Inst. Luft- und Raumfahrt

88 Items

Recent Submissions
Design and structural optimization of a flying wing of low aspect ratio based on flight loads

Voß, Arne (2020)

The design process for new aircraft configurations is complex, very costly and many disciplines are involved, like aerodynamics, structure, loads analysis, aeroelasticity, flight mechanics and weights. Their task is to substantiate the selected design, based on physically meaningful simulations and analyses. Modifications are much more costly at a later stage of the design process. Thus, the pr...

sUAS Swarm Navigation using Inertial, Range Radios and Partial GNSS

Uijt de Haag, Maarten ; Huschbeck, Svenja ; Huff, Joel (2019-09-10)

Small Unmanned Aerial Systems (sUAS) operations are increasing in demand and complexity. Using multiple cooperative sUAS (i.e. a swarm) can be beneficial and is sometimes necessary to perform certain tasks (e.g., precision agriculture, mapping, surveillance) either independent or collaboratively. However, controlling the flight of multiple sUAS autonomously and in real-time in a challenging env...

Case Study on Aircraft Noise Reduction by Variation of Departure Profiles during Night Flights

Mitzkat, Mathias ; Strümpfel, Christoph (2020-02-12)

Since the civil air transportation sector has been growing significantly, with an increase not only in number of flights, but also with regards to their environmental impact, emissions have been growing to the same degree. Residents in areas around airports are therefore exposed to an increasing strain of noise pollution. Past scientific research has identified large potential through the imple...

nxControl: Ein Beitrag zum reglergestützten manuellen Fliegen

Schreiter, Karolin (2020)

In der vorliegenden Arbeit wird die Entwicklung des Vorgabereglers nxControl für das longitudinale Lastvielfache nx zur effektiven Unterstützung des manuellen Fliegens von Verkehrsflugzeugen beschrieben. Das Lastvielfache nx ist äquivalent zum Gesamtenergiewinkel und damit zur spezifischen zeitlichen Änderung der Gesamtenergie des Flugzeugs. Das Lastvielfache ist direkt proportional zur Differe...

Precise Relative Navigation and Separation Assurance of UAS and Manned Aircraft during Low Altitude Airfield Operations

Schuster, Eric ; Strümpfel, Christoph ; Huschbeck, Svenja ; Göbel, Bastian ; Berth, Christian ; Uijt de Haag, Maarten (2020-01-05)

This paper discusses the flight test setup and preliminary results of a precise relative navigation and separation assurance system to support safe simultaneous operation of general aviation aircraft and UAS at low altitudes in the vicinity of an uncontrolled airfield. With an increased use of UAS for a wide variety of applications, such as law enforcement, search and rescue, agriculture, infra...

Assured Multi-Mode Navigation for Urban Operations of Small UAS

Strümpfel, Christoph ; Schuster, Eric ; Huschbeck, Svenja ; Berth, Christian ; Uijt de Haag, Maarten (2020-01-05)

The paper discusses the preliminary analysis of an urban availability tool required for preflight flight planning. In this tool, areas in an urban environment are assessed with respect to GNSS availability, separation to traffic and obstacles, impact of UAS noise, and various other criteria. GNSS availability will drive the necessity to include alterna-tive navigation sensors such as laser scan...

Design and Implementation of a Narrow-Band Intersatellite Network with Limited Onboard Resources for IoT

Yoon, Zizung ; Frese, Walter ; Briess, Klaus (2019-09-27)

Satellite networks are inevitable for the ubiquitous connectivity of M2M (machine to machine) and IoT (internet of things) devices. Advances in the miniaturization of satellite technology make networks in LEO (Low Earth Orbit) predestined to serve as a backhaul for narrow-band M2M communication. To reduce latency and increase network responsivity, intersatellite link capability among nodes is a...

Aircraft-scale application of active separation control at the pylon-wing junction

Schlösser, Philipp (2019)

The wing area behind the pylon-wing junction of conventional civil aircraft configurations with underwing-mounted turbofan engines is susceptible to local flow separation at high angles of attack, which potentially impacts the maximum lift performance of the aircraft. With further advances in turbofan engine technology, bypass-ratios will reach levels of larger than 15:1. As long as no drastic ...

Untersuchungen zur Anwendung von Entfernungssensoren für Kleinsatelliten

Grimm, Martin (2019)

Today the use of selected electrical, electronic and electromechanical commercial off-the-shelf (COTS) components in space applications is expanding. The main drive for using COTS in space is cost saving, but market non-availability, performance issues and a small form factor are further reasons to go for COTS. Small satellite missions in particular tend to apply COTS already more than others. ...

Design automation and performance analysis of modular reconfigurable attitude control systems

Meschede, Thomas (2019)

The subject of this thesis is the development of attitude control systems for modular satellites. Modular, reconfigurable space systems are being investigated for two reasons: on the one hand, to achieve a faster, more flexible and cost-effective development of space systems in times of massively decreasing launch costs. On the other hand, systems have to be made serviceable in order to avoid b...

Numerical Assessment of Virtual Control Surfaces for Load Alleviation on Compressor Blades

Motta, Valentina ; Malzacher, Leonie ; Peitsch, Dieter (2018-01-17)

Virtual control surfaces for the optimization of steady and unsteady airloads on a compressor cascade are assessed numerically. The effects of mechanical surfaces are realized with plasma actuators, located both on the pressure and on the suction side of the blade trailing edge. Suction side plasma actuation is thought to reproduce the effects of mechanical wing spoilers, whereas pressure side ...

Präzisere Echtzeit-Flugsimulation kleiner Nutzflugzeuge durch Integration feingranularer Teilmodelle

Meyer-Brügel, Wolfram (2019)

Die Technologien und Anwendungsgebiete für UAV und kleine Nutzflugzeuge haben im zivilen Bereich in letzter Zeit eine rasante Entwicklung erfahren. Da der Betrieb dieser Systeme mit erheblichen Sicherheitsrisiken für den Luftverkehr verbunden ist, wird für die Soft- und Hardwareentwicklung der erforderlichen komplexen und sicherheitskritischen Avioniksysteme ein Prozess benötigt, der eine vergl...

An extended modal approach for nonlinear aeroelastic simulations of highly flexible aircraft structures

Ritter, Markus Raimund (2019)

Some classes of aircraft are characterized by highly flexible wings undergoing large structural deformations in steady and maneuvering flight. In most cases this flexibility is the result of a high aspect ratio, which is in turn forced by dedicated design criteria such as the reduction of the induced drag. Prominent examples for such configurations are High Altitude Long Endurance (HALE) aircra...

Investigations on the current and future use of radio frequency allocations for small satellite operations

Buscher, Martin (2019)

Global radio frequency spectrum use for satellite communication is a present-day challenge that has been aggravated by the increased launch of small satellites during the past 15 years. This thesis aims to examine both regulatory and technical aspects of spectrum use. The focus of this examination is on frequency bands that are commonly used by small satellites and on those bands that might be ...

Flight mechanics and flight control for a multibody aircraft

Köthe, Alexander (2019)

Aircraft operating as so-called High Altitude Platform Systems (HAPS) have been considered as a complementary technology to satellites since several years. These aircraft can be used for similar communication and monitoring tasks while operating at a fraction of the cost. Such concepts have been successfully tested. Those include the AeroVironment Helios and the Airbus Zephyr, with an endurance...

Data for A Tutorial on the Proper Orthogonal Decomposition

Weiss, Julien (2019-06-19)

Experimental database from AIAA Paper 2019-3333 (A Tutorial on the Proper Orthogonal Decomposition) presented at the AIAA Aviation Conference 2019 in Dallas, Texas, on June 19th, 2019. The database consits of 2D velocity fields measured by PIV that are used to generate the figures in the paper.

A Tutorial on the Proper Orthogonal Decomposition

Weiss, Julien (2019)

This tutorial introduces the Proper Orthogonal Decomposition (POD) to engineering students and researchers interested in its use in fluid dynamics and aerodynamics. The objectives are firstly to give an intuitive feel for the method and secondly to provide example MATLAB codes of common POD algorithms. The discussion is limited to the finite-dimensional case and only requires knowledge of basic...

Untersuchung von PIO-Tendenzen bei plötzlichen Umschaltungen in der Flugdynamik

Schönfeld, Andrej (2019)

Bisher wurden Kopplungsphänomene des Gesamtsystems Pilot-Flugzeug (Piloteninduzierte Schwingungen, PIO) nach einer Umschaltung im Flugregelungssystem nur unzureichend systematisch untersucht. In den letzten Jahren traten jedoch einige Vorfälle in der zivilen Luftfahrt auf, die zeigten, dass schwere Vorfälle entstehen können, wenn Umschaltungen der Flugregelungsgesetze involviert sind. Die vorli...

Methodik zur Bewertung von Flugverfahren hinsichtlich Fluglärm und weiteren Kriterien

Müller, Marvin ; Strümpfel, Christoph (2019-01)

Geänderte Betriebsverfahren an Flughäfen können für Bewohner von flughafennahen Gebieten verminderten Fluglärm und verbesserte Luftqualität bedeuten, während in anderen Gebieten im Umkreis von Flughäfen gegensätzliche Effekte zu beobachten sind. Folglich ist an Flughäfen, insbesondere jenen in Industrieländern, ein massiver Interessenkonflikt während des Flugbetriebs und in Hinblick auf Änderun...

Control of secondary flow structures on a highly loaded compressor cascade

Zander, Vincent ; Nitsche, W. (2013)

This paper presents detailed flow-field measurements for a compressor cascade equipped with synthetic jet actuators for active flow control. The synthetic jets are mounted on the cascade sidewall and the suction side surface of the blade to reduce the total pressure loss caused by strong secondary flow structures developing in the passage. There are certain articles reporting that synthetic jet...