关键词: 小波包, 相空间重构, 支持向量机, 液压泵

Abstract:

For non-linear and non stationary characteristics of pressure signals for a hydraulic pump,this paper presented a kind of prediction method,which combined  wavelet packet analysis and chaos theory with SVM.This method can construct model and predict for pressure signals.Firstly,it used wavelet packet to decompose the time series of pressure signals for hydraulic pump and reconstruct every components.Secondly,it builts the corresponding chaos theory and SVM prediction model to predict every component.Finally,it reconstructed  all levels of prediction results.Through the experiments,the method can predict the trend of pressure signals effectively and have higher prediction precision,and can be applied in the system of condition monitoring and prediction.

Key words: wavelet packet, phase space reconstruction, support vector machine(SVM), hydraulic pump