A Synchronous Sensing Method of Measuring Lubricating Oil Film Thickness and Temperature by Using Eddy Current Effect

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Xiuqi Yuan, Hongkai Li, Tong Zhang, Zihan Li, Shaohua Zhang
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引用次数: 0

Abstract

The eddy current method can be well applied in the lubricating oil film thickness measurement, due to its excellent performance, such as high-precision, non-destructive and strong environmental adaptability in situ. Generally, the temperature variation would cause a failure of the lubricating oil, therefore it is necessary to detect synchronously the oil film temperature for controlling an effective lubrication state, meanwhile it also affects the measurement performance of an eddy current sensor. In this study, a high-precision detection method of measuring the thickness and temperature of lubricating oil film by using the eddy current effect is proposed. Firstly, an oil film thickness detection model with an eddy current coil is established by coupling electromagnetic field and temperature field, and the effect of temperature variation on film thickness measurement is revealed. It is found that the coil inductance and film thickness have a good linear relationship within a certain range, so do the coil resistance and temperature. Then, a signal conversion module of detection circuit is designed, and a decoupling algorithm on extracting the two characteristic components (thickness and temperature) is proposed by separating the real and imaginary parts of the output voltage. Finally, according to a series of calculation and analysis, the fitting relationship between the real and imaginary parts of voltage and the temperature and thickness of oil film is established, which improves film thickness measurement accuracy and temperature stability, meanwhile achieve a synchronous sensing of oil film thickness and temperature.

Graphical Abstract

Abstract Image

Abstract Image

利用涡流效应测量润滑油膜厚度和温度的同步传感方法
电涡流法因其高精度、无损伤、现场环境适应性强等优异性能,在润滑油膜厚度测量中得到了很好的应用。一般来说,温度变化会导致润滑油失效,因此需要同步检测油膜温度以控制有效的润滑状态,同时这也会影响电涡流传感器的测量性能。本研究提出了一种利用涡流效应测量润滑油膜厚度和温度的高精度检测方法。首先,通过耦合电磁场和温度场,建立了一个带有涡流线圈的油膜厚度检测模型,并揭示了温度变化对油膜厚度测量的影响。研究发现,线圈电感与油膜厚度在一定范围内有良好的线性关系,线圈电阻与温度也有良好的线性关系。然后,设计了检测电路的信号转换模块,并通过分离输出电压的实部和虚部,提出了提取两个特征分量(厚度和温度)的解耦算法。最后,通过一系列计算和分析,建立了电压实部和虚部与油膜温度和厚度的拟合关系,提高了油膜厚度测量精度和温度稳定性,同时实现了油膜厚度和温度的同步传感。
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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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