Estimating deflection of a simple beam model using fiber optic Bragg-grating sensors
Estimating deflection of a simple beam model using fiber optic Bragg-grating sensors
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DOI：
10.1177/0014485104045431
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发表时间：
2004-08-01
影响因子：
2.4
通讯作者：
Cho, NS
中科院分区：
文献类型：
--
作者：
Kim, NS;Cho, NS
在本文中，我们开发了一种方法来估计桥梁挠度使用光纤布拉格光栅（FBG）应变传感器。几何轮廓是反映土木结构尤其是桥梁整体性能的重要因素，对桥梁结构完整性的评估至关重要。过去，由于缺乏合适的现场测量桥梁挠度曲线的方法，挠度的测量一直局限于沿桥沿着的几个离散点，而且测点局限于安装有位移传感器的位置。然而，通过应用经典梁理论，一个公式被重新安排，以估计连续偏转的轮廓，通过使用直接从几个点测量的应变。此外，光纤光栅应变传感器，这是电磁，无噪声和多点可测的，以获得更准确和稳定的弯曲应变。进行回归分析以从测量的应变数据获得应变函数。最后，通过将应变函数应用于公式，可以估计挠度曲线。实验测试也进行了验证所开发的方法。
In this paper, we develop a method to estimate the bridge deflection using fiber optic Bragg-grating (FBG) strain sensors. For most structural evaluation of bridge integrity, it is very important to measure the geometric profile, which is a major factor representing the global behavior of civil structures, especially bridges. In the past, because of the lack of appropriate methods to measure the deflection curve of bridges on site, the measurement of deflection has been restricted to just a few discrete points along the bridge, and the measuring points have been limited to the locations installed with displacement transducers. However, by applying classical beam theory, a formula is rearranged to estimate the continuously deflected profile by using strains measured directly from several points. In addition, FBG strain sensors, which are electromagnetic, noise-free and multipoint measurable, are employed to obtain flexural strains more accurately and stably. The regression analysis is performed to obtain a strain function from the measured strain data. Finally, the deflection curve can be estimated by applying the strain function to the formula. An experimental test has also been carried out to verify the developed method.