The Application of Output Predictive Digital Control to Wing Flutter Suppression and Terrain Following Problems.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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This thesis is a study of a digital control technique known as Output Predictive Control OPC or Model Algorithmic Control MAC. In OPC, the behavior of the system is predicted using its impulse response function and the desired response is characterized by a reference trajectory. Controls are computed iteratively to drive the system output along the desired trajectory. In an earlier study, the system was made to follow the reference trajectory exactly, but only at the control application time there were large oscillations of the output between control changes. In this study, the control calculation is reformulated as a least squares curve fit problem, allowing some deviation from the desired trajectory. This approach is applied as a regulator for a very lightly damped fourth-order single-inputsingle-output system and as a pitch axis autopilot in a simplified terrain following problem. A qualitative discussion of the robustness properties is included. The design of the controller is difficult due to the interrelationships of the internal parameters however, the results of the terrain following example indicate that this is a viable approach for this problem. Author
- Fluid Mechanics