Generalized Nyquist Stability of Perturbed Systems

  • Alexander Weinmann


Analysis and design of control systems in the frequency domain is one of the best known methods in control engineering. The stability of single-input single-output systems is investigated via transfer function calculus and Nyquist criterion (Leithead, W.E., and O'Reilly, J., 1991). Multi-input multi-output systems require the transfer matrix operations and characteristic loci. When plants are perturbed characteristic loci can be still used if they are augmented by E-contours or structured E-contours.


Transfer Matrix Stability Margin Stereographic Projection Riemann Sphere Structure Perturbation 
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Copyright information

© Springer-Verlag Wien 1991

Authors and Affiliations

  • Alexander Weinmann
    • 1
  1. 1.Department of Electrical EngineeringTechnical University ViennaAustria

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