Displacement Estimation Using Multimetric Data Fusion
Displacement Estimation Using Multimetric Data Fusion
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DOI：
10.1109/tmech.2013.2275187
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发表时间：
2013-12-01
影响因子：
6.4
通讯作者：
Jung, Hyung-Jo
中科院分区：
文献类型：
--
作者：
Park, Jong-Woong;Sim, Sung-Han;Jung, Hyung-Jo
虽然位移是结构行为的宝贵信息，但测量大型土木结构的位移通常具有挑战性且成本高昂。为了克服在直接测量中发现的困难，例如使用线性可变差分Transformer和基于激光的方法，间接位移估计方法被替代地开发。这种间接方法通常依赖于相对成本有效且便于测量的加速度或应变。然而，这些测量有其自身的特点，限制了间接估计的广泛应用。例如，由于加速度的双重积分导致估计位移的低频漂移，高通滤波器通常用于抑制漂移，假设位移接近于零均值过程;应变难以用于高频模式。这些类型的限制可以通过融合不同类型的测量来解决。本研究发展了一种基于多量测数据的间接位移估计方法（即，加速度和应变），可以估计非零平均动态位移。所提出的方法进行了数值验证，表现出更好的估计比单一的测量为基础的方法。此外，所提出的方法的性能进行了验证，从索洛克桥，在韩国的斜拉桥的动态响应测量数据。
While displacement is valuable information for the structural behavior, measuring displacements from large civil structures is often challenging and costly. To overcome difficulties found in direct measurements such as using linear variable differential transformer and LASER-based methods, indirect displacement estimation approaches are alternatively developed. Such indirect approaches in general rely on acceleration or strain that is relatively cost effective and convenient to measure. However, these measurements have own characteristics that limit wider application of the indirect estimation. For example, as the double integration of acceleration results in the low-frequency drift in the estimated displacement, high-pass filters are often used to suppress the drift, assuming displacements are close to a zero mean process; strain is difficult to use for high-frequency modes. These types of limitations can be resolved by the fusion of different types of measurements. This study develops an indirect displacement estimation method based on the multimetric data (i.e., acceleration and strain) that can estimate nonzero mean, dynamic displacements. The proposed approach is numerically validated, showing better estimation than the single measurement-based methods. Furthermore, the performance of the proposed approach is verified using dynamic response data measured from the Sorok Bridge, a cable-stayed bridge in Korea.