Static Analysis Of Propeller Under Ice Loads And Dynamic Response Of The Collision Between Ice And Blade

Every year in winter, a large number of sea ice appear over the Bohai Sea and the northern Huanghai Sea. Exposed at the stern and immersed in water shallower, ship propeller is one of the weakest part. It is difficult to avoid the occurrence of ice-propeller interaction, which causes the blade tip and leaf margin serious damaged. Thus, the investigation of the ship propeller strength problem under the action of ice is valuable for the structure design of the ice propeller in engineering and applications aspects.In this paper, the propeller strength under the ice loads and the dynamic response of ice-blade collision are analyzed. Based on the formulas of ice loads and calculation cases in the rules of China Classification Society(CCS), the static analysis of propeller established in Pro/E is realized by ANSYS, which provides a method support for the structure strength and design of propeller under ice loads.Based on a literature, the process of high speed impact of ice is simulated, in which SPH method is used in ice model. The feasibility of the numerical model of ice and collision calculation method is verified effectively. Then ice-blade collision models are established and simulated by ANSYS/LS-DYNA. Dynamic structural responses of single ice-blade collision at different angels, different speeds, different positions, different radii of ice and multiple ice-blade collision are focused in this study. Deformation of blade, element maximum stress and strain, impact force during the collision process in the above cases are carried out. Thus the influence rules of the above factors on ice-blade collision are obtained qualitatively.B1ice class strengthen propeller is designed according to CCS rules. With the same methods above, the influence of blade thickness on the ability of propeller bearing ice loads and ice impact is mainly researched. Results show that the increase of blade thickness has made great contribution to improving the bearing capacity of propeller.The results of this study are of vital importance for the structure design and strength check of propeller, which provide a useful reference for the anti-ice structure design of propeller.