基于光纤传感技术的大型船闸人字门形变监测方法研究

Research on Deformation Monitoring Method of Miter Gate of Large Ship Lock Based on Optical Fiber Sensing Technology

摘要:

为实时了解船闸人字门长期满负荷工作可能带来的结构安全问题,提出了一种基于光纤光栅(FBG)传感技术的人字门结构形变在线监测方法。通过对人字门结构进行建模与仿真,弄清门体整体受力分布情况；根据受力分布情况,在人字门上布置若干光纤光栅倾角传感器,实时动态监测门体各部位倾斜角度；将动态倾角变化量转化为结构形变量,建立门体拱度与各点形变量之间的映射关系。结果表明,光纤光栅倾角传感器具有良好的重复性,能够准确反映闸门开、关运行过程；所监测门体最大受力区域为门底枢止水附近,最大拱度在0.1°以内,最大形变量在7mm以内。

Abstract:

In order to solve the structural safety problem that may be brought by the long-term full load work of the miter gates of the ship lock in real time, an on-line deformation monitoring method of herringbone gate based on fiber Bragg grating (FBG) sensing technology is proposed. By modeling and simulating the structure of the miter gate, the stress distribution and the arch collapse of the gate body could be accurately understood. According to the force distribution, several fiber Bragg grating tilt sensors were arranged on the miter gate to dynamically monitor the tilt angle of every part of the gate body in real time. The dynamic change of inclination angle was transformed into structural deformation, and the mapping relationship between arch and deformation is established. The results show that the FBG tilt sensor has good repeatability and can accurately reflect the operation process of gate opening and closing. The maximum stress area of the monitored gate body is near the water seal of the bottom pivot of the gate. The maximum camber is less than 0.1° and the maximum deformation is less than 7mm.