Calculation Method Of Pipeline Magnetic Flux Leakage Based On Circumferential Excitation

This article in view of the oil pipeline application traditional magnetic flux leakage examination technology is unable to examine the axial guidance flaw, studied the circumferential excitation leakage examination technology. In view of the oil pipeline circumferential excitation leakage flaw examination's related difficult problem, the close union actual project examination's need, through the fundamental research, the entity modeling simulation analysis and the project experiment, has carried on systematically the analysis to the oil pipeline circumferential leakage examination technology and studies thoroughly.This article has studied the circumferential excitation examination principle, the utilization magnetic circuit computation theory, carries on mathematics modeling to the circumferential excitation leakage detector's magnetization festival, infers the circumferential excitation leakage detector's magnetic circuit computation equation, has designed the magnetic circuit computation software, completed has conformed to the circumferential excitation leakage detector's magnetization festival design which the actual project needed; Take the leakage examination's finite element analysis method as a foundation, utilizes ANSYS the finite element software the defective area stray field to carry on the modeling simulation analysis to the oil pipeline under the circumferential excitation way, through the finite element simulation analysis circumferential excitation way under the defective area leakage signal's characteristic, has studied in the pipeline the flaw contour characteristic (axial length, circumferential width as well as depth), the sensor raises to the value as well as the permanent magnet parameter to the flaw leakage signal influence. Through carries on the simulation analysis using the ANSYS simulation analysis software to the test whole flaw, confirmed the circumferential excitation way leakage detector set magnetization festival to be possible to pick out the nature to the flaw. The experiment uses the Hall sensor to take the circumferential excitation leakage pipeline flaw examination the leakage signal sensor, through the data acquisition card gathering magnetic leakage signal data, takes the experimental subject by 426 pipelines, carried in the flaw pipeline pulls the experiment, under the experimental verification circumferential excitation way the flaw leakage examination feasibility.The topic proposed under the circumferential excitation way the flaw leakage detector set magnetization festival's design, solved domestic carried on when the pipeline leakage examination has been unable the examination axial guidance flaw difficult problem, through the computer simulation verification circumferential excitation way the pipeline flaw leakage examination's feasibility, detector set's research and development has provided the technical support for the circumferential excitation leakage.