TY  - CHAP
A1  - Dachwald, Bernd
T1  - Radiation pressure force model for an ideal laser-enhanced solar sail
T2  - 4th International Symposium on Solar Sailing
N2  - The concept of a laser-enhanced solar sail is introduced and the radiation pressure force model for an ideal laser-enhanced solar sail is derived. A laser-enhanced solar sail is a “traditional” solar sail that is, however, not solely propelled by solar radiation, but additionally by a laser beam that illuminates the sail. The additional laser radiation pressure increases the sail's propulsive force and can give, depending on the location of the laser source, more control authority over the direction of the solar sail’s propulsive force vector. This way, laser-enhanced solar sails may augment already existing solar sail mission concepts and make novel mission concepts feasible.
Y1  - 2017
N1  - 4th International Symposium on Solar Sailing
17-20 January 2017, Kyōto, Japan
SP  - 1
EP  - 5
ER  - 
TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Boden, Ralf
A1  - Ceriotti, Matteo
A1  - Dachwald, Bernd
A1  - Dumont, Etienne
A1  - Grimm, Christian D.
A1  - Lange, Caroline
A1  - Lichtenheldt, Roy
A1  - Pelivan, Ivanka
A1  - Peloni, Alessandro
A1  - Riemann, Johannes
A1  - Spröwitz, Tom
A1  - Tardivel, Simon
T1  - Soil to sail-asteroid landers on near-term sailcraft as an evolution of the GOSSAMER small spacecraft solar sail concept for in-situ characterization
T2  - 5th IAA Planetary Defense Conference
KW  - multiple NEA rendezvous
KW  - solar sail
KW  - GOSSAMER-1
KW  - MASCOT
KW  - asteroid sample return
Y1  - 2017
N1  - 5th IAA Planetary Defense Conference – PDC 2017
15-19 May 2017, Tokyo, Japan
ER  - 
TY  - JOUR
A1  - Golland, Alexander
A1  - Kriegesmann, Torben
ED  - Härting, Niko
T1  - Der Schutz virtueller Identitäten durch die DSGVO
JF  - PinG Privacy in Germany
N2  - Die Frage des Schutzes von virtuellen Identitäten ist – insbesondere bei Online-Medien – von elementarer Bedeutung: Ihre Beantwortung entscheidet über die Anwendbarkeit des Datenschutzrechts auf vermeintlich anonyme Nutzerprofile im Internet. Eine differenzierte Auseinandersetzung mit der Problematik, ob und unter welchen Umständen virtuelle Identitäten dem Datenschutzrecht unterfallen, fehlt bislang. Der vorliegende Beitrag gibt einen Überblick über den Schutz virtueller Identitäten und zeigt Ansätze auf, mittels derer bestimmt werden kann, wann virtuelle Identitäten nach Inkrafttreten der DSGVO durch das Datenschutzrecht geschützt werden.
Y1  - 2017
SN  - 2197-1862
U6  - https://doi.org/10.37307/j.2196-9817.2017.02.03
VL  - 5
IS  - 2
SP  - 45
EP  - 50
PB  - Erich Schmidt Verlag
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Altherr, Lena
A1  - Ederer, Thorsten
A1  - Farnetane, Lucas S.
A1  - Pöttgen, Philipp
A1  - Vergé, Angela
A1  - Pelz, Peter F.
T1  - Multicriterial design of a hydrostatic transmission system via mixed-integer programming
T2  - Operations Research Proceedings 2015
N2  - In times of planned obsolescence the demand for sustainability keeps growing. Ideally, a technical system is highly reliable, without failures and down times due to fast wear of single components. At the same time, maintenance should preferably be limited to pre-defined time intervals. Dispersion of load between multiple components can increase a system’s reliability and thus its availability inbetween maintenance points. However, this also results in higher investment costs and additional efforts due to higher complexity. Given a specific load profile and resulting wear of components, it is often unclear which system structure is the optimal one. Technical Operations Research (TOR) finds an optimal structure balancing availability and effort. We present our approach by designing a hydrostatic transmission system.
Y1  - 2017
SN  - 978-3-319-42901-4
SN  - 978-3-319-42902-1
U6  - https://doi.org/10.1007/978-3-319-42902-1_41
N1  - International Conference of the German, Austrian and Swiss Operations Research Societies (GOR, ÖGOR, SVOR/ASRO), University of Vienna, Austria, September 1-4, 2015
SP  - 301
EP  - 307
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Altherr, Lena
A1  - Dörig, Bastian
A1  - Ederer, Thorsten
A1  - Pelz, Peter Franz
A1  - Pfetsch, Marc
A1  - Wolf, Jan
T1  - A mixed-integer nonlinear program for the design of gearboxes
T2  - Operations Research Proceedings 2016
N2  - Gearboxes are mechanical transmission systems that provide speed and torque conversions from a rotating power source. Being a central element of the drive train, they are relevant for the efficiency and durability of motor vehicles. In this work, we present a new approach for gearbox design: Modeling the design problem as a mixed-integer nonlinear program (MINLP) allows us to create gearbox designs from scratch for arbitrary requirements and—given enough time—to compute provably globally optimal designs for a given objective. We show how different degrees of freedom influence the runtime and present an exemplary solution.
Y1  - 2017
SN  - 978-3-319-55701-4
U6  - https://doi.org/10.1007/978-3-319-55702-1_31
SP  - 227
EP  - 233
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Altherr, Lena
A1  - Ederer, Thorsten
A1  - Schänzle, Christian
A1  - Lorenz, Ulf
A1  - Pelz, Peter F.
T1  - Algorithmic system design using scaling and affinity laws
T2  - Operations Research Proceedings 2015
N2  - Energy-efficient components do not automatically lead to energy-efficient systems. Technical Operations Research (TOR) shifts the focus from the single component to the system as a whole and finds its optimal topology and operating strategy simultaneously. In previous works, we provided a preselected construction kit of suitable components for the algorithm. This approach may give rise to a combinatorial explosion if the preselection cannot be cut down to a reasonable number by human intuition. To reduce the number of discrete decisions, we integrate laws derived from similarity theory into the optimization model. Since the physical characteristics of a production series are similar, it can be described by affinity and scaling laws. Making use of these laws, our construction kit can be modeled more efficiently: Instead of a preselection of components, it now encompasses whole model ranges. This allows us to significantly increase the number of possible set-ups in our model. In this paper, we present how to embed this new formulation into a mixed-integer program and assess the run time via benchmarks. We present our approach on the example of a ventilation system design problem.
KW  - Optimal Topology
KW  - Piecewise Linearization
KW  - Ventilation System
KW  - Similarity Theory
Y1  - 2017
SN  - 978-3-319-42901-4
SN  - 978-3-319-42902-1
U6  - https://doi.org/10.1007/978-3-319-42902-1
N1  - International Conference of the German, Austrian and Swiss Operations Research Societies (GOR, ÖGOR, SVOR/ASRO), University of Vienna, Austria, September 1-4, 2015
SP  - 605
EP  - 611
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Altherr, Lena
A1  - Pelz, Peter F.
A1  - Ederer, Thorsten
A1  - Pfetsch, Marc E.
ED  - Jacobs, Georg
T1  - Optimale Getriebe auf Knopfdruck: Gemischt-ganzzahlige nichtlineare Optimierung zur Entscheidungsunterstützung bei der Auslegung von Getrieben für Kraftfahrzeuge
T2  - Antriebstechnisches Kolloquium ATK 2017
Y1  - 2017
SN  - 9783743148970
N1  - Antriebstechnisches Kolloquium ATK 2017,
07.03-08.03.2017.
Aachen, Deutschland
SP  - 313
EP  - 325
ER  - 
TY  - RPRT
A1  - Digel, Ilya
A1  - Kayser, Peter
T1  - VirEx - Eliminierung von Quarantäne relevanten Viroiden aus Kulturpflanzen Abschlussbericht des Projektes KMU-innovativ-12: Teilprojekt 3
Y1  - 2017
U6  - https://doi.org/10.2314/GBV:1012136345
N1  - Druck-Ausgabe: Schlussbericht für das BMBF-Forschungsvorhaben "VirEx - Eliminierung von Quarantäne relevanten Viroiden aus Kulturpflanzen"
Förderkennzeichen BMBF 031A400C
PB  - Institut für Bioengineering (IfB) der FH Aachen
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Ayed, Anis Haj
A1  - Kusterer, Karsten
A1  - Funke, Harald
A1  - Keinz, Jan
A1  - Bohn, D.
T1  - CFD based exploration of the dry-low-NOx hydrogen micromix combustion technology at increased energy densities
JF  - Propulsion and Power Research
KW  - Micromix combustion
KW  - Hydrogen gas turbine
KW  - Hydrogen combustion
KW  - High hydrogen combustion
KW  - Dry-low-NOx (DLN) combustion
Y1  - 2017
SN  - 2212-540X
U6  - https://doi.org/10.1016/j.jppr.2017.01.005
VL  - 6
IS  - 1
SP  - 15
EP  - 24
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Ayed, Anis Haj
A1  - Striegan, Constantin J. D.
A1  - Kusterer, Karsten
A1  - Funke, Harald
A1  - Kazari, M.
A1  - Horikawa, Atsushi
A1  - Okada, Kunio
T1  - Automated design space exploration of the hydrogen fueled "Micromix" combustor technology
N2  - Combined with the use of renewable energy sources for
its production, Hydrogen represents a possible alternative gas
turbine fuel for future low emission power generation. Due to
its different physical properties compared to other fuels such
as natural gas, well established gas turbine combustion
systems cannot be directly applied for Dry Low NOx (DLN)
Hydrogen combustion. This makes the development of new
combustion technologies an essential and challenging task
for the future of hydrogen fueled gas turbines.
The newly developed and successfully tested “DLN
Micromix” combustion technology offers a great potential to
burn hydrogen in gas turbines at very low NOx emissions.
Aiming to further develop an existing burner design in terms
of increased energy density, a redesign is required in order to
stabilise the flames at higher mass flows and to maintain low
emission levels.
For this purpose, a systematic design exploration has
been carried out with the support of CFD and optimisation
tools to identify the interactions of geometrical and design
parameters on the combustor performance. Aerodynamic
effects as well as flame and emission formation are observed
and understood time- and cost-efficiently. Correlations
between single geometric values, the pressure drop of the
burner and NOx production have been identified as a result.
This numeric methodology helps to reduce the effort of
manufacturing and testing to few designs for single
validation campaigns, in order to confirm the flame stability
and NOx emissions in a wider operating condition field.
Y1  - 2017
N1  - Proceedings of the 1st Global Power and Propulsion Forum
GPPF 2017, Jan 16-18, 2017, Zurich, Switzerland
SP  - 1
EP  - 8
ER  -