Robust Stability of Fractional-Order Linear Time-Invariant Systems: Parametric versus Unstructured Uncertainty Models

<div>Envelope of Nyquist diagrams for FO plant family (<a href="https://static.hindawi.com/articles/complexity/volume-2018/8073481/figures/#EEq21">35</a>) and controller (<a href="https://static.hindawi.com/articles/complexity/volume-2018/8073481/figures/#EEq18">31</a>)—detailed view.</div>

Complexity

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Figure 18

Figure 18: Robust Stability of Fractional-Order Linear Time-Invariant Systems: Parametric versus Unstructured Uncertainty Models 