摘要
针对振动信号中Hilbert-Huang变换的端点效应问题，结合端点效应产生机理和现有研究成果，提出基于时间尺度的LS-SVM端点延拓的抑制端点效应新方法。首先利用LS-SVM回归特性和一种自适应预测法分别对信号极值点的幅值和时间点进行预测延拓，然后对预测的极值信息进行埃尔米特插值，完成对原信号的延拓。利用仿真信号和实测航空发动机振动信号进行分析验证，表明该方法可同时有效抑制两种端点效应，并具有预测精度高、有效延拓距离长、速度快的特点。
Abstract
restrain end effect in Hilbert-Huang transformation (HHT) of vibration signal, considering the mechanism of the end effect and the current research development, a time scale-based LS-SVM end extension method is proposed. Firstly, by employing LS-SVM regression and a new adaptive prediction method, prediction extensions of the amplitude and time of the extremums are carried out respectively, and then with Hermite interpolation of the predicted extremums information implemented, original signal expansion is accomplished. Analysis and validation of simulation and measured aeroengine vibration signals show that the method proposed can effectively restrain the two end effects simultaneously and is of high prediction precision, long effective extension length and high expansion speed.
关键词
Hilbert-Huang变换 /
经验模态分解(EMD) /
端点效应 /
最小二乘支持向量机
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Key words
Hilbert-Huang transform /
empirical mode decomposition (EMD) /
end effect /
least squares support vector machine
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郭明威;倪世宏;朱家海;张志鹏.
振动信号中的HHT/EMD端点延拓方法研究[J]. 振动与冲击, 2012, 31(8): 62-66
GUO Ming-wei;NI Shi-hong;ZHU Jia-hai;ZHANG Zhi-peng.
HHT/EMD end extension method in vibration signal analysis[J]. Journal of Vibration and Shock, 2012, 31(8): 62-66
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脚注
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