gambit
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Feedback is constant and it is actually the physical displacement of the surface.I was under the impression that if the plane is dynamically stable (using FBW), you're actually less likely to experience any feedback from the control surfaces as the computer will constantly try to get the damping ratio close to zero.
http://hydraulicspneumatics.com/200/FPE/Sensors/Article/False/6440/FPE-Sensors
There are two ways to do this.A position transducer typically consists of two fundamental parts. One part remains fixed in position while the other part moves with the mechanism whose displacement is being measured. The exact nature, and therefore the size, of the fixed and moving portions depend on the sensing technology being used. Some transducers are intended to be mounted integrally to the mechanism, while others are designed to be mounted externally.
The linear version would be inside the hydraulic actuator. The rotary version would be closer to the flight control surface itself. Using the rear horizontal stab for example, the rotary transducer would be mounted right at the fuselage mount. Most designs uses the integrated hydraulics linear version.
The feedback is not anything anomalous. The stability augmentation (stabaug) loop must know how much a flight control surface actually displaced in order to calculate the corrected final displacement command.
Look at it this way...The flight control surface moves and its physical travels is constantly monitored. If it over traveled, it will be immediately corrected. The entire correction process is transparent to the pilot.