S. Belz, Britta Ganzer, Ernst Messerschmid, K. Andreas Friedrich, Ulrike Schmid‐Staiger,
Abstract The development of regenerative and sustainable life support systems (LSS) is a basic prerequisite to realize human long-term habitation in space. An efficient and reliable LSS is of high importance for assembling a future research base on the Moon and for further human space exploration missions beyond Low Earth Orbit. Because of longer distance to Earth and longer transfer times new requirements appear for LSS operation and functionality in comparison to the International Space Station. ...
Tópico(s): Algal biology and biofuel production
2011 - Elsevier BV | Aerospace Science and Technology
Britta Ganzer, Ernst Messerschmid,
The ability to conduct human space exploration is closely coupled to the capabilities of new regenerative life support systems to be operated on autonomous space habitats. Thereby, the minimization of system and re-supply mass, food in particular, is crucial. For that reason the integration of an algal photobioreactor (PBR) into an environmental control and life support system (ECLSS) aboard a space station accommodating up to six astronauts was investigated. This research focused on the performance ...
Tópico(s): Spaceflight effects on biology
2009 - Elsevier BV | Acta Astronautica
Frank Zimmermann, Ulrich M. Schöttle, Ernst Messerschmid,
This paper presents the mission analysis of a tether-assisted payload retrieval from the International Space Station (ISS). The objective is to assess all relevant phases of such a mission in order to allow a comparison with a conventional mission employing a propulsive deorbitation. The controlled tether deployment procedure and the guided return flight of the released re-entry capsule are optimized. A preferable deployment strategy is identified that allows for favorable entry conditions and low ...
Tópico(s): Spacecraft Dynamics and Control
2005 - Elsevier BV | Aerospace Science and Technology
B. Glocker, Godehard Nentwig, Ernst Messerschmid,
At the transferzentrum raumfahrt (TZR), a new plasma torch system for steam and other oxygen and carbon containing gases has been developed and qualified for different applications. Together with this torch, the complete operating subsystems were developed including the steam generator, the cooling system and the power supply. The main investigations were conducted in the 10 kW power range. The torch itself can be operated from 8–35 kW. The torch was optimized for steam as plasma gas but also tested ...
Tópico(s): Plasma Applications and Diagnostics
2000 - Elsevier BV | Vacuum
Ernst Messerschmid, Reinhold Bertrand,
1 Introduction.- 2 History and Current Development.- 3 Orbital Environment.- 4 Environmental Control and Life Support System.- 5 Power and Thermal Control System.- 6 Attitude and Orbit Control System.- 7 Utilization.- 8 Microgravity.- 9 System Engineering.- 10 Synergisms.- 11 Human Factors.- 12 Logistics, Communications and Operation.- 13 The International Space Station.- References.- Fundamental Constants.
Tópico(s): Spacecraft Design and Technology
1999 - Emerald Publishing Limited | Aircraft Engineering and Aerospace Technology
Ch Audy, Mario Fischer, Ernst Messerschmid,
In the first part of this paper, a solar dynamic power system with a Stirling engine for space station application is described. Its unsteady behaviour is theoretically modelled and numerically simulated for four representative orbit configurations. The results are compared to that of a solar dynamic power module with a Brayton gas turbine. In the second part, it is shown that the complex nonsteady behaviour of solar dynamic power modules with either the Brayton cycle or Stirling cycle can be analysed ...
Tópico(s): Thermodynamic and Exergetic Analyses of Power and Cooling Systems
1999 - Elsevier BV | Aerospace Science and Technology
Monika Auweter‐Kurtz, B. Glocker, Thomas Golz, Helmut Kurtz, Ernst Messerschmid, Martin Riehle, Dieter Zube,
For several years an intensive program has been in progress at the University of Stuttgart to investigate and develop thermal arcjets for propellants including ammonia, nitrogen-hydrogen mixtures simulating hydrazine, and hydrogen. Since hydrogen yields the highest specific impulse /sp and best efficiencies TJ, special emphasis was placed on this propellant. Arcjet power levels between 0.7-150 kW have been studied, including water- and radiation-cooled laboratory models and flight hardware. Results ...
Tópico(s): Computational Fluid Dynamics and Aerodynamics
1996 - American Institute of Aeronautics and Astronautics | Journal of Propulsion and Power
O. Knab, H.-H. Fruehauf, Ernst Messerschmid,
A consistent thermochemical relaxation model is presented that has been derived on the basis of 7 ib,Boltzmann populated vibrational energy modes and truncated harmonic oscillators. A persistent application of these two assumptions to all types of chemical reactions with molecular reactants leads to the coupled vibrationchemistry-vibration model (CVCV model), which specifies multiple temperature rate constants and vibrational energies transferred due to chemical reactions in a consistent way. The ...
Tópico(s): Quantum, superfluid, helium dynamics
1995 - American Institute of Aeronautics and Astronautics | Journal of Thermophysics and Heat Transfer
Wubbo Ockels, Reinhard Furrer, Ernst Messerschmid,
Tópico(s): Space Exploration and Technology
1990 - Springer Science+Business Media | Experimental Brain Research
Wubbo Ockels, Reinhard Furrer, Ernst Messerschmid,
Tópico(s): Spaceflight effects on biology
1989 - Nature Portfolio | Nature
Eberhard Keil, Ernst Messerschmid,
A computational method has been developed to stimulate the longitudinal motion of a relativistic beam charged particles circulating in a strong focusing method has been synchrotron or storage ring. Unlike most analytical approaches the stimulation is not restricted to small pertubations and thus the growth of instabilities can be followed into the non-linear region. The investigations show that, as a result of an instability, the final energy spread of an initially unbunched beam interacting with ...
Tópico(s): Gyrotron and Vacuum Electronics Research
1975 - Elsevier BV | Nuclear Instruments and Methods
Tópico(s): Gyrotron and Vacuum Electronics Research
1976 - Elsevier BV | Nuclear Instruments and Methods
Ernst Messerschmid, Dieter Zube, K. Meinzer, Helmut Kurtz,
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Tópico(s): Satellite Communication Systems
1996 - American Institute of Aeronautics and Astronautics | Journal of Spacecraft and Rockets
Aline K. Zimmer, Ernst Messerschmid,
Missions to Near-Earth Asteroids (NEAs) offer a wide range of possibilities for space exploration, scientific research, and technology demonstration. In particular, manned missions to NEAs provide a unique opportunity to be the first human expedition to an interplanetary body beyond the Earth–Moon system and represent the perfect environment to gain experience in deep-space operations, which is an indispensable prerequisite for human missions to Mars. As a starting point for the analysis of such ...
Tópico(s): Space Satellite Systems and Control
2011 - Elsevier BV | Acta Astronautica
S. Kanne, H.-H. Frühauf, Ernst Messerschmid,
A consistent thermochemical relaxation model is presented to calculate high enthalpy flows in a wide velocity and density range. It is based on the coupled vibration-chemistry-vibration model. All types of internal energy, vibrational, rotational, and electronic energy are taken into account. The reaction rate modeling is calibrated using quasi-classical trajectory calculations for dissociation and exchange reactions. The electronic excitation is calculated using quasi-steady-state theory. Radiation ...
Tópico(s): Combustion and flame dynamics
2000 - American Institute of Aeronautics and Astronautics | Journal of Thermophysics and Heat Transfer
Florian Renk, M. Hechler, Ernst Messerschmid,
The Astronautics and Space Station Department of the Universitaet Stuttgart has developed a design environment for the conceptual design of manned space missions. With the assistance of the ESA European Space Operations Center this design environment has been extended to cover exploration missions involving the areas of the collinear Earth–Moon and Sun–Earth libration points, which are of interest as an alternative staging location to the low lunar orbit approach for lunar exploration and for satellite ...
Tópico(s): Space Satellite Systems and Control
2009 - Elsevier BV | Acta Astronautica
T. Gogel, Marc Dupuis, Ernst Messerschmid,
A Monte Carlo method to determine radiative source terms and boundary heat fluxes for generic, twodimensional axisymmetric geometries was developed. For the geometrical discretization, curvilinear structured grids have to be used. Thus, it is possible to use essentially the same grid as for the initial flowfield computation. The spectral behavior of gas radiation was considered as well as thermochemical nonequilibrium conditions of the medium using the NEQAIR code system. The radiation process is ...
Tópico(s): Computational Fluid Dynamics and Aerodynamics
1994 - American Institute of Aeronautics and Astronautics | Journal of Thermophysics and Heat Transfer
Kian Yazdi, Ernst Messerschmid,
Future space exploration activities very likely will incorporate a large number of human missions to various locations on the Moon surface and other destinations near the Earth–Moon system. A wide range of space infrastructure elements will be required in low Earth orbit and waypoints to these destinations. It is reasonable to start assembly and mission logistics from today's frequently used near-Earth orbits, such as the orbit of the International Space Station (ISS). This allows for using launch ...
Tópico(s): Space Science and Extraterrestrial Life
2007 - Elsevier BV | Aerospace Science and Technology
Felix Huber, Ernst Messerschmid, Gerald A. Smith,
Einstein's weak equivalence principle (WEP) states that gravitational mass is identical to inertial mass. This hypothesis has withstood experimental tests to an impressive accuracy of one part in 1011. Various hypotheses based on theory and observations with matter suggest violations of WEP for antimatter may exist anywhere from the one part in 106 to the 200% level. An observed violation at any level would have a profound impact, e.g. it would offer an explanation as to why matter and antimatter ...
Tópico(s): Relativity and Gravitational Theory
2001 - IOP Publishing | Classical and Quantum Gravity
Felix Huber, R. A. Lewis, Ernst Messerschmid, Gerald A. Smith,
Abstract Einstein's Weak Equivalence Principle (WEP) states that gravitational mass is identical to inertial mass. This hypothesis has withstood experimental tests to an impressive accuracy of one part in one hundred billion. Various hypotheses based on theory and observations with matter suggest violations of WEP for antimatter may exist anywhere from the one part per million to the 200% level. An observed violation at any level would have a profound impact, e.g. it would offer an explanation of ...
Tópico(s): Biofield Effects and Biophysics
2000 - Elsevier BV | Advances in Space Research
Kian Yazdi, Ernst Messerschmid,
Abstract Future human space exploration activities will very likely incorporate space stations and platforms located in the Earth–Moon system, in particular in lunar orbit or in the Lagrange points. It is reasonable to start assembly and mission logistics from today's frequently used near-Earth orbits, such as the ISS orbit, in order to utilize common launcher systems and other infrastructure elements. This contribution deals with the conceptual design of cis-lunar space missions and presents results ...
Tópico(s): Space Satellite Systems and Control
2004 - Elsevier BV | Acta Astronautica
A theory for the fast longitudinal blowup of individual bunches (the microwave instability) is given. The predictions of this theory are consistent with experimental observations of the behavior of bunched proton beams. A numerical simulation is used to test the theory. Very good agreement is obtained. It is remarked that since the development of the instability is on a time scale where electrons and protons are equivalent, the theory should be applicable to the bunch lengthening phenomenon in electron ...
Tópico(s): Gyrotron and Vacuum Electronics Research
1977 - Elsevier BV | Nuclear Instruments and Methods
Otto Loesener, Monika Auweter‐Kurtz, M. Hartling, Ernst Messerschmid,
Simulated re-entry tests of reusable thermal protection systems for spacecraft are being conducted in an arc-heated, high-enthalpy wind tunnel. The surface temperature is usually measured by remote pyrometers. Since the material is heated by the radiating plasma, signal disturbances are present when measuring through the plasma. Furthermore the normal spectral emittance is subject to changes, depending on plasma conditions. In order to avoid these drawbacks a new kind of pyrometer for the measurement ...
Tópico(s): Spacecraft Design and Technology
1993 - American Institute of Aeronautics and Astronautics | Journal of Thermophysics and Heat Transfer
Jan Osburg, Reinhold Bertrand, Ernst Messerschmid,
A new software tool, MELISSA, has been developed for the simulation of life-support systems and other network-type subsystems. MELISSA features an intuitive graphical modeling environment and interactive simulation execution. Applications of MELISSA range from the analysis and validation of new ECLSS designs, to parametric optimization studies, to failure mode effects and criticality analysis of life-support systems. Additionally, MELISSA can be employed for training ECLSS developers and users, ...
Tópico(s): Quality Function Deployment in Product Design
1998 - | SAE technical papers on CD-ROM/SAE technical paper series
Ernst Messerschmid, Jean-Pierre Haigneré, K. Damian, Volker Damann,
Tópico(s): Spacecraft Design and Technology
2003 - Elsevier BV | Acta Astronautica
M. Rahn, Ulrich M. Schöttle, Ernst Messerschmid,
Abstract The objective of this paper is to analyse the impact of mission requirements and constraints on both the optimum vehicle design and the effects on flight path selection for two types of reusable two-stage-to-orbit launch vehicles. The first vehicle type considered provides horizontal take-off and landing capabilities and is intended to be propelled by an airbreathing propulsion system during stage 1 flight. The second vehicle type assumes a vertical launch and is accelerated by a rocket ...
Tópico(s): Spacecraft and Cryogenic Technologies
1999 - Elsevier BV | Aerospace Science and Technology
T. Gogel, Monika Auweter‐Kurtz, Thomas Golz, Ernst Messerschmid, H. O. Schrade, P. C. Sleziona,
Abstract For the investigation of the flow field in the test chambers of the plasma wind tunnels existing at the Institut fur Raumfahrtsysteme (IRS) a two-dimensional, axisymmetric program system has been developed. This code is employed to examine the flow features in the test section of the wind tunnel PWK2 of the IRS. The program system consists of a Navier-Stokes flowfield solver, a solution program of the electron energy equation yielding the electron temperature and a code for the evaluation ...
Tópico(s): Ionosphere and magnetosphere dynamics
1991 - Elsevier BV | Computer Methods in Applied Mechanics and Engineering
Gisela Detrell, Eulàlia Gríful i Ponsati, Ernst Messerschmid,
The aim of this paper is to optimize reliability and mass of three CO2 extraction technologies/components: the 4-Bed Molecular Sieve, the Electrochemical Depolarized Concentrator and the Solid Amine Water Desorption. The first one is currently used in the International Space Station and the last two are being developed, and could be used for future long duration missions. This work is part of a complex study of the Environmental Control and Life Support System (ECLSS) reliability. The result of this ...
Tópico(s): Carbon Dioxide Capture Technologies
2016 - Elsevier BV | Advances in Space Research
Jan Osburg, Ernst Messerschmid,
Tópico(s): Systems Engineering Methodologies and Applications
2000 - | SAE technical papers on CD-ROM/SAE technical paper series
Andreas Schwer, Ulrich M. Schöttle, Ernst Messerschmid,
Tópico(s): Space Satellite Systems and Control
1996 - Elsevier BV | Acta Astronautica