基于STFT的缝翼滑轨故障静电监测技术的研究

Study on electrostatic monitoring of slat rail based on STFT

针对飞机缝翼运动机构需要实时监测的要求,提出了一种新的能够提前预警故障的方法,即基于静电感应的状态监测方法。分析了静电监测的原理,并通过模拟实验对该方法进行了初步的研究。实验结果表明:静电传感器能够有效地监测到故障的静电荷水平变化,验证了此传感器用于缝翼滑轨模拟试验件监测的有效性。介绍了短时傅里叶变换(STFT)时频分析原理,利用STFT对数据进行处理,分析其特性,为进一步研究机载化缝翼滑轨的静电监测设备提供了一定的依据。

Aiming at the demend for real time monitoring of aircraft slat rail, a new method which based on electrostatic induction of condition monitoring method of early warning of fault is proposed. The foundational principle of electrostatic monitoring method is analyzed, the preliminary experiment research on electrostatic monitoring method is carried out. The result of the experiment shows that the electrostatic sensor can effectively detect changes in the electrostatic charge level due to fault, indicating availability of the application of electrostatic in the model of slat rail. The theory of short-time Fourier transform（STFT） is introduced. STFT is used to process the data, and its characteristics is analyzed. It provides a further research of airborne slat rail monitoring equipment.