Study on the Stability Calculation and Checking of Liquid Cargo Ships

Base on the existing calculation method of ship stability,this article analyzes the various stability calculation of liquid cargo ship,which conclude the calculations of floating condition,statical stability,dynamical stability,initial stability,high inclination-angle stability and weather criterion.The influence of trimming and free surface to floating condition and stability of liquid cargo ship are considered,a calculation method of stability curve correction for free liquid at any loading condition is proposed,which achieves a real-time calculation of stability curve correction for liquid cargo ship.A large LNG carrier is taken as an example,its floating condition and statical stability are calculated with this method under the harbor condition.The results are compared with those provided in the loading manual of the ship,which verified the precision and feasibility of the proposed calculation method.