Research On Damage Detection Technology Of Fluid Transportation Pipeline

Fluid transportation pipelines are widely used in various engineering fields.In order to ensure the normal operation of pipelines,strengthen pipeline integrity management and reduce pipeline operation risks,it is necessary to conduct regular damage inspections on in-service pipelines.Pipeline damage inner detection is one of the main methods to achieve pipeline damage detection.The internal detector is driven by the fluid medium transported in the pipeline to run in the pipeline to complete the pipeline damage detection.This paper mainly studies the fluid transportation pipeline damage detection technology,and designs the pipeline detector to realize the detection and location of the pipeline damage.Aiming at the problem of poor detection accuracy in the pipeline,a pipeline detection system based on transient electromagnetic method is designed.According to the characteristics of the fluid transportation pipeline structure,the transient electromagnetic method in-pipe detector system model was established,and the transient electromagnetic probe structure was optimized.The detection accuracy of the instrument was improved by using the eccentric array probe,and it was carried out by COMSOL multiphysics simulation software.By analyzing the frequency spectrum of different waveform signals,designing the bipolar rectangular pulse signal as the excitation signal,analyzing the parameters of the excitation signal,and optimizing the parameters of the excitation signal,the detection speed of the detector in the pipeline can be improved.On this basis,the signal processing module,data storage module and power supply module of the pipeline detector are designed according to the characteristics of the pipeline detector working in a complex environment,which can effectively improve the reliability of the instrument.In addition,in view of the positioning problem of the detector in the pipeline in the field application,a positioning system for the detector in the pipeline is designed.Based on the three-mileage wheel positioning,the system uses an incremental encoder to record the mileage wheel positioning data,designs an incremental encoder signal acquisition system based on FPGA,and proposes a data preprocessing algorithm for the mileage wheel based on Kalman filtering.It can effectively reduce the measurement error caused by noise interference,and the algorithm is verified through simulation experiments,the positioning error of the detector in the pipeline is analyzed,and the in-pipe positioning correction method of multi-sensor data fusion with inertial measurement unit is proposed.It can eliminate the positioning error caused by the influencing factors such as instrument rotation and mileage wheel slippage.At the same time,it can eliminate the accumulated error of positioning by combining the tracking and positioning method outside the pipeline using the ground marker,thereby effectively improving the positioning accuracy of the internal detector on the pipeline damage.Finally,the actual pipeline internal detection experiment is carried out,and the pipeline has been tested by the detector.The experimental results show that the detector based on transient electromagnetic method has better detection performance,and has a high accuracy for the detection and location of pipeline damage,which provides effective support for the subsequent instrument research and improvement.