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+//Caption:overall_transfer_function_of_given_system

+//example 5.9.12

+//page 111

+syms Ka Ke Kf Rf Lf Jeq feq  N1 N2

+//where Ka=amplifier_gain; Ke=error_detector_gain;  Kf=motor_torque_const; Rf=field_resistance; Lf=field_inductance Jeq=moment_of_inertia; feq=coeff_of_viscous_friction;

+s=%s;

+d=N1/N2;

+Ka=10; Ke=8; Kf=0.05; Rf=5; Lf=0.25; Jeq=0.05; feq=0.075;  d=0.1;

+a=(Ka*Ke);

+b=Kf/(Rf+s*Lf);

+c=1/(s*(Jeq*s+feq));

+g=(b*c)   //in series

+h=(g*a)   //in series

+i=(h*d)   //in series

+j=i/(1+i);

+disp(j,"C(s)/R(s)=");