单轴定位磁标识清管器方法研究

Method of locating pig labeled with magnets based on uniaxial sensor

为得到单轴磁传感器在磁源标识清管器定位中的最佳探测姿态,采用数值模拟的方法,对直管和弯管进行建模分析,取清管器正上方测面处的多个测点,分别研究各测点在空间多个方向上的磁场波动值,通过比较波动值大小即可得到最佳的探测方向。根据实际管道铺设方式的不同,对水平走向管道进行分析,得知当清管器通过探测点时,垂直于管道轴线方向的磁波动分量值最大,该波动值可被单轴传感器有效检测。采用管道倾角θ及管道偏角γ这2个变量来描述弯折管道,结果表明,在与管道相垂直的方向上磁波动分量值最大,并且综合倾角与偏角均存在的情况,单轴传感器也应垂直于管道安装。进行了相关的等效实验,验证了数值模拟结果的正确性。由此可得,探测时单轴磁传感器测量方向应垂直于管道轴线方向。

In order to obtain the optimal attitude of uniaxial magnetic sensor in the location of pig labeled with magnets,numerical simulation is adopted to carry out modeling analysis of the horizontal pipe and the bent pipe,take a series of measuring points at the measuring surface directly above the pig and study the magnetic fluctuation values of each measuring point in multiple directions.The best detecting direction can be obtained by comparing the fluctuation value.According to the difference laying mode of the actual pipeline,the horizontal pipeline is analyzed firstly,and it is found that when the pig passed the measuring point,the fluctuation Perpendicular to the pipeline axis is the largest to be effectively detected by the uniaxial magnetic sensor.Then two variables,pipeline inclination and pipeline deflection are used to describe the bent pipeline,the results indicates that the largest fluctuation is in the direction perpendicular to the pipe.And the existence of both inclination and declination proves that the uniaxial sensor should also be installed perpendicular to the pipeline.Finally,relevant equivalent experiments are carried out to verify the numerical simulation results.So the conclusion is that:the measurement direction of the uniaxial magnetic sensor should be perpendicular to the direction of the pipeline during the detection.