The NTIS website and supporting ordering systems are undergoing a major upgrade from 8PM on September 25th through approximately October 6. During that time, much of the functionality, including subscription and product ordering, shipping, etc., will not be available. You may call NTIS at 1-800-553-6847 or (703) 605-6000 to place an order but you should expect delayed shipment. Please do NOT include credit card numbers in any email you might send NTIS.
Documents in the NTIS Technical Reports collection are the results of federally funded research. They are directly submitted to or collected by NTIS from Federal agencies for permanent accessibility to industry, academia and the public.  Before purchasing from NTIS, you may want to check for free access from (1) the issuing organization's website; (2) the U.S. Government Printing Office's Federal Digital System website; (3) the federal government Internet portal; or (4) a web search conducted using a commercial search engine such as
Accession Number ADA571589
Title Optimum Vessel Performance in Evolving Nonlinear Wave Fields.
Publication Date Nov 2012
Media Count 38p
Personal Author R. F. Beck
Abstract 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.
Keywords Maneuvers
Mathematical prediction
Nonlinear systems
Ocean surface
Ocean waves
Optimal path
Radar wave measurements
Ship maneuvering and control
Ship motion
Wave field evolution

Source Agency Non Paid ADAS
NTIS Subject Category 47C - Physical & Chemical Oceanography
47A - Marine Engineering
63H - Radiofrequency Detection
Corporate Author Michigan Univ., Ann Arbor. Dept. of Naval Architecture and Marine Engineering.
Document Type Technical report
Title Note Final rept. 1 Apr 2005-31 Aug 2012.
NTIS Issue Number 1316
Contract Number N00014-05-1-0537

Science and Technology Highlights

See a sampling of the latest scientific, technical and engineering information from NTIS in the NTIS Technical Reports Newsletter

Acrobat Reader Mobile    Acrobat Reader