Towards a Framework for Reliability and Safety Analysis of Complex Space Missions

2017 ◽  
Author(s):  
John W. Evans ◽  
Frank J. Groen ◽  
Lui Wang ◽  
Rebekah Austin ◽  
Arthur Witulski ◽  
...  
Keyword(s):  
Complex Space ◽  
Safety Analysis ◽  
Space Missions

Towards a framework for reliability and safety analysis of complex space missions

2018 ◽  
Vol 6 (2/3) ◽  
pp. 203
Author(s):  
John W. Evans ◽  
Frank Groen ◽  
Lui Wang ◽  
Shira Okon ◽  
Rebekah Austin ◽  
...  
Keyword(s):  
Complex Space ◽  
Safety Analysis ◽  
Space Missions

Towards a framework for reliability and safety analysis of complex space missions

2018 ◽  
Vol 6 (2/3) ◽  
pp. 203
Author(s):  
Nancy Lindsey ◽  
John W. Evans ◽  
Frank Groen ◽  
Lui Wang ◽  
Shira Okon ◽  
...  
Keyword(s):  
Complex Space ◽  
Safety Analysis ◽  
Space Missions

Methodology for requirements definition of complex space missions and systems

2015 ◽  
Vol 114 ◽  
pp. 79-92 ◽  
Author(s):  
Maria Antonietta Viscio ◽  
Nicole Viola ◽  
Roberta Fusaro ◽  
Valter Basso
Keyword(s):  
Complex Space ◽  
Space Missions ◽  
Requirements Definition ◽  
Definition Of

A Function-Based Methodology for Analyzing Critical Events

2006 ◽  
Author(s):  
Ryan S. Hutcheson ◽  
Daniel A. McAdams ◽  
Robert B. Stone ◽  
Irem Y. Tumer
Keyword(s):  
Complex Space ◽  
Space Missions ◽  
Critical Events ◽  
Event Models

The objective of this research was to develop a function-based method for analyzing the critical sequences of events that must occur for complex space missions to be successful. The resulting methodology, the Function-based Analysis of Critical Events, or FACE, uses functional and event models to identify the changes in functionality of a system as it transitions between critical mission events. Two examples are presented that detail the application of FACE to prior mission failures including the loss of the Columbia orbiter and the failure of the Mars Polar Lander probe. The result of the research is a methodology that allows designers to not only reduce the occurrence of such failures but also analyze the specific functional causes of the failures when they do occur.

Overview of the Safety Analyses and Risk Assessments of Nuclear Space Missions

2007 ◽  
Author(s):  
Peter G. Prassinos ◽  
John W. Lyver
Keyword(s):  
Solar System ◽  
Atmospheric Transport ◽  
Electrical Power ◽  
Safety Analysis ◽  
Nuclear Material ◽  
Space Mission ◽  
Space Missions ◽  
Radioactive Material ◽  
Nuclear Space ◽  
Space Vehicles

Space missions are conducted to gain an understanding of the universe and our solar system; to study the surface of planets other than earth; and to explore our extraterrestrial environment. Many of these missions travel to the far reaches of the solar system or explore regions that require a continuous source of electrical power that is more than what is available from the conversion of solar energy. For these space missions, electrical power is supplied by a radioisotope thermoelectric generator (RTG) that uses the heat generated by the decay radioactive material. The approval to launch and fly space vehicles using nuclear material is governed by Presidential Directive and requires authorization by the Executive Office of the President. As part of the launch approval process for these missions, a comprehensive safety analysis is conducted. This safety analysis employs a full-scope probabilistic risk assessment (PRA) to help identify improvement in launch and flight systems and quantify the risk associated with potential accidents and abort conditions during the mission. In general, the PRA follows a typical scenario-based assessment similar to PRAs that have been conducted for terrestrial hazardous facilities and operations. However, there are some significant differences when conducting a PRA of a space mission. This paper will provide a general overview of the PRA process as applied to nuclear space missions including; defining the analysis objective, system familiarization, accident sequence analysis, accident analysis, atmospheric transport, consequence analysis, and risk integration and uncertainty analysis.

Nuclear Safety Analysis of Snap III for Space Missions

ARS Journal ◽  
1961 ◽  
Vol 31 (12) ◽  
pp. 1744-1751 ◽  
Author(s):  
W. HAGIS ◽  
T. DOBRY ◽  
G. DIX
Keyword(s):  
Safety Analysis ◽  
Space Missions ◽  
Nuclear Safety

scholarly journals Combined Effects of Simulated Microgravity, Low Pressure and Noise Environment on the Intestinal Flora of C57BL/6 Mice

2020 ◽  
Author(s):  
Peiming Sun ◽  
Jiaqi Yang ◽  
Bo Wang ◽  
Huan Ma ◽  
Yin Zhang ◽  
...  
Keyword(s):  
Species Composition ◽  
Theoretical Basis ◽  
Simulated Microgravity ◽  
Complex Space ◽  
Intestinal Flora ◽  
Antibiotic Resistance Genes ◽  
Space Missions ◽  
Combined Effects ◽  
Space Environments ◽  
And Function

Abstract Background: The composition and function of intestinal microbial communities are important for human health. However, these intestinal floras are sensitive to changes in the environment. Adverse changes to intestinal flora can affect the health of astronauts in complex space environments, resulting in difficulties of implementing space missions.Results: Under the influence of different space environmental factors, the species composition at the phylum and genus level were significantly affected by the combined effects environment. Furthermore, screening was conducted to identify biomarkers that could be regarded as environmental markers. And there have also been some noticeable changes in the function of intestinal floras. Moreover, the antibiotic resistance genes (ARGs) were also found to be differently expressed under different environmental conditions.Conclusion: The combined effects environment could significantly affect the species composition, function and the expression of ARGs of intestinal flora which may provide a theoretical basis for space medical supervision and healthcare. Meanwhile, these changes require more attention because they may induce diseases that may further affect performance during space missions.

Seti Space Missions

1997 ◽  
Vol 161 ◽  
pp. 761-776 ◽  
Author(s):  
Claudio Maccone
Keyword(s):  
Electromagnetic Waves ◽  
Space Missions ◽  
Gravitational Lens ◽  
The Sun ◽  
Space Antenna ◽  
Focal Distance ◽  
Large Space ◽  
The Earth ◽  
Space Antennas ◽  
New Space

AbstractSETI from space is currently envisaged in three ways: i) by large space antennas orbiting the Earth that could be used for both VLBI and SETI (VSOP and RadioAstron missions), ii) by a radiotelescope inside the Saha far side Moon crater and an Earth-link antenna on the Mare Smythii near side plain. Such SETIMOON mission would require no astronaut work since a Tether, deployed in Moon orbit until the two antennas landed softly, would also be the cable connecting them. Alternatively, a data relay satellite orbiting the Earth-Moon Lagrangian pointL2would avoid the Earthlink antenna, iii) by a large space antenna put at the foci of the Sun gravitational lens: 1) for electromagnetic waves, the minimal focal distance is 550 Astronomical Units (AU) or 14 times beyond Pluto. One could use the huge radio magnifications of sources aligned to the Sun and spacecraft; 2) for gravitational waves and neutrinos, the focus lies between 22.45 and 29.59 AU (Uranus and Neptune orbits), with a flight time of less than 30 years. Two new space missions, of SETI interest if ET’s use neutrinos for communications, are proposed.

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