Simulink Control Design™ - MathWorks

adequate stability margins and small overshoot. One remedy is to add a notch filter as

shown in Figure 3.

Figure 3: Digital Controller with Notch Filter

To tune this modified control architecture, create an slTuner instance with the three

tunable blocks.

ST0 = slTuner('rct_dmcNotch',{'Gain','Leadlag','Notch'});

By default the "Notch" block is parameterized as any second-order transfer function. To

retain the notch structure

specify the coefficients as real parameters and create a parametric model N of

the transfer function shown above:

wn = realp('wn',300);

zeta1 = realp('zeta1',1);

zeta2 = realp('zeta2',1);

12 Loop-Shaping Design