Journal of Astronautics ›› 2016, Vol. 37 ›› Issue (3): 268-274.doi: 10.3873/j.issn.1000-1328.2016.03.004

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Modeling Analysis of Large Amplitude Liquid Sloshing Under Lateral Excitation

MIAO Nan, LI Jun feng, WANG Tian shu   

  1. School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
  • Received:2015-04-13 Revised:2015-05-13 Online:2016-03-15 Published:2016-03-25


An equivalent mechanical model for large-amplitude liquid sloshing in partially filled spherical tanks subject to lateral excitations is investigated in consideration of both translational and rotational excitations. A new equivalent mechanical model is established in this paper, and the hypothesis is first proposed that the static equilibrium liquid surface is perpendicular to the orientation of equivalent gravity. A better simulation of large-amplitude liquid sloshing is shown by decomposing large-amplitude motion of the liquid into bulk motion following the equivalent gravity and additional small-amplitude sloshing. The effectiveness and accuracy of the model are verified by comparing the sloshing forces and torques with results of the traditional equivalent model and Flow-3d. The model can be used for practical engineering problems such as hovering over moon and obstacle avoidance during lunar soft landing.

Key words: Liquid sloshing, Equivalent mechanical model, Static equilibrium, Large-amplitude sloshing, Spherical tank

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