TY  - CHAP
A1  - Bergmann, Kevin
A1  - Gräbener, Josefine
A1  - Wild, Dominik
A1  - Ulfers, H.
A1  - Czupalla, Markus
T1  - Study on thermal stabilization of a GEO-stationary telescope baffling system by integral application of phase change material
T2  - International Conference on Environmental Systems
N2  - The utilization of phase change material (PCM) for latent heat storage and thermal control of spacecraft has been demonstrated in the past in few missions only. One limiting factor was the fact that all concepts developed so far envisioned the PCM to be applied as an additional capacitor, encapsulated in its own housing, leading to mass, efficiency and accommodation challenges. Recently, the application of PCM within the scan cavity of a GEOS type satellite has been suggested, in order to tackle thermal issues due to direct sun intrusion (Choi, M., 2014). However, the application of PCM in such complex mechanical structures is extremely challenging. A new concept to tackle this issue is currently under development at the FH Aachen University of Applied Sciences. The concept "Infused Thermal Solutions (ITS)" is based on the idea to 3D print metallic structures in their regular functional shape, but double walled with internal lattice support structures, allowing the infusion of a PCM layer directly into the voids and eliminating the need for additional parts and interfaces. Together with OHB System, FH Aachen theoretically studied the application of this technology to the Meteosat Third Generation (MTG) Infra-Red Sounder (IRS) instrument. The study focuses on the scan cavity and entrance baffling assembly (EBA) of the IRS. It consists of thermal analyses, 3D-redesign and bread boarding of a scaled and PCM infused EBA version. In the thermal design of the alternative EBA, PCM was applied directly into the EBA, simulating the worst hot case sun intrusion of the mission. By applying 4kg of PCM (to a 60kg baffle) the EBA temperature excursions during sun intrusion were limited from 140K to 30K, leading to a significant thermo-opto-elastic performance gain. This paper introduces the ITS concept development status.
Y1  - 2019
N1  - 49th International Conference on Environmental Systems, 7-11 July 2019, Boston, Massachusetts ; ICES-2019-72
SP  - 1
EP  - 14
ER  - 
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  - JOUR
A1  - Esch, Thomas
A1  - Salber, Wolfgang
A1  - Wolters, Peter
A1  - Geiger, José
A1  - Dilthey, Jochen
T1  - Synergies of variable valve actuation and direct injection
JF  - Direct injection SI engine technology 2002 : [SAE 2002 world congress, Detroit, Michigan, USA, March 4 - 7, 2002].
Y1  - 2002
SN  - 0-7680-0961-8
N1  - Konferenz-Einzelbericht
SP  - 45
EP  - 53
PB  - Society of Automotive Engineers
CY  - Warrendale, Pa
ER  - 
TY  - JOUR
A1  - Havermann, Marc
T1  - Systematic Shock Tube Experiments on Vortex Ring Generation and Propagation / Havermann, M. ; Kainuma, M. ; Takayama, K.
JF  - Shock waves : proceedings of the 25th International Symposium on Shock Waves-ISSW25, July 17 - 22, 2005, Bangalore, India / ed.: G. Jagadeesh
Y1  - 2006
SN  - 978-81-7371571-6
N1  - International Symposium on Shock Waves ; 25 (Bangalore) : 2005.07.17-22
ISSW ; 25 (Bangalore) : 2005.07.17-22
PB  - Universities Pr.
CY  - Hyderabad
ER  - 
TY  - BOOK
A1  - Havermann, Marc
T1  - Systematische Versuche zur Ringwirbelerzeugung mit Stoßrohren / Havermann, M. [Ed. Institut Franco-Allemand de Recherches de Saint-Louis]
Y1  - 2004
N1  - Bericht / ISL/AGARD ; R 110/2004
PB  - ISL
CY  - Saint-Louis
ER  - 
TY  - JOUR
A1  - Maurischat, Andreas
A1  - Perkins, Rudolph
T1  - Taylor coefficients of Anderson generating functions and Drinfeld torsion extensions
N2  - We generalize our work on Carlitz prime power torsion extension to torsion extensions of Drinfeld modules of arbitrary rank. As in the Carlitz case, we give a description of these extensions in terms of evaluations of Anderson generating functions and their hyperderivatives at roots of unity. We also give a direct proof that the image of the Galois representation attached to the p-adic Tate module lies in the p-adic points of the motivic Galois group. This is a generalization of the corresponding result of Chang and Papanikolas for the t-adic case.
Y1  - 2020
U6  - http://dx.doi.org/10.1142/S1793042122500099
IS  - Vol. 18, No. 01
SP  - 113
EP  - 130
PB  - World Scientific
CY  - Singapur
ER  - 
TY  - CHAP
A1  - Plescher, Engelbert
A1  - Mathiak, Gerhard
A1  - Willnecker, Rainer
T1  - Technical aspects of liquid diffusion model experiments
T2  - 55th International Astronautical Congress : October 4 - 8, 2004, Vancouver, Canada / International Astronautical Federation. Bd. 8. IAC-04-J.5.04
Y1  - 2005
SP  - 5019
EP  - 5025
PB  - International Astronautical Federation
CY  - Paris
ER  - 
TY  - JOUR
A1  - Wittmann, Klaus
A1  - Ulamec, S.
A1  - Feuerbacher, B.
A1  - Rosenbauer, H.
T1  - Technical Challenge, Scientific Thrill: A Long Term Lander on an Active Comet
JF  - Lunar and Planetary Science. 26 (1995)
Y1  - 1995
SN  - 0270-9511
N1  - Proceedings of the 26th Lunar and Planetary Science Conference / org. by Lunar and Planetary Institute, Houston Texas
SP  - 1431
EP  - 1432
ER  - 
TY  - BOOK
A1  - Esch, Thomas
T1  - Technische Thermodynamik
Y1  - 2005
PB  - Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Breitschuh, S.
A1  - Graber, S.
A1  - Hagemann, Hans-Jürgen
A1  - Hemdt, A. vom
A1  - Schmitz, Günter
T1  - Telematiklabore mit LabVIEW in der Ingenieurausbildung
JF  - Virtuelle Instrumente in der Praxis : Messtechnik, Automatisierung ; Begleitband zum Kongress VIP 2003 / Rahman Jamal ; Hans Jaschinski (Hrsg.).
Y1  - 2003
SN  - 3-7785-2908-0
N1  - VIP <2003, München>
SP  - 458
EP  - 464
PB  - Hüthig
CY  - Heidelberg [u.a.]
ER  -