A Bayesian inverse dynamic approach for impulsive wave loading reconstruction: Theory, laboratory and field application
A Bayesian inverse dynamic approach for impulsive wave loading reconstruction: Theory, laboratory and field application
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DOI：
10.1016/j.coastaleng.2021.103920
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发表时间：
2021-09
影响因子：
4.4
通讯作者：
A. Antonini;J. Brownjohn;D. T. Dassanayake;A. Raby;James Bassit;A. Pappas;D. D’Ayala
中科院分区：
文献类型：
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作者：
A. Antonini;J. Brownjohn;D. T. Dassanayake;A. Raby;James Bassit;A. Pappas;D. D’Ayala
作用在海洋结构物上的波浪力的测量是一项复杂的任务，无论是在物理实验中，还是在现场，更是如此。在实验室实验中采用的力传感器需要最小水平的结构运动，从而违反了完全刚性结构的主要假设，并引入了系统的动态响应。有时，诱发的振动是如此强烈，以至于它们完全抵消了实验的可靠性。在现场，它甚至更加复杂，因为没有尺寸和能力的力传感器能够测量作用在海洋结构的非常大的区域上的如此巨大的力强度。为此，本次调查提出了一种贝叶斯方法，旨在消除不希望的影响，从直接（实验室应用）或间接（现场应用）测量的波浪力。本文介绍了该方法的三个应用：i）提供MATLAB®程序的合成信号上的理论应用，ii）旨在模拟浅滩上圆柱体上的破碎波载荷的实验期间收集的实验室数据上的实验应用，以及iii）旨在重建在飓风奥菲利亚期间在沃尔夫岩灯塔上产生记录振动的波浪力的现场应用。所提出的方法允许包含现有的信息破碎和破碎波力通过基于过程的信息先验distributions，同时它也提供了正式的框架，通过后验distribution. Noting结果的不确定性量化的结果是，破碎波载荷实验室和现场数据显示出类似的功能。负荷时间序列的特征在于由两个峰值构成的初始脉冲分量，然后是延迟的平滑分量。前两个峰值是由于掺气前缘的初始冲击和先前由初始冲击向上加速的下落水团的突然减速。第三，不太强烈的峰值，是由于之间的相互作用的圆柱体和剩余的水质量所进行的个别wave.Finally，该方法允许正确地识别的脉冲加载组件的长度。这个长度的影响，使用的冲动理论的评估或设计的海洋结构物进行了讨论。
The measurement of wave forces acting on marine structures is a complicated task, both during physical experiments and, even more so, in the field. Force transducers adopted in laboratory experiments require a minimum level of structural movement, thus violating the main assumption of fully rigid structure and introducing a dynamic response of the system. Sometimes the induced vibrations are so intense that they completely nullify the reliability of the experiments. On-site, it is even more complex, since there are no force transducers of the size and capacity able to measure such massive force intensity acting over the very large domain of a marine structure. To this end, this investigation proposes a Bayesian methodology aimed to remove the undesired effects from the directly (laboratory applications) or indirectly (field applications) measured wave forces. The paper presents three applications of the method:i)a theoretical application on a synthetic signal for which MATLAB® procedures are provided,ii)an experimental application on laboratory data collected during experiments aimed to model broken wave loading on a cylinder upon a shoal andiii)a field application designed to reconstruct the wave force that generated recorded vibrations on the Wolf Rock lighthouse during Hurricane Ophelia. The proposed methodology allows the inclusion of existing information on breaking and broken wave forces through the process-based informative prior distributions, while it also provides the formal framework for uncertainty quantification of the results through the posterior distribution.Notable findings are that the broken wave loading shows similar features for both laboratory and field data. The load time series is characterised by an initial impulsive component constituted by two peaks and followed by a delayed smoother one. The first two peaks are due to the initial impact of the aerated front and to the sudden deceleration of the falling water mass previously upward accelerated by the initial impact. The third, less intense peak, is due to the interaction between the cylinder and remaining water mass carried by the individual wave.Finally, the method allows to properly identify the length of the impulsive loading component. The implications of this length on the use of the impulse theory for the assessment or design of marine structures are discussed.