions occurs during the divergence of vessels in comparison with same maneuvering on water area without ice cover. Article contains the detailed problem definition and mathematical model of ships interaction during opposite passing by or overtaking and technical approach to computation of loads on vessels hulls. As example of strategy application, the simulation of loads on overtaking ship was performed, and main results of computations are presented. Outcomes of investigation are character of variation of side force and yawing moment during passage along overtaken ship and dependence of the peak values of additional ice resistance, side force and yawing moment on beam distance between vessels and thickness that are contained in the article.
