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Rotor-stator partial rub detection based on Teager-Huang transform

The rubbing between rotor and stator often occurs in rotating machinery at posi-tion with small clearances and can cause unexpected machine downtime. So it is important to develop reliable tools for rub detection. As the rubbing process is nonlinear this paper beside conventional Fourier trans-form and Hilbert Huang Transform (HHT) also considers potential of Teager-Huang transform (THT). This approach is based on, empirical mode decomposi- tion (EMD) and Teager Kaiser energy operator (TKEO) technique. First, the orig-inal vibration signal is decomposed into Intrinsic Mode Function (IMF) compo-nents by using Empirical Mode Decomposition (EMD), and then Teager energy operator is applied to estimate the instantaneous amplitude and instantaneous fre-quency of each IMF component, so the time- frequency distribution of the ana-lyzed signal is obtained. Diagnostic tool is tested on laboratory test rig at two different rotor operating conditions i.e. without rotor–stator rubbing and with partial rotor–stator rub. Measurements of rotor lateral displacements were performed with non- contact eddy current displacement sensors.

Rotor-stator partial rub, Fault detection, Teager-Huang transform, Empirical Mode Decomposition

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