幅值调制信号的双谱分析法  

The Analysis of Amplitude Modulated Signal by Bispectrum

作　　者：吴余华 孙月明[1] 陆乃炎 童忠钫[1] 

机构地区：[1]浙江大学机械系,杭州310027

出　　处：《振动．测试与诊断》1993年第4期26-30,共5页Journal of Vibration,Measurement & Diagnosis

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.

关 键 词：幅值调制 双谱 调制频率 载波频率 

分 类 号：TH113.1[机械工程—机械设计及理论]