A Research On Dynamic Ship Domain Models Based On The Changing Of Navigable Environment

The ship domain is one of the key research contents of marine traffic engineering and maritime experts and scholars.The research in the ship.domain also has important value and significance for automatic collision avoidance of ships,assessment of collision hazards,and measurement of traffic capacity.In recent years,the research of unmanned ships is in full swing.Intelligent collision avoidance is the core of the research field of unmanned ships,and the ship domain is the key in intelligent collision avoidance.Its importance is self-evident.In view of the many models in the current research in the ship field,the consideration factors are not comprehensive,and the use conditions have limitations,etc.,in order to comprehensively understand the influencing factors in the ship domain,the characteristics of each model in the ship domain,the influencing factors considered and their applicable conditions are introduced by combing the typical ship domain models at home and abroad,which clarifies the direction of the research in this article.In order to fully understand the influencing factors in the field of shipbuilding,the logic tree method was used to construct a hierarchy analysis chart of influencing factors in the ship domain comprehensive analysis of environmental factors,ship factors,the "1972 International Maritime Collision Avoidance Rules"(hereinafter referred to as "the Rules")The mechanism of the influence of human factors on the ship domain model;the questionnaire survey method is used to quantitatively calculate the corresponding' influencing factors,and the weight of each influencing factor is analyzed.Combined with the research results of ship maneuverability,the scale of the ship domain model in the narrow water area in the horizontal direction was optimized,and the ship domain model in the vertical direction was determined in consideration of the inter-ship effect,the wall effect and the 'influence of wind current on the ship motion.Height of the boundary,which in turn improves the existing ship domain model.The dynamic optimization of the 3D ship domain boundary based on the navigation environment was achieved through the scale factor.Select the typical ship domain model in different waters,use Matlab and combine the selected typical ship domain model to design a dynamic ship domain model software.Combining the actual conditions of the Dasanshan waterway and its adjacent waters with the Nanjing Bridge waterway,the results show that the software can quickly and accurately calculate the ship domain model in different navigation environments,and can be visually displayed.The software has wide application value,and lays a foundation for the subsequent academic research of the ship domain model and the realization of the ship's intelligent collision avoidance.This article establishes a dynamic ship domain model based on changes in navigation environment.In subsequent practical applications,sensors on the ship can be connected to obtain relevant navigation environment parameters,reducing the time for personnel entry and improving the accuracy of data.The basic ship domain model selected in this paper may have subjective limitations.In the subsequent research,the law of the impact of various factors on the ship domain model will be deeply explored,so that the newly constructed software can better meet the application in many aspects such as automatic collision avoidance of ships,navigation capacity of waterways and risk assessment of water navigation.