Use loopview to analyze the performance of a tuned control system you obtain using slTunable.looptune.
loopview plots the singular values of:
Open-loop frequency responses G*C and C*G. The controller C and plant G are the linearized portions of the Simulink® model defined by the Controls and Measurements properties of ST.
Sensitivity function S = inv(1+G*C) and complementary sensitivity T = 1-S
Normalized multi-loop disk margins (see loopmargin). loopview plots the:
Maximum stability margin
Tuned (optimized) stability margin
Actual (achieved) stability margin
Use the stability margin plot to verify that the tuned control system has the desired stability margin. The normalized margin value should be less than 1 at all frequencies.
For more information about singular values, see sigma.
Maximum allowed singular values for the sensitivity functions S and T. The curve marked S/T Max shows the maximum allowed S on the low-frequency side of the plot, and the maximum allowed T on the high-frequency side. These curves are the constraints that looptune imposes on S and T to enforce the target crossover range wc.
Target and tuned values of constraints imposed by any tuning goal requirements you used with looptune.
Use loopview with the info structure to assist in troubleshooting when tuning fails to meet all requirements.
slTunable interface describing the Simulink model to analyze.
info structure returned by slTunable.looptune during control system tuning.