METHOD FOR ADAPTIVE NOTCH FILTERING BASED ON ROBUST FREQUENCY ESTIMATION

摘要

The present invention relates to an adaptive notch filtering method using a robust vibration frequency estimating technique, comprising: extracting only a vibration signal existing within a specific bandwidth from an input signal by a band pass filter; and the band pass filter by a vibration signal model parameter calculation unit. Calculating a parameter for constructing the linear vibration signal model based on the signal output from the vibration signal model, constructing the vibration signal model using the parameter calculated by the vibration signal model parameter calculator by a robust frequency estimator, Applying a robust filter theory to obtain a vibration frequency estimate, and removing the vibration signal from the sensor measurement using the vibration frequency estimate estimated by the robust frequency estimator by a digital notch filter.;According to the present invention, unlike the conventional methods, the vibration frequency estimation problem is defined in terms of robust state estimation, and the vibration frequency estimator is implemented in the form of a cyclic filter to provide stable estimation performance with a small amount of calculation.;In addition, since it has a parallel structure for driving the notch filter by using the output of the vibration frequency estimator, it has a structural feature that can detect and cope with abnormal operating conditions of the vibration frequency estimator in advance.;Robust Vibration Frequency Estimator, Adaptive Notch Filter, Bandpass Filter