Research On Random Vibration Characteristics Of Liquid Storage Container Based On Fluid-Structure Interaction

With economic development,liquid storage containers are more and more widely used in industrial waste and chemicals.in transportation.The liquid storage container is not only subjected to the static pressure of the liquid,but also to the dynamic pressure of the liquid due to falling,vibration,etc.,which will lead to the damage of the liquid storage container.In this paper,the vibration characteristics of the liquid storage container and its contents are explored by means of experiments,modal,liquid sloshing,and two-way fluid-solid coupling numerical simulation analysis,which can serve as a reference for the related research of liquid storage containers and the selection of liquid storage containers.The main research contents of this paper are as follows:Firstly,by summarizing the analytical theory,equivalent mechanics,numerical simulation and coupled vibration theory of liquid sloshing,it lays a theoretical foundation for experimental analysis and numerical simulation analysis.Secondly,the frequency sweep characteristics of different contents in 10 L and 20 L containers and the frequency domain and time domain characteristics under random excitation were explored by means of experiments,and the frequency sweep and random vibration tests were carried out on the packaging containers for different contents of liquid and solid.Intensity and content volume are variables to compare and analyze the acceleration responses of different containers.The results show that: in a 10 L container,when the content is liquid,the first-order resonance frequency and response acceleration of the liquid storage container have greater influence than when the content is solid.When the liquid content is 50% and 80%,the effect is obvious;when the content is liquid,the PSD distribution is more dispersed than when the content is solid,and the acceleration response energy grms value is larger than that when the content is solid,and the response is when the liquid content is 50%.The energy is the largest,and the increase of the excitation intensity has a significant impact on the response of the liquid storage container when the content is liquid;the normal distribution can well describe the time domain distribution of the random vibration response of the liquid storage container,and the acceleration response distribution and Gaussian distribution when the content is liquid The deviation is obvious.The conclusion of the 20 L container is basically the same as that of the 10 L container,but the effect of the increase of vibration intensity on the liquid storage container is not as obvious as that of the 10 L container.Then,the fluid modes of different types of vessels were explored through numerical simulation of acoustic modes,and their equivalent mechanical models were verified and corrected.The double exponential function is more suitable for the fluid mode of the liquid storage container.Finally,the response of liquid storage containers of different materials under random excitation was studied by liquid sloshing and two-way fluid-structure interaction numerical simulation methods.In general,the research results of this paper lay a foundation for further understanding the liquid sloshing phenomenon of the liquid storage container and for understanding the vibration characteristics of the liquid storage container.The proposed experimental method and simulation method can provide a certain guiding significance for the manufacture and selection of the liquid storage container.