Abstract
The effects of hull roughness on ship maneuvering characteristics are investigated. The hydrodynamic derivatives in the equations of motion for surface vessel maneuvering are modified to incorporate roughness of the hull and rudder. Vessel lifetime roughness profiles are postulated based on construction, coatings, operation, and maintenance for a vessel life of 25 years. These are then applied to the turning maneuver for single screw cargo ships with block coefficients from .60 to .80. The implications for naval missions are discussed. Introduction The effects of hull roughness, including fouling, are known to affect the performance of a vessel, especially as measured in additional fuel consumption and less so, the number of voyages in a lifetime. Today, there is significant attention given to hull surface cleaning, coating, and propeller polishing to address these issues. In addition and even less known are the effects on the maneuvering performance of a vessel. For naval vessels, they may affect the success of the mission. Roughness of the hull can occur because of a number of factors including hull material used and quality of construction, mechanical damage in operation, roughness from paints and coatings and their method of application, damage to the coating during maintenance, corrosion and pitting of the hull structure material, and biofouling influenced by the type of antifouling paint or coating and method of application. The roughness never ceases to increase during the vessel’s life. Starting with the hull material and construction, then the effects of different paints and coatings, operations, dry-docking intervals, and approach to maintenance, it is possible to develop a lifetime roughness profile.
Published Version
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