摘要
光纤传感技术与传统的电类、机械类传感技术相比,具有抗电磁干扰能力强、使用方便、易维护等优点。本文探讨其应用于钢轨变形监测的可行性。首先,将两相邻弹性扣件之间钢轨受力形式简化为简支梁,通过理论分析得出钢轨中间点断面同一高度处应变与位移之间的关系;然后将分布式光纤和光栅传感器布设在钢轨简支梁上,通过试验测试数据得到位移与应变的关系,并分析了由应变推算钢轨变形的计算误差。研究结果表明:光纤传感技术在钢轨变形监测上是可行的;光栅传感器测量精度较分布式光纤精度高。研究结果为光纤传感技术在钢轨变形监测中的应用提供了技术支撑。
Compared with the traditional electrical and mechanical sensing technology,optical fiber sensing technology has the advantages of strong anti electromagnetic interference ability,easy use and convenient maintenance. In this paper,its feasibility applied in rail deformation monitoring was discussed. The rail stress form between two adjacent elastic fastenings can be simplified as a simply supported beam and the relation between displacement and strain in the same height position of simply supported rail middle section is concluded by theoretical analysis,by setting the distributed optical fiber and grating sensors on the rail simply supported beam the relation between displacement and strain is obtained by test data and the calculation error of rail deformation deduced by strain is analyzed. The research results showed that the fiber sensing technology is feasible for rail deformation monitoring and grating sensor measurement accuracy is higher than distributed optical fiber precision,which could provide a technical support for optical fiber sensing technology applied in rail deformation monitoring.
出处
《铁道建筑》
北大核心
2015年第3期122-125,共4页
Railway Engineering
基金
中国铁道科学研究院院基金(SZY201205)
关键词
经典钢轨力学
简支模型
光纤传感技术
钢轨变形监测
Classical rail mechanics
Simply supported model
Optical fiber sensing technology
Rail deformation monitoring
