The United States Navy has taken a new interest in tumblehome hulls. While the stealth characteristics of these hull forms make them attractive to the Navy, their sea keeping characteristics have proven to be problematic. Normal approximations of sea keeping characteristics using linear differential equations with constant coefficients predict a very stable platform, while observations in model tests show a ship that is prone to extreme roll transients. This thesis examines a simple method of producing a non-linear simulation of roll motion using a tumblehome hull provided by the Office of Naval Research. This research demonstrates the significant difference that a variable restoring coefficient introduces into a hull's seakeeping characteristics.
Non-Linear Rolling of Ships in Large Sea Waves
2007
67 pages
Report
No indication
English
Algebra, Analysis, Geometry, & Mathematical Logic , Marine Engineering , Dynamic Oceanography , Hulls(Marine) , Seakeeping , Ocean waves , Linear differential equations , Theses , Model tests , Approximation(Mathematics) , Coefficients , Stabilized platforms , Ships , Roll , Transients , Simulation , Ship motion , Tumblehome hulls , Roll transients , Non-linear simulation , Roll motion
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