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10 Problem A8.11 OGATA 4ed(Nyquist plot)



    Let's draw the Nyquist plot by Scilab.

    \begin{displaymath}G(s)=\frac{20 \cdot (s^{2}+s+0.5)}{s\cdot(s+1) \cdot(s+10)}\end{displaymath}

    Scilab program
    clf;
    
    s=%s/(%pi*2);
    
    g=20*(s^2+s+0.5)/(s*(s+1)*(s+10));
    
    gs=syslin('c',g);
    
    nyquist(gs);
    
    mtlb_axis([-2 3 -3 3]);
    
    

     


    Image ProblemaA8-11Pag600