基于Shannon熵与声发射信号的CBN砂轮性能监测方法研究  

RESEARCH ON CBN GRINDING WHEEL PERFORMANCE MONITORING METHOD BASED ON SHANNON ENTROPY AND ACOUSTIC EMISSION SIGNAL

作　　者：谭永敏 施展[1] 迟玉伦 顾佳健 TAN YongMin;SHI Zhan;CHI YuLun;GU JiaJian(School of Optical-Electrical and Computer Engineering,University of Shanghai for S&T,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《机械强度》2023年第2期321-330,共10页Journal of Mechanical Strength

基　　金：上海市科学技术委员会项目(N17DZ2283300)资助。

摘　　要：为了在磨削加工过程中能够有效判别CBN(Cubic Boron Nitride)砂轮的磨削性能,提出了一种基于Shannon熵理论与声发射信号的CBN砂轮性能监测方法。首先,利用声发射传感器采集CBN砂轮磨削加工过程中的声发射信号,基于最大信息熵对CBN砂轮磨削加工过程中的声发射信号进行概率密度估计,获得磨削加工过程中声发射信号的最大熵概率密度分布。然后,通过分析研究CBN砂轮在修整过后循环磨削以及不同直径剩余磨削时的声发射信号特征,根据交叉熵原理分析CBN砂轮不同磨削性能时声发射信号最大熵概率密度分布,并通过设定交叉熵阈值来辨别磨削加工过程中CBN砂轮的磨削性能。最后,为验证该方法的实用性,在某工厂CBN砂轮磨削产品生产线上进行大量实验研究,结果表明,该方法对CBN砂轮磨损状态及CBN砂轮剩余寿命进行有效监测,验证了该方法监测CBN砂轮在磨削加工过程中磨削性能的有效性。In order to effectively evaluate the grinding performance of CBN(Cubic Boron Nitride) grinding wheel in the grinding process,a monitoring method of CBN grinding wheel performance was proposed based on Shannon entropy theory and acoustic emission signal.Firstly,the acoustic emission signal of CBN grinding wheel was collected by an acoustic emission sensor.Then,the probability density and distribution of acoustic emission signal of CBN grinding wheel was estimated by using the maximum information entropy.In addition,the characteristics of acoustic emission signals of CBN grinding wheel during cyclic grinding after dressing and residual grinding with different diameters were analyzed and discussed.Subsequently,the relationship between the maximum entropy probability density distribution of acoustic emission signals and the different grinding performance of CBN grinding wheel was established according to the cross entropy principle.Finally,a large number of experiments verified the availability above mentioned estimation method.The CBN grinding wheel wear status and the remaining life of CBN grinding wheel can be monitored.

关 键 词：CBN砂轮磨削性能 声发射信号 Shannon熵 最大信息熵 交叉熵 

分 类 号：TH161[机械工程—机械制造及自动化]