(in progess) solar UAV model

[whoburg]

work in progress in sizing a solar-powered UAV planning to convert to modular version before merging

[whoburg]

I rebased this to squash some commits and force-pushed -- so if anyone happens to have a local copy of the LLhale branch, you'll need to re-fetch it from the remote.

Unfortunately I lost a few inline comments from @bqpd in the process -- sorry -- I'm a rebase newb.

[bqpd]

Noticed from playing with the interactive version:

• A only effects span right now
• payload mass and non-flight power don't have the extreme sensitivity difference between the two cases that everything else does

[bqpd]

15 has two different levels of stylistic changes to this

[bqpd]

at rho = 0.449

Variable	Variable Description	Variable Uncertainty	Variable Sensitivity	Contribution to Objective Uncertainty
(C_L^{1.5}/C_D)	power parameter	±1%	-2.996	3%
P_{non flight}	non-flight power requirement	±3%	0.3279	<1%
P_{solar}	solar cell output	±2%	-1.016	2%
\eta_p	motor+prop efficiency	±10%	-2.996	30%
\eta_{batt}	round-trip battery efficiency	±10%	-1.016	10%
\eta_{daylight}	winter daylight percentage	±10%	-1.016	10%
\eta_{sun angle}	average utilization from low sun angles	±10%	-1.016	10%
\rho	air density	±10%	-1.498	15%
\rho_{solar}	solar cell area density	±10%	1.514	15%
f_{struct}	structural weight fraction, m_struct/m_tot	±10%	1.124	11%
g	local earth gravity	±0%	4.494	0%
h_{batt}	battery specific energy	±10%	-2.308	23%
m_{pay}	payload mass	±50%	0.6721	33%
t_{batt}	time on battery	±50%	2.308	115%

[bqpd]

@whoburg, that's obviously a false table above, but might something like that be useful for prioritizing the turning of constants into models?

[bqpd]

It's not accurate for large uncertainties, but at least gives a sense of "oh hey we should model solar efficiency more accurately; let's take into account the air temperature"

[whoburg]

re: sensitivity table, love it!! This is exactly along the lines of what I've been thinking.