HHT Fuzzy Wavelet Neural Network to Identify Incipient Cavitations in Cooling pump of Engine

Abstract

Incipient cavitations i dentification is very practical and academic significance for cavity research in cooling pump of engine but it is very complicated. In this paper, a Hilbert-Huang transform （ HHT ） fuzzy wavelet neural network (FWNN) is proposed for incipient cavitations i dentification . The main incipient cavitations feature was extracted from entrance pressure fluctuation by the HHT. This FWNN uses wavelet basis function as membership function wh ich shape can be adjusted on line so that the networks have better learning and adaptive ability and at the same time combine the wavelet neural network with fuzzy logical theory to deal with complicated nonlinear, uncertain and fuzzy problem. At last the experiment showed that t h is i dentification model can provide fast and reliable incipient cavitations i dentifi cation with minimum assumptions and minimum requirements for modeling skills.