initial commit / add all books

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diff --git a/1151/CH11/EX11.2/example2.sce b/1151/CH11/EX11.2/example2.sce
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+printf("characterstic equation of the given system is s^2+1.4*s+14=0");

+printf("compare it with the standard second order characterstic equation s^2+2*d*w*s+w^2=0");

+w=sqrt(14);

+d=1.4/(2*w);

+d1=.7;

+Kt=2*(d1-d)/w;

+ess1=2*d/w;

+disp(d,"damping ratio")

+disp(w,"natural frrequency(in rad/sec)=")

+disp(ess1,"steady state error without derivative control = ")

+printf("overal transfer function with derivative control is C(s)/R(s)=w^2/(s^2+(2dw+w^2Kt)*s+w^2)=14/(s^2+5.23*s+14")

+disp(Kt,"Kt=")

+rt=(%pi-atan(sqrt((1-d1)/d1)))/(w*sqrt(1-d1^2));

+pt1=%pi/(w*sqrt(1-d1^2));

+mo1=exp((-%pi*d1)/sqrt(1-d1^2))*100;

+ess2=2*d1/w+Kt;

+disp(pt1,"peak time(in sec)for sytem with derivative control is")

+disp(rt,"rise time(in sec)for sytem with derivative control is")

+disp(mo1,"maximum overshoot(in %)for sytem with derivative control is")

+disp(ess2,"steady state error with derivative control = ")