Experimental investigation of sloshing impact pressure for tank structural design

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (18) : 171-176.

CHEN Xiao-dong 1,3 WEI Zhi-jun 1,2 YUE Qian-jin 1 RUAN Shi-lun 1 ZHAO Xiao-xi 1

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Abstract

Sloshing impact pressure is a key issue in the structural design of the membrane type Liquefied Nature Gas (LNG) carriers. The impact sloshing load includes the magnitude, rise time, duration and skewness. The large-scaled sloshing model experimental method is the most reliable approach to determine impact loads. A series of tests in a 2D rectangular tank subjected to an irregular excitation were performed on the hexapod test rig. The experimental results show that due to interaction between liquid and gas, the peak pressure exhibits large magnitude and short rise time, which might induce large structural dynamic response. The key parameters are analyzed by a statistical method. An idealized triangular impact pressure for the long-term irregular excitation was quantitatively provided. The simplified model consists of the magnitude, rise time, duration and skewness of the impact pressure. This could be a reference for the LNG tank structural design.

Key words

sloshing load / model test / the parameters of the impact load / idealized triangular impact model

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CHEN Xiao-dong 1,3 WEI Zhi-jun 1,2 YUE Qian-jin 1 RUAN Shi-lun 1 ZHAO Xiao-xi 1. Experimental investigation of sloshing impact pressure for tank structural design[J]. Journal of Vibration and Shock, 2015, 34(18): 171-176

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