Research On Collision Avoidance Methods Based On The Field Of Ships

In recent years,with the rapid development of global economy and shipping,the number of ships on the sea has been increasing.Moreover,due to the influence of waters,Bridges and complex navigation environment,the maritime traffic situation has become more and more complicated,and maritime traffic accidents occur frequently,causing huge losses to people’s lives and property.Therefore,how to prevent the occurrence of maritime traffic accidents and provide reasonable collision avoidance methods are urgent problems for maritime traffic safety.However,some existing methods of ship collision avoidance mainly focus on the study of open water,and do not take into account the important factor of ship field.Therefore,a new ship collision avoidance method is proposed in this thesis.The ship domain model is used as the collision avoidance factor to study ship collision avoidance methods.The main work of this thesis is as follows:Firstly,the research background and significance of ship collision avoidance are expounded,the development and research status of domestic and foreign scholars on ship collision avoidance methods are summarized,the deficiencies of existing collision avoidance methods are sorted out,and a collision avoidance method based on ship field is designed according to the above deficiencies.Secondly,in view of the problem of collision risk in the course of navigation,the basic theories of navigation conditions of ships,namely narrow waterway and ship field,are explained.In order to reasonably obtain the collision avoidance path of ships,the collision risk assessment methods of ships without area intersection and with area intersection are presented respectively.Third,in view of the important factor that the ship field should be taken into account when the ship navigates in the narrow waterway,the modeling methods of the traditional ship field model and the ship reachable-set domain model are presented,and the solving process of the ship collision avoidance method based on the traditional ship field and the ship collision avoidance method based on the reachable-set is presented,and the collision risk is compared with other paths.The results show that this method can be applied to any type of ship domain model with the lowest collision risk.Finally,in order to verify the application of the collision avoidance method in the actual test,a virtual reality simulation was carried out and demonstrated through Unity 3D.In this thesis,part of the water area of Qingshui River in Wafangdian,Dalian City is selected on the map,and the narrow waterway is used as the environment to test the collision avoidance method of ships in this thesis,and a collision avoidance path with the lowest navigation risk is obtained.In order to better display the collision avoidance method in this thesis,the 3D modeling software 3DS Max was used to build the 3D model of the ship,and the ship domain model and the simulation scene of the narrow waterway were built in Unity 3D,and the above algorithm was verified by virtual reality simulation.In summary,the research work of collision avoidance method based on ship domain carried out in this thesis can be applied to ship collision avoidance in narrow waterway and applicable to any type of ship domain model.The research results provide a new idea and method for the research of ship collision avoidance in the field of ship navigation,which is of great significance to ensure the safety of water traffic.