Information fusion of accelerometers based on the MEMD and holo-spectrum technology

Aiming at the coupling in the multi-channel signals measured by accelerometer, a method based on the multivariate empirical mode decomposition (MEMD) and holo-spectrum technology was put forward. Firstly, the MEMD method adaptively decomposed the multi-channel signals into many intrinsic mode functions(IMFs). Then the working frequency IMFs were selected for holo-spectrum analysis and the two-dimensional holo-spectrum and holo-waterfall-plot were obtained, from which the amplitude and direction of the vibration shape can be reflected visually and the vibration modal characteristics can be better analyzed. Finally this method was applied in the vibration analysis of forklift trucks steering wheel. The result proves the correctness and effectiveness of this method.