simulink: solving differential equations

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George Francis 2018-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/383543-simulink-solving-differential-equations

Hello guys I have transfer function which is below. And I need to create block diagram in simulink without using block "transfer function". I find out that I can use corresponding differential equation which should look like this:

a2*y'' + a1*y' + 1 = K*u
                  K
 transfer f= ----------------
              a2*s^2 + a1*s + 1

Here is my solution but I don't think it's correct, because I think I'm missing the part (+1) from differential equation.

So can somebody help me how should I fix it?

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