207 research outputs found
Air Transportation 2050 - A Holistic View
The lecture introduces into the view of holistic aerospace technology research. Starting at global aviation developments various research results on operational laminar technology imapct and climate optimized aircraft design are presente
Virtual Integration Platforms (VIP) âA Concept for Integrated and Interdisciplinary Air Transportation Research and Assessment
The paper descibes a new methodology for a holistic development of air transportation concepts. The Virtual Integration Plattform (VIP) concept is based on an IT tool chain as well as human collaborative methods to deal with complex systems. As a result the definitions of future air transportation concepts for short range "Quiet and Clean", long range "Comfortable and Clean" and individual transport "Fast and Flexible" are presente
Fliegen 2050
Es wird eine Ăbersicht ĂŒber die globalen Entwicklungen mit EinfluĂ auf die Luftfahrt gegeben. Im Hauptteil wird auf eine stĂ€rkere Prozessorientierung des Lufttransports eingegangen, um eine höhere Effizienz und AttraktivitĂ€t zu erzielen. Im weiteren Verlauf werden absehbare innovative Technologien sowie deren Potentiale aufgezeigt
Erweiterung eines Trajektorienrechners zur Nutzung meteorologischer Daten fĂŒr die Optimierung von Flugzeugtrajektorien
Das Fliegen wird maĂgeblich durch die Wind- und Wettersituation entlang des Flugweges beeinflusst. Vor diesem Hintergrund wurde das Trajectory Calculation Module (TCM) â ein bestehendes Werkzeug zur Simulation von Flugtrajektorien â dahingehend erweitert, dass im Zuge der Trajektoriensimulation anstelle von StandardatmosphĂ€ren-Bedingungen auch reale atmosphĂ€rische Bedingungen miteinbezogen werden können. HierfĂŒr wurden insbesondere eine Flughöhen- sowie eine Fluggeschwindigkeitsregelung integriert, die die Einhaltung typischer Flugphasenrandbedingungen auch unter von der StandardatmosphĂ€re abweichenden meteorologischen Bedingungen gewĂ€hrleisten. Die Wirkung horizontaler Winde wurde zudem durch deren Superposition mit der Fluggeschwindigkeit gegenĂŒber der Luft erfasst. Ferner wurde fĂŒr die laterale Optimierung von Flugrouten unter Windeinfluss ein Algorithmus auf Basis von Prinzipien der Optimalsteuerungstheorie entwickelt. Das zu minimierende Kostenfunktional wurde so gewĂ€hlt, dass sowohl die Flugzeit als auch der Einfluss einer ortsabhĂ€ngigen Straffunktion BerĂŒcksichtigung finden können. Als Anwendungsfall wurden Klimakostenfunktionen, die die SensitivitĂ€t der Klimawirkung gegenĂŒber der Emission von Schadstoffen als Funktion des Ortes beschreiben, als Straffunktion in das Kostenfunktional der Optimierung integriert. Auf dieser Grundlage wurde anhand einer exemplarischen Flugroute untersucht, inwieweit sich die durch den Flug verursachte Klimawirkung vermindern lieĂe, wenn eine erhöhte Flugzeit in Kauf genommen wĂŒrde
An Integrated Method for Determination of the Oswald Factor in a Multi-Fidelity Design Environment
Aircraft conceptual design often focuses on unconventional
configurations like for example forward
swept wings. Assessing the characteristics
of these configurations usually requires the use
of physic based analysis modules. This is due
to the fact that for unconventional configurations
no sucient database for historic based analysis
modules is available.
Nevertheless, physic based models require a
lot of input data and their computational cost can
be high. Generating input values in a trade study
manually is work-intensive and error-prone.
Conceptual design modules can be used to
generate sucient input data for physic based
models and their results can be re-integrated into
the conceptual design phase. In this study a direct
link between a conceptual design module
and an aerodynamic design module is presented.
Geometric information is generated by the conceptual
design module and the physic based results,
in form of the Oswald factor, are then fed
back.
Apart from the direct link, an equation for determination
of the Oswald factor is derived via a
Symbolic Regression Approach
Bewertung der Effizienz von Flugzeugen mit Hybridlaminarhaltung unter BerĂŒcksichtigung von WolkeneinflĂŒssen
Das Ziel dieser Arbeit ist es, die operationelle und ökonomische Effizienz von Flugzeugen mit Hybridlaminarhaltung zu bewerten. Im Vordergrund steht dabei die Frage, wie kritisch die Degradation der LaminaritĂ€t durch WolkeneinflĂŒge ist und welche GegenmaĂnahmen zur Minderung des Einsparpotenzialverlustes geeignet sind. Dazu wurden zwei Mittel-Langstreckenflugzeuge mit Hilfe von meteorologischen AtmosphĂ€rendaten des European Centre for Medium-Range Weather Forecast hinsichtlich ihrer Effizienz untersucht. Neben der Erstellung einer globalen und auf die Luftfahrt bezogenen Wolkenklimatologie wurden vom DLR entwickelte Tools zur Trajektoriensimulation genutzt, um das reale Einsparpotenzial von Flugzeugen mit Hybridlaminarhaltung unter BerĂŒcksichtigung unterschiedlicher Kraftstoffplanungsstrategien zu ermitteln. Zudem wurde eine Umgebung zur Trajektorienoptimierung verwendet, um die Frage zu beantworten, inwieweit und unter welchen Bedingungen alternative laterale StreckenfĂŒhrungskonzepte geeignet sind, um durch die Vermeidung von WolkendurchflĂŒgen die LaminaritĂ€tsdegradation zu vermindern und den ökonomischen Vorteil der Technologie zu maximieren
Assessment of real-time data transmission via ad-hoc communication networks in the North Atlantic oceanic airspace
Data link based real-time data transmission for air traffic services and aeronautical operational control provides for safe, efficient and timely exchange of information between aircraft and ground entities within the current air transportation system. This enables procedures and process optimization for air traffic service and airline
operational control. Currently, the air transport system relies on direct line-of-sight data link in continental airspace and communication via satellite or high frequency data link in oceanic, remote or polar airspace. Future communication technology intends to additionally allow for indirect air-to-ground communication via
aeronautical ad-hoc networks using aircraft as network nodes. This approach bears a high potential to increase airspace capacity and efficiency for congested airspaces with little ground infrastructure as it is the case e.g. for the North Atlantic oceanic airspace. While the assessment of operational benefits for conventional line-ofsight or satellite-based data link technologies can be based on the experience made with existing technologies, the assessment of aeronautical ad-hoc networks needs careful consideration of the particular air traffic situation as well as of the specific aeronautical communication demand. In our work we present a method to
combine air traffic and connectivity simulations with an aeronautical data traffic demand model for the North Atlantic oceanic airspace. As a result, the coverage of aeronautical data traffic demand by an aeronautical adhoc network enabled by the new technology, will be estimated for various scenarios for the North Atlantic oceanic airspace. Dependencies on the equipage fraction and on the air-to-air radio range will be analyzed. Also, expected application data rates at aircraft exchanging the data communication of the airborne network with ground entities, will be assessed on a simplified basis. The results are suited to serve as a technical guidance for further scaling and definition of the underlying air-to-air data link technology
Evaluation of business travel as a potential customer field of a local AAM market
Several studies examine Advanced Air Mobility
(AAM) demand focusing on commuting and airport shuttle trips
at this moment. Little activities are concentrating on business
travel in general nor for AAM demand in special. Business
travel as a generic term for any corporate purposed transport
consists of four categories: Meetings, Incentives, Conventions and
Exhibitions (MICE). Every business traffic comes along with
its own character which has to be considered when modelling.
After the transport generation based on their travel purpose
and location, a discrete choice model evaluates different modes
of transport to determine the market share for AAM. As business
travel is expected to have a greater value of time, the modal share
of AAM is anticipated be higher compared to more cost-sensitive
use cases such as commuting. On the other hand, however, the
market size of the overall business traffic could weaken this
group of potential AAM passengers. In the field of this poorly
investigated demand share, this approach presents a possibility of
modeling local business traffic. Furthermore, this study assumes
an adopted AAM mode of transport for this passenger group,
which helps to understand the characteristics of future AAM
demand
An aeronautical data communication demand model for the North Atlantic oceanic airspace
Information exchange via aeronautical data communication is of increasing importance for the communication between pilots and air traffic control, providing the basis for surveillance of aircraft in oceanic or remote airspaces, as well as enabling the communication between an airlinesâ fleet and its operational control. The aeronautical data communication that is being transmitted via data link encompasses, among others, surveillance-related aircraft position updates, clearances for flight path change requests, maintenance-related status reports, estimated arrival times and weather information in accordance with the required performance, that is set by technical standards. Aeronautical data communication events are driven by an aircraftâs flight phase, the current airspace or may occur in a randomized manner throughout the flight. As the usage of aeronautical data communication is expected to grow in future, ample data link technologies are being evaluated and developed. The usability and operational value of new data link technologies for aeronautical applications can be evaluated by applying suitable models of the respective data link communication pattern combined with operational simulations. Current models for aeronautical data communication demand support the design and evaluation of direct aircraft-to-ground communication networks. The geographical location of the data communication demand is secondary for these models, since coverage areas can be defined, where direct communication links are available. New data link technologies offer the opportunity of direct data transfer between aircraft and forwarding of messages from sending aircraft to a ground entity via ad-hoc communication networks between aircraft. This is of special interest for the North Atlantic oceanic airspace, an airspace with high traffic density and little ground infrastructure, where communication currently relies mostly on satellite-based systems. For these airborne ad-hoc networks the definition of coverage areas around ground or space-based entities is not possible. To assess the new data link technology a model for aeronautical data link communication demand is needed, that accounts for operationally derived communication events such as handover procedures at boundaries of oceanic control areas or status reports at route-specific waypoints, which cause an accumulation in certain geographical regions that pose a challenge to the dynamic connectivity coverage of aeronautical ad-hoc networks. Addressing this issue, we present a new modelling approach for air traffic service communication that considers the operational context of the simulated airspace and provides a geospatial data communication demand distribution, which is derived from air traffic management procedures, airspace geometries and events inherent to each flight path. The air traffic service communication is then validated based on 2019 air traffic and performance monitoring data provided by ICAO supplemented by an existing model for communication related to airline operational control. In a next step, the communication demand per area in the North Atlantic Oceanic airspace is being assessed. The aeronautical data traffic model shows deviations of less than one message per aircraft and airspace when compared to recorded data traffic from 2019 for two key services in the most frequented North Atlantic oceanic control areas. Therefore, it is assumed to be suitable for the evaluation of network-based data link technology and operational impact assessments
Investigation on the effects of weather patterns on strategic climate impact mitigation measures: a data-based approach
Aviation plays a crucial role in global transportation, but its environmental impact, particularly its contribution to climate change, remains a significant concern. Besides CO2-emissions from aircraft, recent research has highlighted the substantial impact of non-CO2 effects. These effects, encompassing various atmospheric phenomena, demonstrate a complex relationship with time, location of emission, and prevailing atmospheric conditions along aircraft trajectories. This research aims to develop a database of climate sensitivity to discern the factors influencing these aviation emission effects, thereby enabling the determination of operational measures on fleet level.
The research focuses on key meteorological parameters and algorithmic climate change functions (aCCFs), considering a multitude of atmospheric phenomena, which are known to significantly influence climate impact of aviation [Castino et al, 2022]. By gathering extensive meteorological data from the European Centre for medium weather range forecast (ECMWF), and processing it by means of the CLIMaCCF library [DietmĂŒller et. al 2022] we can derive patterns and associations to identify areas particularly sensitive to non-CO2 emissions and their effects by applying algorithmic climate change functions that allow for a fast computation of aviation related temperature response to specific emission species. This data-driven approach allows us to understand the intricate interplay between aircraft emissions, atmospheric conditions, and the resulting climate forcing in terms of average temperature response (ATR).
The development of this meteorological database provides a valuable resource for assessing the environmental implications of air traffic operations. This study is focused on enabling climate mitigation through operational changes on a large traffic scenario compared to previous studies [LĂŒhrs et al 2021] to derive relevant strategic mitigation measures in ATM. This data-based approach is a conceptual study to identify the potential of using aCCFs for the determination of strategic measures in flight planning to mitigate climate impact focused on the European Civil Aviation Conference (ECAC)
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