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>).</div>

Complexity

fig17

Figure 17

Figure 17: Robust Stability of Fractional-Order Linear Time-Invariant Systems: Parametric versus Unstructured Uncertainty Models 