循环平稳度解调频原理分析及其在齿轮故障诊断中的应用  

Frequency Demodulation Analysis of Degree of Cylcostationary and Its Application to Gear Defect Detection

作　　者：何俊[1] 陈进[1] 毕果[1] 周福昌[1] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室

出　　处：《上海交通大学学报》2007年第11期1862-1866,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50175068);国家自然科学基金重点资助项目(50335030)

摘　　要：为了克服Hilbert变换解调频法容易受到端点效应、采样频率和噪声的影响而出现不稳定现象的缺点,提出了利用循环平稳度对调频信号进行解调分析的新方法.基于调频信号的谐波分解,对调频信号的循环自相关和循环平稳度函数进行了详细地推导.研究结果表明,循环平稳度不仅能够有效地对调频信号进行解调,而且还对加性平稳噪声具有较强的抑制能力,因此,基于循环平稳度的解调频方法将大大地提高分析结果的准确性.In order to overcome the shortcoming of Hilbert transformation that will be influenced by many factors, such as end effect, sampling frequency and the added noise in signal, a new method by using the degree of cyclostationarity （DCS） was proposed to FM demodulation. Based on the harmonic expansion of FM signal, its cyclic autocorrelation function and DCS were deduced. The research results show that the DCS can not only demodulate FM signal but also cancel the added noise in the signal. Therefore more obvious default features will be detected through this new method.

关 键 词：齿轮 故障诊断 解调频 调频信号 循环平稳 循环平稳度 

分 类 号：TN911.72[电子电信—通信与信息系统] TP206[电子电信—信息与通信工程]