Analysis of shadowing effect of propeller-ice milling conditions with peridynamics

Abstract

During research on the propeller−ice contact process, it was found that there is a shadowing effect that has a significant influence on the propeller loading. The shadowing effect was observed to occur with both staggered configurations of multi-propellers along with the separate blades of single propellers. The shadowing effect causes the load from the ice to decrease on the aft propellers or a following blade compared to the blade currently in contact with the ice. Two numerical simulation models based on the peridynamics method have been established in order to study shadowing effect for both forward and aft multi propeller-ice configurations as well as individual blades of a single propeller. The influence mechanism of the shadowing effect on the sea ice failure mode along with the loads acting on the propellers are examined in this paper. Additionally, a new analytical shadowing effect coefficient on the ratio of the front and back contacts divided by the axial length of the damaged ice is put forward based. The results show that the shadowing effects are well modeled by both peridynamic numerical simulations and the analytical shadowing coefficient.