滑油系统全流量磨粒在线监测静电传感技术研究
收稿日期: 2012-10-15
修回日期: 2012-12-25
网络出版日期: 2013-01-05
基金资助
国家自然科学基金与中国民航联合基金重点项目(60939003)
Research on Electrostatic Sensing for In-line Abrasive Monitoring in Full Flow Oil System
Received date: 2012-10-15
Revised date: 2012-12-25
Online published: 2013-01-05
Supported by
Grant from National Natural Science Foundation of China and Civil Aviation Administration of China(60939003)
在滑油系统全流量磨粒在线静电监测中,针对缺乏与实际物理模型相一致的数学模型以及深入地分析,建立了较准确的数学模型。对信号采集电路的分析表明:带不同极性电荷的磨粒经过静电感应区域时输出的感应电压变化不同,从而确定带电磨粒的极性。同时,引入空间灵敏度概念,对带电磨粒的位置、传感器的轴向长度与径向半径3个影响因素分别进行了研究,所得空间灵敏度曲线彼此印证,进而说明了所建数学模型的准确性。为了证实所建立的数学模型与实际的滑油系统全流量磨粒在线监测数据的一致性,设计了仿真监测试验平台,试验结果表明,虽然监测到的静电感应信号夹杂着噪声,但与理论分析的理想电压输出相似,并且可以判断磨粒所带电荷的极性。
黄文杰 , 左洪福 . 滑油系统全流量磨粒在线监测静电传感技术研究[J]. 航空学报, 2013 , 34(8) : 1786 -1794 . DOI: 10.7527/S1000-6893.2013.0316
In view of the absence of a mathematical model consistent with the physical model and of an in-depth analysis in the research on in-line abrasive electrostatic monitoring in the full flow oil system of an aero-engine, this paper proposes a mathematically more precise model. An analysis of the signal acquisition circuit indicates that the output of the induced voltage varies with the debris which carries different electric charges while passing through the electrostatic sensing area, and the polarity of the charge carried is ascertained consequently. Meanwhile, a study is conducted of the three factors influencing the spatial sensitivity: the position of the charged abrasive, the axial length and the radial radius of the transducer. The curves of spatial sensitivity obtained show good agreement, which demonstrates that the mathematical model is built accurately. To prove the consistency of the mathematical model with the data acquired during the abrasive monitoring process in the actual full flow oil system, an imitative monitoring platform is designed and the experimental result showes that the monitored signal induced by the electrostatic system is similar to the voltage output in the theoretical analysis and the abrasive polarity can be judged as well, though the signal is coupled with noise.
Key words： aero-engine; oil system; in-line monitoring; mathematical model; spatial sensitivity
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