Assessment of Maintainability for Future Human Asteroid and Mars Missions

Stromgren, Chel; Terry, Michelle; Mattfeld, Bryan; Cirillo, William; Goodliff, Kandyce; Shyface, Hilary; Maxwell, Andrew J.

doi:10.2514/6.2013-5328

Cited by 6 publications

(3 citation statements)

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“…An in-depth discussion of risk, reliability, and POS modeling is beyond the scope of this paper; however, a selection of references is provided here that include more detailed descriptions of various modeling approaches. 1,2,8,15,16,27,32,37,38,[40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] Epistemic uncertainty is also a critical consideration for spares and maintenance logistics. 8,36 When failure rates are (or, at least, are assumed to be) deterministically known, POS for a given item is a deterministic value.…”

Section: 44mentioning

confidence: 99%

“…32,54 Since each redundant instance of a system or subsystem effectively supplies only one additional spare for all items within that system or subsystem, multiple redundant copies would be necessary to provide risk mitigation. Spare parts are typically implemented at a lower level than redundancy, and are therefore typically a more mass-efficient approach for risk mitigation.…”

Section: E Redundancymentioning

confidence: 99%

“…Several discrete optimization approaches may be used to determine the minimum-mass spares inventory, which are beyond the scope of this paper; however, a selection of references that describe spares inventory optimization in greater detail is provided here. 2,32,36,40,41,45,48,50,53,54 When ISM is used, raw material for manufacturing is also included in the inventory optimization process.…”

Section: H Spares Inventory Selectionmentioning

confidence: 99%

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Supportability Challenges, Metrics, and Key Decisions for Future Human Spaceflight

Owens

Weck

Stromgren³

et al. 2017

AIAA SPACE and Astronautics Forum and Exposition

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Future crewed missions beyond Low Earth Orbit (LEO) represent a logistical challenge that is unprecedented in human spaceflight. Astronauts will travel farther and stay in space for longer than any previous mission, far from timely abort or resupply from Earth. Under these conditions, supportability -defined as the set of system characteristics that influence the logistics and support required to enable safe and effective operations of systems -will be a much more significant driver of space system lifecycle properties than it has been in the past. This paper presents an overview of supportability for future human spaceflight. The particular challenges of future missions are discussed, with the differences between past, present, and future missions highlighted. The relationship between supportability metrics and mission cost, performance, schedule, and risk is also discussed. A set of proposed strategies for managing supportability is presented -including reliability growth, uncertainty reduction, level of repair, commonality, redundancy, In-Space Manufacturing (ISM) (including the use of material recycling and In-Situ Resource Utilization (ISRU) for spares and maintenance items), reduced complexity, and spares inventory decisions such as the use of predeployed or cached spares -along with a discussion of the potential impacts of each of those strategies. References are provided to various sources that describe these supportability metrics and strategies, as well as associated modeling and optimization techniques, in greater detail. Overall, supportability is an emergent system characteristic and a holistic challenge for future system development. System designers and mission planners must carefully consider and balance the supportability metrics and decisions described in this paper in order to enable safe and effective beyond-LEO human spaceflight.

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