TY  - CHAP
A1  - Mertens, Josef
ED  - Sobieczky, H.
T1  - Supersonic laminar flow
T2  - New design concepts for high speed air transport. - (Courses and lectures / International Centre for Mechanical Sciences ; 366)
N2  - Supersonic transports are very drag sensitive. Technology to reduce drag by application of laminar flow, therefore, will be important; it is a prerequisite to achieve very long range capability. In earlier studies it was assumed that SCTs would only become possible by application of laminar flow [376]. But today, we request an SCT to be viable without application of laminar flow in order to maintain its competitiveness when laminar flow becomes available for subsonic and supersonic transports. By reducing fuel burned, laminar flow drag reduction reduces size and weight of the aircraft, or increases range capability -whereas otherwise size and weight would grow towards infinity. Transition mechanisms from laminar to turbulent state of the boundary layer flow (ALT, CFI, TSI) function as for transonic transports, but at more severe conditions: higher sweep angles, cooled surfaces; higher mode instabilities (HMI) must at least be taken into account, although they may not become important below Mach 3. Hitherto there is a worldwide lack of ground test facilities to investigate TSI at the expected cruise Mach numbers between 1.6 and 2.4; in Stuttgart, Germany one such facility -a Ludwieg tube- is still in the validation phase. A quiet Ludwieg tunnel could be a favourable choice for Europe. But it will require a new approach in designing aircraft which includes improved theoretical predictions, usage of classical wind tunnels for turbulent flow and flight tests for validation.
KW  - Wind Tunnel
KW  - Flight Test
KW  - Supersonic Wind Tunnel
KW  - Parabolized Stability Equation
Y1  - 1997
SN  - 3-2118-2815-X
U6  - http://dx.doi.org/10.1007/978-3-7091-2658-5_18
SP  - 275
EP  - 290
PB  - Springer
CY  - Wien [u.a.]
ER  - 
TY  - CHAP
A1  - Mertens, Josef
ED  - Sobieczky, H.
T1  - Son of Concorde, a technology challenge
T2  - New design concepts for high speed air transport. - (Courses and lectures / International Centre for Mechanical Sciences ; 366)
N2  - Concorde (Figure 9) is the only supersonic airliner which has been introduced into regular passenger service. It is still in service at British Airways and Air France without any flight accidents, and probably will stay in service for at least for ten more years.
KW  - Technology Challenge
KW  - Multidisciplinary Design Optimization
KW  - Specific Fuel Consumption
KW  - Engine Efficiency
KW  - Sonic Boom
Y1  - 1997
SN  - 3-2118-2815-X
U6  - http://dx.doi.org/10.1007/978-3-7091-2658-5_3
SP  - 31
EP  - 51
PB  - Springer
CY  - Wien [u.a.]
ER  - 
TY  - JOUR
A1  - Mertens, Josef
T1  - Charakteristiken des Staub-Gas-Gemisches
JF  - Zeitschrift für angewandte Mathematik und Mechanik : ZAMM. 65 (1985), H. 4
Y1  - 1985
SN  - 1521-4001
SP  - T211
EP  - T213
ER  - 
TY  - BOOK
A1  - Mertens, Josef
T1  - Instationäre Strömungen von Gasen mit brennbaren Partikeln
Y1  - 1983
N1  - Aachen, Techn. Hochschule, Diss., 1983
CY  - Aachen
ER  - 
TY  - CHAP
A1  - Mertens, Josef
T1  - Next steps envisaged to improve wing performance of commercial aircraft
T2  - Aerodynamic drag reduction technologies : proceedings of the CEAS/DragNet European Drag Reduction Conference, 19–21 June 2000, Potsdam, Germany. - (Notes on numerical fluid mechanics ; 76)
Y1  - 2001
SN  - 3-540-41911-X (Print)
SN  - 978-3-540-45359-8 (Elektronisch)
U6  - http://dx.doi.org/10.1007/978-3-540-45359-8_26
SP  - 246
EP  - 255
PB  - Springer
CY  - Berlin [u.a.]
ER  - 
TY  - CHAP
A1  - Mertens, Josef
T1  - Reduction of aerodynamic drag (RaWid)-Status after the first year of the program
T2  - New results in numerical and experimental fluid mechanics. - (Notes on numerical fluid mechanics ; 60)
N2  - The technology programme “Reduction of aerodynamic drag (RaWid)” for high speed aerodynamics at Daimler-Benz Aerospace Airbus is sponsered by the German ministry for education, research and technology since July 1, 1995. Connected to this industrial programme are the cooperation programmes “MEGAFLOW” under leadership of the DLR and “Transition” by the DFG, and several contributions by DLR and universities.

The programme is oriented towards technologies required for a MEGALINER which gains momentum by the ambitious plans for a new large Airbus A3XX.

In the first year new technological steps were undertaken in theory, design and experiment. Some critical steps were verified by wing designs checked in wind tunnel tests.
KW  - Wind Tunnel
KW  - Aerodynamic Drag
KW  - Flight Test
KW  - Friction Drag
Y1  - 1997
SN  - 3-528-06960-0
U6  - http://dx.doi.org/10.1007/978-3-322-86573-1_2
SP  - 7
EP  - 14
PB  - Vieweg
CY  - Braunschweig [u.a.]
ER  - 
TY  - JOUR
A1  - Mertens, Josef
T1  - Luft hat keine Balken, aber enorme Kräfte : Aerodynamik - die unsichtbare Kraft
JF  - HEmagazin : das Hocheffizienz-Magazin von Wilo. 2006 (2006), H. 1
Y1  - 2006
SP  - 4
EP  - 9
PB  - -
ER  - 
TY  - JOUR
A1  - Mertens, Josef
T1  - Required technologies for supersonic aircraft
JF  - Fluid dynamics research on supersonic aircraft : this report is a compilation of the edited proceedings of the special course on "Fluid dynamic research on supersonic aircraft" held at the Karman Institute for Fluid Dynamics (VKI) in Rhode-Saint-Genese, Belgium, 25-29 May 1998
Y1  - 1998
SN  - 92-837-1007-X
N1  - (RTO educational notes ; 4)
SP  - 5.1
EP  - 5.16
PB  - Research and Technology Organization
CY  - Neuilly-sur-Seine
ER  - 
TY  - JOUR
A1  - Mertens, Josef
T1  - Multi point design challenges for supersonic transports
JF  - Fluid dynamics research on supersonic aircraft : this report is a compilation of the edited proceedings of the special course on "Fluid dynamics research on supersonic aircraft" held at the Karman Institute for Fluid Dynamics (VKI) in Rhode-Saint-Genese, Belgium, 25-29 May 1998
Y1  - 1998
SN  - 92-837-1007-X
SP  - 8.1
EP  - 8.12
PB  - Research and Technology Organization
CY  - Neuilly-sur-Seine
ER  - 
TY  - JOUR
A1  - Mertens, Josef
T1  - Laminar flow for supersonic transports
JF  - Proceedings : March 16 - 18, 1992, Congress Centrum, Hamburg, Federal Republic of Germany / organized jointly by: Deutsche Gesellschaft für Luft- und Raumfahrt e.V. ... [Programme committee J. Szodruch ...]
Y1  - 1992
SN  - 3-922010-73-3
N1  - DGLR-Bericht ; 92,06
SP  - 319
EP  - 323
PB  - DGLR
CY  - Bonn
ER  - 
TY  - JOUR
A1  - Mertens, Josef
T1  - Aerodynamische Ziele des Adaptiven Flügels (ADIF).
JF  - DGLR-Jahrbuch 1998 Bd. 1
Y1  - 1998
N1  - DGLR-JT98-213
SP  - 47
EP  - 52
ER  - 
TY  - JOUR
A1  - Mertens, Josef
T1  - Einige herausragende Ergebnisse des Technologieprogramms "Reduktion des Aerodynamischen Widerstands (RaWid)"
JF  - DGLR-Jahrbuch 1999 Bd. 3
Y1  - 1999
N1  - DGLR-JT99-047
SP  - 1461
EP  - 1468
ER  - 
TY  - BOOK
A1  - Mertens, Josef
T1  - Reduktion des aerodynamischen Widerstands (RaWid) : Abschlußbericht ; Laufzeit des Vorhaben, Berichtszeitraum: 01.07.1995 bis 31.12.1998 / Verf.: J. Mertens
Y1  - 1999
N1  - Förderkenzeichen BMBF 20 A 9595 A. Engl. Zsfassung u.d.T.: Reduction of aerodynamis drag (RaWid) - final report . auch als elektronisches Dokument vorh.
PB  - DaimlerChrysler Aerospare Airbus GmbH
CY  - Hamburg
ER  - 
TY  - BOOK
A1  - Mertens, Josef
T1  - Reduktion des aerodynamischen Widerstands (RaWid) : Abschlußbericht ; Laufzeit des Vorhaben, Berichtszeitraum: 01.07.1995 bis 31.12.1998 / Verf.: J. Mertens
Y1  - 1999
N1  - Parallel als gedruckte Ausgabe erschienen
PB  - DaimlerChrysler Aerospare Airbus GmbH
CY  - Hamburg
ER  - 
TY  - CHAP
A1  - Mertens, Josef
ED  - Nitsche, Wolfgang
T1  - Some important results of the technology programme RaWid
T2  - New Results in Numerical and Experimental Fluid Mechanics : Contributions to the 11th AG STAB/DGLR Symposium Berlin, Germany 1998. - Vol. 2. - (Notes on Numerical Fluid Mechanics ; 72)
Y1  - 1999
SN  - 978-3-663-10903-7 (Print)
SN  - 978-3-663-10901-3 (Elektronisch)
U6  - http://dx.doi.org/10.1007/978-3-663-10901-3_41
SP  - 315
EP  - 322
PB  - Springer Fachmedien
CY  - Wiesbaden
ER  - 
TY  - CHAP
A1  - Mertens, Josef
A1  - Becker, K.
ED  - Ballmann, Josef
T1  - Numerical solution of flow equations : an aircraft designer's view
T2  - Nonlinear hyperbolic equations - theory, computation methods, and applications : proceedings of the 2nd International Conference on Nonlinear Hyperbolic Problems, Aachen, FRG, March 14 to 18, 1988. - (Notes on Numerical Fluid Mechanics ; 24)
N2  - Today the most accurate and cost effective industrial codes used in aircraft design are based on the full potential equation coupled with boundary layer equations. However, these are not capable to solve complicated three-dimensional problems of vortical flows and shocks. On the other hand Euler and Navier-Stokes codes are too expensive and not accurate enough for design purposes, especially in regard of drag and interference prediction. The reasons for these deficiencies are investigated and a way to overcome them by future developments is demonstrated.
Y1  - 1989
SN  - 3-528-08098-1
U6  - http://dx.doi.org/10.1007/978-3-322-87869-4_41
N1  - International Conference on Nonlinear Hyperbolic Problems <3, 1988, Aachen>
SP  - 403
EP  - 412
PB  - Vieweg
CY  - Braunschweig
ER  - 
TY  - JOUR
A1  - Mertens, Josef
A1  - Henke, Rolf
T1  - Adaptive technologies for future civil air transport
JF  - Air & Space Europe. 3 (2001), H. 3-4
Y1  - 2001
SN  - 1247-5793
SP  - 80
EP  - 82
ER  - 
TY  - JOUR
A1  - Mertens, Josef
A1  - Hünecke, Klaus
T1  - Experimentelle Untersuchung zur Landeeigenschaft von Hyperschall-Fluggeräten / Hünecke, Klaus ; Mertens, Josef
JF  - DGLR-Jahrbuch 1988 Bd. 1
Y1  - 1988
N1  - DGLR-88-123
SP  - 706
ER  - 
TY  - JOUR
A1  - Mertens, Josef
A1  - Kelm, R.
A1  - Velden, A. van der
T1  - Interdisziplinäre Auslegung eines Verkehrsflugzeugflügels
JF  - DGLR-Jahrbuch 1999 Bd. 3
Y1  - 1999
N1  - DGLR-JT99-156
SP  - 1605
EP  - 1610
ER  - 
TY  - JOUR
A1  - Mertens, Josef
A1  - Klevenhusen, K. D.
A1  - Jakob, H.
T1  - Accurate Transonic Wave Drag Prediction Using Simple Physical Models
JF  - AIAA-Journal. 25 (1987), H. 6
Y1  - 1987
SN  - 0001-1452
SP  - 799
EP  - 805
ER  - 
TY  - PAT
A1  - Mertens, Josef
A1  - Lajain, Henri
T1  - Method of fabricating leading edge nose structures of aerodynamic surfaces : patent no.: US 6,415,510 B2 ; date of patent: Jul. 9, 2002
Y1  - 2002
N1  - Volltext auch in der Datenbank http://publikationen.dpma.de/ zu finden unter der Nummer US000006415510B2
PB  - United States Patent and Trademark Office
CY  - [Washington, DC]
ER  - 
TY  - JOUR
A1  - Mertens, Josef
A1  - Röger, Wolf
T1  - F-Schlepp: Problem Taumelschwingung
JF  - Aerokurier. 44 (2000), H. 10
Y1  - 2000
SN  - 0341-1281
N1  - in der Bereichsbibliothek unter der Signatur 23 Z 391-2000
SP  - 73
EP  - 73
ER  - 
TY  - PAT
A1  - Mertens, Josef
A1  - Velden, Alexander van der
A1  - Kelm, Roland
T1  - Flugzeug mit Flügeln, deren maximaler Auftrieb durch steuerbare Flügelkomponenten veränderbar ist : Offenlegungsschrift DE102004045732 ; Offenlegungstag: 30.03.2006 = Aircraft with wings whose maximum lift can be altered by controllable wing components
Y1  - 2006
N1  - Zugleich EP1791755A1. - Volltext über Datenbank: http://publikationen.dpma.de/
PB  - Deutsches Patent- und Markenamt
CY  - München
ER  - 
TY  - BOOK
A1  - Mertens, Josef
A1  - Velden, Alexander van der
A1  - Kelm, Roland
A1  - Kokan, David
T1  - Application of MDO to large subsonic transport aircraft
Y1  - 2000
N1  - Aerospace Sciences Meeting and Exhibit <38, 2000, Reno, NV> ; (AIAA Paper ; 00-0844)
PB  - American Institute of Aeronautics and Astronautics
CY  - Reston, Va.
ER  - 
TY  - JOUR
A1  - Meyer, Max-Arno
A1  - Granrath, Christian
A1  - Feyerl, Günter
A1  - Richenhagen, Johannes
A1  - Kaths, Jakob
A1  - Andert, Jakob
T1  - Closed-loop platoon simulation with cooperative intelligent transportation systems based on vehicle-to-X communication
JF  - Simulation Modelling Practice and Theory
Y1  - 2021
U6  - http://dx.doi.org/10.1016/j.simpat.2020.102173
SN  - 1569-190X
VL  - 106
IS  - Art. 102173
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Möhren, Felix
A1  - Bergmann, Ole
A1  - Janser, Frank
A1  - Braun, Carsten
T1  - On the determination of harmonic propeller loads
T2  - AIAA SCITECH 2023 Forum
N2  - Dynamic loads significantly impact the structural design of propeller blades due to fatigue and static strength. Since propellers are elastic structures, deformations and aerodynamic loads are coupled. In the past, propeller manufacturers established procedures to determine unsteady aerodynamic loads and the structural response with analytical steady-state calculations. According to the approach, aeroelastic coupling primarily consists of torsional deformations. They neglect bending deformations, deformation velocities, and inertia terms. This paper validates the assumptions above for a General Aviation propeller and a lift propeller for urban air mobility or large cargo drones. Fully coupled reduced-order simulations determine the dynamic loads in the time domain. A quasi-steady blade element momentum approach transfers loads to one-dimensional finite beam elements. The simulation results are in relatively good agreement with the analytical method for the General Aviation propeller but show increasing errors for the slender lift propeller. The analytical approach is modified to consider the induced velocities. Still, inertia and velocity proportional terms play a significant role for the lift propeller due to increased elasticity. The assumption that only torsional deformations significantly impact the dynamic loads of propellers is not valid. Adequate determination of dynamic loads of such designs requires coupled aeroelastic simulations or advanced analytical procedures.
Y1  - 2023
U6  - http://dx.doi.org/10.2514/6.2023-2404
N1  - AIAA SCITECH 2023 Forum, 23-27 January 2023, National Harbor, MD & Online
PB  - AIAA
ER  - 
TY  - JOUR
A1  - Neu, Eugen
A1  - Janser, Frank
A1  - Khatibi, Akbar A.
A1  - Braun, Carsten
A1  - Orifici, Adrian C.
T1  - Operational Modal Analysis of a wing excited by transonic flow
JF  - Aerospace Science and Technology
N2  - Operational Modal Analysis (OMA) is a promising candidate for flutter testing and Structural Health Monitoring (SHM) of aircraft wings that are passively excited by wind loads. However, no studies have been published where OMA is tested in transonic flows, which is the dominant condition for large civil aircraft and is characterized by complex and unique aerodynamic phenomena. We use data from the HIRENASD large-scale wind tunnel experiment to automatically extract modal parameters from an ambiently excited wing operated in the transonic regime using two OMA methods: Stochastic Subspace Identification (SSI) and Frequency Domain Decomposition (FDD). The system response is evaluated based on accelerometer measurements. The excitation is investigated from surface pressure measurements. The forcing function is shown to be non-white, non-stationary and contaminated by narrow-banded transonic disturbances. All these properties violate fundamental OMA assumptions about the forcing function. Despite this, all physical modes in the investigated frequency range were successfully identified, and in addition transonic pressure waves were identified as physical modes as well. The SSI method showed superior identification capabilities for the investigated case. The investigation shows that complex transonic flows can interfere with OMA. This can make existing approaches for modal tracking unsuitable for their application to aircraft wings operated in the transonic flight regime. Approaches to separate the true physical modes from the transonic disturbances are discussed.
Y1  - 2016
U6  - http://dx.doi.org/10.1016/j.ast.2015.11.032
SN  - 1270-9638
VL  - 49
SP  - 73
EP  - 79
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Neu, Eugen
A1  - Janser, Frank
A1  - Khatibi, Akbar A.
A1  - Orifici, Adrian C.
T1  - Operational modal analysis of a cantilever in a wind tunnel using optical fiber bragg grating sensors
T2  - 6th International Operational Modal Analysis Conference. IOMAC´15. 2015 May 12-14 Gijon - Spain
Y1  - 2015
U6  - http://dx.doi.org/10.13140/RG.2.1.3753.0324
ER  - 
TY  - JOUR
A1  - Neu, Eugen
A1  - Janser, Frank
A1  - Khatibi, Akbar A.
A1  - Orifici, Adrian C.
T1  - Fully Automated Operational Modal Analysis using multi-stage clustering
JF  - Mechanical Systems and Signal Processing
Y1  - 2017
U6  - http://dx.doi.org/10.1016/j.ymssp.2016.07.031
SN  - 0888-3270
VL  - Vol. 84, Part A
SP  - 308
EP  - 323
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Neu, Eugen
A1  - Janser, Frank
A1  - Khatibi, Akbar A.
A1  - Orifici, Adrian C.
T1  - Automated modal parameter-based anomaly detection under varying wind excitation
JF  - Structural Health Monitoring
N2  - Wind-induced operational variability is one of the major challenges for structural health monitoring of slender engineering structures like aircraft wings or wind turbine blades. Damage sensitive features often show an even bigger sensitivity to operational variability. In this study a composite cantilever was subjected to multiple mass configurations, velocities and angles of attack in a controlled wind tunnel environment. A small-scale impact damage was introduced to the specimen and the structural response measurements were repeated. The proposed damage detection methodology is based on automated operational modal analysis. A novel baseline preparation procedure is described that reduces the amount of user interaction to the provision of a single consistency threshold. The procedure starts with an indeterminate number of operational modal analysis identifications from a large number of datasets and returns a complete baseline matrix of natural frequencies and damping ratios that is suitable for subsequent anomaly detection. Mahalanobis distance-based anomaly detection is then applied to successfully detect the damage under varying severities of operational variability and with various degrees of knowledge about the present operational conditions. The damage detection capabilities of the proposed methodology were found to be excellent under varying velocities and angles of attack. Damage detection was less successful under joint mass and wind variability but could be significantly improved through the provision of the currently encountered operational conditions.
Y1  - 2016
U6  - http://dx.doi.org/10.1177/1475921716665803
SN  - 1475-9217
VL  - 15
IS  - 6
SP  - 1
EP  - 20
PB  - Sage
CY  - London
ER  - 
TY  - CHAP
A1  - Neu, Eugen
A1  - Janser, Frank
A1  - Khatibi, Akbar A.
A1  - Orifici, Adrian C.
T1  - In-flight vibration-based structural health monitoring of aircraft wings
T2  - 30th Congress of the internatonal council of the aeronautical sciences : 25.-30. September 2016, Daejeon, Korea
N2  - This work presents a methodology for automated
damage-sensitive feature extraction and anomaly
detection under multivariate operational variability
for in-flight assessment of wings. The
method uses a passive excitation approach, i. e.
without the need for artificial actuation. The
modal system properties (natural frequencies and
damping ratios) are used as damage-sensitive
features. Special emphasis is placed on the use
of Fiber Bragg Grating (FBG) sensing technology
and the consideration of Operational and
Environmental Variability (OEV). Measurements
from a wind tunnel investigation with a composite
cantilever equipped with FBG and piezoelectric
sensors are used to successfully detect an impact
damage. In addition, the feasibility of damage
localisation and severity estimation is evaluated
based on the coupling found between damageand
OEV-induced feature changes.
Y1  - 2016
ER  - 
TY  - CHAP
A1  - Niedermeier, H.
A1  - Clemens, J.
A1  - Kowalski, Julia
A1  - Macht, S.
A1  - Heinen, D.
A1  - Hoffmann, R.
A1  - Linder, Peter
T1  - Navigation system for a research ice probe for antarctic glaciers
T2  - IEEE/ION Position, Location and Navigation Symposium (PLANS) ; 5-8 May 2014, Monterey, Calif.
Y1  - 2014
SN  - 978-1-4799-3319-8
SP  - 959
EP  - 975
PB  - IEEE
CY  - Piscataway, NJ
ER  - 
TY  - PAT
A1  - Nonhoff, Gottfried
A1  - Wahle, Michael
T1  - Anordnung zur Dämpfung von Schwingungen an Bauwerken und Bauteilen : Offenlegungsschrift / Europäische Patentschrift
T1  - Arrangement for damping vibrations of structures or parts thereof : patent of invention
Y1  - 1990
PB  - Deutsches Patent- und Markenamt / Europäisches Patentamt
CY  - München / Den Hague
ER  - 
TY  - CHAP
A1  - Nowack, N.
A1  - Röth, Thilo
A1  - Bührig-Polaczek, A.
A1  - Klaus, G.
ED  - Hirsch, Jürgen
T1  - Advanced Sheet Metal Components Reinforced by Light Metal Cast Structures
T2  - Aluminium alloys : their physical and mechanical properties ; [proceedings of the 11th International Conference on Aluminium Alloys, 22 - 26 Sept. 2008, Aachen, Germany ; ICAA 11]
Y1  - 2008
SN  - 978-3-527-32367-8
IS  - 2
SP  - 2374
EP  - 2381
ER  - 
TY  - CHAP
A1  - Ohndorf, Andreas
A1  - Dachwald, Bernd
A1  - Seboldt, Wolfgang
A1  - Schartner, Karl-Heinz
T1  - Flight times to the heliopause using a combination of solar and radioisotope electric propulsion
T2  - 32nd International Electric Propulsion Conference
N2  - We investigate the interplanetary flight of a low-thrust space probe to the heliopause,located at a distance of about 200 AU from the Sun. Our goal was to reach this distance within the 25 years postulated by ESA for such a mission (which is less ambitious than the 15-year goal set by NASA). Contrary to solar sail concepts and combinations of allistic and electrically propelled flight legs, we have investigated whether the set flight time limit could also be kept with a combination of solar-electric propulsion and a second, RTG-powered upper stage. The used ion engine type was the RIT-22 for the first stage and the RIT-10 for the second stage. Trajectory optimization was carried out with the low-thrust optimization program InTrance, which implements the method of Evolutionary Neurocontrol,using Artificial Neural Networks for spacecraft steering and Evolutionary Algorithms to optimize the Neural Networks’ parameter set. Based on a parameter space study, in which the number of thrust units, the unit’s specific impulse, and the relative size of the solar power generator were varied, we have chosen one configuration as reference. The transfer time of this reference configuration was 29.6 years and the fastest one, which is technically
more challenging, still required 28.3 years. As all flight times of this parameter study were longer than 25 years, we further shortened the transfer time by applying a launcher-provided hyperbolic excess energy up to 49 km2/s2. The resulting minimal flight time for the reference configuration was then 27.8 years. The following, more precise optimization to a launch with the European Ariane 5 ECA rocket reduced the transfer time to 27.5 years. This is the fastest mission design of our study that is flexible enough to allow a launch every
year. The inclusion of a fly-by at Jupiter finally resulted in a flight time of 23.8 years,which is below the set transfer-time limit. However, compared to the 27.5-year transfer,this mission design has a significantly reduced launch window and mission flexibility if the
escape direction is restricted to the heliosphere’s “nose".
KW  - low-thrust trajectory optimization
KW  - heliosphere
KW  - ion propulsion
Y1  - 2011
N1  - IEPC-2011-051
32nd International Electric Propulsion Conference,September 11–15, 2011
Wiesbaden, Germany
SP  - 1
EP  - 12
ER  - 
TY  - JOUR
A1  - Olaru, Alexandra Maria
A1  - Kowalski, Julia
A1  - Sethi, Vaishali
A1  - Blümich, Bernhard
T1  - Exchange relaxometry of flow at small Péclet numbers in a glass bead pack
JF  - Journal of Magnetic Resonance (JMR)
N2  - In this paper we consider low Péclet number flow in bead packs. A series of relaxation exchange experiments has been conducted and evaluated by ILT analysis. In the resulting correlation maps, we observed a collapse of the signal and a translation towards smaller relaxation times with increasing flow rates, as well as a signal tilt with respect to the diagonal. In the discussion of the phenomena we present a mathematical theory for relaxation exchange experiments that considers both diffusive and advective transport. We perform simulations based on this theory and discuss them with respect to the conducted experiments.
KW  - NMR exchange relaxometry
KW  - Low-field NMR
Y1  - 2012
U6  - http://dx.doi.org/10.1016/j.jmr.2012.04.015
SN  - 1096-0856
VL  - 220
SP  - 32
EP  - 44
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Olaru, Alexandra Maria
A1  - Kowalski, Julia
A1  - Sethi, Vaishali
A1  - Blümich, Bernhard
T1  - Fluid Transport in Porous Media probed by Relaxation-Exchange NMR
T2  - 2011 Fall Meeting, AGU, San Francisco, Calif., 5-9 Dec.
Y1  - 2011
N1  - H12B-07; American Geophysical Union
ER  - 
TY  - CHAP
A1  - Otten, D.
A1  - Schmid, M.
A1  - Weber, Tobias
T1  - Advances In Sheet Metal-Forming: Reduction Of Tooling Cost By Methodical Optimization
T2  - Proceedings of SAMPE Europe Conference, Amiens , France
Y1  - 2015
ER  - 
TY  - CHAP
A1  - Otten, D.
A1  - Schmidt, M.
A1  - Weber, Tobias
T1  - Advances in Determination of Material Parameters for Functional Simulations Based on Process Simulations
T2  - SAMPE Europe Conference 16 Liege
Y1  - 2016
SN  - 978-1-5108-3800-0
SP  - 570
EP  - 577
ER  - 
TY  - JOUR
A1  - Otten, Dennis
A1  - Weber, Tobias
A1  - Arent, Jan-Christoph
T1  - Manufacturing Process Simulation – On Its Way to Industrial Application
JF  - International Journal of Aviation, Aeronautics, and Aerospace
N2  - Manufacturing process simulation (MPS) has become more and more important for aviation and the automobile industry. A highly competitive market requires the use of high performance metals and composite materials in combination with reduced manufacturing cost and time as well as a minimization of the time to market for a new product. However, the use of such materials is expensive and requires sophisticated manufacturing processes. An experience based process and tooling design followed by a lengthy trial-and-error optimization is just not contemporary anymore. Instead, a tooling design process aided by simulation is used more often. This paper provides an overview of the capabilities of MPS in the fields of sheet metal forming and prepreg autoclave manufacturing of composite parts summarizing the resulting benefits for tooling design and manufacturing engineering. The simulation technology is explained briefly in order to show several simplification and optimization techniques for developing industrialized simulation approaches. Small case studies provide examples of an efficient application on an industrial scale.
Y1  - 2018
U6  - http://dx.doi.org/10.15394/ijaaa.2018.1217
SN  - 2374-6793
VL  - 5
IS  - 2
PB  - Embry-Riddle Aeronautical University
CY  - Daytona Beach, Fla.
ER  - 
TY  - JOUR
A1  - Overduin, James
A1  - Blome, Hans-Joachim
A1  - Hoell, Josef
T1  - Wolfgang Priester: from the big bounce to the Lambda-dominated universe
JF  - Naturwissenschaften
Y1  - 2007
SN  - 0028-1042
VL  - 94
IS  - 6
SP  - 417
EP  - 429
ER  - 
TY  - CHAP
A1  - Pasligh, N.
A1  - Funke, D.
A1  - Röth, Thilo
A1  - Krack, R.
T1  - Leichtbau Quertrager als Stahlblech-Aluminiumdruckguss-Hybrid - Von der numerischen Berechnung bis zum realen Prototypen
T2  - VDI BERICHTE
Y1  - 2010
SN  - 978-3-18-092107-5
N1  - 15. Kongress SIMVEC Berechnung und Simulation im Fahrzeugbau, 
Baden-Baden, 16. und 17. November 2010
PB  - VDI Verlag
CY  - Düsseldorf
ER  - 
TY  - JOUR
A1  - Peeken, Heinz
A1  - Rosenkranz, Josef
A1  - Schelenz, R.
T1  - Berücksichtigung des Einflusses der Gleitlagergehäusesteifigkeit auf das dynamische Verhalten von Rotoren
JF  - Antriebstechnik : Organ der Forschungsvereinigung Antriebstechnik e.V.
Y1  - 1991
SN  - 0341-2652
VL  - 30
IS  - 9
SP  - 71
EP  - 75
ER  - 
TY  - CHAP
A1  - Peeken, Heinz
A1  - Troeder, Christoph
A1  - Schmidt, J.
A1  - Rosenkranz, Josef
T1  - Principles of machine noise reduction
T2  - Inter-noise 85 : proceedings ; 1985 international conference on noise control engineering ; Munich, Sept. 18 - 20, 1985. - (Schriftenreihe der Bundesanstalt für Arbeitsschutz : Tagungsbericht ; 39)
Y1  - 1985
SN  - 3-88314-417-7
SP  - 23
EP  - 36
PB  - Bundesanstalt für Arbeitsschutz [u.a.]
CY  - Dortmund [u.a.]
ER  - 
TY  - CHAP
A1  - Peloni, A.
A1  - Ceriotti, M.
A1  - Dachwald, Bernd
T1  - Preliminary trajectory design of a multiple NEO rendezvous mission through solar sailing
T2  - Proceedings of the International Astronautical Congress, IAC, Vol. 8, 2014
Y1  - 2015
SN  - 978-1-63439-986-9
SP  - 5352
EP  - 5366
PB  - Curran
CY  - Red Hook, NY
ER  - 
TY  - CHAP
A1  - Peloni, Alessandro
A1  - Ceriotti, Matteo
A1  - Dachwald, Bernd
T1  - Solar-Sailing Trajectory Design for Close-up NEA Observations Mission
T2  - 4th IAA Planetary Defense Conference - PDC 2015, 13-17 April 2015, Frascati, Roma, Italy
Y1  - 2015
N1  - IAA-PDC-15-P-19
ER  - 
TY  - JOUR
A1  - Peloni, Alessandro
A1  - Ceriotti, Matteo
A1  - Dachwald, Bernd
T1  - Solar-sail trajectory design for a multiple near-earth-asteroid rendezvous mission
JF  - Journal of Guidance, Control, and Dynamics
N2  - The scientific interest for near-Earth asteroids as well as the interest in potentially hazardous asteroids from the perspective of planetary defense led the space community to focus on near-Earth asteroid mission studies. A multiple near-Earth asteroid rendezvous mission with close-up observations of several objects can help to improve the characterization of these asteroids. This work explores the design of a solar-sail spacecraft for such a mission, focusing on the search of possible sequences of encounters and the trajectory optimization. This is done in two sequential steps: a sequence search by means of a simplified trajectory model and a set of heuristic rules based on astrodynamics, and a subsequent optimization phase. A shape-based approach for solar sailing has been developed and is used for the first phase. The effectiveness of the proposed approach is demonstrated through a fully optimized multiple near-Earth asteroid rendezvous mission. The results show that it is possible to visit five near-Earth asteroids within 10 years with near-term solar-sail technology.
Y1  - 2016
U6  - http://dx.doi.org/10.2514/1.G000470
SN  - 0731-5090
VL  - 39
IS  - 12
SP  - 2712
EP  - 2724
PB  - AIAA
CY  - Reston, Va.
ER  - 
TY  - JOUR
A1  - Peloni, Alessandro
A1  - Dachwald, Bernd
A1  - Ceriotti, Matteo
T1  - Multiple near-earth asteroid rendezvous mission: Solar-sailing options
JF  - Advances in Space Research
Y1  - 2017
U6  - http://dx.doi.org/10.1016/j.asr.2017.10.017
SN  - 0273-1177
IS  - In Press, Corrected Proof
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Peloni, Alessandro
A1  - Dachwald, Bernd
A1  - Ceriotti, Matteo
T1  - Multiple NEA rendezvous mission: Solar sailing options
T2  - Fourth International Symposium on Solar Sailing
N2  - The scientific interest in near-Earth asteroids (NEAs) and the classification of some of those as potentially hazardous asteroid for the Earth stipulated the interest in NEA exploration. Close-up observations of these objects will increase drastically our knowledge about the overall NEA population. For this reason, a multiple NEA rendezvous mission through solar sailing is investigated, taking advantage of the propellantless nature of this groundbreaking propulsion technology. Considering a spacecraft based on the DLR/ESA Gossamer technology, this work focuses on the search of possible sequences of NEA encounters. The effectiveness of this approach is demonstrated through a number of fully-optimized trajectories. The results show that it is possible to visit five NEAs within 10 years with near-term solar-sail technology. Moreover, a study on a reduced NEA database demonstrates the reliability of the approach used, showing that 58% of the sequences found with an approximated trajectory model can be converted into real solar-sail trajectories. Lastly, this second study shows the effectiveness of the proposed automatic optimization algorithm, which is able to find solutions for a large number of mission scenarios without any input required from the user.
KW  - Multiphase
KW  - Trajectory Optimization
KW  - Automated Optimization
KW  - Gossamer
KW  - Sequence-Search
Y1  - 2017
N1  - Fourth International Symposium on Solar Sailing (ISSS 2017), Kyoto, Japan, 17-20 Jan 2017.
http://www.jsforum.or.jp/ISSS2017/
SP  - 1
EP  - 11
ER  - 
TY  - JOUR
A1  - Peterson, Leif Arne
A1  - Röth, Thilo
A1  - Uibel, Thomas
T1  - Einsatz von Holzwerkstoffen in Fahrzeugstrukturen
JF  - Bauen mit Holz
Y1  - 2017
SN  - 0005-6545
N1  - gedruckt in der Bereichsbibliothek Bayernallee
IS  - 3
SP  - 32
EP  - 38
PB  - Bruderverlag
CY  - Köln
ER  -