Results 41 to 50 of about 2,189 (208)

In-flight Lift and Drag Estimation of an Unmanned Propeller-Driven Aircraft

Aerospace, 2021
The high-power density and good scaling properties of electric motors enable new propulsion arrangements and aircraft configurations. This results in distributed propulsion systems allowing to make use of aerodynamic interaction effects between ...
Dominique Paul Bergmann, Jan Denzel, Ole Pfeifle, Stefan Notter, Walter Fichter, Andreas Strohmayer   +5 more
doaj   +1 more source

Ultrasonic Rainbow: A Meta‐Transducer for Frequency‐Selective Elastic Wave Control via Dithering‐Based Wavenumber Tuning

Advanced Intelligent Systems, EarlyView.
A piezoelectric meta‐transducer generates an ultrasonic rainbow, steering guided elastic waves to different angles according to frequency. A dithering‐based binary electrode design enables a closer realization of the target wavenumber filter, improving directional purity and suppressing unwanted lobes. Numerical and experimental validation demonstrates
Masoud Mohammadgholiha, Jochen Moll, Kilian Tschöke, Carsten Kruska, Sylvia E. Gebhardt, Luca De Marchi   +5 more
wiley   +1 more source

Sizing and Mission Profile Analysis of the Hybrid-Electric Propulsion System for Retrofitting a Fixed Wing VTOL Aircraft

International Journal of Aerospace Engineering, 2022
Hybrid-electric technology can be expected to improve the performance of fixed wing vertical takeoff and landing (VTOL) aircraft. In this paper, we demonstrated a method of retrofitting a single-energy propulsion system prototype with a hybrid-electric ...
Jianan Zong, Bingjie Zhu, Zhongxi Hou, Xixiang Yang, Jiaqi Zhai   +4 more
doaj   +1 more source

Medium-Range Aircraft Conceptual Design from a Local Air Quality and Climate Change Viewpoint

Energies, 2023
This paper presents an overall performance assessment of hybrid-electric medium-range transport aircraft, with the aim to evaluate the potential of such a propulsion technology towards the reduction in the environmental impact of aviation transport, in ...
Karim Abu Salem, Giuseppe Palaia, Alessandro A. Quarta, Mario R. Chiarelli   +3 more
doaj   +1 more source

Long‐Time Thermal Aging of Perfluoroalkoxy Polymers for Electrical Insulation: Structural and Physical Properties Evolutions

Journal of Applied Polymer Science, EarlyView.
This work focuses on the investigation of the influence of a long‐time exposition to accelerated thermal aging on the physicochemical structure and properties of PFA. Results show a decrease in the melting temperature and crystal ratio due to chemical aging.
Victor Henri, Julien Chedaille, Pierre Henrard, Eric Dantras   +3 more
wiley   +1 more source

Conceptual Feasibility Study of Integration of Aircraft With New Propulsion Technologies in Current Airline Flight Schedules

Aerospace Research Communications
Given the increasing importance of sustainability in the aviation industry, the integration of aircraft with new propulsion technologies that produce fewer, or no emissions is essential.
Ayodeji Clement Akinola, Jonas Ernst Bernhard Langner, Peter Hecker, Thomas Feuerle, Insa Degenhardt   +4 more
doaj   +1 more source

Flight of the dragons: a global review of migration in Odonata

Biological Reviews, EarlyView.
ABSTRACT Insects are the most abundant and ecologically important animal migrants. Yet, we know relatively little about the patterns and processes underlying insect migration. Dragonflies (Anisoptera) and damselflies (Zygoptera) comprise the ancient insect order Odonata, whose ancestors were the first organisms to fly on Earth.
Johanna S.U. Hedlund, Myles Menz, Jason W. Chapman, Alexander Hayward   +3 more
wiley   +1 more source

Research on SiC Speed Controller for High-Voltage Distributed Electric Propulsion System

International Journal of Aerospace Engineering
The shift towards green aviation necessitates the adoption of all-electric aircraft, marking an essential trend in the aviation industry. Distributed propulsion systems enhance aircraft flexibility and reliability, synchronously reducing performance ...
Labin Wang, Yunhan He, Yun Xu, Li Fan, Junhua Xiang   +4 more
doaj   +1 more source

Selection of a composition, operating process parameters and operating mode of propulsion for a supersonic cruising aircraft

Авіаційно-космічна техніка та технологія, 2021
The issues of choosing a composition, operating process parameters and operating modes of propulsion for supersonic cruising aircraft providing transoceanic flights are considered.
Михайло Анатолійович Шевченко
doaj   +1 more source

Corporate Decarbonization via Technology and Management

Business Strategy and the Environment, EarlyView.
ABSTRACT This study provides a comprehensive overview of key findings on decarbonization, advanced technologies, and management strategies, highlighting emerging themes shaping the field. Advanced technologies enhance carbon reduction through efficiency, real‐time monitoring, and optimizing resource optimization.
Heidy Montero‐Teran, Rudolf R. Sinkovics, Olli Kuivalainen   +2 more
wiley   +1 more source