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REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



I. REPORT NUMBER 



DTNSRDC-82/036 



2. GOVT ACCESSION NO. 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Subtitle) 



PREDICTED MOTIONS OF HIGH-SPEED SWATH SHIPS 

 IN HEAD AND FOLLOWING SEAS 



5. TYPE OF REPORT & PERIOD COVERED 



Final 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORCj) 



Young S . Hong 



8. CONTRACT OR GRANT NUMBER'S.) 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



David W. Taylor Naval Ship Research 

 and Development Center 

 Bethesda, Maryland 20084 



(See reverse side) 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Naval Sea Systems Command 

 Washington, D.C. 20362 



12. REPORT DATE 



July 1982 



13. NUMBER OF PAGES 



52 



14. MONITORING AGENCY NAME ft ADDRESS'// different from Controlling Office) 



IS. SECURITY CLASS, (of this report) 



UNCLASSIFIED 



16. DISTRIBUTION ST ATEMEN T (of this Report) 



APPROVED FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED 



17. DISTRIBUTION STATEMENT (of the abstract entered In Block 20, If different from Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue on reverse aide If necessary and Identity by block number) 



Small-Waterplane-Area Twin-Hull (SWATH) Ship_ Unified Slender-Body Theory 

 Heave Motion, Pitch Motion Strip Theory 



Following Seas 

 Head Seas 

 High Speed 



20 ABSTRACT (Continue on reverse side It necessary and Identity by block number) 



Unified slender-body theory has been applied to predicting the motion 

 of small-waterplane-area twin-hull high-speed (SWATH) ships in head seas. 

 Using this theory, numerical results indicate an improvement in accurately 

 predicting the effects of added-mass and damping coefficients when com- 

 pared with strip theory. However, the same improvement is not achieved 

 in predicting the effects of exciting forces and motions. Corrections in 



(Continued on reverse side) 



EDITION OF 1 NOV 65 IS OBSOLETE 

 S/N 01 02-LF-01 4-6601 



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