Robust Nonlinear Control Based on Describing Function Methods

  title={Robust Nonlinear Control Based on Describing Function Methods},
  author={James H. Taylor},
The robust control problem for nonlinear systems is discussed from the standpoint of the amplitude sensitivity of the nonlinear plant and final control system. Failure to recognize and accommodate this factor may give rise to nonlinear control systems that behave differently for small versus large input excitation, or perhaps exhibit limit cycles or instability. Sinusoidal-input describing functions (sidfs) are shown to be effective in dealing with amplitude sensitivity in two areas: modeling… CONTINUE READING
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