Optimum Vessel Performance in Evolving Nonlinear Wave Fields
Final rept. 1 Apr 2005-31 Aug 2012
MICHIGAN UNIV ANN ARBOR DEPT OF NAVAL ARCHITECTURE AND MARINE ENGINEERING
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This report summarizes the research conducted under the MURI entitled Optimal Vessel Maneuvering in Evolving Nonlinear Wave Fields. A radar system was developed to measure the wave field around the ship. A nonlinear pseudo-spectral wave model that accounts for wave-wave interactions, wave-current interactions, wave breaking and wind-wave effects has been developed to forecast in time and space the evolving waves around the ship. The radar wave field predictions that initialize the wave field model are improved using assimilation techniques. Two techniques were developed to compute the responses of the ship to the predicted wave field A body-exact strip theory and a FFT accelerated boundary element method. The optimal path through the wave field that minimizes ship motions and travel time is found using a new dynamic programing model. Various control algorithms were investigated to allow the ship to follow the optimum path.
- Physical and Dynamic Oceanography
- Marine Engineering
- Active and Passive Radar Detection and Equipment