With the continuous development of Arctic resources, the risk of collision between polar ships and level ice is increasing. Different icebreaking methods will have different effects on the hull structure under variable ice thickness. At present, the judgment of icebreaking methods is mainly based on the icebreaking levels in polar ship specifications. It is difficult to study the maximum icebreaking thickness and the speed of different icebreaking methods without classifying the icebreaking levels. The equation between the propulsion force and speed is therefore derived based on the force balance relationship. A method for judging the icebreaking method of polar ships is proposed by combining with the safety design of hull structure strength. The maximum cruising ability of the continuous icebreaking for a polar icebreaking transport ship has been determined. The reliability of the determination of the icebreaking method is verified by comparing with the model experimental results. The speed range for continuous icebreaking and impact icebreaking methods has been divided under different ice thickness conditions. It provides theoretical support for the icebreaking design and navigation of polar ships.

Corrosion and biofouling impose serious hazards to the normal operation of marine propellers. The current research on the protection methods for marine propellers focuses on the propeller material itself, with insufficient attention to the propeller protective coating technology. This study introduces the anti-fouling principle of low surface energy fouling-release coatings and the development of relevant technologies, discusses the prospects and development directions of organosilicon-modified low surface energy anti-fouling coatings applied to marine propellers, and looks to the future development of anti-fouling coatings for marine propellers.

Long-span structure is one of the typical structure features of ships. Low rigidity of the long-span structure causes large structure displacement and vibration amplitude, imposing difficulties in the vibration reduction design. The vibration of the long-span grillage structure is analyzed for a ship under bow thruster excitation in the current study. Topology optimization base structure is then established for the arrangement of the pillar under the long-span grillage structure. With the objective function of lightest structure weight based on SIMP method, the dynamic topology optimization design is carried out by using the stand pillar arrangement topology optimization model considering the vibration velocities of specified nodes as the constrain. The results show that a pillar arrangement plan with good vibration control performance is obtained by using the long-span pillar topology optimization method in the current study. This method can reduce the complexity of the design and the workload of the dynamic calculation, with a better vibration damping effect.