基于复电容模型的发动机滑油磨粒检测蜂窝状电容传感器

Honeycomb Capacitance Sensor for Engine Sliding Oil Abrasive Grain Detection Based on Complex Capacitance Modeling

航空发动机内部产生的异常颗粒反映零部件健康状况,同时滑油品质也直接影响零部件健康。为了提升传感器的检测灵敏度,同时考虑介质的电导率,降低加工难度,设计了一种基于复电容模型的蜂窝状电容传感器。传感器利用3块圆形电极板分割灵敏场,采用差分结构与交流电桥,放大检测信号。电极板内部为网状,圆孔呈正六边形分布。基于物理场仿真,运用控制变量法分析滑油品质、结构参数、磨粒特征与复电容值的关系。在外径10 mm、内径8 mm的管道中,可检测38μm铁磨粒、60μm铝磨粒和水气颗粒、155μm的硅灰石颗粒,能够有效分析滑油品质,区分磨粒尺寸和材质。

The abnormal particles produced inside the aero-engine reflect the health of the components,while the quality of the sliding oil also directly affects the health of the components.In order to improve the detection sensitivity of the sensor,while considering the conductivity of the medium and reducing the processing difficulty,a honeycomb capacitance sensor based on the complex capacitance model was designed.The sensor utilized three circular electrode plates to divide the sensitive field,and adopted a differential structure with an AC bridge to amplify the detection signal.The interior of the electrode plates was in the form of a mesh,and the circular holes were distributed in a positive hexagonal shape.Based on the physical field simulation,the control variable method was used to analyze the relationship between the slippery oil quality,structural parameters,abrasive grain characteristics and the complex capacitance value.In a pipe with an outer diameter of 10 mm and an inner diameter of 8 mm,38μm iron abrasive particles,60μm aluminum abrasive particles and moisture particles,and 155μm wollastonite particles can be detected,which can effectively analyze the quality of the slippery oil,and differentiate between abrasive particle size and material.