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Friday, March 27, 2015

SHIP DESIGN




GENERAL

The process of ship design has an iterative nature that is most commonly described by a design spiral that reflects the design methodology and strategy.
The ship design process starts with deciding the mission requirements. At the early stages of the design determines the parameters that will form the basis for optimum ship dimensions, hull form development as well as propulsion system selection and auxiliary systems.




These are usually specified by the ship owner, who based on the current and future market scenario and expectations according to the customer's requirements.
  • Owners requirements
  • Problem Definition
  • Conceptual Design
  • Initial G.A.
  • Sketches and 3D Rendering
  • Preliminary Specification
Along with the cycle the process goes through various phases:
  • Concept design phase (The key objective is arrive at the feasibility of the project )
  • Contract design phase (The key objective is to arrive at the costing of the project )
  • Preliminary design phase (The key objective is to plan the project )
  • Detailed design phase (The key objective is to construct the vessel )

BASIC DESIGN CONSIDERATIONS

 The procedures and ideas described for ship design can be applied immediately to the ship system. Two basic design considerations form regarding of ship design process:
                Operation Employment
                Mission: task or job ship is designed to perform
                Armament: measure of offensive & defensive power of ship
                Protection: features designed to thwart or minimize destructiveness of enemy attack
                Maneuverability: rapid course/speed changes
                Cruising range: distance a ship can travel at cruising speed without refuel / reprovision
                Structural design & seaworthiness
                Stability: ability of ship to return to an upright position when heeled over
                Displacement: measured in tons of water
                Freeboard: vertical distance between top of hull and water line
                Hull shape
                Beam