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超大型浮式液化天然气生产储卸装置(Floating Liquefied Natural Gas,FLNG)储舱中液体晃荡引起的砰击荷载会导致舱壁结构强度破坏.室内大尺度晃荡模型实验是最能真实反映砰击物理过程的研究方法.由于液体和气体均具有可压缩性,导致砰击压力瞬时增大,因此,实验研究中如何准确地测量砰击载荷是关键问题.为了研究测量砰击载荷的准确性、灵敏性和可靠性,采用了大吨位的六自由度运动平台与大尺度模型舱,分别采用薄膜型和针孔型压阻式传感器对储舱中液体晃荡引起的砰击载荷进行测量,并对砰击过程进行了实验观测.从时域角度提出了从砰击发生时间来分析流体砰击垂直舱壁的过程,并采用相关性方法分析测量区域内砰击载荷的空间相关性(垂直、水平).结果表明,针孔型压力传感器对气体衰减振荡的物理现象更敏感,而薄膜型压力传感器测量的均值效应较突出;冲击点位置下方的区域在水平和垂向上具有线性相关的特性,建议在冲击点附近采用阵列式压力传感器布局,可以更准确地捕捉冲击点的发生位置和载荷量级.
The slamming load caused by liquid sloshing in a large floating Floating Liquefied Natural Gas (FLNG) storage tank can lead to the failure of the bulkhead structure. The indoor large-scale sloshing model experiment is the most realistic reflection of slamming physics Process method.As the liquid and gas are compressible, resulting in a transient increase in the slamming pressure, the experimental study of how to accurately measure the slamming load is the key issue.In order to study the accuracy of measuring slamming load, sensitive Sexual and reliability, the use of large-tonnage six-DOF motion platform and large-scale model cabin, respectively, the use of thin-film and pinhole piezoresistive sensors for liquid tank sloshing caused by the slamming load was measured, and bang The process of the slamming is analyzed experimentally from the time domain, and the analysis of the slamming vertical slab wall from the time of slamming is carried out. The correlation method is used to analyze the spatial correlation (vertical and horizontal) of slamming load in the measuring area. The results show that the pinhole pressure sensor is more sensitive to the physical phenomenon of gas decay oscillation, while the membrane pressure sensor measures the average effect more prominent. Region beneath the hitting point positions associated with linear characteristics in the horizontal and vertical recommended pressure sensor array layout in the vicinity of the point of impact can be more accurately capture the order of occurrence position and the point of impact loads.