基于异构线圈电磁传感器的滑油磨粒检测方法OA

To address the issue of detection accuracy in electromagnetic-based debris sensors for lubricating debris monitoring in aviation engine being affected by the uniformity of the internal magnetic field,a novel heterogeneous electromagnetic sensor composed of multiple external excitation coils and an internal sensing coil was proposed.Theoretical and finite element models of the heterogeneous coil sensor were established.The distribution characteristics of the internal magnetic field were investigated,under the same conditions,the magnitude of the magnetic field variation in the detection area of the heterogeneous coil was only 19.25%of that in a traditional three-coil structure,with a uniformity area exceeding 87.46%at a uniformity level better than 1%.Experimental verified that the deviation in detection voltage values for iron and copper wear particles of the same size passing through different radial positions was within 3.95%and 4.67%,respectively,corresponding to equivalent diameter recognition errors of 1.30%and 1.53%of the actual particle diameter.The relative uncertainty σ of the induced signals when debris passed the sensor along different paths was less than 3.6%.The uniformity η of the detection signals for iron and copper particles was less than 0.043 8 and 0.057 5,respectively.The detection linearity for iron debris of 250-600 µm and copper debris of 450-900 µm was found to be 4.27%and 6.89%respectively.The results indicated that the proposed new heterogeneous electromagnetic sensor can provide engineering support for the development of a high-precision online monitoring system for abrasive debris in aircraft engine lubricants.