激光与光电子学进展, 2017, 54 (7): 070602, 网络出版: 2017-07-05   

基于长标距光纤布拉格光栅阵列动态响应的参数识别

Parametric Identification of Dynamic Response Based on Long-Gauge Fiber Bragg Grating Arrays
作者单位
1 苏州科技大学土木工程学院, 江苏 苏州 215011
2 江苏省结构工程重点实验室, 江苏 苏州 215011
摘要
研究了长标距光纤布拉格光栅(FBG)传感技术,利用链式阵列方法采集梁的动态响应,实现了车速、频率和振型等动态参数的识别。对单个FBG施加预应力并将其封装成传感器,以扩展其标距测量范围。将跨度为4 m的T型钢筋混凝土梁等分为8个单元,在每个单元安装标距为500 mm且与中性轴平行的传感器,实现了对梁的整体监测。采用配重小车进行移动加载实验,基于时差定位法的原理分析中心波长时程曲线,以确定小车位置及所处时刻,从而实现了对车速的识别。采用激振器激励,以使梁产生自由振动。利用长标距FBG传感器以及梁顶部布置的压电式加速度计采集梁的动态响应信号,通过频域分析得到频率和振型。结果表明:采用链式阵列方法可以实现频率和振型识别,振型识别阶数与单个传感器的标距长度有关。
Abstract
A long-gauge fiber Bragg grating (FBG) sensing technology is studied, and a chain array method is used to acquire dynamic response of beam. The identification of dynamic parameters of vehicle speed, frequency and vibration mode are realized. A single FBG is applied to pre-stressing, and then encapsulated to form a sensor. The measuring range of gauge is enlarged. A T-shaped reinforced concrete beam with the span of 4 m is equally divided into 8 cells. Sensors with length of 500 mm parallel to the natural axis, and they are independently installed in each cell, which can realize the overall monitoring of beam. The moving load testing is carried out when we use wheeled machine with additional weight. The location and passing time of the wheeled machine are determined when we analyze the time history curve of central wavelength based on the principle of time difference location method, and then the velocity identification is realized. The free vibration of the beam is excited by a vibration exciter. The dynamic response signal is acquired by long-gauge FBG sensors and piezoelectric accelerometers installed on the top of beam. Frequency and vibration mode are obtained by frequency-domain analyzing. The results show that the identification of frequency and vibration mode is achieved by chain array method, and the order of vibration mode identification depends on the gauge length of single sensor.

王大鹏, 庞香润, 田石柱. 基于长标距光纤布拉格光栅阵列动态响应的参数识别[J]. 激光与光电子学进展, 2017, 54(7): 070602. Wang Dapeng, Pang Xiangrun, Tian Shizhu. Parametric Identification of Dynamic Response Based on Long-Gauge Fiber Bragg Grating Arrays[J]. Laser & Optoelectronics Progress, 2017, 54(7): 070602.

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