Abstract In liquid storage tanks, rotary sloshing occurs when the frequency of the lateral harmonic load is near the lowest frequency of the tank–liquid system. Rotary sloshing is a type of sloshing that modifies the tank response, which may cause instabilities of the tank wall. However, the consequences of rotary sloshing for the development of strain in the tank wall have not been elucidated. This paper presents an experimental determination of the effects of rotary sloshing on the development of strain and acceleration at various locations of a storage tank. A low-density-polyethylene tank containing water was tested using a shake table. Nine excitations with frequencies near the first free-vibration frequency of the tank–water system were employed. To suppress rotary sloshing, a high-density foam floating lid was utilised as a barrier. Results reveal rotary sloshing boosts not only the development of both hoop and axial strain but also the acceleration in the horizontal direction perpendicular to the excitation. The lid reduced the maximum hoop and axial strain by 500% and 400%, respectively compared to that when rotary sloshing occurs. Moreover, the lid suppressed the nonplanar sloshing by erasing the first three free-vibration frequencies of the tank–water system without the lid.

中文翻译：

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抑制旋转晃荡对储液罐动态响应的实验研究

摘要 在储液罐中，当横向谐波载荷的频率接近罐液系统的最低频率时，就会发生旋转晃荡。旋转晃动是一种改变油箱响应的晃动，可能导致油箱壁不稳定。然而，旋转晃动对罐壁应变发展的影响尚未阐明。本文介绍了旋转晃动对储罐不同位置应变和加速度发展影响的实验确定。使用振动台测试了一个装有水的低密度聚乙烯罐。采用了九个频率接近水箱-水系统第一自由振动频率的激励。为了抑制旋转晃动，高密度泡沫浮盖被用作屏障。结果表明，旋转晃荡不仅促进了环向应变和轴向应变的发展，而且还促进了垂直于激励的水平方向上的加速度。与发生旋转晃动时相比，盖子将最大环向应变和轴向应变分别降低了 500% 和 400%。此外，盖子通过消除没有盖子的水箱-水系统的前三个自由振动频率来抑制非平面晃动。