Abstract: The modal parameters identification of flexible structure is presented by Gauss filter and Hilbert transform method. The simulation results indicate that the method can identify the close modal parameters of structure effective and have the better anti-noise capability. Used the method the modal parameters identification of space flexible truss structure has been accomplished and the results more closely the theory result of calculation than traditional method. The method can avoid effectively the leak frequency phenomenon and have high precision of identification.

Key words: Flexible structure, Gauss filter, Hilbert transform, Modal parameter identification