管道周向二维振动线阵视觉条纹同步测量

Simultaneous Measurement of Pipeline Circumferential 2D Vibration Based on Linear Array Vision-sensitive Fringe Pattern

针对管道振动监测问题,提出基于线阵相机的管道周向二维振动同步测量方法。在待测管道圆周表面预置单密度正弦条纹,采用线阵相机作为监测器对管道表面条纹图案进行实时采集,利用时频分析方法对采集的条纹进行处理以提取条纹序列的密度变化曲线,再通过条纹密度曲线的对称中心变化及其密度值的变化计算管道周向二维振动位移。首先利用SolidWorks软件建立管道振动测量模型,通过软件视觉成像模块对管道的预设振动进行模拟测量,再对视觉测量系统的影响因素进行模拟分析,最后搭建实验测量系统并与电涡流传感器测量系统的测量结果进行对比。模拟和实验结果表明,提出的测量方法可高效地实现10 mm范围内管道周向二维振动的准确同步测量,位移测量精度优于10μm。

A pipe circumferential two-dimensional(2D)vibration measurement method based on linear array camera was proposed to realize the vibration monitoring of piping system.The linear array camera was employed to capture the intensity of the sinusoidal fringe pattern preset in the circumferential surface of the pipe.Time-frequency analysis method was employed to obtain the fringe density curve from the captured fringe intensity signal.Pipe 2D vibration displacement was calculated from the variation of the symmetric center coordinate of the fringe density curves and its fringe density values.Pipeline vibration measurement model was established using SolidWorks software.Simulation measurement for known vibrations was firstly carried out using the image module.Influencing factors of the measurement system were also analyzed through simulations.Finally,experimental setup was developed,and the results obtained by the proposed system were compared with the results obtained by eddy current measurement system.The simulated and experimental results show that the proposed measurement method can efficiently realize synchronous and accurate measurement of circumferential two-dimensional vibration of pipelines with a resolution better than 10μm.