| 一种改进的谐波小波及其在转子故障诊断中的应用 |
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| 引用本文： | 陈果.一种改进的谐波小波及其在转子故障诊断中的应用[J].机械工程学报,2011,47(1). |
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| 作者姓名： | 陈果 |
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| 作者单位： | 南京航空航天大学民航学院,南京,210016 |
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| 基金项目： | 国家自然科学基金(50705042); 航空科学基金(2007ZB52022)资助项目 |
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| 摘 要： | 在Newland谐波小波的基础上,提出一种改进的谐波小波,该改进的谐波小波具有对称的盒形频谱,其伸缩和平移生成的小波族构成L2(R)空间的正交基,在保持Newland谐波小波的优良性质基础上,信号分解与重构更为简单。利用仿真算例研究改进的谐波小波对微弱局部信号及强噪声背景下的有用信号提取能力,并与DB8小波分析进行比较,结果表明,改进的谐波小波具有更好的信号提取效果。针对转子故障信号特征频率通常为转速频率的分数及整数倍特点,采用该改进的谐波小波提取转子故障信号中的倍频分量,利用实测的不平衡、不对中、碰摩及油膜涡动四种转子故障试验数据,提取了故障信号中的0.5、1.0、1.5、2.0、2.5、3.0、3.5、4.0、4.5及5.0等倍频分量,结果验证了方法的有效性。
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| 关 键 词： | 谐波小波 信号分解与重构 转子 故障诊断 |
An Improved Harmonic Wavelet and Its Application to Rotor Faults Diagnosis |
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| CHEN Guo.An Improved Harmonic Wavelet and Its Application to Rotor Faults Diagnosis[J].Chinese Journal of Mechanical Engineering,2011,47(1). |
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| Authors: | CHEN Guo |
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| Affiliation: | CHEN Guo(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016) |
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| Abstract: | On the basis of Newland harmonic wavelet,an improved harmonic wavelet is put forward,it has a symmetrical and boxy frequency spectrum,and its expansions and translations will generate a series of wavelet functions which form an orthogonal basis of L2(R) space,the decomposition and reconstitution process of signal by the improved harmonic wavelet is easier than that by the Newland harmonic wavelet,moreover,the improved harmonic wavelet has the same excellent characteristics as the Newland harmonic wavelet.Us... |
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| Keywords: | Harmonic wavelet Signal decomposition and reconstitution Rotor Fault diagnosis |
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