Vibration of Ship Hulls Due to Wave Excitation.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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This thesis presents a computer program designed to estimate the first seven natural frequencies and their respective modes for ships and to estimate ship response in a Pierson-Moskowitz sea. The program was designed to function on a minimum of input. Hull offsets and deck edge height for each station are the major data required. The program computes the hydrodynamic added mass, the polar moment of inertia J, the second moment of area I, the effective shear stiffness KAG and the ship mass for each station. A Prohl sequence is used to determine hull natural frequencies and mode shape. A wave forcing function is presented which sums buoyancy, added mass and damping factors due to wave passage. The program can be used for all vessels, but program development was based on a single beam model so superstructure effects are not considered. A minimum of 20 stations is required. Author
- Marine Engineering
- Fluid Mechanics