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Full-Text Articles in Mechanical Engineering
Airfoil Flow Optimized Control With An Upstream Cylinder, Nicole Steiner
Airfoil Flow Optimized Control With An Upstream Cylinder, Nicole Steiner
Fall Student Research Symposium 2021
The purpose of this research is to optimize the aerodynamic performance of an airfoil with an upstream cylinder by neural network artificial intelligence. The effects of an upstream oscillating cylinder on the aerodynamic performance of an airfoil are also studied. This paper reports the effects oscillating frequency of the cylinder and the Reynolds number on the lift/drag ratio of the airfoil. The frequency has a complicated correlation with the lift/drag ratio, while the Reynolds number is found to have a positive correlation with the lift/drag ratio. The optimized case is found to have a lift/drag ratio of 1.7319, which is …
Aerodynamic Centers Of Arbitrary Airfoils Below Stall, Douglas F. Hunsaker, Orrin D. Pope, Jeffrey D. Taylor, Josh Hodson
Aerodynamic Centers Of Arbitrary Airfoils Below Stall, Douglas F. Hunsaker, Orrin D. Pope, Jeffrey D. Taylor, Josh Hodson
Mechanical and Aerospace Engineering Student Publications and Presentations
The aerodynamic center of an airfoil is commonly estimated to lie at the quarter-chord. This traditional estimate is based on thin airfoil theory, which neglects aerodynamic and geometric nonlinearities. Even below stall, these nonlinearities can have a significant effect on the location of the aerodynamic center. Here, a method is presented for accurately predicting the aerodynamic center of any airfoil from known lift, drag, and pitching-moment data as a function of angle of attack. The method accounts for aerodynamic and geometric nonlinearities, and it does not include small-angle, small-camber, and thin-airfoil approximations. It is shown that the aerodynamic center of …
Aerodynamic Centers Of Arbitrary Airfoils, Orrin Dean Pope
Aerodynamic Centers Of Arbitrary Airfoils, Orrin Dean Pope
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The study of designing stable aircraft has been widespread and ongoing since the early days of Orville and Wilbur Wright and their famous Wright Flyer airplane. All aircraft as they fly through the air are subject to minor changes in the forces acting on them. The field of aircraft stability seeks to understand and predict how aircraft will respond to these changes in forces and to design aircraft such that when these forces change the aircraft remains stable. The mathematical equations used to predict aircraft stability rely on knowledge of the location of the aerodynamic center, the point through which …
Optimization Of A Low Reynold's Number 2-D Inflatable Airfoil Section, Todd A. Johansen
Optimization Of A Low Reynold's Number 2-D Inflatable Airfoil Section, Todd A. Johansen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A stand-alone genetic algorithm (GA) and an surrogate-based optimization (SBO) combined with a GA were compared for accuracy and performance. Comparisons took place using the Ackley Function and Rastrigin's Function, two functions with multiple local maxima and minima that could cause problems for more traditional optimization methods, such as a gradient-based method. The GA and SBO with GA were applied to the functions through a fortran interface and it was found that the SBO could use the same number of function evaluations as the GA and achieve at least 5 orders of magnitude greater accuracy through the use of surrogate …