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- W2922388612 abstract "Ambitious goals for exploring Mars in the comingdecades will push human spaceflight into new territory in duration,distance and isolation. In this regime, loss of system integritydue to some failure becomes especially dire. To that end, muchmeaningful work has centered on designing highly reliable spacesystems with low tolerance to failure. However, this thesisidentifies a gap in space mission safety engineering within therealm of Survivability is the ability of a systemto address failure via contingency operations and to place thesystem in a state in which Loss of Mission, Vehicle or Crew areprevented. Manned space mission survivability is investigated inthe context of decades-out missions - such as a Martian voyage inthe late 2030's - which at the present time exhibit significanttechnological uncertainty. An abstracted breakdownbeginning from assumed mission/campaign objectives and logicallyrequired architectural elements is proposed. Such a generalizedarchitecture allows for a function-based failure and responseanalysis applicable across many possible futures. TheFailure-Survivability Analysis Framework for Early Concepts(Fail-SAFE) is developed which 1) defines a generalizedarchitecture, 2) injects a failure and assesses itsimpact, 3) enumerates and evaluates failure response options and 4)synthesizes these findings into design recommendations to promotesystem survivability. Particular emphasis is placed on thoseresponse options which leverage functional multiplicity, or aredundancy in high-level functions across major architecturalelements that can be substituted in case of failure. The frameworkis applied to two Case Studies. The first investigates adecompression failure during the outbound phases of a Mars transitmission. A Failure Effect Metric is defined which evaluates theimpact and severity of the failure and Object Process Methodologyis employed to determine its downstream effects. Contingencystrategies (i.e. sets of response options) are generated andevaluated for their potential effectiveness. The analysis yielded a108 contingency strategies, when limiting a strategy to a maximumof 4 individual responses. Recommendations to promote survivabilityto the failure are derived from these findings. The second CaseStudy validates the framework by applying it to a historicalscenario - the Apollo 13 failure. The framework reproduces andhighly appraises the successful course of action taken to save thecrew. This validated framework may allow mission planners to designfor survivability from the earliest stages of the architectingprocess, trading a narrowly optimal design for one robust tofailure." @default.
- W2922388612 created "2019-03-22" @default.
- W2922388612 creator A5036184917 @default.
- W2922388612 date "2018-01-01" @default.
- W2922388612 modified "2023-09-23" @default.
- W2922388612 title "Survivability in Mars transit architectures : analysis framework for failure contingency strategies" @default.
- W2922388612 hasPublicationYear "2018" @default.
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