Inst. Luft- und Raumfahrt

102 Items

Recent Submissions
Thermalkontrollsystem mit Latentwärmespeicher für Picosatelliten

Wolf, Ronny (2021)

Die Einsatzmöglichkeiten von CubeSats haben in den letzten Jahren, aufgrund des technologischen Fortschritts, rasant zugenommen. Fortschreitende Entwicklungen im Bereich Erdbeobachtung und Echtzeit-Kommunikation, wie dem Internet-der-Dinge, erfordern zunehmend verteilte Satellitensysteme. Damit solche Konstellationen für Unternehmen der NewSpace-Branche finanzierbar sind, werden Anstrengungen u...

Emergency evacuation simulation of commercial aircraft

Gobbin, Andreas ; Khosravi, Raman ; Bardenhagen, Andreas (2021-03-10)

In order to receive certification approval for new products, aircraft manufacturers have to comply with the specifications regarding cabin evacuation. In case of real evacuation trials, agent-based simulation can be deployed, as they are a less cost-intensive mean of analysing passenger behaviour during the evacuation of commercial aircraft. This paper aims at examining the suitability of agent...

Structural design process and subsequent flight mechanical evaluation in preliminary aircraft design: demonstrated on passenger ride comfort assessment

Krishnamurthy, Vikram ; Handojo, Vega (2021-04-19)

New fuel-efficient aircraft designs have high aspect ratio wings. Consequently, those aircraft are more flexible. Additionally, load alleviation functions are implemented to reduce the structural loads, which results in further reductions of the structural stiffness. At the same time, the structural design impacts other disciplines in preliminary aircraft design, especially flight mechanics. Fo...

Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

Löffler, Stephan ; Ebert, Carola ; Weiss, Julien (2021-04-20)

The control of flow separation on aerodynamic surfaces remains a fundamental goal for future air transportation. On airplane wings and control surfaces, the effects of flow separation include decreased lift, increased drag, and enhanced flow unsteadiness and noise, all of which are detrimental to flight performance, fuel consumption, and environmental emissions. Many types of actuators have bee...

Small satellite TT&C allocations below 1 GHz: outcome of ITU WRC-19

von der Ohe, Martin (2020-04-15)

As hundreds of new small satellites are being launched each year, the RF spectrum for satellite communication becomes increasingly occupied. The International Telecommunication Union recognized this problem at World Radiocommunication Conference 2015 (WRC-15) and invited study groups to investigate the utilization of frequency allocations. The studies followed a three-step approach: first, the ...

Tuft deflection velocimetry: a simple method to extract quantitative flow field information

Steinfurth, Ben ; Cura, Carolina ; Gehring, J. ; Weiss, Julien (2020-06-06)

A novel method capable of assessing flow fields in a quick and relatively simple manner is introduced. In an extension to the classical qualitative flow visualization by means of cotton or polymeric tufts, digital data processing is used to extract the orientation of these tufts. This information can be related to physical quantities, in particular to time- and space-dependent velocity signals....

Orbit deployment and drag control strategy for formation flight while minimizing collision probability and drift

Yoon, Zizung ; Lim, Yeerang ; Grau, Sebastian ; Frese, Walter ; Garcia, Manuel A. (2020-03-19)

The compact form factor of nanosatellites or even smaller satellites makes them predestined for distributed systems such as formations, constellations or large swarms. However, when it comes to orbit insertion of multiple satellites, these ride share payloads have constrains in the deployment parameters such as sequence, direction, velocity and time interval. Especially for formation flight mis...

Experimental investigation of an oscillating compressor cascade in the case of aerodynamic mistuning

Malzacher, Leonie (2021)

An experimental investigation has been carried out at an oscillating compressor cascade at the chair for Aero Engines of the Technische Universit at Berlin in Germany. The investigation focuses on the effect of aerodynamic mistuning on aeroelastic stability in a compressor cascade. Aerodynamic mistuning can occur due to manufacturing errors, blade mounting or repair and alters geometrical param...

Structure-system design interdependencies of hybrid-electric aircraft during conceptual design phase

Scheunemann, Annika ; Jacob, Claire ; Bardenhagen, Andreas ; Hoffmann, David ; Würfel, Philipp (2020-02)

The electro-hybridization of aviation might bring the strongly needed decrease of fuel emissions. As the electrification cannot be evaluated with con-ventional methods, the TuRbo electric Aircraft Design Environment (TRADE) was funded by the EU Clean Sky JTI initiative. The consortium aims to develop a multidisciplinary design platform in order to assess the potential of hybridization on the ba...

Efficient and high precision momentum bias attitude control for small satellite

Mukhayadi, Mohammad (2021)

The fast-growing of small satellite technology gives advantages and opportunities for developing country with little or no experience in space technology to enter the field of space technology and its application. The ongoing reduction in mission complexity and the costs associated with management, as well as the possibility of launching it as an auxiliary payload on the launcher, have made the...

Beitrag zur Analyse des Eigenspannungsverhaltens von Composite-Hochdruckspeichern mit metallischem Liner

John, Sebastian (2020)

Bei der Auslegung von Hochdruckspeichern kommen, auf Grund ihrer hohen spezifischen Festigkeit, vermehrt Faserverbundwerkstoffe zum Einsatz. Durch eine hohe Streuung von Material- und Produktionsparametern sowie unterschiedlichster Belastungsszenarien in der Anwendung gestaltet sich jedoch eine Aussage über die Lebensdauer als auch eine Festlegung sinnvoller Prüffristen als schwierig. Die angef...

Contribution to load alleviation in aircraft pre-design and its influence on structural mass and fatigue

Handojo, Vega (2020)

This thesis develops and demonstrates an aircraft pre-design process for loads analysis, load alleviation, structural optimization and fatigue analysis. It is shown that the consideration of maneuver and gust load alleviation in early design stages is a promising concept to reduce wing bending moments, structural mass and extend the fatigue life. The reference aircraft considered are two mid-ra...

Maritime surveillance with small satellites

Hasbi, Wahyudi (2020)

Maritime surveillance is one of the interesting topics nowadays. Monitoring of the ocean and the exclusive economic zone are a prevalent task for many countries. One of the crucial tasks is to make surveillance of the ship traffic and their activities in the ocean. Maritime surveillance usually uses a cooperative and non-cooperative surveillance system. The Automatic Identification System (AIS)...

Propagating disturbances as a prestall instability in axial compressors

Eck, Mario (2020)

The present work deals with the experimental analysis of aerodynamic instabilities in axial compressors. A very effective measure for increasing engine efficiency and reducing noise emissions is to increase the bypass ratio. In modern aircraft engines, this measure is clearly reflected by increasing fan diameters and more compact core engines. This trend inevitably causes the relative gaps betw...

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...