TY - GEN
T1 - Prediction of reliability and cost for environmental control and life support systems
AU - Jiang, Haibei
AU - Rodríguez, Luis F.
AU - Bell, Scott
AU - Kortenkamp, David
AU - Capristan, Francisco
PY - 2008
Y1 - 2008
N2 - An increasing awareness of life support system reliability has been noticed in the aerospace community as long-term space missions become realistic objectives. However, system reliability requirements are subject to many constraints, particularly the mission cost. This paper presents a coupled analysis of cost and reliability for optimal exploration life support system design. Simulation tools capable of representing complex dynamical systems with configurable uncertainties are utilized for reliability prediction in comparison with the classical reliability prediction approaches. The motivation of this work emerged from the understanding of the conventional reliability prediction approaches and the currently proposed life support system reliability designs for CEV, Lunar Outposts, and other long-term missions. Literature review indicates a significant knowledge gap in the accurate evaluation of the reliability of environmental control and life support systems. Such a gap is believed to result from the unique characteristics associated with ECLSS and other environmental systems. The results presented in this paper consider the difference between reliability prediction results obtained from the traditional approaches and the newly developed method which has been adjusted to address the new challenge. Simulation and statistical analysis are utilized to quantify the impact of buffering capacity, contingency plans, and maintenance strategies on reliability prediction for ECLSS. A brief investigation of the system cost will also be performed to provide preliminary suggestions for balancing system reliability requirements and the associated costs.
AB - An increasing awareness of life support system reliability has been noticed in the aerospace community as long-term space missions become realistic objectives. However, system reliability requirements are subject to many constraints, particularly the mission cost. This paper presents a coupled analysis of cost and reliability for optimal exploration life support system design. Simulation tools capable of representing complex dynamical systems with configurable uncertainties are utilized for reliability prediction in comparison with the classical reliability prediction approaches. The motivation of this work emerged from the understanding of the conventional reliability prediction approaches and the currently proposed life support system reliability designs for CEV, Lunar Outposts, and other long-term missions. Literature review indicates a significant knowledge gap in the accurate evaluation of the reliability of environmental control and life support systems. Such a gap is believed to result from the unique characteristics associated with ECLSS and other environmental systems. The results presented in this paper consider the difference between reliability prediction results obtained from the traditional approaches and the newly developed method which has been adjusted to address the new challenge. Simulation and statistical analysis are utilized to quantify the impact of buffering capacity, contingency plans, and maintenance strategies on reliability prediction for ECLSS. A brief investigation of the system cost will also be performed to provide preliminary suggestions for balancing system reliability requirements and the associated costs.
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U2 - 10.2514/6.2008-7818
DO - 10.2514/6.2008-7818
M3 - Conference contribution
AN - SCOPUS:78049495994
SN - 9781563479465
T3 - Space 2008 Conference
BT - Space 2008 Conference
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - Space 2008 Conference
Y2 - 9 September 2008 through 11 September 2008
ER -