基于FBG对简支梁模型跨中挠度测量的研究
Research on Mid-Span Deflection Measurement of Simply Supported Beam Model Based on FBG
DOI: 10.12677/JSTA.2022.102018, PDF,   
作者: 高 鹏, 廖帮全*, 季春波, 李宁伟, 翟媛媛, 付连宇：天津工业大学，物理科学与技术学院，天津
关键词: 光纤布拉格光栅；挠度；简支梁； Fiber Bragg Grating； Deflection； Simply Supported Beam
摘要: 挠度在某种程度上反映了梁的整体竖向刚度和线性变化特征，挠度检测为评判梁或柱型结构的安全性与耐久性提供重要的依据，因此测量挠度尤为重要。光纤光栅有着对应变高度敏感的特性，可以通过谐振波长的漂移量来测量梁的挠度。本文应用光纤布拉格光栅(Fiber Bragg Grating, FBG)对简支梁跨中进行了挠度测量，研究了梁上不同位置的荷载对梁的跨中挠度的影响。从理论出发论证了荷载施加的位置会对测量结果造成影响，基于这一点对梁上荷载的不同位置进行了实验研究。实验中以简支梁为例，基于FBG应变传感器进行了跨中挠度的测量，实验验证了理论的可行性和正确性，同时也对实验中产生的误差进行了分析。将梁上荷载位置这一参数引入到研究中来，相对于常规测量丰富了研究维度，为今后研究梁的挠度变化提供了一定的理论参考。
Abstract: The deflection reflects the overall vertical stiffness and linear variation characteristics of the beam to some extent, and deflection detection provides important basis for evaluating the safety and durability of beam or column structure, so measuring deflection is particularly important. Fiber grating is highly sensitive to strain. The deflection of the beam can be calculated by the drift of resonant wavelength. In this paper, the fiber Bragg grating (FBG) is used to measure the deflection of the simply supported beam. The influence of load at different positions on mid-span deflection of beam is proposed and studied. It is theoretically demonstrated that the position of the load applied will affect the measurement results. Based on this, different positions of the load on the beam are studied. In the experiment, taking the simply supported beam as an example, the mid-span deflection was measured based on the FBG strain sensor, and the feasibility and correctness of the theory were verified. At the same time, the errors generated in the experiment were analyzed. The load position on the beam is introduced into the study, which enriches the research dimension compared with the conventional measurement, and provides a theoretical reference for the future study of beam deflection change.
文章引用：高鹏, 廖帮全, 季春波, 李宁伟, 翟媛媛, 付连宇. 基于FBG对简支梁模型跨中挠度测量的研究[J]. 传感器技术与应用, 2022, 10(2): 146-155. https://doi.org/10.12677/JSTA.2022.102018

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