Abstract: The Bussgang algorithm is improved for the non-stationary signals with the aid of the reference noise to eliminate the noise in the composite signals and to minimite the generalized energy of output information in order to obtain the best denoising effect. Through the computer simulation, the suitable nonlinear function is determined. It is found from the simulation results that the function value of convergence error decreases the convergence performance is enhanced along with delay factors enlargement. The situations of two-faults and three-faults are tested, and the separation results are compared with the results based on ICA and the Bussgang algorithm, which indicates the improved algorithm is suitable to separate the non-stationary signals of the multi-units.

Key words: Blind deconvolution, Multi-faults, Vibration diagnosis