# 3rd Order ODE on Simulink

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Parveen Ayoubi el 27 de Nov. de 2021
Respondida: Pat Gipper el 29 de Nov. de 2021
I have been trying to solve this differential equation for two days now. I do not know what to do with the right hand side of the ODE. The only way I have seen to solve it does not include the derivative of the input as well. Would really appreaciate some help atleast to know how to start it up.
y^''' (t)+6y^'' (t)+11y^'(t) +6y(t)=u^'' (t)+2u^' (t)+3u(t)
y’’(0) = 1 ; y’(0) = -1; y(0) = 1
where u=Unit step Us(t).
Ive tried to do it in simulink but I cant seem to get the right answer. Ill link what I have tried to do with it. (One of the problems is that we have to have the initital conditions present which we cant do with the transfer function)
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Parveen Ayoubi el 27 de Nov. de 2021
This is the other way but it also doesnt work.
Pat Gipper el 28 de Nov. de 2021
Editada: Pat Gipper el 29 de Nov. de 2021
Could it be something like this? Now you just need to figure out what u'' is that will result in u = unit step. It turns out that it requires a doublet as an input.

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### Respuestas (1)

Pat Gipper el 29 de Nov. de 2021
I approximated the required doublet input into an update to my comment with a summation of two very short pulse generators.
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