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E.c. Tupper - One of the best experts on this subject based on the ideXlab platform.

  • Stability at large angles
    Introduction to Naval Architecture, 2004
    Co-Authors: E.c. Tupper
    Abstract:

    This chapter discusses the methods for assessing the stability of ship at large angles of inclination. The standards for stability are also discussed. There are a number of features of the statistical stability ( GZ) curve, which are useful in describing a ship's stability. The slope of the curve at the origin is a measure of the initial stability GM. The maximum ordinate of the curve multiplied by the displacement equals the largest steady heeling moment the ship can sustain without capsizing. Its value and the angle at which it occurs are both important. The value at which GZ becomes zero or disappears, is the largest angle from which a ship will return once any disturbing moment is removed. This angle is called the angle of vanishing stability. The range of angle over which GZ is positive is termed the range of stability. Important factors in determining the range of stability are freeboard and Reserve of Buoyancy. To calculate the damaged waterline, successive approximation is needed. There are two approaches: the lost Buoyancy and the added weight methods. These give different GM values but the same righting moment.

Louis J. Rydill - One of the best experts on this subject based on the ideXlab platform.

  • Concepts in Submarine Design: Hydrostatic conditions of flotation
    Concepts in Submarine Design, 1994
    Co-Authors: Roy Burcher, Louis J. Rydill
    Abstract:

    For a vessel floating on the surface, the hydrostatic properties of relevance are the conditions of flotation and the stability of the vessel in relation to disturbances from the static flotation condition. It is assumed that the water surface is calm and any movement of the craft is sufficiently slow for any dynamic effects to be discounted. Accepting Archimedes principle that a vessel will displace its own weight of water, the initial requirement for flotation is that the intact hull is of sufficient volume to displace its own weight whilst having a reasonable freeboard (height of weather deck above the waterline) and that it floats upright. The volume of watertight hull above the waterline constitutes a Reserve of Buoyancy (ROB). This ROB becomes important when considering the safety of the vessel in damaged conditions when water floods part of the hitherto intact displacement volume below the waterline. The stability of the vessel concerns the outcome of perturbations from the static flotation condition. Sideways motion (sway), change of heading (yaw) and fore or aft motion (surge) do not change the static conditions of the hull and can be considered as neutral. Whereas roll motion (heel), pitching and vertical motion (heave) result in changes in the distribution of buoyant volume and hence variation in the static equilibrium condition. The question to be answered is whether after a disturbance the vessel returns to its initial equilibrium state. If a vessel heaves upwards then the displacement volume reduces and the excess of unchanged weight over reduced Buoyancy provides a force in a direction restoring the vessel to its original position.

Roy Burcher - One of the best experts on this subject based on the ideXlab platform.

  • Concepts in Submarine Design: Hydrostatic conditions of flotation
    Concepts in Submarine Design, 1994
    Co-Authors: Roy Burcher, Louis J. Rydill
    Abstract:

    For a vessel floating on the surface, the hydrostatic properties of relevance are the conditions of flotation and the stability of the vessel in relation to disturbances from the static flotation condition. It is assumed that the water surface is calm and any movement of the craft is sufficiently slow for any dynamic effects to be discounted. Accepting Archimedes principle that a vessel will displace its own weight of water, the initial requirement for flotation is that the intact hull is of sufficient volume to displace its own weight whilst having a reasonable freeboard (height of weather deck above the waterline) and that it floats upright. The volume of watertight hull above the waterline constitutes a Reserve of Buoyancy (ROB). This ROB becomes important when considering the safety of the vessel in damaged conditions when water floods part of the hitherto intact displacement volume below the waterline. The stability of the vessel concerns the outcome of perturbations from the static flotation condition. Sideways motion (sway), change of heading (yaw) and fore or aft motion (surge) do not change the static conditions of the hull and can be considered as neutral. Whereas roll motion (heel), pitching and vertical motion (heave) result in changes in the distribution of buoyant volume and hence variation in the static equilibrium condition. The question to be answered is whether after a disturbance the vessel returns to its initial equilibrium state. If a vessel heaves upwards then the displacement volume reduces and the excess of unchanged weight over reduced Buoyancy provides a force in a direction restoring the vessel to its original position.