Reliability Analysis of Polar Ship Propulsion Shafting System Based on Fatigue Failure Mechanism
Due to the particularity of the navigation area,the polar ship propulsion shafting is affected by the ice-paddle interaction when sailing in the ice area,which puts forward a high requirement for its reliability.Fatigue failure of propulsion shafting is more likely to occur due to high cyclic load caused by ice-propeller interaction.Therefore,a reliability evaluation method based on fatigue failure mechanism is proposed to analyze the reliability of propulsion shafting of polar ships.Firstly,the finite element model of propulsion shafting is established,and the key components are identified according to the analysis results of four conditions of ice-propeller interaction.Then,the uncertainty of material parameters and load parameters during fatigue failure reliability analysis is quantified,and the fatigue life distribution of key components is obtained by Monte Carlo simulation and Kriging proxy model based on fatigue failure mechanism model.Then,the reliability model of propulsion shafting is established,the reliability analysis of the system is carried out,and the reliability function curve is drawn.Finally,the key factors affecting the fatigue life of shafting are obtained through sensitivity analysis.The results show that the proposed method can effectively evaluate the reliability of polar ship propulsion shafting by considering the ice-propeller interaction,analyzing the fatigue life and establishing the reliability function curve,and has certain engineering significance for the reliability analysis of polar ship propulsion shafting.
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