基于小波分析的超声波测量油膜厚度方法

Ultrasonic method of measuring oil film thickness based on wavelet analysis

润滑对机械设备的正常运转及维护保养起重要作用。测量润滑油膜厚度能有效评价机械润滑效果,在实际应用中起到非常重要的作用。对驱动装置和电路原理进行设计与实现,并对喷油泵柱塞油膜采用超声波测量技术进行静、动工作状态的厚度测量,利用小波理论对油膜反射信号降噪处理,通过弹簧模型理论和反射系数对超声波信号分析与处理,计算得到油膜厚度测量值,对降噪前后的两种工作状态下的测量结果进行对比分析,验证了超声波测量技术的准确性和小波降噪理论对提高测量结果精度的有效性。

Lubrication plays an important role in the normal operation and maintenance of machinery and equipment.The measurement of lubricant film thickness can effectively evaluate the effect of mechanical lubrication and plays a very important role in practical applications.The test is designed and implemented through the drive device and circuit principle,and the thickness measurement of the plunger oil film of the injection pump is carried out under two working conditions,static and dynamic.By using wavelet theory for noise reduction of the oil film reflection signal,the ultrasonic signal is analyzed and processed through the spring model theory and reflection coefficient to calculate the oil film thickness measurement value.By comparing and analyzing the measurement results under two working states before and after noise reduction,the accuracy of ultrasonic measurement technology and effectiveness of wavelet noise reduction theory to improve the accuracy of measurement results are verified.