Results 31 to 40 of about 6,631,530 (188)

Some Peculiarities of Helicopter Main Rotor Aeroacoustic for Far-Field Observer [PDF]

EPJ Web of Conferences, 2019
Mathematical models for helicopter rotor acoustics are usually based on the Ffowcs Williams–Hawkings (FW–H) equation. The level of rotor noise is determined by geometry (thickness noise) of a flying vehicle and distributed blade loading (loading noise ...
Kusyumov Alexander, Mikhailov Sergey, Kusyumov Sergey, Romanova Elena, Barakos Georgios   +4 more
doaj   +1 more source

GARTEUR Helicopter Cooperative Research [PDF]

, 2010
This paper starts with an overview about the general structure of the Group for Aeronautical Research and Technology in EURope (GARTEUR). The focus is on the activities related to rotorcraft which are managed in the GARTEUR Helicopter Group of ...
Pahlke, Klausdieter
core  

Evaluation of ADS-33E Cargo Helicopter Requirements Using a CH-53G [PDF]

, 2006
Flight tests with a Sikorsky CH 53G of the German Federal Armed Forces were conducted in Germany under the U.S./German Memorandum of Understanding (MoU) for Cooperative Research in Helicopter Aeromechanics to evaluate the cargo helicopter requirements of
Blanken, Chris L., Strecker, Gerhard, Höfinger, Marc   +2 more
core  

GENERATION OF AN ADVANCED HELICOPTER EXPERIMENTAL AERODYNAMIC DATABASE [PDF]

, 2009
The GOAHEAD-consortium was created in the frame of an EU-project in order to create an experimental database for the validation of 3D-CFD and comprehensive aeromechanics methods for the prediction of unsteady viscous flows including rotor dynamics for ...
Sheng, W., de Groot, Klaus, van der Wall, Berend G., Gibertini, G., Seraudie, A., Raffel, Markus, de Gegorio, Fabrizio   +6 more
core  

CHANCE: A FRENCH-GERMAN HELICOPTER CFD-PROJECT [PDF]

, 2006
The paper gives an overview of the CHANCE research project (partly supported by the French DPAC and DGA and the German BMWA) which was started in 1998 between the German and French Aerospace Research Centres DLR and ONERA, the University of Stuttgart and
Pahlke, Klausdieter, Costes, Michel, Castellin, Christophe, Altmikus, Andree, D'Alascio, Alessandro   +4 more
core  

Design of Unmanned Helicopter Distributed Electric Tail Rotor Controller Based on Improved Active Disturbance Rejection Control

IEEE Access
In response to the critical implications of single tail rotor failures in unmanned helicopters, this study proposes a distributed electric tail rotor yaw channel controller that employs Active Disturbance Rejection Control (ADRC) techniques.
Qing-Xin Zhang, Yun-Feng Ji, Feng Wang, Lei Pei, Zheng-Ming Cha   +4 more
doaj   +1 more source

Numerical study of helicopter airframe aerodynamics combined with coaxial main rotor using the URANS method

Научный вестник МГТУ ГА
The work is dedicated to numerical modeling of Kamov Ka-226 helicopter aerodynamics for isolated helicopter airframe and helicopter airframe with coaxial main rotor.
S. G. Konstantinov, P. V. Makeev, A. I. Shomov   +2 more
doaj   +1 more source

Sand Ingestion Behavior of Helicopter Engines During Hover in Ground Effect

Aerospace
Sand ingestion exerts significant effects on the performance of helicopter engines, and it is imperative to investigate this phenomenon. In this study, the mechanisms of engine sand ingestion during helicopter hover in ground effect are analyzed. Firstly,
Qiang Li, Linghua Dong, Changxin Song, Weidong Yang   +3 more
doaj   +1 more source

Low-Cost Data Acquisition Unit for Flight Tests

Fatigue of Aircraft Structures, 2019
The purpose of this paper is to present the design of a data recorder for flight tests of a full-scale aircraft and an UAV. The recorder is built based on the Arduino microprocessor platform and LabVIEW development environment.
Morawski Błażej, Głowacki Dominik, Głowacka Anna   +2 more
doaj   +1 more source

Graz Reading Comprehension Test

, 2023
Der GraLeV ist ein Verfahren zur Messung des Leseverständnisses (auf Wort-, Satz- und Textebene) von Kindern der dritten und vierten Schulstufe. Er besteht aus 4 Subtests mit insgesamt 38 Itemsets. Der GraLeV weist eine interne Konsistenz von Cronbachs α
Riedl, S., Wohlhart, D., Paleczek, L., Seifert, S., Franz, A.   +4 more
core   +1 more source