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MIT16_842F09_lec07

MIT16_842F09_lec07 - 16.842 Fundamentals of Systems...

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16.842 Fundamentals of Systems Engineering Human-Systems Engineering
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V Model – Oct 23, 2009 Systems Engineering Stakeholder Lifecycle y g g Overview Analysis Requirements Commissioning y Management Definition System Architecture Verification and g Operations Cost and Schedule Management Concept Generation Tradespace Exploration C t S l ti System Integration I t f M t Validation Concept Selection Design Definition M l idi i li O i i i Interface Management Human Factors System Safety Multidisciplinary Optimization y
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16.842 Traditional Systems Engineering Process Model* ACQUISITION PHASE UTILIZATION PHASE N E E D Conceptual- Preliminary Design Detail Design and Development Production and/or Construction Product Use, Phaseou Disposal t, and Operational requirements drive technical f hi h d i h f t performance measures which drive human factors requirements….. – Human considerations often are low p riority *Blanchard, B. S., & Fabrycky, W. J. (1998). Systems Engineering and Analysis (3rd ed.). Upper Saddle River, NJ: Prentice Hall.
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Or stuck out on the periphery… Systems Engineering Stakeholder Lifecycle 16.842 y g g Overview Analysis Requirements Commissioning y Management Definition System Architecture Verification and g Operations Cost and Schedule Management Concept Generation Tradespace Exploration C t S l ti System Integration I t f M t Validation Concept Selection Design Definition M l idi i li O i i i Interface Management Human Factors System Safety Multidisciplinary Optimization y
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Results of “Classic” SE Methods 16.842 These images have been removed due to copyright restrictions.
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16.842 Three Mile Island March 28 th , 1979 Main feedwater pump failure, caused reactor to shut down R li f Relief valve opened to reduce pressure but became stuck in the open position No indication to controllers No indication to controllers – Valve failure led to a loss of reactant coolant water No instrument showed the coolant level in the reactor Operators thought relief valve closed & water level too high i h High stress Overrode emergency relief pump
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Three Mile Island, cont. 16 842 16.842 System worked as designed, automation worked correctly – Confirmation bias: people seek out information to confirm a prior belief and discount information that does not support this belief support this belief – Operators selectively filtered out data from other gauges to support their hypothesis that coolant level was too high This image has been removed due to copyright restrictions.
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16.842 The Spiral Systems Engineering Process Model* *Boehm, B. (1988). A Spiral Model of Software Development and Enhancement. Computer, 61-72. Risk analysis Risk analysis Risk analysis Risk anal RQTS plan life cycle plan Concept of operation Emulations Software RQTS Requirements validation Development plan Proto- type 1 Prototype 2 Prototype 3 Operational prototype Benchmarks Models Detailed design Code Unit test Design validation and verification Integration and test Develop, verify next level product Plan next phases
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