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首页> 外文期刊>Ocean Engineering >Rapid direct-mode shape expansion for offshore jacket structures using a hybrid vector
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Rapid direct-mode shape expansion for offshore jacket structures using a hybrid vector

机译：使用混合矢量对海上夹层结构进行快速直接模式形状扩展

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摘要

A rapid direct-mode shape expansion methodology is proposed for offshore jacket structures. When sensors are not positioned at an underwater portion of the offshore structure, rapid mode shape expansion techniques should be used for structural damage detection. This work applies a hybrid vector to expand the mode shape. The hybrid vector is constructed by measured values at master degrees of freedom (DOFs) and constant values at slave DOFs based on a series of modification factors. One theoretical development is that the proposed approach is a direct method for unmeasured component estimation, which contrasts with traditional methods. The other development is that the proposed approach is a non-iterative method, which ensures the efficiency of unmeasured mode shape value estimation; a jacket platform is chosen for numerical studies, and the results show that the approach provided a reliable estimation of unmeasured components, even for higher mode shapes, when modelling errors are neglected and the measurement noise is in a certain range. The performance of the proposed method was also investigated using dynamic tests from a steel platform experiment. The results confirm that the proposed method outperforms commonly used existing expansion methods.
机译：提出了一种用于海上夹层结构的快速直接模式形状扩展方法。当传感器未放置在海上结构的水下部分时，应使用快速模式形状扩展技术来检测结构损坏。这项工作应用了混合矢量来扩展众数形状。基于一系列修改因子，混合矢量由主自由度（DOF）的测量值和从动DOF的恒定值构成。一个理论上的发展是，该方法是一种直接的不可测成分估计方法，与传统方法形成对比。另一个发展是，所提出的方法是一种非迭代方法，可确保未测模式形状值估计的效率。选择了外套平台进行数值研究，结果表明，当忽略建模误差且测量噪声在一定范围内时，即使对于较高模态的形状，该方法也可以对未测组件提供可靠的估计。还使用来自钢平台实验的动态测试研究了该方法的性能。结果证实，所提出的方法优于常用的现有扩展方法。

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