用于滑油中碎屑在线监测的电容传感器设计与实现

摘要

设计了可集成于滑油管道的同轴电容传感器,可用于原位检测滑油中碎屑从而诊断航空发动机健康状态.建立同轴电容传感器的数学模型,采用数值仿真方法对电容传感器相关参数进行分析.结果表明:圆筒式电容传感器的电容值随碎屑数量的增加而增大,且大致呈现线性关系,随碎屑尺寸的增加而增大,且有较好的线性关系.确定合适的传感器设计参数,搭建试验台对同轴电容传感器进行初步实验验证,试验结果表明同轴电容传感器具有可行性.%A cylindrical capacitive sensor was developed,which has the advantages of high resolution,small size and designability,and can be easily installed on lubricant pipeline to monitor the debris in lubricant of aircraft engine.A theoretical model of the cylindrical capacitive sensor was set up to analyze several parameters' effectiveness on the performance of sensor,including the cross sectional area of the sensor,the distance between two poles and the permittivity.It is shown that the capacitance value of the sensor is increased with the increase of the debris number,as well with the increase of debris size;there are approximately linear relations for above two cases.Numerical simulations were conducted to determine the optimal parameters for preliminary experiments.Experiments were carried out to demonstrate the feasibility of the developed capacitive sensors.