Research on Indicator Diagram Fault Diagnosis Based on Fourier Description of Torque Characteristics
FU Guang-ji · Huagong zidonghua ji yibiao · 2015
An indicator diagram fault diagnosis method which having torque characteristics and Fourier description combined was proposed. Through optimal threshold segmentation and edge detection,the image of boundary with the largest filling area can be obtained; through calculating the image's torque characteristics,the torque characteristic sequence of the object shape can be reached; through discrete Fourier transform,the normalized torque characteristics' Fourier description which boasting of features like translation,rotation and scale invariant was obtained and the fault types were classified by Euclidean geometrical distance method. Practical application proves the proposed method's feasibility and effectiveness in diagnosing pumping unit's fault.