Two codes have been developed to predict maneuvering in a seaway. The first uses a quasi-steady analysis with Fourier decomposition to determine the ship responses and find the optimum path for minimum motions. The second extends the existing body-exact strip theory (UMBEST) to arbitrary paths. Several different controllers, including a model predictive controller with constraint enforcement capability and a back-stepping nonlinear controller with desired stability margins, have been developed that will enable safe and effective ship maneuvering in a seaway while satisfying seakeeping constraints.
Maneuvering in a Seaway
2011
17 pages
Report
No indication
English
Algebra, Analysis, Geometry, & Mathematical Logic , Statistical Analysis , Marine Engineering , Navigation Systems , Fluid Mechanics , Maneuvers , Time domain , Seakeeping , Optimization , Control systems , Predictions , Paths , Diffraction , Hydrostatics , Euler equations , Runge kutta method , Ships , Position(Location) , Control surfaces , Velocity , Line of sight , Umbest(University of michigan body-exact strip theory) , Mpc(Model predictive control) , Adams-bashforth method , Body-exact code , Body-exact computations , Boundary condition , Controllers , Deflections , Dynamic surface control , Dynamic wave pressure , Far field radiation , Froude-krylov exciting pressures , Incident waves , Linear potential waves , Maneuvering , Nonlinear ship motions , Path following , Seaways , Ship control , Ship maneuvering , Six degrees of freedom , Strip theory code , Wheeler stretching , Laplace equations , Nonlinear seakeeping codes
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