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Unformatted text preview: LTI Systems An aircraft can be considered a system, with the ﬂight control positions as the inputs, and the speed, altitude, etc., as the outputs. An aircraft is best modeled as 1. Linear and time invariant 2. Nonlinear and time invariant 3. Linear and time varying 4. Nonlinear and time varying 5. I don’t know Lecture S1 Concept Test LTI Systems Solution Lecture S1: LTI Systems 1 2 3 4 5 Answer 0 5 10 15 20 25 Number of Students This one is a little tricky, with more than one possible defensible answer. To begin, the system is nonlinear. If one increases the elevator deﬂection a small amount, the angle of attack of the wing will increase a little, thus increasing the lift a little. If the elevator angle is increased a lot, the angle of attack will increase a lot, causing the wing to stall, and the lift will decrease . Linearity requires that the lift increase in direct proportion to the elevator angle, no matter how large the elevator angle....
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This note was uploaded on 01/28/2012 for the course AERO 16.01 taught by Professor Markdrela during the Fall '05 term at MIT.
 Fall '05
 MarkDrela

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