Recent concepts in missions to Mars - Extraterrestrial processes

Ramohalli, Kumar; Lawton, Emil A.; Ash, Robert L.

doi:10.2514/3.23134

Cited by 23 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The long‐term storage and deep space transport of liquid H 2 is, however, a significant problem. This drawback is eliminated in another methodology, which postulates production of CO and O 2 directly by electrolysis of the Martian CO 2 in a zirconia cell 57, 58. The resulting CO and O 2 are then used as a liquid bipropellant.…”

Section: Extraterrestrial Production Of Materials and Propellantsmentioning

confidence: 99%

Heterogeneous combustion: Recent developments and new opportunities for chemical engineers

2005

View full text Add to dashboard Cite

Section: Extraterrestrial Production Of Materials and Propellantsmentioning

confidence: 99%

Heterogeneous combustion: Recent developments and new opportunities for chemical engineers

2005

View full text Add to dashboard Cite

“…It is organized as follows: Section 2 describes an application of the real-time simulation and control methodology to design and test an intelligent controller for an oxygen extraction prototype system. Our main contribution, the extension of DEVS-Scheme to real-time simulation and control, is then discussed in Section 2 Example: Autonomous Oxygen Extraction Plant Ramohalli,et.al.,22] proposed an oxygen extraction system for operation on Mars. Martian CO 2 -rich atmosphere is ltered and compressed to a temperature and pressure suitable for electrocatalysis in a Zirconia-based oxygen cell.…”

Section: Simulation Executivementioning

confidence: 99%

Extending the DEVS-Scheme knowledge-based simulation environment for real-time event-based control

Zeigler

Kim

1993

IEEE Trans. Robot. Automat.

View full text Add to dashboard Cite

This article describes an implementation of real-time simulation and control in DEVS-Scheme, a knowledge-based, discrete event environment. We illustrate a methodology in which the plant, its actuators and sensors are described by discrete event models developed within the event-based control paradigm. A model of the controller is employed to validate its design in a plant/actuator/sensor experimental frame. The same model con guration is then employed for actual control operation by connecting the simulation executive, suitably modi ed, to a programmable controller that interfaces to the real plant/actuator/sensor system. We show how this methodology is supported by real-time interpretation of the DEVS (Discrete Event System Speci cation) formalism. A lower bound on the processing speed of a non-deterministic operating system relative to scheduled event times is derived which guarantees correct control timing. We show how the DEVS-based control can be distributed in a hierarchical manner to ensure that the required deadline time constraints are met. As an example, an intelligent controller is discussed for a prototype oxygen extraction system eventually intended to operate autonomously on Mars. We conclude that DEVS provides a exible discrete event formalism for knowledge-based real-time control applications.

show abstract

“…The use of this reaction to produce oxygen on Mars was first proposed by Dr. Robert Ash at JPL in the 1970s, and since then has been the subject of ongoing research by both Ash (now at Old Dominion University), Kumar Ramohalli and K. R. Sridhar (at the Univ. of Arizona), and Jerry Suitor (at JPL) 16 . The advantage of this process is that it is completely decoupled from any other chemical process, and an infinite amount of oxygen can be so produced without any additional feedstock.…”

Section: Propellant Manufacturing Processesmentioning

confidence: 99%

Methods for achieving long range mobility on Mars

Zubrin¹

1992

28th Joint Propulsion Conference and Exhibit

View full text Add to dashboard Cite

This paper discusses alternative methods for enabling human explorers to achieve long range mobility on the surface of Mars. Vehicle types considered include ground rovers, winged and lighter-than air atmospheric vehicles, and suborbital ballistic vehicles making use of rocket propulsion. Energy sources considered for such vehicles include batteries, fuel cells, radioisotope generators, solar photovoltaics, chemical combustion engines, and nuclear reactors. It is found that the production of fuels and propellants out of indigenous Martian resources greatly enhances the potential for long range mobility, so much so that it may be considered the essential central element of any manned Mars exploration strategy.

show abstract

Recent concepts in missions to Mars - Extraterrestrial processes

Cited by 23 publications

References 5 publications

Heterogeneous combustion: Recent developments and new opportunities for chemical engineers

Heterogeneous combustion: Recent developments and new opportunities for chemical engineers

Extending the DEVS-Scheme knowledge-based simulation environment for real-time event-based control

Methods for achieving long range mobility on Mars

Contact Info

Product

Resources

About