Abstract: Proposed is a method on the basis of singular vector spectrum for the removal of power interferences in vibration signals of rotating machinery.In this method,firstly,vibration signals are processed through singular value decomposition,and the useful components as well as the power frequency components are divided into different orthogonal subspaces.Then,as the singular vector spectrum reflects the energy distribution of each signal component,the subspace range of the singular vector corresponding to power interference is estimated according to the singular vector spectrum,in which singular vectors corresponding to power interferences are obtained by analyzing the spectrum features of singular vectors.Finally,the singular values corresponding to power interferences are determined and set to zero,and other singular values as well as singular vectors are used to reconstruct desired time-domain signals without power interferences.Simulated and experimental results demonstrate that the proposed method can effectively remove power interferences without any effect on other components of the vibration signal.

Key words: vibration signal, power interference, singular value decomposition, singular vector