Modal Frequency Identification of Maize Picking Machine under Colored Noise Excitation

In order to solve the problem that the external excitation of the structure is mostly colored noise in practical engineering, the modal analysis of the structure is carried out in this paper using band-stop filter with FDD algorithm.Firstly, the vibration test of the maize picking machine was carried out, and then the unfiltered and filtered vibration signals were analyzed using the FDD algorithm, respectively, and finally the identification result was compared with the ERA results.The results show that the modal frequencies identified by FDD using band-stop filter are close to those of ERA, and the modal frequency deviation of 6-orders are in the range of 0.015-4.845Hz.The problem of FDD being affected by colored noise can be better solved by using band-stop filter processing the output signals.