Research On Calculation Method Of Damaged Stability And Its Application In Loading Situation

From January 1,2016,all oil tankers,tankers,chemical tankers,and other oil tankers must be required to install stowage instruments that have a deterministic calculation method to calculate damage stability.Based on this background,this paper studies the damage stability calculation method.In order to improve the calculation speed and efficiency,a threedimensional extended hydrostatic data table is proposed for offline calculation of floating parameters and geometric elements in each floating state.This paper studies the calculation of ship damage stability by means of probabilistic damage stability calculation method and deterministic damage stability calculation method.Calculate the subdivision index and limit GM curve of dry bulk carriers and other ship types by calculating different intermediate parameters;use the three-dimensional design model of the hull and cabin of oil tankers and other ship types to study the calculation methods of the ship’s floating state and stability in the stowage instrument.The work is as follows:1.Summarize and summarize the current relevant conventions and regulations,and clarify the scope of application and criteria for damage stability in the regulations.2.In-depth research has been done on the damage stability calculation method,especially for the deterministic calculation damage stability method.3.The calculation of the ship’s deterministic method to calculate the damage stability is systematically studied,and two basic calculation methods of the deterministic method are given.The actual ship data of the M ship of a liquid chemical tanker is completed by the loading instrument.In the calculation example,the deterministic method is used to calculate the intact stability and the damage stability of the cabin,and the weight increase method is used to calculate the damage stability of some cabins under the assumed loading conditions in the intermediate stage of flooding.4.The calculation and verification of examples in the stowage instrument show that the Li Xian calculation method proposed in this paper using the three-dimensional extended hydrostatic data table is effective.The calculation results of the calculation examples in this paper verify the feasibility and accuracy of the algorithm by comparing with the values in the loading manual.And apply the algorithm in this paper to the loading instrument,and complete the example calculation.In the case calculation,it is verified that the method proposed in this paper for offline calculation of relevant floating parameters through the three-dimensional extended hydrostatic data table is feasible,has a certain practical value,and is suitable for the application in the loading instrument.