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NONLINEARITY INDEX AIRCRAFT SPIN MOTION ANALYSIS WITH DYNAMIC INVERSION SPIN RECOVERY CONTROLLER ... more NONLINEARITY INDEX AIRCRAFT SPIN MOTION ANALYSIS WITH DYNAMIC INVERSION SPIN RECOVERY CONTROLLER DESIGN Je ry Walker Old Dominion University, 2020 Director: Dr. Brett Newman The aim of this thesis research is to extend the previous work of Tapolcai utilizing nonlinearity index theory to quantitatively analyze nonlinearities in an aircraft model and to augment these undesirable nonlinear characteristics with feedback control. In his work Tapolcai utilized a simpli ed rotational three degree of freedom model to analyze spin conditions of the F-18 High Angle-of-Attack Research Vehicle model. Through the application of nonlinearity index theory, regions of severe nonlinearity were uncovered exhibiting chaotic non-periodic behavior, periodic limit cycling, and instability. If these conditions were encountered during ight, the aircraft would exhibit undesirable response characteristics thereby requiring augmented control to safely operate. In this research the F-18 model is rst implemente...
NONLINEARITY INDEX AIRCRAFT SPIN MOTION ANALYSIS WITH DYNAMIC INVERSION SPIN RECOVERY CONTROLLER ... more NONLINEARITY INDEX AIRCRAFT SPIN MOTION ANALYSIS WITH DYNAMIC INVERSION SPIN RECOVERY CONTROLLER DESIGN Je ry Walker Old Dominion University, 2020 Director: Dr. Brett Newman The aim of this thesis research is to extend the previous work of Tapolcai utilizing nonlinearity index theory to quantitatively analyze nonlinearities in an aircraft model and to augment these undesirable nonlinear characteristics with feedback control. In his work Tapolcai utilized a simpli ed rotational three degree of freedom model to analyze spin conditions of the F-18 High Angle-of-Attack Research Vehicle model. Through the application of nonlinearity index theory, regions of severe nonlinearity were uncovered exhibiting chaotic non-periodic behavior, periodic limit cycling, and instability. If these conditions were encountered during ight, the aircraft would exhibit undesirable response characteristics thereby requiring augmented control to safely operate. In this research the F-18 model is rst implemente...