Graphical Nonlinear System Analysis

23 Jul 2021  ·  Thomas Chaffey, Fulvio Forni, Rodolphe Sepulchre ·

We use the recently introduced concept of a Scaled Relative Graph (SRG) to develop a graphical analysis of input-output properties of feedback systems. The SRG of a nonlinear operator generalizes the Nyquist diagram of an LTI system. In the spirit of classical control theory, important robustness indicators of nonlinear feedback systems are measured as distances between SRGs.

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