| 局域均值分解中PF获取方法的改进 |
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| 引用本文： | 梁世杰,韩维,康小伟,苏永前.局域均值分解中PF获取方法的改进[J].航空计算技术,2012(4):24-27. |
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| 作者姓名： | 梁世杰 韩维 康小伟 苏永前 |
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| 作者单位： | [1]海军航空工程学院研究生管理大队,山东烟台264001 [2]海军航空工程学院飞行器工程系,山东烟台264001 [3]海军驻宜宾地区航空军事代表室,四川宜宾644000 |
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| 基金项目： | 国家自然科学基金项目资助（51005242） |
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| 摘 要： | 航空发动机故障振动信号为典型的多分量信号,局域均值分解方法可以对其分离。在研究了经典的局域均值分解方法后,发现相邻的两个乘积函数(Production Function,PF)中存在模态混淆现象,表现为较高频PF中包含较低频PF的频率成分。针对这一问题,对PF的定义进行了改进,滤除了混淆在其中的低频信号,使信号分离更加充分。仿真信号的分析表明,改进后的算法分离效果优于原算法。试验信号的分析表明,方法可以用于航空发动机故障特征提取。
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| 关 键 词： | 信号分离 LMD 调幅调频信号 包络线 |
Improvement of PF Definition of Local Mean Decomposition |
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| LIANG Shi-jie,HAN Wei,KANG Xiao-wei,SU Yong-qian.Improvement of PF Definition of Local Mean Decomposition[J].Aeronautical Computer Technique,2012(4):24-27. |
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| Authors: | LIANG Shi-jie HAN Wei KANG Xiao-wei SU Yong-qian |
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| Institution: | LIANG Shi- jie , HAN Wei , KANG Xiao- wei SU Yong- qian ( 1. Administrant Bridge of Postgraduate, Navel Aeronautical Engineering Institute, Yantai 264001, China ; 2. Dept. of Airborne Vehicle Engineering,Navel Aeronautical Engineering Institute, Yantai 264001, China; 3. Aeronautical Military Representatives Bureau of Navy in Yibin, Yibin 644000, China) |
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| Abstract: | Fault vibration signal of aero- engine is multi- component signals and local mean decomposition can analyse it. After studying the original method, this paper discovers that mode confusion exists between adjacent Production Function（PF）. The higher- frequency PF contains signal of lower- frequency PF. To solve this problem, an improved PF is defined and this way can filter the mode confusion signal. The ana- lyse of artificial signal showed that the improved LMD is better than the original LMD in signal separa- tion. The application results of test- data showed that the improved LMD can extract characteristics of aero - engine fault vibration signal effectively. |
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| Keywords: | singal separation LMD demodulating amplitude and frequency modulated signals envelope curve |
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