Vibration Control of Flexible Structure Based on the Disturbance Rejection

In recent years, vibration control has been attracting great interest as an important research field on engineering. For example, in the case of control of the light weighted train, vibration caused by an influence on a disturbance and an appearance of resonances with flexible vehicle should be reduced for wide range of frequency. Furthermore, generally flexible structures have multiple resonance modes. In this study, for a flexible beam with multiple vibration modes, we realize vibration suppression control system using disturbance observer to cope with frequency variation. In order to demonstrate the usefulness of the proposed disturbance observer, disturbance force whose frequency is varied for some range is applied to the flexible beam. It can be confirmed by numerical simulations and experiments that the proposed control scheme has superior performance of vibration suppression as compared with the traditional disturbance observer.