Comprehensive Evaluation Of Ship Navigation Performance Based On Large Scale Model Test In Actual Ocean Wave

In order to ensure the safety of the ship in all kinds of conditions,the ship is required to have good comprehensive navigation performance,which includes rapidity,maneuverability,seakeeping,wave load,floatability,stability and unsinkability.How to evaluate the comprehensive performance of the ship in the wind and waves scientifically and reasonably has always been a hot and difficult problem in the field of ship research.Therefore,it is necessary to establish a reasonable evaluation system for the comprehensive navigation performance of ships in wind and wave environment.In this paper,the application of large-scale model test in the comprehensive evaluation of ship navigation performance in the actual ocean waves is studied as follows:1.Based on the experiment items of the large-scale model test in the actual ocean waves,a comprehensive evaluation index system of ship navigation performance is established According to the relevant literature and standard guidelines,the values of each evaluation index are selected,and the method of comprehensive evaluation of ship navigation performance is introduced.2.According to the similarity criterion,the large-scale ship model is designed,including the selection of main engine power,wave load measuring backbone design,shafting design,rudder system design,sensor layout,etc.The measurement and analysis of offshore waves are completed,through the comparison with ocean spectrum,the feasibility and rationality of large-scale model test in the offshore area are verified.3.The large-scale self-propelled ship model test in the actual ocean waves is carried out,including the rapidity test,maneuverability test,seakeeping test and wave load test.Through the processing and analysis of the test data,the response values of each evaluation index of the ship under the corresponding 4-6m sea condition are obtained.4.Based on the response value of the evaluation index obtained from the large-scale model test,the comprehensive evaluation of the ship’s navigation performance under different conditions is carried out by using AHP and multi-level fuzzy comprehensive evaluation,which provides a reference for the comprehensive evaluation of the ship’s navigation performance in waves.