A ship manoeuvring problem is solved using an algorithm built on fuzzy logic.The manoeuvring model for a design ship is coded in C++and the results are presented here.A bulk carrier is assumed as design ship for a new...A ship manoeuvring problem is solved using an algorithm built on fuzzy logic.The manoeuvring model for a design ship is coded in C++and the results are presented here.A bulk carrier is assumed as design ship for a newly setting up harbor along the east coast of India.The harbor mouth is 25 km away from the deep water zone.The approach channel is straight along the 22 km length.Laterally restricted and shallow waters are considered and their influences on hydrodynamic derivatives are discussed.Some sample problems are solved.Trajectories,ship heading,rudder angle,velocities and accelerations,of the moving vessel,are calculated and presented for clarity.The developed code is robust in the sense that any designer or user can easily interact with various input parameters to verify the outputs and their suitability for the design ship meant for a particular water front location.The results are validated using another algorithm built on PID which is discussed in brief.展开更多
Tropical waters are with more salinity and harbor millions of micro organisms.Such environmental condition challenges the strength and reliability of marine structures.The behaviour of structural materials due to pitt...Tropical waters are with more salinity and harbor millions of micro organisms.Such environmental condition challenges the strength and reliability of marine structures.The behaviour of structural materials due to pitting and uniform corrosion is studied,and a method based on coating is suggested to improve the life cycle ensuring reliability in its functionality.The structural materials like high strength steel and AA6063 were selected for the study and metallic coating performed for evaluation of corrosion resistances.Samples are investigated in chloride concentration of 3.5%NaCl by weight loss measurements and potentiodynamic polarization.The coating was done by electroplating and PVD(Physical Vapour Deposition)method for high strength steel,where as aluminum samples were coated by an electroplating method.The high strength steel samples were mono coated by Ni and Cr using the electroplating method,and composite coating was done with Al-N(Aluminium nitride)and Ti-Al-N(Titanium Aluminium Nitride)by PVD techniques.Scanning electron microscopy(SEM)was used for evaluation of fracture toughness of coating around the pits formed.The investigation showed that the methods and thickness of coating influenced corrosion resistances of the substrate metals.Composite coated samples by PVD showed excellent corrosion resistance properties compared to electroplated samples after the investigations.Finite element analysis was performed by FRANC 2D/L(Fracture Analysis Code)showed a decrease in stress intensity values for composite coated samples of PVD compared to mono coated electroplated samples.Increase in the duty cycle of the structure was observed in the simulation has a result of a decrease in stress intensity values for PVD coated samples.展开更多
文摘A ship manoeuvring problem is solved using an algorithm built on fuzzy logic.The manoeuvring model for a design ship is coded in C++and the results are presented here.A bulk carrier is assumed as design ship for a newly setting up harbor along the east coast of India.The harbor mouth is 25 km away from the deep water zone.The approach channel is straight along the 22 km length.Laterally restricted and shallow waters are considered and their influences on hydrodynamic derivatives are discussed.Some sample problems are solved.Trajectories,ship heading,rudder angle,velocities and accelerations,of the moving vessel,are calculated and presented for clarity.The developed code is robust in the sense that any designer or user can easily interact with various input parameters to verify the outputs and their suitability for the design ship meant for a particular water front location.The results are validated using another algorithm built on PID which is discussed in brief.
文摘Tropical waters are with more salinity and harbor millions of micro organisms.Such environmental condition challenges the strength and reliability of marine structures.The behaviour of structural materials due to pitting and uniform corrosion is studied,and a method based on coating is suggested to improve the life cycle ensuring reliability in its functionality.The structural materials like high strength steel and AA6063 were selected for the study and metallic coating performed for evaluation of corrosion resistances.Samples are investigated in chloride concentration of 3.5%NaCl by weight loss measurements and potentiodynamic polarization.The coating was done by electroplating and PVD(Physical Vapour Deposition)method for high strength steel,where as aluminum samples were coated by an electroplating method.The high strength steel samples were mono coated by Ni and Cr using the electroplating method,and composite coating was done with Al-N(Aluminium nitride)and Ti-Al-N(Titanium Aluminium Nitride)by PVD techniques.Scanning electron microscopy(SEM)was used for evaluation of fracture toughness of coating around the pits formed.The investigation showed that the methods and thickness of coating influenced corrosion resistances of the substrate metals.Composite coated samples by PVD showed excellent corrosion resistance properties compared to electroplated samples after the investigations.Finite element analysis was performed by FRANC 2D/L(Fracture Analysis Code)showed a decrease in stress intensity values for composite coated samples of PVD compared to mono coated electroplated samples.Increase in the duty cycle of the structure was observed in the simulation has a result of a decrease in stress intensity values for PVD coated samples.
