Study On Dynamic Response Of Liquid Storage Container And Characteristics Of Liquid Sloshing Under Drop Impact

Liquid storages are widely used in the defense,aerospace and other field.The drop impact process safety issues are more and more attention.The transient response of the container to the ground impact is characterized by large deformation and non-linear.At the same time,there is no periodic attack pressure resulting in a strong non-linear sloshing.The pressure can bring damage to container.Accurate calculation of container structure dynamic response and liquid sloshing load is necessary to the safe of liquid storage containers.Since the liquid container dropping and the fluid structure interaction are complexity and highly nonlinear.At present,the research of such problems also rarely was found in the reports.Therefore,the paper was focused on the liquid sloshing for further research based on the dynamic analysis of the liquid container structure.The following work will be completed:1.The finite element model including container,water and air was established based on ALE Finite Element Method by MSC.Dytran.A method of calculating the liquid sloshing in the liquid container under the impact load was summarized.The results of simulation including the impact acceleration and the impact pressure of the liquid were obtained and compared with the results of the related literatures,which proved the feasibility and rationality of the method.2.In this paper,the influence of various working conditions on the drop impact of the liquid container was analyzed.According to the five parameters of storage volume,vertical velocity,horizontal velocity,pitch angle and roll angle,orthogonal test design method was used.The results showed that the influence of the vertical velocity on the container was highly significant in the five factors,and the order of the influence of the dynamic response was also obtained.According to the actual situation,fixed horizontal velocity and vertical velocity,the conclusion showed that the interaction effect of the storage volume and the roll angle were significant.3.The response mechanism characteristics of liquid sloshing dynamics on drop height,reservoir volume and falling angle was clear by analyzing collision course.The results showed that the impact strength of the liquid sloshing increased almost linearly with the increase of the drop height and the storage volume.But when the storage volume was more than 50%,the velocity of the liquid flow and the deformation of the container were not significantly affected by the storage volume.The results showed that the impact strength of the liquid sloshing increased almost linearly with the increase of the drop height and the storage volume.But when the storage volume was more than 50%,the velocity of the liquid flow and the deformation of the container were not significantly affected by the storage volume.The maximum plastic strain and the drop angle of the storage container show a " ?" type relationship.When the drop angle was greater than 20 °,the plastic deformation occurred at the top of the when container colliding with the ground,and the deformation increased with the drop angle.4.In order to understand the relationship between the internal structure changes on the sloshing characteristics and the dynamic response of the structure.In this paper,the liquid velocity vector distribution,the liquid impact pressure distribution,the free liquid surface shape and the dynamic response of the container structure were analyzed on the three structural forms of the container,such as no obstructions,setting baffles,and setting bulkheads.It was obvious that adding the block structure is remarkable to suppress the sloshing of the liquid.At the same time,the impact pressure of the liquid on the container structure increased,the deformation of the container becomes larger,and the structural reliability was reduced.