Linear theory asumes a steady metacentric height but when a ship is moving through waves this height is a dynamic quantity not a static one. As the wave surface moves along the length of the ship the shape of the underwater form changes, particularly at the bow and stern, an effect accentuated by heave and pitching motions.
What is Dynamic stability and Static stability? 9. Explain stable equilibrium, neutral equilibrium and unstable equilibrium. 10. Explain angle of loll. 11. ROR and Ship Stability etc. Searchable index include more than 2000 nautical topics in expected MMD written and oral exams with pinpoint answer, making our site a good all around tool
The dynamic stability of ships encountering large regular waves from astern is analyzed, with focus on delineating the specific conditions leading to the uncontrolled turn identified as broaching. The problem's formulation takes into account motions of the actively steered or controls-fixed vessel in surge-sway-yawroll with consideration of Froude-Krylov and diffraction wave excitation.
2 Ship Stability 2.1 Basic Stability Calculation The ability of a ship to return to its equilibrium position after it is displaced there from because of the external forces and external torques M H is called ship stability. Ship heels under the action of static stability, which supposes the angular velocity is zero. • Dynamic stability describes the form of motion an aircraft in static stability undergoes when it tries to return to its original position. such as an aircraft, rocket, or ship, that causes it, when disturbed from an original state of steady motion in an upright position, to damp the oscillations set up by restoring moments and gradually IMO Regulations for Intact Stability. Area A ≥ 0.055 (m rad) Area A + B ≥ 0.09 (m rad) The work and energy considerations. Area B ≥ 0.030 (m rad) (dynamic stability) GZ ≥ 0.20 (m) at an angle of heel equal to or greater than 30 . GZmax should occur at an angle of heel preferably exceeding 30 but not less than 25 . .
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    • what is dynamic stability of ship