An Adaptive Tracking Control of Fractional-Order Chaotic Systems with Uncertain System Parameter

Figure 4

(a) shows tracking errors 𝜀 between the fractional-order system (3.9) with uncertain parameter 𝛼 and the reference signal belongs to the fractional-order Lorenz system (3.1). (b) shows the parameter error 𝜀_𝛼 between uncertain parameter 𝛼 and the true value of the “unknown” parameter.

(a)

(b)