METHOD FOR ASSESSMENT AND RESTORATION OF THE INITIAL STABILITY OF THE VESSEL Russian patent published in 2022 - IPC B63B39/14 

FIELD: shipbuilding.

SUBSTANCE: invention relates to shipbuilding and concerns the verification (control) of the stability of ships after loading them with off-design and non-standard cargo. The essence of the invention lies in the fact that the metacentric height (h₀) calculated under conditions of incomplete information about the accepted cargo is taken as the upper limit of the interval in which its actual value is located, and for the lower, the minimum possible value determined from the condition that the roll of the vessel (θ₀) is caused by the negative initial stability of the vessel, a safe value of the metacentric height is also assigned, after which two low-lying tanks are selected for filling with liquid ballast from the conditions of non-tilting and non-stalling of the vessel and initially fill the one on board that entered the water, then the roll angle of the vessel (θ₁) is measured and, simultaneously, the increased values of the metacentric heights of the vessel are calculated as well as the corresponding values of the roll angles then the second tank is filled with liquid ballast and, after filling it, the roll angle of the vessel is measured again (θ₂), and the newly increased values of the metacentric heights are calculated as well as the corresponding values of the roll angles after which the measured and calculated values of the roll angles are compared and the actual value of the initial metacentric height of the vessel (h_fact) is estimated from the condition that: 1) if: then the actual initial stability of the vessel is ensured and its metacentric height is within: 2) if: then the actual metacentric height of the vessel is positive (h_fact>0), however, its value is less than the safe value, while it lies within: .

EFFECT: invention makes it possible to assess and restore (increase) the stability of the vessel in conditions of uncertainty or incomplete information about the weight load of the vessel and low accuracy of the initial calculation of the metacentric height.

1 cl, 3 dwg