Analysis And Design Of Vertical Replenishment Landing Buffer For Aggregate Ammunition

In recent years,with the vigorous development of China’s aircraft carrier industry and the continuous expansion of its naval power,China should assume more responsibilities as a major country in the vast ocean.China has sent its fleets to carry out ocean-going escort missions for many times.Ocean-going operations have become an inevitable trend of The Times,and maritime replenishment capability has become an important standard to measure naval strength.Vertical replenishment is applicable to both the sailing state and the anchoring state of ships,and is regarded as the fastest and most effective replenishment method by various countries.As an important strategic material,ammunition is an important indicator to measure the comprehensive replenishment capability of a fleet by ensuring the safety of ammunition replenishment and the replenishment speed in a limited time.In this dissertation,the buffer analysis and design are carried out for the landing problem of ammunition in the vertical replenishment process,aiming at realizing the safe and high-speed replenishment of ammunition.Firstly,this paper studies the vertical replenishment movement,analyzes the sway and heave problems of ships under certain sea conditions,and simultaneously obtains the motion state of the loaded ammunition and deck surface at the moment of contact,taking the motion state as the input condition for buffer analysis and design.According to the requirements of our ammunition onboard and support requirements,The maximum acceleration during recharge is constrained.In order to achieve better buffering,theoretical analysis and experimental fitting were carried out on the constitutive model of rubber materials,and a viscoelastic constitutive model containing the hyperelastic part and viscoelastic part was built.Through uniaxial compression experiments on different materials,the model parameters were obtained,and the three models were imported into Ansys to establish the finite element material model.Based on this model,the finite element simulation analysis of rubber material was established.By comparing the stress-strain curves of the three models,the buffering ability was preliminarily judged.The selection of buffer material was further improved by establishing the buffering mechanics model.Taking a certain type of fully loaded ammunition as the research object,after simplifying the vertical replenishment motion model,the kinematic simulation of the motion was carried out,including vertical free fall motion and incline drop motion.The finite element analysis was carried out for the two kinds of motion,and finally the reliability and accuracy of the simulation model was verified by physical tests.