| 平稳噪声背景下周期信号基频初相位检测 |
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| 引用本文： | 余建航. 平稳噪声背景下周期信号基频初相位检测[J]. 振动、测试与诊断, 1999, 19(1): 26-29 |
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| 作者姓名： | 余建航 |
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| 作者单位： | 南京航空航天大学振动工程研究所 |
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| 摘 要： | 给出了采用Ｍｏｒｌｅｔ小波变换并结合集合平均检测叠加有平稳随机噪声周期信号基频初相位的方法，为旋转机械故障定位提供新手段。数字仿真结果及实例表明，即使信噪比很小的，本方法仍能得到较好结果。
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| 关 键 词： | 小波变换 相位检测 集合平均 随机噪声 |
Detection of Initial Phase of Fundamental Frequency Component of a Periodic Signal Mixed with Stationary Noise |
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| Yu Jianhang Zhang Zengchang. Detection of Initial Phase of Fundamental Frequency Component of a Periodic Signal Mixed with Stationary Noise[J]. Journal of Vibration,Measurement & Diagnosis, 1999, 19(1): 26-29 |
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| Authors: | Yu Jianhang Zhang Zengchang |
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| Abstract: | A new method for detecting the initial phase of the fundamental frequency component of a periodic signal mixed with stationary random noise by using the Morlet wavelet transform and ensemble average is presented,which provides a more effective means for the fault location in rotary machinery.Digital simulation and a practical example show that a result with considerable accuracy can still be obtained,even if the signal to noise ratio is very low. |
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| Keywords: | wavelet transform phase detection ensemble average random noise |
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