Accession Number : AD0607245

Title :   ESTIMATION OF STABILITY DERIVATIVES AND INDICES OF VARIOUS SHIP FORMS, AND COMPARISON WITH EXPERIMENTAL RESULTS,

Corporate Author : STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB

Personal Author(s) : Jacobs,Winnifred R.

Report Date : SEP 1964

Pagination or Media Count : 132

Abstract : An analytical method for estimating stability derivatives, and hence stability on course, which combines Albring's empirical modifications of simplified flow theory with low aspect-ratio wing theory, is extended to take into consideration the effects on course stability of higher aspect-ratio fins as well. The method, which had been applied in the earlier report to a family of eight hulls of 0.5 block coefficient, is tested further by application to eight Series 60 forms differing in block coefficient as well as in beam, draft, and displacement - with and without rudders; to an extreme vee modification of a Series 60 model; and to three other forms - a Mariner Class model, a destroyer, and a hopper dredge. Comparison with experimental results shows that the values of stability derivatives and indices determined by the analytical method are of the right orders of magnitude and indicate correct trends. Application to a variety of ship forms has demonstrated that the method can predict relative effects of changes in the geometry of a ship form, as well as the effects of changes in skeg and rudder area. (Author)

Descriptors :   (*SHIP HULLS, FLUID DYNAMICS), DIFFERENTIAL EQUATIONS, MANEUVERABILITY, STABILITY, HYDRODYNAMIC CONFIGURATIONS, SHIP MODELS, YAW, SHIP STRUCTURAL COMPONENTS, MATHEMATICAL ANALYSIS, EXPERIMENTAL DATA, ROLL

Distribution Statement : APPROVED FOR PUBLIC RELEASE