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Two-Staged Method for ice channel Identification Based on Image Segmentation and Corner Point Regression

China Ocean Engineering 2024年第2期38卷 313-325页

作者： DONG Wen-bo ZHOU Li DING Shi-feng WANG Ai-ming CAI Jin-yan School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Identification of the ice channel is the basic technology for developing intelligent ships in ice-covered waters,which is important to ensure the safety and economy of *** the Arctic,merchant ships with low ice class often navigate in channels opened up by *** in the ice channel often depends on good maneuverability skills and abundant experience from the captain to a large *** ship may get stuck if steered into ice fields off the *** this circumstance,it is very important to study how to identify the boundary lines of ice channels with a reliable *** this paper,a two-staged ice channel identification method is developed based on image segmentation and corner point *** first stage employs the image segmentation method to extract channel *** the second stage,an intelligent corner regression network is proposed to extract the channel boundary lines from the channel region.A non-intelligent angle-based filtering and clustering method is proposed and compared with corner point regression *** training and evaluation of the segmentation method and corner regression network are carried out on the synthetic and real ice channel *** evaluation results show that the accuracy of the method using the corner point regression network in the second stage is achieved as high as 73.33%on the synthetic ice channel dataset and 70.66%on the real ice channel dataset,and the processing speed can reach up to 14.58frames per second.

关键词： ice channel ship navigation identification image segmentation corner point regression

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Parameterization of the propeller thrust for modelling ship braking in ice channel behind icebreaker

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Transportation Safety and Environment 2023年第1期5卷 41-48页

作者： Vadim K.Goncharov Natalia Yu.Klementieva Saint-Petersburg State Marine Technical University Saint-Petersburg190121Russia Krylov State Research Centre Ice Basin LaboratorySaint-Petersburg196158Russia.

Cargo ship sailing within the ice channel that an assisting icebreaker tracks in the compact ice cover is the usual navigation practice for difficult ice conditions in freezing seas and Arcticwater *** the icebreaker or an ahead vessel stops before the insuperable ice obstacle or because of engine trouble,the danger of an emergency appears,namely of collision with the icebreaker or the ahead ship,if the interval between them is not sufficient for effective braking and *** paper presents the equation that describes the ship braking process within an ice channel and includes the thrust of the propeller that works under the reverse *** specific of this regime is the following:the ship continues the motion‘forwards’and the propeller rotates‘backwards’.An analytical method for description of the ship propeller work on the reverse regime is absent because of the detached flow on its *** paper describes the developed empirical method of this regime parameterization on the basis of serial models of propeller *** outcomes of this investigation are applied to a ship braking process simulation and the evaluation of the safe interval between the ship and the icebreaker.

关键词： ship braking ice channel propeller action curve advance thrust reverse regime

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Problem statement on the vessel braking within ice channel

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Transportation Safety and Environment 2021年第1期3卷 50-56页

作者： Vadim K.Goncharov Natalia Yu.Klementieva Saint-Petersburg State Marine Technical University 3Lotsmanskaya str.Saint Petersburg190121Russia Krylov State Research Centre 44Moskovskoe shosseSaint Petersburg196158Russia

Sailing within the ice channel that assisting icebreaker tracks is usual for difficult ice conditions in the Northern freezing seas and the Arctic *** is the danger of emergency,namely,the collision with an icebreaker or the ahead vessel,when ones stop before insuperable ice obstacle or because the engine *** paper contents analysis of the vessel braking process and formulation of the equation that gives possibility modelling this process and evaluating the distance that is necessary for safe stopping of vessel in dependence on its characteristics and ice *** of investigation will be applicable for the caravan of cargo vessels forming while the icebreaker assistance.

关键词： cargo vessel ice navigation icebreaker assistance ice channel collision braking

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Interaction of Ships within Navigable ice channel

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Journal of Shipping and Ocean Engineering 2014年第1期4卷 1-14页

作者： Vadim K. Goncharov Natalia Yu. Klementieva Kirill E. Sazonov Department of Ocean Technique and Marine Technologies Saint-Petersburg State Marine Technical University Saint-Petersburg190008 Russia Department of Engineering Environmental Protection Saint-Petersburg State Electrotechnical University Saint-Petersburg197376 Russia ice Laboratory Krylov State Research Centre Saint-Petersburg 196158 Russia

At intensive winter navigation, the ships should separate under movement on opposite courses or make overtaking of slowly moving cargo vessels in the water areas covered with ice. Under navigation within ice channel, possibilities for maneuvering are reduced; therefore, danger of collision of ships exists. The ice floes between vessels hulls and outside are the major factors defining values and direction of side force and yawing moment that arise on their hulls during divergence. ice loads on the ship hull exceed considerably the loads caused by water flow around hull. Performed previously experiments in the ice basin have detected that besides increase of side force and yawing moment modules the change of side force directions occurs during the divergence of vessels in comparison with same maneuvering on water area without ice cover. Article contains the detailed problem definition and mathematical model of ships interaction during opposite passing by or overtaking and technical approach to computation of loads on vessels hulls. As example of strategy application, the simulation of loads on overtaking ship was performed, and main results of computations are presented. Outcomes of investigation are character of variation of side force and yawing moment during passage along overtaken ship and dependence of the peak values of additional ice resistance, side force and yawing moment on beam distance between vessels and thickness that are contained in the article.

关键词： Ship ice channel ice concentration navigation overtaking opposing traffic side force yawing moment

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