基于循环统计理论, 对循环平稳信号进行处理, 主要研究了信号的二阶循环统计特性, 即循环自相关函数和循环谱密度, 指出循环自相关函数不为零的循环频率对应着信号中的某些故障, 并
可以对调幅信号进行解调. 通过循环频率扫描方法提取的调制源分布在循环频率域的低频段, 其结
果可用循环频率-频率- 循环谱密度的三维图表示. 用仿真信号对该方法进行验证, 并应用于滚动轴承的内、外圈及滚动体的故障诊断, 可以有效地分离出所对应的故障特征频率.
Statistical theory based on the cycle of cyclostationary signal processing, mainly studied the statistical properties of the signal of second cycle, ie cyclic autocorrelation function and cyclic spectral density, noting that cyclic autocorrelation function is not zero cycle frequency corresponds to a certain signal These faults, and can be demodulated AM signal through cyclic frequency scanning method to extract the modulation source distributed in the frequency domain of the low frequency cycle, the results can be cyclic frequency- Frequency- loop spectral density of the three-dimensional graph. using simulated signals right This method is validated and used rolling bearing, the outer ring and rolling fault diagnosis can be effectively isolated from the corresponding fault characteristic frequency. (2013-08-15, PDF, 166KB, 下载60次)