stability and agumentation.pdf

In the evolution of aircraft feedback control system

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in the evolution of aircraft feedback control system was control augmentation systems (CAS). With a CAS, a pilot stick input is provided to the flight control system in two ways through the mechanical system through the CAS electrical path. The CAS design eliminated the SAS problem of pilot inputs being opposed by the feedback loop. Aircraft such as the A-7, F-111, F-14, and F-15 have CAS
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A-7 D/E Corsair II F-111 Aardvark Medium Tactical/ Strategic Bomber Grumman F-14 McDonnell Douglas F-15
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Simplified CAS
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Additional reliability was designed into CAS so that the control authority could be increased (to approximately 50%). With a CAS, the aircraft dynamic response is typically well-damped , and control response is scheduled with the control system gains to maintain desirable characteristics throughout the flight envelope. CAS provided dramatic improvements in aircraft handling qualities . Both dynamic stability and control response characteristics could be tailored and optimized to the mission of the aircraft.
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Fly by wire system
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Based on the excellent handling qualities achieved with CAS, the next logical step in feedback control systems development was to remove the mechanical control system and provide the CAS full authority . Such
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  • Winter '17
  • La marmora
  • Control Augmentation Systems

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