You should be able to set the freqeuncy range using the following syntax:
- h = nyquistplot(___,w) plots Nyquist diagram for frequencies specified by the frequencies in w.
- If w is a cell array of the form {wmin,wmax}, then nyquistplot plots the Nyquist diagram at frequencies ranging between wmin and wmax.
- Specify frequencies in units of rad/TimeUnit, where TimeUnit is the TimeUnit property of the model.
load TransferFcnNyquist.mat
s=tf('s');
G0=(d_x*(d_Fx*SYSD{1,1}+d_Fy*SYSD{2,1}+d_Fz*SYSD{3,1})+...
d_y*(d_Fx*SYSD{2,1}+d_Fy*SYSD{2,2}+d_Fz*SYSD{3,2})+...
d_z*(d_Fx*SYSD{3,1}+d_Fy*SYSD{3,2}+d_Fz*SYSD{3,3}))*(...
exp(-T_t*s)-1)*b*k_cb;
figure(8);
NyquistPlot=nyquistplot(G0,{20*2*pi,200*2*pi});
% ^^^^^^^^^^^^^^^^^^ specify range in rad
setoptions(NyquistPlot,'ShowFullContour','off','FreqUnits','Hz','Grid','off');
CurrentPlots=get(gca,'children');
set(CurrentPlots(1),'DisplayName',['a_p=',num2str(a_p),' mm']);
set(gcf,'color','w');
set(gca, 'XMinorGrid','on', 'YMinorGrid','on');
legend('Location','best');
title('Ortskurve von G_0(jw)');
xline(1,'HandleVisibility','off');
