A question about optimal control

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SUMMARY

The forum discussion centers on optimal control theory, specifically addressing the derivation of equations related to Hamiltonian mechanics. The first equation presented is ##\dot{\lambda}=-H_{x}##, which requires division by two ##(3x^2+u^2)## for accuracy. Additionally, the second equation, ##u=-\lambda##, is questioned regarding its derivation. The discussion highlights the necessary condition for optimal control input, expressed as $$\frac{\partial H}{\partial u}=0$$, which is critical for understanding optimality conditions in control systems.

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mad mathematician
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Homework Statement
below
Relevant Equations
see below.
1738652840776.png

and its proposed solution:
1738652955583.png

Now the first equation seems to be ##\dot{\lambda}=-H_{x}##, but they seem to forget to divide by two ##(3x^2+u^2)##, and the second equation, I am not sure how did they derive the second equation of ##u=-\lambda##? anyone here knows how?
thanks!
 
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mad mathematician said:
and the second equation, I am not sure how did they derive the second equation of ##u=-\lambda##? anyone here knows how?

thanks!
There are two optimality conditions and one of them is a necessary condition for the optimal control input $$ \frac{\partial H}{\partial u}=0 $$.
 
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Gavran said:
There are two optimality conditions and one of them is a necessary condition for the optimal control input $$ \frac{\partial H}{\partial u}=0 $$.
Yeah, I know that. Forgot to reply that I found my answer... I hope to get a good grade in this course.
I tell you the exam was an open book; and I got so absent minded as to how to answer a few questions.
It's a pitty because the exam was really easy. (I had three exams this week in a row... phou :oldeek: ).
 

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