Parameter Identification Method for Two Inertia Resonant Systems by Use of Both Observer and FFT.

In this paper, we propose a new parameter identification method for two inertia resonant systems with unknown Coulomb friction. The proposed method consists of two parts : the rigid model identification of the low-frequency band and the vibration model identification of the high frequency band. In the rigid model identification, we use the disturbance observer to identify the rigid model parameters. On the other hand, in the vibration model identification, fast Fourier transform is used to obtain the gains at the mechanical resonance frequency and at the anti resonance frequency. The gain curve fitting method based on both the rigid model parameters and the vdbration model parameters enables the elimination of the gain distortion caused by Coulomb friction and the estimation of the exact parameters.