Bayesian oma of offshore rock lighthouses : Surprises with close modes, symmetry and alignment
Bayesian oma of offshore rock lighthouses : Surprises with close modes, symmetry and alignment
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近海岩石灯塔的贝叶斯 oma：接近模式、对称性和对齐的惊喜
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
A. Antonini
中科院分区：
文献类型：
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作者：
J. Brownjohn;A. Raby;S. Au;Zuo Zhu;Xinrui Wang;A. Antonini
一组七个岩石灯塔周围的不列颠群岛进行了研究，结合强制和环境振动测试执行一些极端的后勤限制。圆形截面砖石塔的强迫振动试验结合实验模态分析，确定了与振动器相同的对准模式以及直升机甲板改造的一些有趣影响，而操作模态分析揭示了模态形状对准的相当大程度的不确定性。因此，使用贝叶斯操作模态分析来消除不确定性，并找到最佳的代表性的模式形状的方向。虽然完美的轴对称塔将显示一个单一的频率全向模式，OMA揭示了分裂模式，并允许无偏见的方向性视图。这些模式的形状方向的变化性和不确定性，进一步揭示使用贝叶斯OMA。
A set of seven rock lighthouses around the British Isles was studied by a combination of forced and ambient vibration tests executed with some extreme logistical constraints. Forced vibration testing of the circular section masonry towers combined with experimental modal analysis identified modes with alignment assumed the same as the shaker as well as some interesting effects of helideck retrofit, whereas operational modal analysis revealed the considerable degree of uncertainty in mode shape alignment. Hence Bayesian operational modal analysis was used to characterise the uncertainty and find the best representation of mode shape direction. While perfectly axisymmetric towers would show a single frequency omnidirectional mode, OMA reveals the split modes and allows un unbiased view of directionality. The variability and uncertainty of these mode shape directions are further revealed using Bayesian OMA.
影响因子：
3.9
作者：
Brownjohn, James Mark William;Raby, Alison;Dobson, Peter
通讯作者：
Dobson, Peter