SHIP RESISTANCE IN UNIFORM WAVES
Several ship models (Series 60: C sub B = 0.60, 0.70, 0.80; and DE 1006) have been tested in uniform waves. Motions as well as resistances were measured in more than 2,500 individual tests. The ratios of wave length to ship length of 0.75, 1.00, 1.25, and 1.50 were covered. The wave steepness was varied between 1:15 and 1:70 for each of the wave lengths. The speed range for testing was between Froude numbers of 0 and 0.35. Still water resistance due to the oncoming waves derived by subtracting the still-water resistance from the total resistance in waves. The transfer functions (response functions) necessary to predict the added resistance in irregular waves were calculated from the experimental results for the four models. Heaving, pitching, and surging were measured and the bow submergence and emergence estimated for each case. The results, however, are not given in this report. The results indicate that the added resistance depends upon the block coefficient, the speed of the ship, and the steepness of the waves. It has a maximum in the vicinity of the maximum motions and decreases again for the higher speeds. The added resistance reaches higher values per unit displacement for smaller block coefficients.
- The research was carried out under the Bureau of Ships, Fundamental Hydromechanics Research Program, Project S-R009 01 01, administered by the David Taylor Model Basin.
University of California, BerkeleyInstitute of Engineering Research
Bekeley, CA United States 94720
- Sibul, O J
- Publication Date: 1964-1
- Features: References;
- Pagination: 51 p.
- TRT Terms: Ship motion; Wave height; Wave resistance; Waves
- Old TRIS Terms: Model testing; Regular waves
- Subject Areas: Design; Marine Transportation;
- Accession Number: 00043740
- Record Type: Publication
- Source Agency: Ship Structure Committee
- Report/Paper Numbers: NA-64-1
- Contract Numbers: Nonr-222(18)
- Files: TRIS
- Created Date: May 4 1973 12:00AM