| DIESEL ENGINES‘ VIBROACOUSTIC SIGNATURE EXTRACTION BY WAVELET PACKET TECHNIQUE |
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| 引用本文： | 邹剑,陈进,邹军,耿遵敏.DIESEL ENGINES‘ VIBROACOUSTIC SIGNATURE EXTRACTION BY WAVELET PACKET TECHNIQUE[J].上海交通大学学报(英文版),2002,7(1):95-99. |
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| 作者姓名： | 邹剑 陈进 邹军 耿遵敏 |
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| 作者单位： | 1.State Key Lab. of Vibration，Shock & Noise，Shanghai Jiaotong Univ.，Shanghai 200030，China; 2.Longkou Institute of Architecture Design，Longkou 265700 |
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| 基金项目： | National Natural Science Foundation ofChina (No.5 9775 0 2 4 |
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| 摘 要： | IntroductionResearches on fault diagnosis and conditionmonitoring in reciprocating machine are being paidmore and more attentions because of its importancein industrial branches such as power,transporta-tion,shipping,petrochemicals etc. From themechanism viewpoint,diesel engines'working pro-cess is a thermodynamic process to realize the ther-mal- mechanical energy conversion.Low frequencycompression wave and high frequency combustionwave constitute the multifrequency time- varyingproperty of i…
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DIESEL ENGINES' VIBROACOUSTIC SIGNATURE EXTRACTION BY WAVELET PACKET TECHNIQUE |
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| ZOU Jian ,CHEN Jin ,ZOU Jun ,GENG Zun min.DIESEL ENGINES'' VIBROACOUSTIC SIGNATURE EXTRACTION BY WAVELET PACKET TECHNIQUE[J].Journal of Shanghai Jiaotong university,2002,7(1):95-99. |
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| Authors: | ZOU Jian CHEN Jin ZOU Jun GENG Zun min |
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| Institution: | 1. State Key Lab. of Vibration, Shock & Noise, Shanghai Jiaotong Univ., Shanghai 200030, China
2. Longkou Institute of Architecture Design, Longkou 265700 |
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| Abstract: | Multisource unstable impulsive excitations, time varying transmission path, concentrated mode, dispersion and reverberation that are important characteristics of reciprocating machines such as diesel engines result in wide band non stationary vibroacoustic responses which influence the effective extraction of vibroacoustic signatures and become a key factor to limit diesel engines' vibration diagnosis. In this paper, a serial theoretical deduction on the unstable dynamic properties of diesel engines was made; the mechanism of non stationary vibroacoustic responses was elucidated. Based upon that, the wavelet packet technique was introduced. The reason for the existence of frequency aliasing in the Paley series from wavelet packets' decomposition was analyzed, and the wavelet packet frequency shifting algorithm was given. Experiments on 190 serial diesel engines verify the given method's significant validity in vibroacoustic signature extraction and reciprocating machines' vibration diagnosis. |
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| Keywords: | vibroacoustic signatures wavelet packets reverberation dispersion |
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