| 小波域内瞬时频率提取方法研究 |
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| 引用本文： | 张志禹,汪文秉,顾家柳.小波域内瞬时频率提取方法研究[J].西安交通大学学报,2001,35(8):816-819. |
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| 作者姓名： | 张志禹 汪文秉 顾家柳 |
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| 作者单位： | 1. 西安交通大学电子与信息工程学院,
2. 西北工业大学振动工程研究所 |
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| 基金项目： | 国家自然科学基金资助项目(69831020). |
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| 摘 要： | 根据振动信号本身的特征，由小波系数模极大值与小波函数的关系，提出了一种在小波域内提取瞬时频率的方法，这种方法比较适合于频率随时间变化的振动信号，把方法用于由碰摩转子模型生成的振动信号，可得到一条锯齿状的瞬时频率曲线，而用短时Fourier变换对该信号,是不能检测出这样的特征，这证明了该方法在瞬时的提取中是很有效的，对实测碰摩信号获得的瞬时频率也显示了这种方法的有效性，在故障诊断和特征提取中有广阔的应用前景。
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| 关 键 词： | 瞬时频率 小波变换 模级大值 故障诊断 振动信号 |
| 文章编号： | 0253-987(2001)08-0816-04 |
| 修稿时间： | 2000年11月6日 |
Extraction of Instantaneous Frequency in Wavelet Domain |
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| Zhang Zhiyu ,Wang Wenbing ,Gu Jialiu.Extraction of Instantaneous Frequency in Wavelet Domain[J].Journal of Xi'an Jiaotong University,2001,35(8):816-819. |
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| Authors: | Zhang Zhiyu Wang Wenbing Gu Jialiu |
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| Institution: | Zhang Zhiyu 1,Wang Wenbing 1,Gu Jialiu 2 |
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| Abstract: | A new method is presented to extract the instantaneous frequency of vibration signal in wavelet domain.Use is made of the relationship between the maximum of wavelet modulus and the wavelet function.This method is suitable for the signal with time variat spectrum.A jagged curve of instantaneous frequency is obtained when the method is applied to a simulated signal for the rub impact model. This jagged feature can not be detected by the short time Fourier transform. It is proved that the method is very effective for extracting instantaneous frequency. Application of a measured rub impact signal also shows the method has a wide range of application for fault diagnosis and determination of feature of signals. |
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| Keywords: | instantaneous frequency wavelet transform modulus maxima fault diagnosis |
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