High-Speed Ship Maneuverability
In this paper, the effects of changes in hull attitude and the presence of stern appendages such as rudders, shaft brackets, bossing, and propeller shafts on the maneuverability of a high-speed ship are investigated. The study is conducted for a ship operating within a Froude number range of 0.6‐1.0. To determine the effect of attitude changes on the hydrodynamic derivatives during maneuvering, the hydrodynamic forces acting on the ship model with/without stern appendages are measured in three conditions: an even keel with the designed draft, and the same setup including hull rise or trim. For each condition, measurements are conducted for oblique motion, steady turning, and straight motion with heel, for various ship speeds. The hydrodynamic derivatives excluding the attitude change are obtained from the measured results, along with the changes in these derivatives due to hull rise and trim. Using the hydrodynamic derivatives, the maneuverability indexes are calculated. Hence, the following results are obtained: By inclusion of the ship attitude change, the linear derivative of lateral force with respect to the sway velocity
becomes less negative, the linear derivative of yaw moment with respect to the yaw rate becomes more negative slightly, and the difference between
and added mass in the x direction , along with , becomes significantly large in the positive direction. Primarily by the contribution of ,
and , inclusion of the attitude change improves the course stability. A bare-hull ship becomes unstable as regards course keeping, although a ship with stern appendages is stable. Thus, the addition of stern appendages has a significant
effect on the course stability, which is primarily due to the increase in the negative direction of , and , caused by their presence.
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Document Type: Research Article
Publication date: 2016-12-01
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- The Journal of Ship Research is a quarterly publication providing highly technical papers on applied research in hydrodynamics, propulsion, ship motions, structures, and vibrations. While the Journal requires that papers present the results of research that advances ship and ocean science and engineering, most contributions bear directly on other disciplines, such as civil and mechanical engineering, applied mathematics, and numerical analysis. High quality papers are contributed from the U.S., Canada and overseas, with representation from established authorities as well as new researchers.
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