## please check my block diagram reduction to get transfer function.

Hello. I have a problem with block diagram.

I have to find transfer fuction of given block diagram with hand writting. Ive tried using block diagram reduction rule and I got a transfer fuction. and Ive plotted step response of transfer fuction I found to check either I did right or not. also I made same block diagram on my simulink to simulate. I compared both step response graphs. they are different. I didnt analysis both graphs in detail, but it looks pretty same shape. the different thing is value. of course, both graph might have different shape. because it is just my intuition. whatever, I attached my result of transfer fuction and given block diagram and each block’s value. and step response aswell. actually I put 4 for final value of step input. cause this is given value.

<</matlabcentral/answers/uploaded_files/53080/block%20diagram.png>>

<</matlabcentral/answers/uploaded_files/53083/compare%20graph.png>>

these are two step response graph. left one is from transfer function that I found by hand calculate. and right one is from simulink. to get left one I put code below. and you could know what I get as transfer function aswell.

num=[110.7 110.7 26.568];

den=[43.356 104.0450826 78.3535413 18.7056];

sys=tf(num,den);

t=0:0.1:8;

opt=stepDataOptions(‘StepAmplitude’,4);

y=step(sys,t,opt);

plot(t,y);

grid on;

<</matlabcentral/answers/uploaded_files/53085/parameter.png>>

these are parameters I got.

just in case I write how I simplified or reduce block diagram to get transfer function. first I moved r/itot block to the right of the point. and also multipied with block which value is 0.6154. and using feedback transfer fuction,(forward path gain)/(1+loopgain), I reduced block diagram. in the halfway of this process I moved armature current node to the far right to use feedback transfer function. of course it need to add block to multiply with current sensor sensitivity. and then I just kept going reduction.

please let me know what I did wrong. if any question or need more information to help me let me know aswell.

Thank you.Hello. I have a problem with block diagram.

I have to find transfer fuction of given block diagram with hand writting. Ive tried using block diagram reduction rule and I got a transfer fuction. and Ive plotted step response of transfer fuction I found to check either I did right or not. also I made same block diagram on my simulink to simulate. I compared both step response graphs. they are different. I didnt analysis both graphs in detail, but it looks pretty same shape. the different thing is value. of course, both graph might have different shape. because it is just my intuition. whatever, I attached my result of transfer fuction and given block diagram and each block’s value. and step response aswell. actually I put 4 for final value of step input. cause this is given value.

<</matlabcentral/answers/uploaded_files/53080/block%20diagram.png>>

<</matlabcentral/answers/uploaded_files/53083/compare%20graph.png>>

these are two step response graph. left one is from transfer function that I found by hand calculate. and right one is from simulink. to get left one I put code below. and you could know what I get as transfer function aswell.

num=[110.7 110.7 26.568];

den=[43.356 104.0450826 78.3535413 18.7056];

sys=tf(num,den);

t=0:0.1:8;

opt=stepDataOptions(‘StepAmplitude’,4);

y=step(sys,t,opt);

plot(t,y);

grid on;

<</matlabcentral/answers/uploaded_files/53085/parameter.png>>

these are parameters I got.

just in case I write how I simplified or reduce block diagram to get transfer function. first I moved r/itot block to the right of the point. and also multipied with block which value is 0.6154. and using feedback transfer fuction,(forward path gain)/(1+loopgain), I reduced block diagram. in the halfway of this process I moved armature current node to the far right to use feedback transfer function. of course it need to add block to multiply with current sensor sensitivity. and then I just kept going reduction.

please let me know what I did wrong. if any question or need more information to help me let me know aswell.

Thank you. Hello. I have a problem with block diagram.

I have to find transfer fuction of given block diagram with hand writting. Ive tried using block diagram reduction rule and I got a transfer fuction. and Ive plotted step response of transfer fuction I found to check either I did right or not. also I made same block diagram on my simulink to simulate. I compared both step response graphs. they are different. I didnt analysis both graphs in detail, but it looks pretty same shape. the different thing is value. of course, both graph might have different shape. because it is just my intuition. whatever, I attached my result of transfer fuction and given block diagram and each block’s value. and step response aswell. actually I put 4 for final value of step input. cause this is given value.

<</matlabcentral/answers/uploaded_files/53080/block%20diagram.png>>

<</matlabcentral/answers/uploaded_files/53083/compare%20graph.png>>

these are two step response graph. left one is from transfer function that I found by hand calculate. and right one is from simulink. to get left one I put code below. and you could know what I get as transfer function aswell.

num=[110.7 110.7 26.568];

den=[43.356 104.0450826 78.3535413 18.7056];

sys=tf(num,den);

t=0:0.1:8;

opt=stepDataOptions(‘StepAmplitude’,4);

y=step(sys,t,opt);

plot(t,y);

grid on;

<</matlabcentral/answers/uploaded_files/53085/parameter.png>>

these are parameters I got.

just in case I write how I simplified or reduce block diagram to get transfer function. first I moved r/itot block to the right of the point. and also multipied with block which value is 0.6154. and using feedback transfer fuction,(forward path gain)/(1+loopgain), I reduced block diagram. in the halfway of this process I moved armature current node to the far right to use feedback transfer function. of course it need to add block to multiply with current sensor sensitivity. and then I just kept going reduction.

please let me know what I did wrong. if any question or need more information to help me let me know aswell.

Thank you. block diagram, block diagram reduction rules, transfer function MATLAB Answers — New Questions