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Full-Text Articles in Aerospace Engineering
Numerical Studies Of Transition For Flows Around Multi-Element Airfoils, Fengjun Liu
Numerical Studies Of Transition For Flows Around Multi-Element Airfoils, Fengjun Liu
Dissertations
The transition of flows around a multi-element airfoil has been numerically studied using RANS with a k - e two-equation transition model, LST and DNS. The transition model uses an effective eddy-viscosity by coupling an intermittence-like correction to a turbulence eddy-viscosity that can be obtained via solving a parent k - e turbulence model. The transition model is truly predictive in that it is able to predict transition onset locations without having to specify prior knowledge of the targeted transition process. The predicted transition onset locations for all the cases studied were compared with the measured data. The results suggest …
Systematic Methods For The Design Of A Class Of Fuzzy Logic Controllers, Saad Y. Yasin
Systematic Methods For The Design Of A Class Of Fuzzy Logic Controllers, Saad Y. Yasin
Dissertations
Fuzzy logic control, a relatively new branch of control, can be used effectively whenever conventional control techniques become inapplicable or impractical. Various attempts have been made to create a generalized fuzzy control system and to formulate an analytically based fuzzy control law. In this study, two methods, the left and right parameterization method and the normalized spline-base membership function method, were utilized for formulating analytical fuzzy control laws in important practical control applications. The first model was used to design an idle speed controller, while the second was used to control an inverted control problem. The results of both showed …