sp_S10_mud

# sp_S10_mud - Lecture S10 Muddiest Points General Comments...

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Lecture S10 Muddiest Points General Comments Today, we mostly talked about an example using Laplace transforms. I didn’t get the algebra quite right — my apologies. I will post a set of notes that does the algebra correctly. Responses to Muddiest-Part-of-the-Lecture Cards (19 cards) 1. What’s the meaning of “gain”? (2 students) In the airplane control example, the control signal u ( t ) was formed by multiplying the error signal e ( t ) by a number, k . This number is called a “gain.” More generally, if the control block had been a transfer function K ( s ) rather than a static number, we would still call the magnitude of the transfer function K ( ) at each frequency ω the “gain” at that frequency. 2. Does the “vomit comet” (the NASA KC-135) use the phugoid mode to ﬂy its parabolic ﬂight path? (1) Not really. In a phugoid, the coeﬃcient of lift C L is constant. In the KC-135, the zero-g parabola is ﬂown at a lift coeﬃcient of zero, and the high-g

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sp_S10_mud - Lecture S10 Muddiest Points General Comments...

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