DIC measurement of deflection waves travelling along a thin flexural plate floating at water surface
DIC measurement of deflection waves travelling along a thin flexural plate floating at water surface
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DOI：
10.1016/j.oceaneng.2022.113079
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发表时间：
2022-12
影响因子：
5
通讯作者：
K. Iijima;Chong Ma;Ananda Raiz Pambela;Takeru Maeda
中科院分区：
文献类型：
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作者：
K. Iijima;Chong Ma;Ananda Raiz Pambela;Takeru Maeda
本文通过一系列水箱测试研究了沿着浮动薄板传播的偏转波。试验采用立体数字图像相关（DIC）测量系统，配备两组高速摄像机，通过变形前后图像的差异来找出结构中挠度和应变的瞬时分布。该模型由橡胶泡沫制成，其弹性模量是通过四点弯曲和自由振动试验得出的。在水箱测试中识别出沿着水面弹性薄板传播的偏转波。将测量结果与基于线性势流理论的数值模拟结果进行比较。测量结果和数值结果之间的一致性在挠度和应变分布方面被发现是令人满意的。此外，还发现并讨论了包括二次谐波和三次谐波在内的非线性分量，其特性与斯托克斯波理论的预测略有不同。
This paper addresses the deflection waves traveling along a floating thin plate using a series of tank tests. A measurement system using stereo Digital Image Correlation (DIC) with two sets of high-speed cameras is adopted in the tests to find the instantaneous distribution of deflection and strain in a structure by taking the difference between the images before and after deformation. The model is made of rubber foam and its elastic modulus is found from four-point bending and free-vibration tests. The deflection waves traveling along a thin elastic plate at the water surface are identified in the tank tests. The measured results are compared with the numerical simulation results based on a linear potential flow theory. The agreement between the measurements and numerical results is found to be satisfactory in terms of deflection and strain distributions. Further, nonlinear components including the second and third harmonics, whose properties deviate slightly from the predictions by Stokes wave theory, are found and discussed.