Abstract Predicting the response of air-backed panels to impulsive hydrodynamic loading is essential to the design of marine structures operating in extreme conditions. Despite significant effort in this area of research, the lack of full-field measurement techniques of structural dynamics and flow physics hinders our understanding of the fluid–structure interaction. To fill this gap in knowledge, we designed a laboratory-scale experiment to elucidate fluid–structure interaction associated with impulsive hydrodynamic loading on a flexible plate. A combined experimental approach based on digital image correlation (DIC) and particle image velocimetry (PIV) was developed to afford spatially- and temporally-resolved measurements of the plate deflection and fluid velocity. From the velocity field measured through PIV, the hydrodynamic loading on the structure was estimated via a pressure-reconstruction algorithm. Experimental results point at a strong bidirectional coupling between structural dynamics and flow physics, which influence temporal and spatial patterns in counter-intuitive ways. While the plate deflection follows the fundamental in-vacuum mode shape of a clamped plate, the pressure exhibits a complex evolution. Not only does the location of the peak loading on the plate alternates between the clamp and the center as time progresses, but also the time evolution of the peak loading anticipated the peak displacement of the plate. This study contributes a new methodological approach to study fluid–structure interaction in three dimensions, offering insight in the physics of air-backed impact that could inform engineering design and scientific inquiry.

中文翻译：

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同时数字图像相关/粒子图像测速法在气垫冲击期间展开流体-结构相互作用

摘要 预测气垫板对冲击水动力载荷的响应对于在极端条件下运行的海洋结构的设计至关重要。尽管在该研究领域做出了巨大努力，但缺乏结构动力学和流动物理学的全场测量技术阻碍了我们对流固耦合的理解。为了填补这一知识空白，我们设计了一个实验室规模的实验来阐明与柔性板上的脉冲流体动力载荷相关的流固耦合。开发了一种基于数字图像相关性 (DIC) 和粒子图像测速 (PIV) 的组合实验方法，以提供板偏转和流体速度的空间和时间分辨测量。从通过 PIV 测量的速度场，结构上的流体动力载荷是通过压力重建算法估计的。实验结果表明结构动力学和流动物理之间存在很强的双向耦合，这会以违反直觉的方式影响时间和空间模式。虽然板偏转遵循夹紧板的基本真空模式形状，但压力表现出复杂的演变。随着时间的推移，不仅板上峰值载荷的位置在夹具和中心之间交替，而且峰值载荷的时间演变也预测了板的峰值位移。这项研究为研究三个维度的流固耦合提供了一种新的方法论方法，提供了对空气支持撞击物理学的见解，可以为工程设计和科学探究提供信息。