The research on underwater ship-hull cleaning robot was conducted on the purpose of realizing the automation of cleaning underwater ship hull so that service life of ship will be prolonged and ship speed will raised. ...The research on underwater ship-hull cleaning robot was conducted on the purpose of realizing the automation of cleaning underwater ship hull so that service life of ship will be prolonged and ship speed will raised. Moreover, fuel consumption and the work intensity of divers will be reduced. In this paper, the current situation and the latest technology in China and abroad were analyzed;meanwhile, the typical characteristics of the underwater cleaning robot were introduced. According to the work principle of the underwater cleaning robot, the emphasis was put on the analysis and study of permanent-magnetic absorption, magnetic wheel, airproof and anticorrosion, underwater cleaning equipment and control system. The robot is easy in rotation and simple in control.展开更多
The task of studying the process of icing is important due to the operation of large ships and fishing vessels in the seas of the Arctic Ocean.In this paper the ice accretion simulation for fishing vessel has been don...The task of studying the process of icing is important due to the operation of large ships and fishing vessels in the seas of the Arctic Ocean.In this paper the ice accretion simulation for fishing vessel has been done at different Reynolds and Froude numbers.A hybrid approach was used for modeling:first,the approach based on Reynolds-averaged Navier-Stokes(RANS)model and volume of fluid(VOF)method with interDyMFoam solver was used for ship modelling in waves,second,RANS model and Euler-Lagrangian approach with iceFoam solver for ice accretion process modelling for ship with hull was applied.The k-ωSST turbulence model with wall functions was used for the RANS model.With the help of the interDyMFoam solver,the position of water jet and liquid droplets in space were determined during the movement of the ship and taking into account the waves in the sea.With the help of iceFoam solver,the process of ice accretion on the surface of the vessel was modeled.The calculations were run for different number Reynolds,Froude.The analysis of mesh convergency was done.The distribution of ice thickness and water film on the ship’s surface is obtained.The simulations were performed on a high-performance cluster in parallel mode.展开更多
基金Key Project funded by Department of Science & Technology of Heilongjiang Province (GB03A507)
文摘The research on underwater ship-hull cleaning robot was conducted on the purpose of realizing the automation of cleaning underwater ship hull so that service life of ship will be prolonged and ship speed will raised. Moreover, fuel consumption and the work intensity of divers will be reduced. In this paper, the current situation and the latest technology in China and abroad were analyzed;meanwhile, the typical characteristics of the underwater cleaning robot were introduced. According to the work principle of the underwater cleaning robot, the emphasis was put on the analysis and study of permanent-magnetic absorption, magnetic wheel, airproof and anticorrosion, underwater cleaning equipment and control system. The robot is easy in rotation and simple in control.
基金This work was supported by the Russian Foundation for Basic Research(Grant No.19-29-13016).
文摘The task of studying the process of icing is important due to the operation of large ships and fishing vessels in the seas of the Arctic Ocean.In this paper the ice accretion simulation for fishing vessel has been done at different Reynolds and Froude numbers.A hybrid approach was used for modeling:first,the approach based on Reynolds-averaged Navier-Stokes(RANS)model and volume of fluid(VOF)method with interDyMFoam solver was used for ship modelling in waves,second,RANS model and Euler-Lagrangian approach with iceFoam solver for ice accretion process modelling for ship with hull was applied.The k-ωSST turbulence model with wall functions was used for the RANS model.With the help of the interDyMFoam solver,the position of water jet and liquid droplets in space were determined during the movement of the ship and taking into account the waves in the sea.With the help of iceFoam solver,the process of ice accretion on the surface of the vessel was modeled.The calculations were run for different number Reynolds,Froude.The analysis of mesh convergency was done.The distribution of ice thickness and water film on the ship’s surface is obtained.The simulations were performed on a high-performance cluster in parallel mode.
