Impact Model And Response Characteristics Analysis Of Propulsion Shaft System With High Elastic Coupling

As important national defense equipment,ships may be attacked by explosive weapons during the battle.As the core component of the ship’s power system,the propulsion shafting is directly related to the combat capability and vitality of the ship.In order to evaluate the impact resistance of the ship’s propulsion shafting from the design level,this paper firstly studies the modeling method of the high-elasticity coupling.On the basis of the high elastic coupling model research,a calculation model of the impact resistance of the propulsion shafting is established,and then the impact resistance calculation of the propulsion shafting is carried out.The main work of the paper are as follows:(1)According to the physical characteristics of the highly elastic coupling,a solid model and an equivalent model are established.The equivalent model has the characteristics of simple modeling,high calculation efficiency and high calculation accuracy,and can play a huge role in finite element analysis.Especially for the impact resistance calculation of the propulsion shaft system,the equivalent model of the high elastic coupling can meet the requirements of calculation accuracy,with stronger pertinence and greater reference value for the analysis results.The idea of the highelasticity coupling equivalent model in this paper can guide the rapid analysis and prediction of the impact resistance of the propulsion shafting with the high-elasticity coupling in the future.(2)Taking a certain shaft system as the research object,the solid model and equivalent model of the highly elastic coupling are combined with the shaft system respectively,and the concepts of pure beam model,beam-solid hybrid model,solid equivalent model and full solid model are proposed.According to the calculation analysis,the inherent characteristics of the four models are basically the same.In order to save the calculation cost,the equivalent model is finally selected as the finite element model for impact calculation.The equivalent model has both the calculation efficiency of the beam model and the calculation accuracy of the solid model,and its establishment method provides a new modeling idea for the impact calculation and reliability analysis of the propulsion shafting design stage.(3)The equivalent model of the propulsion shafting is used to calculate the impact resistance of the propulsion shafting.Combined with the standard,the dynamic design analysis method and the time history method are used to calculate the impact.According to the different shock resistance evaluation parameters of different parts of the propulsion shafting,the shock displacement response and stress response are extracted respectively.Comparing the results of the two calculation methods and summarizing the characteristics of the two calculation methods can provide a reference for the selection of impact calculation methods.(4)Aiming at the analysis of the impact resistance of the high elastic coupling,the impact calculation of the high elastic coupling separated from the shaft system is carried out by using the standard calculated impact load and the system impact calculation result as the excitation.In addition,through the research and analysis of the full text,the design method of the highly elastic coupling based on the impact resistance calculation of the propulsion shaft system is sorted out.By analyzing the change of the stiffness of the adjacent bearing of the highly elastic coupling,the influence law of some parameters on the change of the shock response is obtained.