MAE142_Lecture21

MAE142_Lecture21 - Parameter Variations Reference Changes...

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Parameter Variations Reference Changes Model Uncertainty Probability of Instability MAE 142 NASA Image
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2 MAE 142 Reference and Configuration Changes It is now possible to study how the linear model characteristics (such as stability) vary with reference conditions and configuration changes. Some typical investigations: Speed and/or altitude variations Wing sweep Weight variations (including store separation) Center-of-gravity or loading variations Landing gear deployment Solar panel or antenna deployment
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3 MAE 142 -2.5 -2 -1.5 -1 -0.5 0 0.5 -4 -3 -2 -1 0 1 2 3 4 -0.45 -0.4 -0.35 -0.3 -0.25 -0.2 -0.15 -0.1 -0.05 -3 -2 -1 0 1 2 3 F-16 Reference Change Compare the poles (eigenvalues) of linear models obtained in a level-flight and steady spinning reference conditions. Level Flight Reference Airspeed = 750 ft/s Mach = 0.73 Altitude = 25,000 ft Angle-of-Attack = 1.5 deg Elevator = -1.8 deg Thrust = 1738 lb Spin Reference Airspeed = 200 ft/s Mach = 0.73 Altitude = 25,000 ft Angle-of-Attack = 102 deg Sideslip = 15 deg Roll Rate = 10 deg/s
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This note was uploaded on 01/18/2012 for the course MAE 142 taught by Professor Aliseda,a during the Spring '08 term at UCSD.

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MAE142_Lecture21 - Parameter Variations Reference Changes...

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