| 基于短时AR谱分析的柴油机气阀漏气的故障诊断 |
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| 引用本文： | 李涛,李艾华,吴朝军,吴育峰.基于短时AR谱分析的柴油机气阀漏气的故障诊断[J].机电设备,2007,24(3):12-14. |
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| 作者姓名： | 李涛 李艾华 吴朝军 吴育峰 |
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| 作者单位： | 第二炮兵工程学院,研究生一队,西安,710025 |
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| 摘 要： | 通过对传统的短时Fourier变换进行改造,在短时Fourier变换的计算中利用自回归(AR)谱估计代替离散Fourier变换(DFT),得到了一种基于AR谱估计的短时AR谱分析方法.短时AR谱分析方法能够较好地给出柴油机缸盖振动信号的时频分布表示,提高了气阀漏气故障诊断的准确性.
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| 关 键 词： | 柴油机 气阀机构 故障诊断 短时AR谱分析 谱分析方法 柴油机 气阀漏气 故障诊断 spectrum analysis based leakage valve diesel diagnosis 分布表 时频 振动信号 缸盖 离散 谱估计 自回归 利用 计算 改造 |
| 文章编号： | 1005-8354(2007)03-0012-03 |
| 修稿时间： | 2006-06-02 |
Fault diagnosis of diesel valve leakage based on short-time AR spectrum analysis |
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| LI Tao,Li Ai-hua,WU Zhao-jun,WU Yu-feng.Fault diagnosis of diesel valve leakage based on short-time AR spectrum analysis[J].Mechanical and Electrical Equipment,2007,24(3):12-14. |
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| Authors: | LI Tao Li Ai-hua WU Zhao-jun WU Yu-feng |
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| Abstract: | In the calculation of STFT, discrete Fourier transform (DFT) is replaced by autoregressive (AR) spectrum estimation, and a new method based on AR spectrum estimation is gained, namely short-time AR spectrum analysis. The method is applied to fault diagnosis of valve in leakage, and the results show that it can give a better time-frequency distribution expression of signals and improve veracity of the diagnosis. |
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| Keywords: | diesel engine valve train fault diagnosis short-time AR spectrum analysis |
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