Results 251 to 260 of about 5,447,507 (295)

The Aerodynamic Efficiency of Windmills

Aeronautical Quarterly, 1978
SummaryThe paper reproduces the results of an earlier report on the vortex theory of windmills and follows that theory through to establish the aerodynamic design procedure for a horizontal axis windmill. The results are shown to differ considerably from those given in a recent paper by Griffith and the differences are explained. The main conclusion is
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An Investigation Into the Aerodynamic Efficiency of Tailles Aircraft

47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition, 2009
From the perspective of aerodynamics, tailless aircraft are defended by many as potentially the most efficient aircraft configuration. The supporting argument being that the reduced surface area resulting from the tailless configuration directly results in reductions in drag.
Aliya Valiyff, Maziar Arjomandi
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Time-Efficient Hardware-in-the-Loop Aerodynamic Optimization [PDF]

Journal of Aerospace Engineering
A hardware-in-the-loop system was created for the purpose of aerodynamic optimization. The system was used for fully independent optimization of an automotive diffuser model in a wind tunnel, with linear actuators used to modify the geometry. The model had three degrees of freedom with 7×105 possible configurations.
Pawel Kekus-Kumor, David Angland
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AeroINR: Meta-learning for Efficient Generation of Aerodynamic Geometries [PDF]

Effective optimisation of aerodynamic shapes requires high-quality parameterisation of candidate geometries. In recent years, the increasing availability and applicability of data - through increasing computational power, GPUs, cloud storage and AI - has motivated the development of data-driven approaches to the parameterisation problem, particularly ...
Tom Bamford, David Toal, Andy J. Keane
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Efficient Aerodynamic Optimization of Aircraft Wings

2018
Multidisciplinary design and optimization is a promising methodology for the efficient design of complex systems, in particular when it combines coupled analyses with gradient-based optimization techniques. In this case, it requires the derivatives evaluation of the functions of interest with respect to the design variables, which is the most demanding
Pedro M. V. Rodrigues, André C. Marta
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Improving the efficiency of aerodynamic shape optimization

AIAA Journal, 1994
The paper demonstrates two new improvements for the design procedure that increase the computational efficiency of an aerodynamic shape optimization procedure. The numerical procedure is based on discrete sensitivity analysis to compute the design gradient information as opposed to the traditional finite difference approach.
Burgreen, Greg W., Baysal, Oktay, Eleshaky, Mohamed E.   +2 more
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Estimating the Efficiency of an Aerodynamic Foam Breaker

Theoretical Foundations of Chemical Engineering, 2001
An expression for the jet outflow velocity (dynamic characteristic of the foam breaker) and the related effective diameter of a destructurized foam bubble is derived from the energy balance in the interaction of the gas jet and foam structure. An analysis of the jet outflow hydrodynamics gives an expression for the volumetric injection rate as a ...
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Aerodynamics and Other Efficiencies in Transporting Goods

2004
Recognizing both the pollution effects of fuel use and the likely increases of fuel cost in coming decades puts high priority on alternative energy for trucks, buses and trains. There are still gains available in decreasing aerodynamic drag and rolling friction, using efficient engines, and minimizing fuel waste, but it is appropriate to explore ...
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An Efficient Method for Aerodynamic Shape Optimization

10th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, 2004
We present simultaneous pseudo-timestepping as an efficient method for aerodynamic shape optimization. In this method, instead of solving the necessary optimality conditions by iterative techniques, pseudo-time embedded nonstationary system is integrated in time until a steady state is reached. The main advantages of this method are that it requires no
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Review of deep learning-based aerodynamic shape surrogate models and optimization for airfoils and blade profiles

The Physics of Fluids
In recent years, deep learning technology has developed rapidly and has shown great potential in the optimization of complex systems. In aerodynamic shape optimization, traditional computational fluid dynamics and experimental methods are limited due to ...
Xiaogang Liu, Sheng Yang, Haifeng Sun, Zhongyi Wang, X. Guan, Yuanqi Gu, Yuhang Wang   +6 more
semanticscholar   +1 more source