摘要
幅值调制现象是一种常见的机械故障现象.传统的分析方法有时域分析法和功率谱分析方法.这两种方法均具有对噪声敏感的缺点.本文在分析幅值调制信号模型和高阶统计量的基础上,提出了一种改进的双谱计算方法.理论及仿真分析结果表明,它对于幅值调制信号的分析,是颇为有效的.
Amplitude Modulated signal is a common signal of mechanical fault. There are two conventional methods. They are time domain analysis method and power spectrum analysis method. Both the two methods are sensitive to noise. Based on the analysis of the model of amplitude modulated signal and higher order statistics, one modified calculation method of bispectrum is prompted. By theoretical analysis and simulation result, this method is good to analyse the amplitude modulated signal.
出处
《振动.测试与诊断》
EI
CSCD
1993年第4期26-30,共5页
Journal of Vibration,Measurement & Diagnosis
关键词
幅值调制
双谱
调制频率
载波频率
Amplitude modulation, Bispectrum, Modulation frequency, Carrier-frequency