Numerical Stability Test of Neutral Delay Differential Equations

Figure 1

Graphical test for the rightmost root of (3.1): (a) the Nyquist plot of Δ(𝑖𝜔)/(1+𝑖𝜔)²; (b) the Nyquist plot of Δ(𝑖𝜔−0.1155)/(1+𝑖𝜔)².

(a)

(b)