Abstract
Recently, the IMO (International Maritime Organization) has reviewed technical issues considering the second generation intact stability criteria in the design stage of ships. In this paper, the evaluation procedure for Lv1 (Level 1) and Lv2 (Level 2) was introduced by focusing on the excessive acceleration mode. Based on real ship data, the calculation process has been explained in detail to make it easy to understand. When the Lv1 criteria considering simple hydrostatic calculations are not satisfied, the computational results of the Lv2 criteria based on mathematical modeling and the hydrodynamics are presented. The relatively low ship roll periods and large changes in the hull shape in the vertical direction make the ships potentially vulnerable to excessive acceleration phenomena. Therefore, the minimum value of height KG that satisfies the stability criteria evaluation in consideration of loading conditions for actually navigating of the ship in the sea should be estimated and operated. In particular, roll damping coefficients using the Ikeda’s method, which are essential for Lv2 vulnerability calculation, were obtained and verified by comparing them with other ship results.
Highlights
The IMO (International Maritime Organization) has recently developed the second generation intact stability criteria for the five stability failure modes to secure the safe navigation of ships [1,2]
The second generation intact stability criteria consist of two steps
For Lv2 criterion, the vessel can be judged to be stable from excessive acceleration mode under the following Equation (4) conditions [12]
Summary
The IMO (International Maritime Organization) has recently developed the second generation intact stability criteria for the five stability failure modes (pure loss of stability, parametric roll, surf-riding/broaching, dead ship condition, and excessive acceleration) to secure the safe navigation of ships [1,2]. The second step (Lv2) is a process of applying a mathematical modelling and evaluating it based on the probabilistic calculations in wave conditions. Calculation procedures and results are presented for the excessive acceleration mode among five causes of loss of stability. SDC Sub-committee, when the Lv1 is not satisfied, mathematical modeling and calculation method for performing complex calculations based on the Lv2 including dynamic stability in waves is presented, and calculations are performed by applying them to an actual ship (13 K oil chemical tanker) through the developed code
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