Design of a Multivariable Tracker Control Law for the A-7D Digitac II Aircraft.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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This thesis uses the design procedures developed in an attempt to design a multivariable tracker control law for the A-7D Digitac II Aircraft. Some of the limitations and problems associated with this design procedure are uncovered in this study. A six degree-of-freedom aircraft model is developed and is then modified to a form that is required by the design procedure. The theory used for the design determines the necessary arrangement of the equations. A tracker control law is first designed for one flight condition. Then it is checked for robustness by applying the control law at a different flight condition and also by removing the rudder from the inputs. A design computer program called MULTI is developed to perform the computations and simulations. It is found that the design techniques are valid, but that they are not applicable to all systems. A problem occurs when the inputs, as with an aircraft, are bounded. Problems may also be encountered when the sensor and actuator models are incorporated into the design. Therefore, for this study, the sensor and actuator models are removed and approximated as unity.
- Numerical Mathematics
- Computer Programming and Software