The development of vehicle capability brings growing command on large liquid tank. The disturbance brought by the liquid sloshing that generated in this kind of large liquid tank plays a non-negligible role to the spacecraft. In this paper, we illustrate a changing structure liquid sloshing probability model based on fluid dynamics under microgravity state,and use it as an equivalent model for large amplitude liquid sloshing. The results prove the accuracy of this method by comparing it with the result of CFD method. This proposed equivalent dynamic model take less time to solve to the theoretical method and also requires less storage versus computational fluid dynamics, due to its lower complexity.
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