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Numerical Methods for Roots of Polynomials - Part II by Victor Pan, J.M. McNamee

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Chapter 14

Stability Considerations

J.M. McNamee and V.Y. Pan

Abstract

In considering the stability of mechanical systems we are led to the characteristic equation image. Continuous-time systems are stable if all the roots of this equation are in the left half-plane (Hurwitz stability), while discrete-time systems require all image (Schur stability). Hurwitz stability has been treated by the Cauchy index and Sturm sequences, leading to various determinantal criteria and Routh’s array, and several other methods. We also have to consider the question of robust ...

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