My Math Forum Request for help with tricky Riccati DE with exponential terms.

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 March 3rd, 2019, 12:45 AM #1 Newbie     Joined: Mar 2019 From: Germany Posts: 2 Thanks: 0 Request for help with tricky Riccati DE with exponential terms. Hi all, I am developing a model that requires me to derive the solution of a rather tricky Riccati DE, and I am having a devil of a time with it and am beginning to wonder if there is even a closed-form solution. Anyhow, the equation is $\displaystyle \frac{dE}{dt} = cB_{t} + bE_{t} + aE_{t}^{2},$ such that $\displaystyle B_{t} = g\left(\frac{1-\exp(ht)}{1-k\exp(ht)}\right)$ and $\displaystyle a, b, c, g, h,$ and $\displaystyle k$ are all constant. The intended integration domain for this function is time, which is positive- so we can assume continuity of the $\displaystyle cB_{t}$. I'm not really seeing any clear avenues that go anywhere toward a solution. None of the approaches I'm aware of for Riccati DEs seem to be bearing any fruit at all in terms of progress. I'd be greatly appreciative to anyone who can offer anything useful in terms of a path forward- either with respect to a closed-form solution or a quasi-analytic numerical one. Thank you in advance.
 March 3rd, 2019, 06:47 AM #2 Global Moderator   Joined: Dec 2006 Posts: 21,034 Thanks: 2269 Do you know the values of the constants?
March 11th, 2019, 12:54 PM   #3
Newbie

Joined: Mar 2019
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Quote:
 Originally Posted by skipjack Do you know the values of the constants?
Hi, apologies for the late response. No; the constants are unknown.

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