PRELIMINARY ANALYSIS OF BENDING-MOMENT DATA FROM SHIPS AT SEA.

• Main Authors: Fritch,D. J., Bailey,F. C., Wise,N. S.
• Other Authors: LESSELLS AND ASSOCIATES INC BOSTON MASS
• Format: Text
• Language: English
• Published: 1963
• Subjects: STRESSES; SHIPS; CARGO SHIPS; DATA PROCESSING; ATLANTIC OCEAN; OCEAN WAVES; PRESSURE; MATHEMATICAL MODELS; STATISTICAL ANALYSIS; MATHEMATICAL PREDICTION; TABLES(DATA); Psi; North Atlantic
• Online Access: http://www.dtic.mil/docs/citations/AD0436877; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0436877

Data playback, manual reduction and analysis techniques, and the automatic system to be used for future analysis are presented. Examples are given of some forms of longterm trends. Useful data were obtained on over 85% of voyages representing three ship-years of operation of a C-4 dry cargo vessel on North Atlantic trade routes. Two complete voyages were analyzed using manual techniques; the results of this analysis are given. The maximum observed peak-to-peak variation of wave-induced stress was 8300 psi which occurred during a Beaufort 11-12 Sea. A prediction based on the limited amount of longterm data available from the two analyzed voyages yielded an extreme value of 10,290 psi for a year of operation of this ship type on North Atlantic route. Stress variations on the order of 9,000 psi were observed during the dry docking of the two instrumented ships. (Author) Report on Ship Response Statistics.