Mathematical Model Of Ship Manoeuvring And Its Application Under Broken Ice

The serious trade detours in the three major economic regions of the world(the United States,the European Union,and East Asia)have led to low shipping efficiency and increased costs.The deepening of trade cooperation between countries and the development of world shipping require the Arctic route which as a new route connecting the Pacific and the Atlantic.However,due to the lack of infrastructure and navigation support capabilities along the Arctic,there are some difficulties and risks in Arctic commercial navigation.Therefore,this paper studies the prediction of ice resistance and motion modeling of polar ships in broken ice channel.This paper analyzes the research of mathematical model of ship manoeuvring motion and the interaction between ship and broken ice.Although there have been some achievements in the research on the maneuverability of ships in open waters,there are obvious deficiencies in the research on the maneuverability of ships in broken ice areas.In order to study the ice load on the ship in the broken ice channel,ANSYS\LS-DYNA finite element software was used to simulate the YUPENG model in the broken ice channel.Through building a numerical calculation model,the Solid Works software is used to carry out the geometry model of the YUPENG scale ship model.Altair-Hyper Works software is used to establish a finite element mesh model of the YUPENG.The two-dimensional Vornori map geometrically cuts the waterway ice fragments to create random ice waterways with different densities.The broken ice resistance is obtained by the finite element software.the ship type represented by YUPENG is taken as the research object,which analyzes the contact characteristics and motion state of ship and broken ice.The results show that ship speed,broken ice concentration and ice thickness are the main factors affecting ship resistance.Different broken ice concentration and ship speed have great effect on ship resistance.Based on the Colbourne method,the full scale ship resistance value is transformed through the relationship between the ice broken resistance coefficient and the Froude number.The predicted resistance value of the YUPENG in the broken ice channel is obtained.Compared with the resistance value calculated by the Finnish Swedish ice class rules(FSICR),the results obtained in this paper are reasonable.In order to verify the correctness of the model,this paper establishes three degrees of freedom motion model of the ship based on the idea of the MMG separation model.In additional,this paper calculates the force in the broken ice channel based on the mature empirical formula.The mathematical model of ship motion is simulated by C + + programming language.Taking YUPENG as an example,the direct route test and the turning test were carried out.The correctness and rationality of the model are judged by the simulation test results.This paper perfects the mathematical model of ship manoeuvring motion in ice area of the navigation simulator,which can help us acquire prediction of the ship maneuverability and provide certain guidance and reference for sailing in the broken ice channel.