Inst. Luft- und Raumfahrt

59 Items

Recent Submissions
Aeroakustische Auslegung von Triebwerksfans mittels multidisziplinärer Optimierungen

Jaron, Robert (2018)

Fan noise is the dominant noise source in modern aircraft engines with high bypass ratios. Therefore the consideration of the noise reduction during the design of a fan stages becomes more and more important. In state-of-the-art design processes of fan stages the aerodynamic performance and the mechanical stability is automatically optimized by means of numerical simulations of the parametrized...

Manual flying and energy awareness

Müller, Simon ; Schreiter, Karolin ; Luckner, Robert ; Manzey, Dietrich (2017)

In order to enable pilots to better maintain energy awareness and energy management in manual flight, a new concept has been proposed, which transfers the demand control principle of fly-by-wire control laws also to the control of thrust. It includes a total-energy-related augmented thrust controller combined with a modified cockpit instrumentation enriched by specific energy displays. In order...

Enhancing manual flight precision and reducing pilot workload using a new manual control augmentation system for energy angle

Schreiter, Karolin ; Müller, Simon ; Luckner, Robert ; Manzey, Dietrich (2017)

With rising demands on flight precision and more complex flight trajectories, pilots' workload during manual flight is increasing. This is especially the case for thrust and spoiler control during approach and landing. The presented nxControl system enables pilots to manually control the longitudinal load factor nx instead of engine parameters and spoiler deflections. This load factor is equiva...

Demand control law for total energy angle tested at manual steep approaches

Schreiter, Karolin ; Müller, Simon ; Luckner, Robert ; Manzey, Dietrich (2018)

With rising demands on flight precision and more complex flight trajectories, pilots' workload during manual flight is increasing. This is especially the case for flight path and speed control with thrust and spoilers during approach and landing. The objective of the nxControl system is to enable pilots to manually control the longitudinal load factor nx instead of engine parameters and spoiler...

Untersuchung der mentalen Repräsentation von Energiemanagement bei der Flugzeugführung zur Entwicklung eines Pilotenassistenzsystems

Müller, Simon ; Manzey, Dietrich ; Bleyer, Anne ; Schreiter, Karolin ; Voigt, Anja ; Luckner, Robert (2013)

Um die mentale Repräsentation des Energiemanagements bei der manuellen Flugzeugführung zu untersuchen, wurde eine Simulatorkampagne mit n = 12 lizenzierten Verkehrspiloten durchgeführt. Ihre Aufgabe war es, künstlich generierte Höhen- und Geschwindigkeitsablagen auf dem Gleitpfad des Instrumentenlandesystems (ILS) im Endanflug zu korrigieren. Dabei wurde untersucht, ob und inwiefern sie von dem...

nxControl instead of pitch-and-power

Schreiter, Karolin ; Müller, Simon ; Luckner, Robert ; Manzey, Dietrich (2014)

A command system for manual control of the longitudinal load factor (nx) of an aircraft is designed that completes existing flight control command systems (e.g. sidesticks normal load factor nz). nxControl's aim is to assist pilots during manual flight by reducing the workload for monitoring flight parameters and the controlling of thrust and airbrakes. Important for nxControl concept is the di...

Simulatorstudie zur Ermittlung mentaler Handlungsmodelle von Piloten beim Energiemanagement

Müller, Simon ; Schreiter, Karolin ; Manzey, Dietrich (2013)

Im Rahmen des Forschungsprojektes "nxControl" wurde eine Simulatorstudie mit zwölf lizenzierten Verkehrspiloten zur Ermittlung mentaler Handlungsmodelle beim Energieabbau durchgeführt. Die Aufgabe der Piloten war es, drei Sink- und drei Landeanflüge mit variierten Randbedingungen zu absolvieren. Anhand der Versuchsergebnisse sollen Empfehlungen für die pilotenzentrierte Entwicklung eines Assist...

nxControl instead of pitch-and-power: a concept for enhanced manual flight control

Müller, Simon ; Schreiter, Karolin ; Manzey, Dietrich ; Luckner, Robert (2016)

A command system for manual control of the longitudinal load factor in flight path direction of an aircraft is designed that completes existing flight control command systems (e.g. with sidesticks that command normal load factor). The system is called nxControl. It aims to assist pilots during manual flight by reducing the workload for monitoring flight parameters as well as for controlling thr...

Verbesserung von Flugpräzision und Arbeitsbeanspruchung bei manuellen RNP-Anflügen durch Vorgaberegler und Anzeigen für den Energiewinkel (nxControl)

Schreiter, Karolin ; Müller, Simon ; Luckner, Robert ; Manzey, Dietrich (2016)

Mit steigenden Präzisionsanforderungen bei immer komplexeren Flugtrajektorien erhöht sich die Arbeitsbeanspruchung der Piloten im manuellen Flug besonders bei der Ansteuerung von Triebwerken und Bremsklappen. Die konventionelle Steuerung über Hilfsparameter wie Triebwerksdrehzahl bzw. Hebelstellung erlaubt keine exakte Vorhersage der Zustandsänderung. Stattdessen muss abgewartet und die Eingabe...

nxControl: Konzept zur Vorgaberegelung für die Längsbeschleunigung des Flugzeugs

Schreiter, Karolin ; Müller, Simon ; Luckner, Robert (2013)

Der zukünftige Luftverkehr erfordert präzisere Einhaltung von komplexeren Trajektorien. Automatische Flugführung mittels Autopilot und Autothrottle erlauben bereits heute die Einhaltung komplexer Flugtrajektorien. Jedoch muss stets gewährleistet sein, dass die Piloten die erhöhten Anforderungen an die Bahnführung auch im manuellen Flug erfüllen können. Moderne Verkehrsflugzeuge sind mit elektro...

Auslegung und Validierung der Leistungsfähigkeit eines GBAS-CAT-II/III-L1-Bodensubsystems

Schüttpelz, André (2018)

Die vorliegende Arbeit behandelt die Auslegung und Validierung der Leistungsfähigkeitmeines Bodensubsystems zur Unterstützung satellitengestützter mit Präzisionsanflüge und Landungen mit bodengestützter Erweiterung (GBAS). Sie verfolgt das Ziel, die Reife der Technologie zur Durchführung von Präzisionsanflügen bis CAT-IIIb mit erweitertem Betriebskonzept zur reduzierten Staffelung während des...

Physics of prestall propagating disturbances in axial compressors and their potential as a stall warning indicator

Eck, Mario ; Geist, Silvio ; Peitsch, Dieter (2017)

Axial compressors in aero engines are prone to suffering a breakdown of orderly flow when operating at the peak of the pressure rise characteristic. The damaging potential of separated flows is why a safe distance has to be left between every possible operating point and an operating point at which stall occurs. During earlier investigations of stall inception mechanisms, a new type of prestall...

Aktive Beeinflussung von Querströmungsinstabilitäten mit pneumatischen Aktuatoren

Lohse, Jakob (2017)

Die Vorliegende Arbeit behandelt die Kontrolle von Querströmungsinstabilitäten mit pneumatischen Aktuatoren. Über stationäres Ausblasen oder Einsaugen durch spannweitig periodisch angeordnete Lochreihen wird ein künstlich angeregtes Wirbelsystem in die dreidimensionale Grenzschicht eingebracht, welches das Wachstum der natürlichen Querströmungswirbel dämpft und somit die Transition stromab vers...

A flexible attitude control system for three-axis stabilized nanosatellites

Gordon, Karsten (2018)

This thesis investigates a new concept for the flexible design and verification of an ADCS for a nanosatellite platform. In order to investigate guidelines for the design of a flexible ADCS, observations of the satellite market and missions are recorded. Following these observations, the author formulates design criteria which serve as a reference for the conceptual design of the flexible ADCS....

Implementing energy status in head-down cockpit displays: impact of augmented energy information on pilot’s performance

Müller, Simon ; Manzey, Dietrich ; Schreiter, Karolin ; Luckner, Robert (2015)

It is safety critical for pilots to be aware of the aircraft’s energy state in terms of proper altitude and airspeed. A loss of energy awareness is an important human factors issue in modern civil aircraft. In order to maintain the energy awareness and support the manual flying skills, several cockpit display concepts suggest to augment the current energy status of the aircraft on primary fligh...

An aeroelastic reduced order model for dynamic response prediction to gust encounters

Quero Martín, David (2017)

The main contribution of this work is the development of a method which bridges the gap between the computational effort required by high-fidelity aeroelastic methods and the loss of accuracy of low-fidelity methods in transonic flow regimes. The aeroelastic Reduced Order Model (ROM) aims to predict not only the aircraft response to gust encounters but also the airframe loads as provided by hig...

A unified analytical approach for the acoustic conceptual design of fans of modern aero-engines

Moreau, Antoine (2017)

This thesis proposes a set of theoretical models to predict, during the conceptual design phase, the sound emitted by the fan stage of an aero-engine, which is due to the interaction of its solid surfaces with the flow. The models are analytical or semi-analytical in nature, and cover a range of disciplines that span between aerodynamics and acoustics. Various fan architectures, such as the con...

Detailed design of a high speed switched reluctance starter/generator for more/all electric aircraft

Shoujun, Song ; Weiguo, Liu ; Peitsch, Dieter ; Schäfer, Uwe (2010)

The basic concepts and advantages of more/all electric aircraft (M/AEA) are briefly addressed. The combined starter/generator (CS/G) system is introduced as a key technology to enable M/AEA. Some important performance requirements for CS/G system are obtained. Based on these requirements, a high speed switched reluctance machine (SRM) is designed to operate as a starter/generator. The entire de...

Advanced Approach Light System

Behrend, Ferdinand (2017)

The constant growth in aviation requires the introduction of new technologies, in order to meet the demand for increasing capacity. Especially the airport often represents the limiting factor. Poor visibility conditions and an insufficiently equipped ground infrastructure, regarding navigation facilities, can lead to restrictions in maintaining the prevailing traffic flow – especially during th...

Active separation control by multiple cooperative actuation

Blechschmidt, Markus (2017)

This thesis aims at reducing the impulse and the required mass flow needed in active separation control by pulsed actuation systems. The investigated strategy to achieve this is based on the cooperative action of multiple rows of actuators positioned downstream of each other. As shown by the analysis of PIV measurements in conjunction with pressure measurements, the fluidic rows can be actuate...