Purification of Rubbing Axis Trace by Harmonic Window Method

In order to purify rubbing axis trace, a novel purification way that does not need to decompose was proposed by using the harmonic window method. On the base of research for part decomposition in frequency domain, this method had the ability to decompose the arbitrary detail into frequency section, then the interested frequency band could be abstracted and reconstructed in time domain, so the purification of axis trace in one or more interested frequency bands could be realized. The advantage of harmonic window method in axis trace purification has been proved by the successful purification of firstly seven frequency sections from the miniature rotor test-bed´s vibration signals. This method also has simple algorithm and easy to be realized; it provides a new method for purification of rubbing axis trace.