Periodic Disturbance Cancellation by using Dual-Input Describing Function (DIDF) Method

DIDF 방법을 이용한 주기성 외란의 제거

  • 최연욱 (부경대 제어계측공학과) ;
  • 이형기 (부경대 제어계측공학과)
  • Published : 2010.01.01


The issue of rejecting periodic disturbances arises in various applications dealing with rotating machinery. A new method using DIDF (Dual-Input Describing Function) is presented for the rejection of periodic disturbances with uncertain frequency. This can be added to an existing feedback control system without altering the closed-loop system stability. The objective is to design a nonlinear compensator to secure specified oscillation amplitude and frequency which are the same as disturbances. We suggest two procedures to determine coefficients for DIDF's synthesis. The structure of the proposed DIDF is so simple that we can easily synthesize. A number of computer simulations were carried out to demonstrate the salient feature of the proposed DIDF compared to the conventional ones(that is, adaptive algorithms).


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