2021, Volume 16, Issue 5
As a non-local theory, peridynamics can spontaneously simulate material failure and damage through bond failure. It has achieved preliminary research results in the ocean engineering sector, especially in the field of ships and marine structures in ice zones. In order to better understand the application of peridynamics to ships and marine structures in such environments, this paper presents relevant applications including the ice constitutive model, ice-structure interaction model, ice-water coupling method, structural mechanics model, application of icebreaking through underwater explosion, application of structure surface deicing, etc. Finally, an attempt is made to comprehensively review the existing published research, analyze its characteristics and challenges, and provide corresponding solutions and future research directions.
The marine navigation system is a precondition for all kinds of military and civilian marine vehicles to sail safely to and within the polar regions. However, the special polar environment reduces the performance of such systems, sometimes to the point at which they cannot even be applied. In order to fundamentally understand the application of marine navigation systems in polar regions, this paper systematically expounds upon the development history of such systems, and comprehensively analyzes the impact of the special polar environment in four aspects: Earth kinematics, geophysical field, marine environment and geographic environment. As such, this survey provides valuable references by exploring the research context and future development of marine navigation technology, and analyzing the research status and future trends of the deployment of marine navigation systems in polar regions.
The physical and mechanical properties of sea ice and the failure modes of ice sheets significantly affect the ice loading of offshore structures. This paper first introduces the physical and mechanical characteristics of sea ice, then describes the physical processes of the interaction of ice sheets with offshore structures. Finally, the progress of research on the ice loading of offshore structures is briefly analyzed, including the three main approaches of formula estimation, experimental testing and numerical simulation. By discussing the applicability of formula estimation, the research focus and difficulties of experimental testing, and the development trends of numerical simulation, we find that the model testing of ice loading is an effective method. This paper covers the research trends and problems faced by ice loading on offshore structures, and it can provide certain guiding references for the related research of scholars in the field.
The advantages of hybrid ships in energy conservation and emission reduction are increasingly prominent in the context of countries around the world paying increasing attention to such matters. Energy management is the key to achieving energy conservation and emission reduction on the premise of ensuring power performance. This paper summarizes the research progress and status of hybrid ship energy management. First, the energy management objectives are summarized in the three aspects of reliability objectives, economy objectives and environmental protection objectives. Second, the energy management strategies are compared and analyzed from the perspectives of rules and optimization, and the advantages, disadvantages and application conditions of the existing energy management strategies are summarized and analyzed deeply and comprehensively. Finally, according to the gaps in the existing research, the future research directions of hybrid ship energy management are predicted.