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Experiments on the Dynamics of Flexible Cylindrical Shells Impacting on a Water Surface

机译：柔性圆柱壳撞击水面动力学的实验

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This work presents a comprehensive set of experimental results on the water entry of compliant cylindrical shells. Free fall experiments are conducted on a flexible thin cylinder varying the drop height. The problem studied here is not representative of a free cylinder as this is hold by a sledge, which acts as a concentrated mass. The impact dynamics is analyzed from accelerometers, linear position sensors, and through the analysis of high speed images. Further, an experimental methodology based on the modal decomposition method is developed and utilized to reconstruct the overall structural deformation and the distributed strain field on the base of local strain measurements. Fiber Bragg gratings are utilized for this purpose. Results show that the flexibility of the structure plays an important role on the impact dynamics, which is found to completely differ from the impact of rigid structures. The overall deformation of the shell follows the first mode shape of vibration of a free ring, while the stresses are influenced by the superposition of the higher mode shapes that are excited during the impact.
机译：这项工作提出了一系列有关顺应性圆柱壳进水的实验结果。自由落体实验是在一个柔软的细圆柱体上进行的，该圆柱体会改变下落高度。此处研究的问题不是自由圆柱体的代表，因为自由圆柱体是由作为集中质量的滑轨固定的。通过加速度计，线性位置传感器并通过分析高速图像来分析冲击动力学。此外，开发了一种基于模态分解方法的实验方法，并将其用于在局部应变测量的基础上重建整体结构变形和分布应变场。光纤布拉格光栅用于此目的。结果表明，结构的柔韧性在冲击动力学中起着重要作用，这与刚性结构的冲击完全不同。壳体的整体变形遵循自由环振动的第一模式形状，而应力则受到冲击过程中激发的更高模式形状的叠加的影响。

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