Adaptive Vibration Control Using Frequency Estimation For Multiple Periodic Disturbances with Adaptive Frequency Tracking.

Abstract

In this study, we focus on the error of estimated frequency of disturbance and present a new adaptive frequency tracking and new modification law after examining relation between the error of frequency and output level in detail. We also develop a multiple frequency estimation algorithm, which is insensitive to observation noise and prove the asymptotic stability for adaptive nonlinear algorithm and adaptive frequency tracking method theoretically. It is also identified that this algorithm converges to zero (or equilibrium point) faster if sampling time is set adequately. The results of simulation show that when estimated frequency by difference equation method approach to the true value, then the output error converges to zero (or equilibrium point) asymptotically. This corresponds to the asymptotic stability condition roughly. The effectiveness of this method and the theoretical proof are verified by simulation.