Research On Model Test And Numerical Simulation Method Of Ship Ice Collision

With the large-scale development of ocean in the Arctic region,the problems of sea ice disaster and collision between sea ice and ships that affect the safety and operation of polar ships are becoming increasingly prominent.These problems will cause injuries and deaths of crew and unpredictable economic losses.Therefore,the research on the collision between polar ships and sea ice is an important research that cannot be avoided in the development of polar regional resources.Consequently,the study of ship ice collision can give guides for design of ship structure on the one hand,and predict and evaluate the damage of ship structure on the other hand.Because the field investigation costs a lot of money,the high expense,complicated conditions and execrable environment,this paper finds a kind of non-refrigerated model ice to verify its physical and mechanical properties,so that it can replace the sea ice to carry out the collision model test research of hull plate and ice and the research of ship-ice collision structure response.The major work of this paper is as follows:Research on physical and mechanical properties of non-refrigerated model ice.Firstly,through the study of physical and mechanical properties of polar sea ice,the physical and mechanical properties of non-refrigerated model ice under a certain scale are determined.Then,the model ice with multiple proportions was made,and its density,bending strength,modulus of elasticity and compressive strength were tested.At last,a kind of model ice with a proportion a certain proportion whose physical and mechanical characters are in accordance with the physical and mechanical properties of the non-refrigerated model ice under a certain scale is found.And the proportion is used as the ratio of the model ice in the subsequent test.Experimental study and numerical simulation of collision between hull plate frame and non-refrigerated model ice.Firstly,according to the principle of similarity,the hull frame of a polar ship is scaled according to the scale factor of non-refrigerated model ice.Then,according to the collected data and summary,the size of the model ice,the collision position and collision speed of the hull plate frame-model ice are determined,and the model of the collision between the hull plate frame and the model ice is carried out.And the structural damage,deformation,stress and collision force of the hull grillage are measured,and the influence of different collision positions on the results of ship ice collision is summarized.Then,the same numerical model of hull plate frame and model ice as the model test is established,and the numerical simulation calculation is carried out.The results of the model test and the numerical simulation results are compared in order to prove the accuracy of the numerical simulation method of the ship-ice collision,so as to lay a foundation for the collision simulation research of the bow and the model ice.Research on the numerical simulation of ship’s bow-ice collision.Taking the polar ship bow as the calculation object,combined with the nonlinear finite element numerical simulation software LS-DYNA,the structural response of the collision between the bow and the polar sea ice and the structural response of the collision between the bow of the scale model and the non-refrigerated model ice are studied,and the results are compared.Then the relationship between damage deformation,the maximum stress value of bow and collision force of scale model bow and real bow in collision process is analyzed.Furthermore,the rationality of the comparison between model bow and real bow with scale ratio of 1:5 is verified.