基于光纤陀螺的有轨钢构桥梁形变检测方法

Research on Rail Steel Structure of Bridge Deformation Monitoring Based on Fiber Optic Gyroscope

摘要:

针对现有光纤陀螺桥梁形变检测方法无法消除检测小车偏航带来的路径偏差,提出了基于光纤陀螺的有轨钢构桥梁形变检测方法。首先,阐述了光纤陀螺测量桥梁线形的原理与系统架构；然后,通过有限元对有轨条件下的钢构进行分析,设置不同温度梯度,验证得到轨道受热力耦合作用产生的形变与温度之间呈线形关系,构建了轨道与温度的误差模型；最后,通过搭建试验环境,测试轨道线形与轨道在不同温度下的形变结果,验证了该方法的有效性。实验结果表明:有轨钢构桥梁形变与外界环境温度之间的关系为1~2mm/10℃,为后续实际桥梁形变测量提供了温度误差校准模型；基于光纤陀螺的有轨钢构桥梁形变检测精度优于2mm。

Abstract:

For the existing bridge deformation detection methods based on fiber optic gyroscope (FOG) cannot eliminate the path deviation caused by the yaw of the detection trolley, a deformation detection method of rail steel bridge based on FOG was proposed. Firstly, the principle and system architecture of FOG measurement of bridge alignment were explained. Then the steel structure under rail condition was analyzed by finite element method. By setting different temperature gradients, it was verified that the deformation of the rail was linear with the temperature, and the error model of rail and temperature was established. Finally, the validity of the method was verified by setting up the test environment to test the rail alignment and the rail deformation at different temperatures. The experimental results show that the relationship between the deformation of rail steel bridge and the ambient temperature is 1~2mm/10℃, which provides a temperature error calibration model for subsequent actual bridge deformation measurement. The precision of deformation detection of rail steel bridge based on FOG is better than 2mm.