复合共振激励下弹性液舱低液深液体晃荡实验研究

Experimental Study on Sloshing in Elastic Tank with Low and Partial Filling under Composite Excitation

通过物模实验,对弹性舱内低液深液体在横摇和纵摇复合共振激励下的晃荡问题进行研究,分析了复合共振激励下自由液面波形及自由液面处晃荡压力的变化特征。结果表明:在持续的复合共振激励下,自由液面波形可分为三个阶段,一是小幅度驻波阶段,二是大幅度的驻波与行进波、水跃以及破碎波阶段,三是不规则波阶段;晃荡压力与之对应,自由液面处晃荡压力在第一阶段主要受静水压力影响,呈现小幅度波动增加状态,第二阶段在静水压力与冲击压力共同作用下,晃荡压力快速增加至最大值,第三阶段由于大量破碎波的存在,加之复合激励作用影响,导致晃荡压力呈现出不稳定状态。

The sloshing problem of low and partial filling in elastic tank under the composite excitation of roll and pitch was studied by physical model experiment.The variation characteristics of the free surface waveform and the sloshing pressure at the free surface were analyzed.The results show that the free surface waveform can be divided into three stages under the long-term composite resonant excitation.The first stage is the small amplitude standing wave.The second stage are the large standing wave and the traveling wave,the water jump and the breaking wave.And the third stage is irregular wave.Waveform change corresponding to sloshing pressure,the sloshing pressure at the free surface is mainly affected by the hydrostatic pressure in the first stage,showing a small fluctuation state.The pressure is rapidly increased to the maximum value affected by the hydrostatic pressure and the impact pressure in the second stage.The sloshing pressure is unstable due to the existence of a large number of broken waves and the effect of composite excitation in the third stage.