方位(导航)
振动
二元分析
循环平稳过程
断层(地质)
自相关
连贯性(哲学赌博策略)
信号(编程语言)
计算机科学
声学
算法
工程类
结构工程
数学
物理
人工智能
统计
电信
地震学
地质学
频道(广播)
机器学习
程序设计语言
作者
Yao Cheng,Bingyan Chen,Weihua Zhang
出处
期刊:Measurement
[Elsevier]
日期:2022-01-01
卷期号:188: 110418-110418
被引量:8
标识
DOI:10.1016/j.measurement.2021.110418
摘要
Spectral coherence (SCoh) is one of the most dedicated methods for characterizing the second-order cyclostationarity of bearing faults. Under the assumption of second-order cyclostationarity, the SCoh of the bearing vibration signal is expected to have non-zero values along lines–determined by fault-related cyclic frequencies. However, the bearing vibration signal produced by a complex mechanical system always exhibits mixed cyclostationarity–a combination of several orders of cyclostationarity, rather than pure second-order cyclostationarity. The fault-unrelated cyclic frequencies exhibiting a series of non-zero elements on the bivariate plane are served as a tricky problem to interfere with the fault identification. To address this issue, an enhanced SCoh is proposed by combining two basic operators designed by using median filtering and autocorrelation, respectively. Analysis of simulated signals, vibration datasets obtained from artificial fault bearing experiments, and accelerated bearing degradation tests are conducted to verify and compare the performance of the improved SCoh.
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