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Post by Kämpfer on Apr 4, 2008 2:56:02 GMT -5
So what I never understood is why there are so many people out at 3am, but by 5am it looks like a desert wasteland out there. I mean there are people in restaurants, cars on the road, and Angell Hall is bustling but in 2 hours it will all just be a memory. What the hell was I thinking agreeing to sub at 3am? What I really don't get is the people that work with me never actually seem to leave. Thomas is sitting here surrounded by food and energy drinks every morning. Benjamin sleeps in the breakroom and I've never actually seen him leave. Even Sakif, who I'm subbing for, is back there in a corner. I mean what the hell kind of place is this? lol
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Post by Kämpfer on Apr 4, 2008 4:50:23 GMT -5
I'm bored & hungry (I always forget to bring food on the late night shifts). I have an exam in a couple hours and don't really want to study....  |
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Post by Kämpfer on Apr 4, 2008 11:12:57 GMT -5
Well the good news is I did get some studying in. The bad news is that pretty much nothing I studied was on the exam. Based on the time distribution in class and last semester's exam I was sure there would be a question on adverse rudder roll and aileron yaw, but instead there was nothing. The another huge thing I was expecting was some sort of Bode plot and frequency response of an aircraft, instead all I got was an essay question on eigenvalues and an aircraft's phugoid mode. What I did get was a crazy ass linearization problem, a terminal velocity problem taken verbatim from the first exam, an initial frequency question given a sinusoidal input and harmonic steady state output, and eigenflight. I'm pretty sure my plane crashed, I think I just failed Flight Dynamics and Control. |
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Post by Kämpfer on Apr 4, 2008 11:36:18 GMT -5
Actually, we'll hold off on a verdict here. I was actually really, really close to the right answers for all of them. We'll see how he actually grades. Pretty much had this been an open notes/calculator exam I think I would have aced it. For those of you who know something of differential equations and harmonic systems you might appreciate my errors. I think I should get extra credit for being able to tell exactly what I did wrong within 15minutes of handing it in.
Instead:
1) I screwed up the partial fractions converting the transfer function[tf] to steady state[ss] for the terminal velocity. My tf was right but in time domain the answer looks like A*exp(-t)+B*sin(wt) instead of something like C*exp(-t)*sin(wt).
2) Incorrectly evaluated Phi[roll angle] as zero at steady flight conditions (I'm not actually sure if that one is wrong). Can you roll and maintain steady flight? It might go either way.
3) Accidentally said G[tf]=M[Gain]/(T[Time Const.]*s-1) instead of s+1 (here the difference in time domain is essentially exp(t/T) instead of exp(-t/T) or the problem becomes infinite instead of decaying to zero) for the harmonic steady state solution
4) We'll see how that bs essay goes. If he can even read it.
So how many points do you think I lose for those? lol
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