RESULTS FROM FULL-SCALE MEASUREMENTS OF MIDSHIP BENDING STRESSES ON TWO C4-S-B5 DRYCARGO SHIPS OPERATING IN NORTH ATLANTIC SERVICE.
Progress rept. no. 4,
LESSELLS AND ASSOCIATES INC WALTHAM MASS
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Records of wave-induced midship bending stresses were obtained on magnetic tape during the past three years using an unmanned instrumentation system. The reduced data cover thirty-four round trip voyages of two instrumented C4-S-B5 machinery aft dry-cargo vessels on the North Atlantic trade route. The data represent about 12,000 hours at sea out of five ship-years of operation. Each data point is based on a one-half hour record representing four hours of ship operation. An automatic Probability Analyzer is used in the reduction of data. All available data are presented as plots of rms stress variation and maximum peak-to-peak stress variation vs. sea state Beaufort Wind Scale. The data were shown to be representative of a class of ships exposed to sea states corresponding to Beaufort Numbers 3-7. Author