MAE142_Lecture22 - State Feedback Stability Augmentation...

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State Feedback Stability Augmentation F-16 SAS Design Yaw Damper Pitch SAS Full-State Feedback MAE 142 NASA Image
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2 MAE 142 Sensors Sensors are available to measure some, but not all, of the typical state variables used to describe vehicle motion. Angular rate gyros are readily available. Rate gyros directly measure roll rate (p), pitch rate (q), and yaw rate (r ) Inexpensive Micro-Electro-Mechnical (MEMs) devices are available for small-scale applications, but full-scale vehicles will use something more accurate and reliable. Air data systems measure airspeed and direction. Most air vehicles have a pitot-static system to measure airspeed (V). Angle-of-attack measurements are used for stall warning, but are not typically used for feedback control. Sideslip measurements are rarely used in commercial applications. Attitude Heading Reference Systems (AHRS) estimate Euler angles (phi, theta, psi).
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3 MAE 142 Stability Augmentation Systems (SAS) A Stability Augmentation System (SAS) is used to modify the basic stability characteristics of the vehicle. The SAS is considered an “inner loop” control system because it operates at a fast update rate and is basically transparent to the pilot/operator.
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