Results 221 to 230 of about 206,715 (238)

Evaluation of Impulse Response Functions for Convolution Integrals of Aerodynamic Forces by Optimization With a Penalty Function

Journal of Engineering Mechanics - ASCE, 2012
AbstractThis paper presents a new algorithm for evaluating impulse response functions for the convolution integrals of the aerodynamic forces of bridge decks. The impulse response functions formed by measured flutter derivatives are modified to satisfy causality conditions through optimization.
Ho-Kyung Kim, Hae Sung Lee
exaly   +2 more sources

EBF Noise Suppression and Aerodynamic Penalties

16th Aerospace Sciences Meeting, 1978
Acoustic tests were conducted at model scale to determine the noise produced in the flyover and sideline planes at reduced separation distances between the nozzle exhaust plane and the flaps of an under-the-wing (UTW) externally blown flap (EBF) configuration in its approach attitude.
exaly   +2 more sources

3D Ice Accretion and Aerodynamic Penalties Prediction on Aircraft

16th AIAA Computational Fluid Dynamics Conference, 2003
Fabien Dezitter
exaly   +2 more sources

An Experimental Study on Ice Accretion Characteristics and Icing-Induced Aerodynamic Penalties to Offshore Wind Turbines

Renewable Energy
Hu, Hui, Haiyang Hu, Harsha Sista
exaly   +2 more sources

Adjoint-based aerodynamic drag minimisation with trim penalty

The Aeronautical Journal, 2021
AbstractThe aerodynamic performance of conventional aircraft configurations are mainly affected by the wing and horizontal tail. Drag reduction by shape optimisation of the wing, while taking into account the aircraft trimmed constraint, has more benefit than focusing solely on the wing.
openaire   +1 more source

Aerodynamic Loss Penalty Produced by Film Cooling Transonic Turbine Blades

Journal of Engineering for Gas Turbines and Power, 1984
Aerodynamic loss measurements are presented for a state-of-the-art film cooled transonic gas turbine rotor blade tested in a two-dimensional cascade. A mixture of carbon dioxide and air, which correctly simulated engine coolant-to-mainstream density ratio and blowing rate, was ejected from each of five individual cooling hole rows in the aerofoil ...
B. R. Haller, J-J Camus
openaire   +1 more source

Comment on "Aerodynamic Penalties of Heavy Rain on Landing Airplanes"

Journal of Aircraft, 1984
I an interesting paper, Haines and Luers have discussed the aerodynamic penalties of heavy rain on aircraft. However, they have not mentioned one possible beneficial effect of rain: the ingestion of rain by the aircraft engines, leading to thrust augmentation.
openaire   +1 more source

A review of ice accretion on rotary-wing UAV propellers: scaling constraints, aerodynamic penalties, methodological challenges and mitigation strategies

The Aeronautical Journal
Abstract Atmospheric icing poses a disproportionate hazard to rotary-wing unmanned aerial vehicles (RW-UAVs) because their small-chord, high-RPM propellers operate in a low-Reynolds-number regime where even modest ice roughness and accretion can trigger severe aerodynamic, energetic, and flight-dynamic penalties.
Ahmet Dalkın, Hamdi Ercan, Muhsin Uğur Doğan   +2 more
openaire   +1 more source

Reducing the rotor–airframe aerodynamic penalty of a quadcopter through pressure-informed topology synthesis: computational design and paired flight-test assessment

The aerodynamic interaction between rotors and airframes can add drag and pitching-momentpenalties in small multirotor vehicles. This study evaluates a pressure-informed topologysynthesis workflow for locally redesigning the rotor-affected arms of a quadcopter. A hoverCFD pressure field was inverted and applied as a pseudo-load to a structural topology
Mustafa Alperen Hündür, Serkan Demir, Ibrahim Basar Aka   +2 more
openaire   +1 more source

Adjoint-Based Aerodynamic Drag Minimisation With Trim Penalty

Aeronautical Journal, 2022
Shlomy Shitrit
exaly