Structural Dynamic Response Of The Ice Navigating Ship In Level Ice Load

Arctic regions are rich in oil resources,natural gas,fishery resources and minerals,and it becomes possible to explore resources and the arctic channel as the global climate getting warmer and warmer.As the ship sails in level ice,it could never avoid ice collision,which would increase the probability of damage,in the event of the case such as destruction of ship structure and oil and gas leakage.And it would cause serious loss of life and estate to the nation and its people.In this background,this thesis mainly does research about the ice load calculation and structure response and establish a method to predict the safe velocity of ship in different ice condition.The main content of this article is listed as follows:1.The form of the failure mechanism of the sea ice are analyzed,and experience formula and six-degrees-freedom theoretical method are used to calculate the ice load and the six freedom degree motions by using Fortran code based on the numerical discrete of the ice floe and the hull.2.The collision force,structural dynamic responses of damage deformation of the ship,the change of the ice navigating ship velocity and the energy dissipation are got by using DytranMSC.based on the elastic-plastic theory and the nonlinear finite element theory.And the ice load assessment coefficient LA is defined to estimate the ice load level of ship-ice collision.3.The effects of a series of parameters such as ice thickness,ship velocity,ice modulus of elasticity and energy dissipation are analyzed by using lSobo ? method.4.Genetic algorithms is used to optimize BP neural network to predict ice load assessment coefficient LAin any ice condition and the relation of safe velocity and ice thickness of a oil ship is got by combining the BV rules and the power limit.