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authorSiddharth Agarwal2019-09-03 18:27:40 +0530
committerSiddharth Agarwal2019-09-03 18:27:40 +0530
commit8ac15bc5efafa2afc053c293152605b0e6ae60ff (patch)
treee1bc17aae137922b1ee990f17aae4a6cb15b7d87 /Working_Examples/3432/CH6
parent52a477ec613900885e29c4a0b02806a415b4f83a (diff)
downloadXcos_block_examples-master.tar.gz
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Xcos_block_examples-master.zip
Xcos examples from textbooks and for blocksHEADmaster
Diffstat (limited to 'Working_Examples/3432/CH6')
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diff --git a/Working_Examples/3432/CH6/EX6.10/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.10/DEPENDENCIES/fig_settings.sci
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--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.10/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.10/Ex6_10.sce b/Working_Examples/3432/CH6/EX6.10/Ex6_10.sce
new file mode 100755
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@@ -0,0 +1,46 @@
+//Example 6.10
+// Nyquist plot for an Open-loop unstable system.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function
+s=poly(0,'s');
+sysG=(s+1)/(s*(s/10-1));
+evans(sysG,50)
+exec .\fig_settings.sci; //custom script for setting figure properties
+title(["Root Locus for","$G(s)=(s+1)/[s(s/10-1)]$"],'fontsize',3)
+zoom_rect([-5 -4 5 4])
+f=gca();
+f.x_location = "origin"
+f.y_location = "origin"
+h=legend('');
+h.visible = "off"
+
+g1=syslin('c',(s+1)/(s*(s/10-1)));
+//------------------------------------------------------------------
+//The bode plot of the system
+figure;
+bode(g1,0.1/2/%pi,100/2/%pi,"rad")
+exec .\fig_settings.sci; //custom script for setting figure properties
+title(["Bode plot for","$G(s)=(s+1)/[s(s/10-1)]$"],'fontsize',3)
+//bode(g,2*%pi*0.1,2*%pi*100)
+//------------------------------------------------------------------
+figure;
+//The nyquist plot of the system
+nyquist(g1,0.5/2/%pi,100/2/%pi,0.05)
+exec .\fig_settings.sci; //custom script for setting figure properties
+title(["Nyquist plot for","$G(s)=(s+1)/[s(s/10-1)]$"],'fontsize',3)
+f=gca();
+f.x_location = "origin";
+f.y_location = "origin";
+zoom_rect([-2 -2 1 2]);
+xset("color",2);
+xset("font size", 3);
+xstring(-1,1.5,"${\fgcolor{blue}{\omega>0}}$",0,0);
+xstring(-1,-1.5,"${\fgcolor{blue}{\omega<0}}$",0,0);
+xstring(-1.5,0,"${\fgcolor{blue}{\omega=\pm \sqrt{10}}}$",0,0);
+xstring(-0.5,0.1,"${\fgcolor{blue}{\omega=\infty}}$",0,0);
+xarrows([-0.2;0],[0.2;0],-1,2)
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.10/Ex6_10_f0.pdf b/Working_Examples/3432/CH6/EX6.10/Ex6_10_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.10/Ex6_10_f1.pdf b/Working_Examples/3432/CH6/EX6.10/Ex6_10_f1.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.11/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.11/DEPENDENCIES/fig_settings.sci
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--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.11/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.11/Ex6_11.sce b/Working_Examples/3432/CH6/EX6.11/Ex6_11.sce
new file mode 100755
index 0000000..4a78234
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+++ b/Working_Examples/3432/CH6/EX6.11/Ex6_11.sce
@@ -0,0 +1,28 @@
+//Example 6.11
+// Stability properties for a conditionally stable system.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function
+s=poly(0,'s');
+Gs=(s+10)^2/(s^3);
+evans(Gs,100)
+exec .\fig_settings.sci; //custom script for setting figure properties
+zoom_rect([-40 -20 5 20])
+title(["Root locus for","$G(s)=(s+10)^2/s^3$"],'fontsize',3)
+h=legend('');
+h.visible = "off"
+Gs1=syslin('c',(s+10)^2/(s^3));
+//------------------------------------------------------------------
+//The nyquist plot of the system
+figure;
+nyquist(7*Gs1,8/2/%pi,100/2/%pi,0.005)
+exec .\fig_settings.sci; //custom script for setting figure properties
+title(["Nyquist plot for","$G(s)=(s+10)^2/s^3$"],'fontsize',3)
+f=gca();
+f.x_location = "origin";
+f.y_location = "origin";
+xset("color",2);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.11/Ex6_11_f0.pdf b/Working_Examples/3432/CH6/EX6.11/Ex6_11_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.11/Ex6_11_f1.pdf b/Working_Examples/3432/CH6/EX6.11/Ex6_11_f1.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.12/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.12/DEPENDENCIES/fig_settings.sci
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--- /dev/null
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@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.12/Ex6_12.sce b/Working_Examples/3432/CH6/EX6.12/Ex6_12.sce
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+++ b/Working_Examples/3432/CH6/EX6.12/Ex6_12.sce
@@ -0,0 +1,40 @@
+//Example 6.12
+// Nyquist plot for a system with Multiple Crossover frequencies
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function
+s=poly(0,'s');
+K=85;
+g1=K*(s+1)/(s^2*(s^2+2*s+82));
+g2=(s^2+2*s+43.25)/(s^2+2*s+101);
+
+Gs=syslin('c',g2*g1);
+//------------------------------------------------------------------
+figure;
+//The nyquist plot of the system
+nyquist(Gs,0.5/2/%pi,100/2/%pi,0.005)
+title(["Nyquist plot for the complex system";...
+"$G(s)=85(s+1)(s^2+2s+43.25)/[((s^2+2s+82)(s^2+2s+101)]$"],...
+'fontsize',3)
+exec .\fig_settings.sci; //custom script for setting figure properties
+zoom_rect([-2 -1 0.6 1])
+f=gca();
+f.x_location = "origin";
+f.y_location = "origin";
+xset("color",2);
+//------------------------------------------------------------------
+//The bode plot of the system
+gm=g_margin(Gs);
+pm=p_margin(Gs)
+disp(pm,"Phase margin",gm,"Gain margin")
+figure(1)
+bode(Gs,0.01/2/%pi,100/2/%pi,0.01)
+title(["Bode plot for";...
+"$G(s)=85(s+1)(s^2+2s+43.25)/[((s^2+2s+82)(s^2+2s+101)]$"],...
+'fontsize',3)
+exec .\fig_settings.sci; //custom script for setting figure properties
+//------------------------------------------------------------------
+
diff --git a/Working_Examples/3432/CH6/EX6.12/Ex6_12_f0.pdf b/Working_Examples/3432/CH6/EX6.12/Ex6_12_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.13/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.13/DEPENDENCIES/fig_settings.sci
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--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.13/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.13/Ex6_13.sce b/Working_Examples/3432/CH6/EX6.13/Ex6_13.sce
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+++ b/Working_Examples/3432/CH6/EX6.13/Ex6_13.sce
@@ -0,0 +1,77 @@
+//Example 6.13
+// Use of simple design criterion for spacecraft attitude control.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function
+s=poly(0,'s');
+G=1/s^2;
+g1=syslin('c',G);
+
+//The bode plot of the system
+zoom_rect([0.01 -20 100 60])
+bode(g1,0.05/2/%pi,2/2/%pi,"rad")
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('Magnitude of the spacecrafts frequency','fontsize',3)
+//------------------------------------------------------------------
+
+K=1;
+Td=20;
+Ds=(Td*s+1);
+gd1=syslin('c',K*Ds*G);
+
+////The bode plot of compnenstaed open loop system
+figure
+bode(gd1,0.01/2/%pi,1/2/%pi,"rad")
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('Bode plot for compensated open-loop transfer function'...
+,'fontsize',3)
+xstring(0.02,70,"-40db/decade",0,0);
+xstring(0.2,40,"-20db/decade",0,0);
+
+//The bode plot of compnenstaed closed loop system
+K=0.01;
+gc1=K*gd1/(1+K*gd1);
+gcl1=syslin('c',gc1);
+figure
+bode(gcl1,0.01/2/%pi,10/2/%pi,"rad")
+title('Closesd loop frequency response','fontsize',3)
+exec .\fig_settings.sci; //custom script for setting figure properties
+
+//Bandwidth
+[frq, repf,splitf]=repfreq(gc1,[0.01/2/%pi:0.001:10/2/%pi]);
+[db, phi]=dbphi(repf);
+w=find(db<=db(1)-3);
+wc=w(1);
+frqc=frq(wc)*2*%pi;
+
+plot2d3(frqc,db(wc),5)
+
+[r c]=size(frq(1:w(1)));
+magn=db(wc)*ones(r,c)
+plot(frq(1:w(1))*2*%pi,magn,"b--")
+temp_db=db(w);
+[r c]=size(db(w));
+temp_w=frqc*ones(r,c);
+plot(temp_w,temp_db,"b--")
+xset("font size", 3);
+xstring(0.04,-16,"$\omega_{BW}$");
+xstring(frqc,-4,"-3db");
+xset("line style",4)
+xarrows([0.01;frqc],[-10;-10],-0.2,5)
+xarrows([frqc;0.01],[-10;-10],-0.2,5)
+//------------------------------------------------------------------
+//Step response of PD compnensation
+figure
+t=0:0.5:100;
+v=csim('step',t,gcl1);
+plot2d(t,v)
+
+//Title, labels and grid to the figure
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('Step response for PD compensation','fontsize',3)
+xlabel('Time t (sec.)','fontsize',2)
+ylabel('$\theta$','fontsize',2)
+//-------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.13/Ex6_13_f0.pdf b/Working_Examples/3432/CH6/EX6.13/Ex6_13_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.14/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.14/DEPENDENCIES/fig_settings.sci
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--- /dev/null
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@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.14/Ex6_14.sce b/Working_Examples/3432/CH6/EX6.14/Ex6_14.sce
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@@ -0,0 +1,8 @@
+//Example 6.14
+//Lead compensation for DC motor.
+
+// the required value
+// for step response, set sw to 2
+// for ramp response, set sw to 0
+
+sw = 2
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diff --git a/Working_Examples/3432/CH6/EX6.15/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.15/DEPENDENCIES/fig_settings.sci
new file mode 100755
index 0000000..5d5e7d4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.15/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.15/Ex6_15.sce b/Working_Examples/3432/CH6/EX6.15/Ex6_15.sce
new file mode 100755
index 0000000..2a3b9a4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.15/Ex6_15.sce
@@ -0,0 +1,78 @@
+//Example 6.15
+//Lead compensation for Temperature Control System.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function
+s=poly(0,'s');
+numG=1;
+denG=(s/0.5+1)*(s+1)*(s/2+1);
+sysG=numG/denG;
+//Dc gain
+K=9;
+
+KGs=syslin('c',K*sysG);
+
+//Lead compensator 1
+numD=s+1;
+denD=s/3+1;
+D1=numD/denD;
+D1s=syslin('c',D1);
+
+KGD1s=D1s*KGs; //compensated system
+
+//Lead compensator 2
+numD=s/1.5+1;
+denD=s/15+1;
+D2=numD/denD;
+D2s=syslin('c',D2);
+
+KGD2s=D2s*KGs; //compensated system
+
+//The bode plot of the system with K
+bode([KGs;KGD1s;KGD2s],0.1/2/%pi,10/2/%pi,['KG';'KGD1';'KGD2'],"rad");
+exec .\fig_settings.sci; // custom script for setting figure properties
+title('Bode plot for lead compensation design','fontsize',3)
+//------------------------------------------------------------------
+//Margins of uncompensated and compensated systems
+[gm1,wcg1]=g_margin(KGs);
+[pm1,wcp1]=p_margin(KGs);
+disp(wcp1*2*%pi,"Wcp",wcg1*2*%pi,"Wcg",pm1,...
+"Phase margin",gm1,"Gain margin",...
+"Uncompensated system :")
+
+[gm2,wcg2]=g_margin(KGD1s);
+[pm2,wcp2]=p_margin(KGD1s);
+disp(wcp2*2*%pi,"Wcp",wcg2*2*%pi,"Wcg",pm2,...
+"Phase margin",gm2,"Gain margin",...
+"System with D1 compensator :")
+
+[gm3,wcg3]=g_margin(KGD2s);
+[pm3,wcp3]=p_margin(KGD2s);
+disp(wcp3*2*%pi,"Wcp",wcg3*2*%pi,"Wcg",pm3,...
+"Phase margin",gm3,"Gain margin",...
+"System with D2 compensator :")
+//------------------------------------------------------------------
+//step response comparison
+//closed loop system
+Gc1=KGD1s/(KGD1s+1);
+Gc2=KGD2s/(KGD2s+1);
+figure;
+t=0:0.05:20;
+v1=csim('step',t,Gc1);
+v2=csim('step',t,Gc2);
+plot2d([t',t'],[v1',v2'])
+
+//Title, labels and grid to the figure
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('Step response for lead compensation design','fontsize',3)
+xlabel('Time t (sec.)','fontsize',2)
+ylabel('y','fontsize',2)
+
+xset("font size", 3);
+xarrows([2.5;1.5],[1.3;1.2],-1,1)
+xstring(2.5,1.3,"D2",0,0)
+xstring(4,1.2,"D1",0,0)
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.15/Ex6_15_f0.pdf b/Working_Examples/3432/CH6/EX6.15/Ex6_15_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.16/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.16/DEPENDENCIES/fig_settings.sci
new file mode 100755
index 0000000..5d5e7d4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.16/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.16/Ex6_16.sce b/Working_Examples/3432/CH6/EX6.16/Ex6_16.sce
new file mode 100755
index 0000000..a21196a
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.16/Ex6_16.sce
@@ -0,0 +1,55 @@
+//Example 6.16
+//Lead compensation for Servomechanism System.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function
+s=poly(0,'s');
+numG=10;
+denG=s*(s/2.5+1)*(s/6+1);
+G=numG/denG;
+//Dc gain
+K=1;
+
+KGs=syslin('c',K*G);
+
+//Lead compensator 1
+numD=s/2+1;
+denD=s/20+1;
+D1=numD/denD;
+D1s=syslin('c',D1);
+
+KGD1s=D1s*KGs; //compensated system
+
+//Lead compensator 2
+numD=s/4+1;
+denD=s/40+1;
+D2=D1*numD/denD; //double compensator
+D2s=syslin('c',D2);
+
+
+KGD2s=D2s*KGs; //compensated system
+
+//The bode plot of the system with K
+bode([KGs;KGD1s;KGD2s],0.1/2/%pi,100/2/%pi,['KG';'KGD1';'KGD2'],"rad");
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('Bode plot for lead compensation design','fontsize',3)
+//------------------------------------------------------------------
+//Margins of uncompensated and compensated systems
+[gm1,wcg1]=g_margin(KGs);
+[pm1,wcp1]=p_margin(KGs);
+disp(wcp1*2*%pi,"Wcp",wcg1*2*%pi,"Wcg",pm1,...
+"Phase margin",gm1,"Gain margin","Uncompensated system :")
+
+[gm2,wcg2]=g_margin(KGD1s);
+[pm2,wcp2]=p_margin(KGD1s);
+disp(wcp2*2*%pi,"Wcp",wcg2*2*%pi,"Wcg",pm2,...
+"Phase margin",gm2,"Gain margin","System with D1 compensator :")
+
+[gm3,wcg3]=g_margin(KGD2s);
+[pm3,wcp3]=p_margin(KGD2s);
+disp(wcp3*2*%pi,"Wcp",wcg3*2*%pi,"Wcg",pm3,...
+"Phase margin",gm3,"Gain margin","System with D2 compensator :")
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.16/Ex6_16_f0.pdf b/Working_Examples/3432/CH6/EX6.16/Ex6_16_f0.pdf
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+++ b/Working_Examples/3432/CH6/EX6.16/Ex6_16_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.17/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.17/DEPENDENCIES/fig_settings.sci
new file mode 100755
index 0000000..5d5e7d4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.17/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.17/Ex6_17.sce b/Working_Examples/3432/CH6/EX6.17/Ex6_17.sce
new file mode 100755
index 0000000..22af946
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.17/Ex6_17.sce
@@ -0,0 +1,57 @@
+//Example 6.17
+//Lag compensation for Temperature Control System.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function
+s=poly(0,'s');
+numG=1;
+denG=(s/0.5+1)*(s+1)*(s/2+1);
+G=numG/denG;
+//Dc gain
+K=3; //to set phase requirement
+
+KGs=syslin('c',K*G);
+
+//Lag compensator
+numD=5*s+1;
+denD=15*s+1;
+D=3*numD/denD;
+Ds=syslin('c',D);
+
+KGDs=Ds*KGs; //compensated system
+
+//The bode plot of the system with K
+bode([KGs;KGDs],0.01/2/%pi,10/2/%pi,['KG';'KGD'],"rad");
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('Frequency response of lag-compensation design','fontsize',3)
+
+//------------------------------------------------------------------
+//Margins of uncompensated and compensated systems
+[gm1,wcg1]=g_margin(KGs);
+[pm1,wcp1]=p_margin(KGs);
+disp(wcp1*2*%pi,"Wcp",wcg1*2*%pi,"Wcg",pm1,"Phase margin",...
+gm1,"Gain margin","Uncompensated system :")
+
+[gm2,wcg2]=g_margin(KGDs);
+[pm2,wcp2]=p_margin(KGDs);
+disp(wcp2*2*%pi,"Wcp",wcg2*2*%pi,"Wcg",pm2,"Phase margin",...
+gm2,"Gain margin","Compensated system :")
+
+//------------------------------------------------------------------
+//step response
+//closed loop system
+Gc=KGDs/(KGDs+1);
+figure;
+t=0:0.05:20;
+v=csim('step',t,Gc);
+plot2d(t,v)
+
+//Title, labels and grid to the figure
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('Step response for lag compensation design','fontsize',3)
+xlabel('Time t (sec.)','fontsize',2)
+ylabel('y','fontsize',2)
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.17/Ex6_17_f0.pdf b/Working_Examples/3432/CH6/EX6.17/Ex6_17_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.18/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.18/DEPENDENCIES/fig_settings.sci
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index 0000000..5d5e7d4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.18/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.18/Ex6_18.sce b/Working_Examples/3432/CH6/EX6.18/Ex6_18.sce
new file mode 100755
index 0000000..0ec43ba
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.18/Ex6_18.sce
@@ -0,0 +1,42 @@
+//Example 6.18
+//Lag compensation for DC motor.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function
+s=poly(0,'s');
+g=1/s/(s+1);
+K=10; //DC gain
+KGs=syslin('c',K*g);
+
+//Lag compensator
+numD=10*s+1; //0.1
+denD=100*s+1; //0.01
+D=numD/denD;
+Ds=syslin('c',D);
+
+KGDs=Ds*KGs; //compensated system
+
+//The bode plot of the system
+bode([KGs;KGDs],0.001/2/%pi,10/2/%pi,['KG(s)';'D(s)G(s)'],"rad");
+exec .\fig_settings.sci; // custom script for setting figure properties
+title('Frequency response of lag-compensation design...
+ of DC motor','fontsize',3)
+//------------------------------------------------------------------
+//step response
+//closed loop system
+Gc=KGDs/(KGDs+1);
+figure;
+t=0:0.05:50;
+v=csim('step',t,Gc);
+plot(t,v,2)
+
+//Title, labels and grid to the figure
+exec .\fig_settings.sci; // custom script for setting figure properties
+title('Step response for Lag-compensation design...
+ of DC motor','fontsize',3)
+xlabel('Time t (sec.)','fontsize',2)
+ylabel('y','fontsize',2)
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.18/Ex6_18_f0.pdf b/Working_Examples/3432/CH6/EX6.18/Ex6_18_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.19/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.19/DEPENDENCIES/fig_settings.sci
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index 0000000..5d5e7d4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.19/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.19/Ex6_19.sce b/Working_Examples/3432/CH6/EX6.19/Ex6_19.sce
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index 0000000..126f637
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.19/Ex6_19.sce
@@ -0,0 +1,74 @@
+//Example 6.19
+//PID compensation design for spacecraft attitude control.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function
+s=poly(0,'s');
+G1=(0.9/s^2);
+G2=(2/(s+2));
+G=G1*G2;
+Gs=syslin('c',G);
+
+// PID controller parameters
+Td_inv=0.1; // Td_inv=1/Td=0.1
+Kd=1/Td_inv; //Kd=Td=Td_inv (derivative gain)
+
+Ti_inv=0.005; // Ti_inv=1/Ti=0.005
+Ki=Ti_inv; //Ki=Ti_inv (integral gain)
+
+Kp=0.05 //Kp (Proportional gain)
+
+D=Kp*(Kd*s+1)*(Ki/s+1); //PID Compensator
+
+Dsc=syslin('c',D);
+
+Ds=syslin('c',D/Kp); //PID Compensator with Kp=1
+// Compensated system with Kp=1
+GDs=Gs*Ds;
+//PID compensated system Kp=0.05;
+GDsc=Gs*Dsc;
+//------------------------------------------------------------------
+//The bode plots
+bode([Gs;GDs;GDsc],0.01/2/%pi,100/2/%pi,...
+['G(s)';'D(s)G(s) with (Kp=1)';'D(s)G(s) with (Kp=0.05)'],"rad");
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('Compensation for PID design','fontsize',3)
+
+//Phase margin of pid compensated system with Kp=0.05;
+[pm wcp]=p_margin(GDsc);
+
+//------------------------------------------------------------------
+//closed loop system
+//step response
+Gc=GDsc/(GDsc+1);
+figure;
+t=0:0.05:40;
+y=csim('step',t,Gc);
+plot(t,y,2)
+
+//Title, labels and grid to the figure
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('Step response for PID compensation of spacecraft'...
+,'fontsize',3)
+xlabel('Time t (sec.)','fontsize',2)
+ylabel('$theta$','fontsize',2)
+//------------------------------------------------------------------
+//step disturbance response
+Gc=G1/((G1*G2*D)+1);
+Gcs=syslin('c',Gc);
+figure;
+t=0:0.5:1000;
+u=0.1*ones(1,length(t));
+y=csim(u,t,Gcs)
+plot(t,y,2)
+
+//Title, labels and grid to the figure
+exec .\fig_settings.sci; // custom script for setting figure properties
+title('Step disturbance response for PID compensation...
+ of spacecraft','fontsize',3)
+xlabel('Time t (sec.)','fontsize',2)
+ylabel('$theta$','fontsize',2)
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.19/Ex6_19_f0.pdf b/Working_Examples/3432/CH6/EX6.19/Ex6_19_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.2.b/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.2.b/DEPENDENCIES/fig_settings.sci
new file mode 100755
index 0000000..5d5e7d4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.2.b/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.2.b/Ex6_2.sce b/Working_Examples/3432/CH6/EX6.2.b/Ex6_2.sce
new file mode 100755
index 0000000..03eae0b
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.2.b/Ex6_2.sce
@@ -0,0 +1,28 @@
+//Example 6.2
+//Frequency response characteristics of Lead compensator.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function and its bode plot
+K=1, T=1, alpha=0.1
+s=poly(0,'s');
+sysD=syslin('c',K*(T*s+1)/(alpha*T*s+1));
+
+//The bode plot of the system
+
+fmin=0.1/2/%pi; //mininmum frq. in Hz for response (0.1 rad/sec)
+fmax=100/2/%pi; //maximum frq. in Hz for response (100 read/sec)
+//------------------------------------------------------------------
+//Bode plot for frequency in Hz (scilab ver. 5.4.1)
+//bode(g,fmin,fmax);
+//OR
+//Bode plot for frequency in rad/sec (scilab ver. 5.5.1)
+bode(sysD,fmin,fmax,"rad")
+
+//------------------------------------------------------------------
+title('(a) Magnitude and (b) phase for the lead compensator',...
+'fontsize',3)
+exec .\fig_settings.sci; //custom script for setting figure properties
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.2.b/Ex6_2_f0.pdf b/Working_Examples/3432/CH6/EX6.2.b/Ex6_2_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.3/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.3/DEPENDENCIES/fig_settings.sci
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index 0000000..5d5e7d4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.3/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.3/Ex6_3.sce b/Working_Examples/3432/CH6/EX6.3/Ex6_3.sce
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index 0000000..bb49eb0
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+++ b/Working_Examples/3432/CH6/EX6.3/Ex6_3.sce
@@ -0,0 +1,65 @@
+//Example 6.3
+//Bode Plot for Real Poles and Zeros.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function and its bode plot
+K=2000;
+s=poly(0,'s');
+Gs=syslin('c',(K*(s+0.5))/(s*(s+10)*(s+50)));
+
+//The bode plot of the system
+wmin=0.1; // mininmum frq. in rad/sec for response
+wmax=100; // maximum frq. in red/sec for response
+fmin=wmin/2/%pi // mininmum frq. in Hz for response
+fmax=wmax/2/%pi // maximum frq. in Hz for response
+//------------------------------------------------------------------
+//Bode plot for frequency in Hz (scilab ver. 5.4.1)
+//bode(g,fmin,fmax)
+//OR
+//(Only for scilab ver. 5.5.1)
+//Bode (frequency scale in rad/sec)
+// or gainplot or phaseplot plot with asymptotes
+figure(0)
+gainplot(Gs,fmin,fmax);
+bode_asymp(Gs,wmin,wmax);
+xstring(0.03,22,"slope=-1(-20db/dec)",0,0);
+xstring(0.2,9,"slope=0",0,0);
+xstring(3,7,"slope=-1(-20db/dec)",0,0)
+xstring(0.9,-8,"slope=-2(-40db/dec)",0,0)
+title('Composit plots (a) magnitude plot','fontsize',3);
+h=legend('');
+exec .\fig_settings.sci; //custom script for setting figure properties
+h.visible = "off"
+//------------------------------------------------------------------
+
+//phase plot for poles and zeros
+zr=((s/0.5)+1)/s //infact this is zero and pole at origin.
+zr=syslin('c', zr);
+pl1=1/((s/10)+1)
+pl1=syslin('c', pl1);
+pl2=1/((s/50)+1)
+pl2=syslin('c', pl2);
+figure(1)
+phaseplot([Gs;zr;pl1;pl2],fmin,fmax);
+xstring(5.5,-14,"$\frac {1}{s/0.5+1}$",0,0);
+xstring(2.8,-22,"$\frac{1}{s/50+1}$",0,0);
+xstring(2.5,-60,"$\frac{1}{s/10+1}$",0,0);
+xstring(1.2,-100,["Composite";"(Actual)"],0,0);
+title('Composit plots (b) Phase','fontsize',3);
+exec .\fig_settings.sci; //custom script for setting figure properties
+
+//------------------------------------------------------------------
+figure(2)
+bode(Gs,fmin,fmax,"rad"); //frequency scale n radians
+bode_asymp(Gs,wmin,wmax);
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('(c) magnitude plot and phase plot approximate and actual...
+','fontsize',3)
+xstring(2.8,-22,"$\frac{1}{s/50+1}$",0,0);
+h=legend('');
+h.visible = "off"
+
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.3/Ex6_3_f0.pdf b/Working_Examples/3432/CH6/EX6.3/Ex6_3_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.3/Ex6_3_f1.pdf b/Working_Examples/3432/CH6/EX6.3/Ex6_3_f1.pdf
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index 0000000..fa0837d
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diff --git a/Working_Examples/3432/CH6/EX6.4/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.4/DEPENDENCIES/fig_settings.sci
new file mode 100755
index 0000000..5d5e7d4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.4/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.4/Ex6_4.sce b/Working_Examples/3432/CH6/EX6.4/Ex6_4.sce
new file mode 100755
index 0000000..6e1124a
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+++ b/Working_Examples/3432/CH6/EX6.4/Ex6_4.sce
@@ -0,0 +1,28 @@
+//Example 6.4
+//Bode Plot with Complex Poles.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function and its bode plot
+K=10;
+s=poly(0,'s');
+Gs=syslin('c',(K)/(s*(s^2+0.4*s+4)));
+//The bode plot of the system
+
+fmin=0.1/2/%pi; //mininmum frq. in Hz for response (0.1 rad/sec)
+fmax=10/2/%pi; //maximum frq. in Hz for response (100 read/sec)
+//------------------------------------------------------------------
+//Bode plot for frequency in Hz (scilab ver. 5.4.1)
+//bode(g,fmin,fmax);
+//OR
+//Bode plot for frequency in rad/sec (scilab ver. 5.5.1)
+bode(Gs,fmin,fmax,0.01,"rad")
+
+//------------------------------------------------------------------
+title(['Bode plot for a transfer function with complex poles';...
+ '(a) magnitude...
+ (b) phase'],'fontsize',3)
+
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.4/Ex6_4_f0.pdf b/Working_Examples/3432/CH6/EX6.4/Ex6_4_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.6/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.6/DEPENDENCIES/fig_settings.sci
new file mode 100755
index 0000000..5d5e7d4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.6/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.6/Ex6_6.sce b/Working_Examples/3432/CH6/EX6.6/Ex6_6.sce
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index 0000000..a70ab9c
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+++ b/Working_Examples/3432/CH6/EX6.6/Ex6_6.sce
@@ -0,0 +1,30 @@
+//Example 6.6
+//Bode Plot for Complex Poles and Zeros:
+//Satellite with Flexible appendages.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function and its bode plot
+K=0.01;
+s=poly(0,'s');
+NumG=K*(s^2+0.01*s+1);
+DenG=s^2*((s^2/4)+0.02*(s/2)+1)
+sysG=syslin('c',NumG/DenG);
+
+fmin=0.09/2/%pi; //mininmum frq. in Hz for response (0.1 rad/sec)
+fmax=11/2/%pi; //maximum frq. in Hz for response (100 read/sec)
+//------------------------------------------------------------------
+//Bode plot for frequency in Hz (scilab ver. 5.4.1)
+//bode(g,fmin,fmax);
+//OR
+//Bode plot for frequency in rad/sec (scilab ver. 5.5.1)
+bode(sysG,fmin,fmax,0.01,"rad")
+
+//------------------------------------------------------------------
+title(["Bode plot for a transfer function with complex...
+poles and zeros"; "(a) magnitude (b) phase"],'fontsize',3)
+//------------------------------------------------------------------
+
+disp('NOTE : Result of the above example can be verified by checking the figures shown in example 6.5')
diff --git a/Working_Examples/3432/CH6/EX6.6/Ex6_6_f0.pdf b/Working_Examples/3432/CH6/EX6.6/Ex6_6_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.7/EX6_7_f0.pdf b/Working_Examples/3432/CH6/EX6.7/EX6_7_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.7/Ex6_7.sce b/Working_Examples/3432/CH6/EX6.7/Ex6_7.sce
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index 0000000..0ea6d5b
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+++ b/Working_Examples/3432/CH6/EX6.7/Ex6_7.sce
@@ -0,0 +1,44 @@
+//Example 6.7
+//Computation of velocity error constant Kv from Bode plot
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function and its bode plot
+K=10;
+s=poly(0,'s');
+Gs=syslin('c',(K)/(s*(s+1)));
+//The bode plot of the system
+
+fmin=0.01/2/%pi; //mininmum frq. in Hz for response (0.1 rad/sec)
+fmax=10/2/%pi; //maximum frq. in Hz for response (100 read/sec)
+//------------------------------------------------------------------
+//Bode plot for frequency in Hz (scilab ver. 5.4.1)
+//bode(g,fmin,fmax);
+//OR
+//Bode plot for frequency in rad/sec (scilab ver. 5.5.1)
+bode(Gs,fmin,fmax,0.01,"rad")
+title(['Determination of Kv from the Bode plot for the system',...
+'$10/[s(s+1)]$'],'fontsize',3)
+//choose frequency (rad) and magnitude from bode plot and calculate Kv
+//Here at w=0.01, magngitude in db is M=60
+//i.e actual magnitude of the reponse is |A|=10^(M/20)
+w=0.01; // in rad
+M=60 // in db
+A=10^(M/20) //actual gain
+
+//Velocity error constant Kv=w*|A(w)|
+Kv=w*A;
+disp(Kv,"The Velocity error Constant from bode plot is: ")
+//------------------------------------------------------------------
+// Computation of the Kv
+[frq repf]=repfreq(Gs,fmin,fmax);
+//frq in Hz, repf is freq. response in rectangular form.
+//From bode plot, Kv=w*|A(w)|
+//i.e Kv=2*pi*f*|A(2*pi*f)|
+
+idx=1;//selecting the frequency and response at that frequency from arrays
+Kv=2*%pi*frq(idx)*abs(repf(idx))
+disp(Kv,"The Velocity error Constant is computed at 0.0015915 Hz (0.01 rad/sec) : ")
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.8/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.8/DEPENDENCIES/fig_settings.sci
new file mode 100755
index 0000000..5d5e7d4
--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.8/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.8/Ex6_8.sce b/Working_Examples/3432/CH6/EX6.8/Ex6_8.sce
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index 0000000..6625052
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+++ b/Working_Examples/3432/CH6/EX6.8/Ex6_8.sce
@@ -0,0 +1,48 @@
+//Example 6.8
+// Nyquist plot for a second order system.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function and its root locus
+s=poly(0,'s');
+g=1/(s+1)^2;
+sysG=syslin('c',g);
+
+evans(sysG);
+exec .\fig_settings.sci; //custom script for setting figure properties
+f=gca();
+f.x_location = "origin"
+f.y_location = "origin"
+title(['Root locus of','$G(s)=1/(s+1)^2$','with respect to K'],...
+'fontsize',3)
+zoom_rect([-3,-2,2,3])
+h=legend('');
+h.visible = "off"
+//------------------------------------------------------------------
+figure(1)
+//The bode plot of the system
+fmin=0.01/2/%pi; //mininmum frq. in Hz for response (0.1 rad/sec)
+fmax=100/2/%pi; //maximum frq. in Hz for response (100 read/sec)
+
+//Bode plot for frequency in Hz (scilab ver. 5.4.1)
+//bode(g,fmin,fmax);
+//OR
+//Bode plot for frequency in rad/sec (scilab ver. 5.5.1)
+bode(sysG,fmin,fmax,0.01,"rad")
+title(['Open loop bode plot for', '$G(s)=1/(s+1)^2$'],'fontsize',3);
+exec .\fig_settings.sci; //custom script for setting figure properties
+//------------------------------------------------------------------
+
+figure(2)
+//The nyquist plot of the system
+nyquist(sysG);
+title('Nyquist plot of the evaluation of K G(s) for s=C1 and K=1'...
+,'fontsize',3);
+exec .\fig_settings.sci; //custom script for setting figure properties
+f=gca();
+f.x_location = "origin"
+f.y_location = "origin"
+xset('color',2)
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.8/Ex6_8_f0.pdf b/Working_Examples/3432/CH6/EX6.8/Ex6_8_f0.pdf
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diff --git a/Working_Examples/3432/CH6/EX6.9/DEPENDENCIES/fig_settings.sci b/Working_Examples/3432/CH6/EX6.9/DEPENDENCIES/fig_settings.sci
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--- /dev/null
+++ b/Working_Examples/3432/CH6/EX6.9/DEPENDENCIES/fig_settings.sci
@@ -0,0 +1,9 @@
+//------------------------------------------------------------------
+//figure handel settings
+f=get("current_figure"); //Current figure handle
+f.background=8; //make the figure window background white
+l=f.children(1);
+l.background=8 ;//make the text background white
+id=color('grey');
+xgrid(id);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.9/Ex6_9.sce b/Working_Examples/3432/CH6/EX6.9/Ex6_9.sce
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@@ -0,0 +1,53 @@
+//Example 6.9
+// Nyquist plot for a third order system.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//System transfer function
+s=poly(0,'s');
+g=syslin('c',1/(s*(s+1)^2));
+
+//The bode plot of the system
+fmin=0.01/2/%pi;
+fmax=100/2/%pi;
+//[frq,repf]=repfreq(g1,fmin,fmax,0.01);
+bode(g,fmin,fmax,"rad");
+frq=[1,10]/2/%pi;
+[frq, repf]=repfreq(g,frq);
+[db, phi]=dbphi(repf);
+plot(frq*2*%pi,db,'ro');
+exec .\fig_settings.sci; //custom script for setting figure properties
+title(["Bode plot for","$G(s)=1/[s(s+1)^2]$"],'fontsize',3)
+//zoom_rect([[0.1 0] -70 [12 -180] 20])
+xset("font size", 3);
+
+xstring(1,0,"$C\,\, (\omega=1)$",0,0);
+xstring(2,-75,"$E\,\, (\omega=10)$",0,0);
+f=gca();
+
+//------------------------------------------------------------------
+//The nyquist plot of the system
+figure;
+nyquist(g,0.8/2/%pi,10/2/%pi,0.02)
+
+exec .\fig_settings.sci; //custom script for setting figure properties
+title(["Nyquist plot for","$G(s)=1/[s(s+1)]^2$"],'fontsize',3)
+f=gca();
+f.x_location = "origin";
+f.y_location = "origin";
+zoom_rect([-1 -0.2 0.5 0.2]);
+xset("clipping", -1.2, 0.2, 1.4,0.4);
+xset("font size", 3);
+xset("color",2);
+xstring(-0.6,0.1,"${\fgcolor{blue}{\omega<0}}$",0,0);
+xstring(-0.6,-0.1,"${\fgcolor{blue}{\omega>0}}$",0,0);
+xstring(-0.7,0.005,"${\fgcolor{blue}{\omega=\pm 1}}$",0,0);
+xstring(-1,-0.2,...
+"${\fgcolor{blue}{\text{From \infty at \omega=0^+}}$",0,0);
+ xstring(-0.7,0.15,"${\fgcolor{blue}...
+ {\text{Towards \infty at \omega=0^-}}$",0,0);
+xstring(-0.525,-0.04,"C",0,0);
+xstring(-0.075,0,"E",0,0);
+//------------------------------------------------------------------
diff --git a/Working_Examples/3432/CH6/EX6.9/Ex6_9_f0.pdf b/Working_Examples/3432/CH6/EX6.9/Ex6_9_f0.pdf
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