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/#EEq16">29</a>) and controller (<a href="https://static.hindawi.com/articles/complexity/volume-2018/8073481/figures/#EEq10">22</a>).</div>

Complexity

fig10

Figure 10

Figure 10: Robust Stability of Fractional-Order Linear Time-Invariant Systems: Parametric versus Unstructured Uncertainty Models 