CEAS Aeronautical Journal

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Two-stage leak detection in vacuum bags for the production of fibre-reinforced composite components
CEAS Aeronautical Journal - Tập 10 - Trang 885-892 - 2019
A. Haschenburger, C. Heim
The increasing application of fibre-reinforced composite components in aviation results in new problems in production when compared to the conventional production of components from aluminium alloys. For instance, the existence of leakages in the vacuum bag can substantially impact the component quality. A significant increase of both time and cost, and even the rejection of the entire component a...... hiện toàn bộ
Energy optimal 3D flight path planning for unmanned aerial vehicle in urban environments
CEAS Aeronautical Journal - - 2023
Hannes Rienecker, Veit Hildebrand, Harald Pfifer
AbstractThis paper presents a general approach to compute energy optimal flight paths for unmanned aerial vehicle (UAV) in urban environments. To minimize the energy required, the flight path is optimized by exploiting local wind phenomena, i.e., upwind and tailwind areas from the airflow around buildings. A realistic wind field of a model urban environment typical...... hiện toàn bộ
Experimental investigation of UAV rotor aeroacoustics and aerodynamics with computational cross-validation
CEAS Aeronautical Journal - - Trang 1-16 - 2023
Anna A. Kostek, Felix Lößle, Robin Wickersheim, Manuel Keßler, Ronan Boisard, Gabriel Reboul, Antonio Visingardi, Mattia Barbarino, Anthony D. Gardner
The study provided a base of comparison of known computational techniques with different fidelity levels for performance and noise prediction of a single, fixed-pitch UAV rotor operating with varying flight parameters. The range of aerodynamic tools included blade element theory, potential flow methods (UPM, RAMSYS), lifting-line method (PUMA) and Navier–Stokes solver (FLOWer). Obtained loading di...... hiện toàn bộ
Numerical and experimental study of aerosol dispersion in the Do728 aircraft cabin
CEAS Aeronautical Journal - Tập 14 - Trang 509-526 - 2023
D. Schmeling, A. Shishkin, D. Schiepel, C. Wagner
The dispersion of aerosols originating from one source, the ‘index’ passenger, within the cabin of the aircraft Do728 is studied experimentally using an aerosol-exhaling thermal manikin and in Reynolds-averaged Navier–Stokes simulations (RANS). The overall aim of the present study is the experimental determination of the aerosol spreading for the state-of-the-art mixing ventilation (MV) and to eva...... hiện toàn bộ
Assessment of hydrogen transport aircraft
CEAS Aeronautical Journal - Tập 13 - Trang 813-845 - 2022
G. Onorato, P. Proesmans, M. F. M. Hoogreef
Zero-carbon-dioxide-emitting hydrogen-powered aircraft have, in recent decades, come back on the stage as promising protagonists in the fight against global warming. The main cause for the reduced performance of liquid hydrogen aircraft lays in the fuel storage, which demands the use of voluminous and heavy tanks. Literature on the topic shows that the optimal fuel storage solution depends on the ...... hiện toàn bộ
Numerical simulation of wave propagation using spectral finite elements
CEAS Aeronautical Journal - - 2013
B. Hennings, Rolf Lammering, Ulrich Gabbert
Investigation of biogenic materials and ferroelectrets for energy harvesting on vibrating aircraft structures
CEAS Aeronautical Journal - Tập 12 - Trang 331-344 - 2021
H. Holzmann, M. Weber, Y. J. Park, S. Perfetto, H. Atzrodt, A. Dafnis
In this publication the application of novel piezoelectric materials for energy harvesting on vibrating aircraft structures is investigated. These materials have significant advantages over conventional piezoelectric transducer materials like piezoceramics. In particular, biogenic materials in the form of wood-based materials and ferroelectrets in the form of irradiation cross-linked polypropylene...... hiện toàn bộ
Airport capacity constraints: future avenues for growth of global traffic
CEAS Aeronautical Journal - Tập 2 - Trang 21-34 - 2011
Johannes Reichmuth, Peter Berster, Marc C. Gelhausen
Current air traffic forecasts are mainly based on the hypothesis that airports have ample capacity to accommodate future growth, or, if this is not the case, that increasing airport capacity more than marginally is possible within an acceptable time frame. Improving airport capacity more than marginally usually means adding new runways; however, especially in highly developed countries, this may t...... hiện toàn bộ
Applying Eigenstructure Assignment to Inner-Loop Flight Control Laws for a Multibody Aircraft
CEAS Aeronautical Journal - Tập 13 Số 1 - Trang 33-43 - 2022
Alexander Köthe, Robert Luckner
AbstractUnmanned aircraft used as high-altitude platform system has been studied in research and industry as alternative technologies to satellites. Regarding actual operation and flight performance of such systems, multibody aircraft seems to be a promising aircraft configuration. In terms of flight dynamics, this aircraft strongly differs from classical rigid-bod...... hiện toàn bộ
Verification of a chamberless HLFC design with an outer skin of variable porosity
CEAS Aeronautical Journal - Tập 12 - Trang 835-845 - 2021
T. Kilian, M. Horn
A chamberless HLFC leading edge segment featuring an outer skin with variable porosity has been designed, manufactured and wind tunnel tested under flight Reynolds-number conditions. The aerodynamic design involved the extention of current HLFC design routines to variable pressure loss characteristics of the outer skin. Advanced options for structural design and manufacturing solutions with focus ...... hiện toàn bộ
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