Abstract:

In order to remove the power interference in the vibration displacement signals of a novel tilting-pad journal bearing with fluid pivot,a power interference removal algorithm based on the harmonic wavelet and the singular value decomposition ( SVD) is proposed.In the algorithm,first,the frequency domain containing the power frequency is extracted by using the harmonic wavelet that has strict box-like spectrum and arbitrary detail of arbitrary frequency domain.Then,a Hankel matrix is constructed in the time domain,the singular value decomposition is performed,and the singular values relevant to the power frequency are set to be zero,thus removing the power frequency.Finally,all the sub-bands without power frequency are merged with the other sub-bands of the original frequency spectra.Thus,the time domain signals without the power interference are achieved for a further study.Experiment results show that the proposed algorithm can effectively remove the power interference.This algorithm helps to investigate the vibration characteristic of the novel tilting-pad journal bearing,and it is both practical and feasible.

Key words: harmonic wavelet, singular value decomposition, power interference, tilting-pad journal bearing