Numerical Stability Test of Neutral Delay Differential Equations

Figure 3

Graphical test for the rightmost root of (3.5): (a) the Nyquist plot of Δ(𝑖𝜔)/(1+𝑖𝜔); (b) the Nyquist plot of Δ(𝑖𝜔+0.7581+0.001)/(1+𝑖𝜔).

(a)

(b)