MT2 OL - Systems Engineering MT2 OL I Functional Design A...

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Systems Engineering MT2 OL I. Functional Design A. Discovering Fctl Reqs a. Functional detailing a.i. Aka “functional decomp” – describes hi-lvl fct by means of lo-lvl fcts that working together can achieve hi-lvl fct a.ii. Informal ,intuitive, automatic activity. Basis for concept generation. Formalized for b. Functional abstraction [opposite of detail] b.i. generally o a fctn to include wider design possibilities (eg PENS – ink to paper -> transfer substance to paper > capture strokes > enable strokes in a display medium) b.ii. Abstraction allows for innovation; fresh start, enlarge solution space B. Diagrams/Tools a. Fctl Flo Block Diagram (FFBD): shows fcts that system is to perform & order; control is specified but flow of data is not. a.i. Shows syst fcts in order in which they are enabled/performed. Enabled via reference nodes before it; nodes at end = what functions enabled next. a.ii. Shows completion criterion for functions (eg exits for multi exit fct) a.iii. Template b. IDEF0: shows data flow but doesn’t show sequence/concurrency/control b.i. Template b.ii. Components b.ii.1. Function box w/function name (verb expressing system capability) b.ii.2. Unique identifier (A0 default) b.ii.3. Inputs (material, energy, data; arrows w/nouns enter left) b.ii.4. Outputs (material, energy, info; arrows w/nouns exit right) b.ii.5. Controls/Constraints (info input to function that influences activity ie targets, user decisions; arrows w/nouns enter top) b.ii.6. Resources/Mech (entity used by function but not consumed=resource like maint crew; subsidiary fct not analyzed
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further=mechanism like algo; arrows w/nouns enter bottom) b.iii. Pages b.iii.1. Series of pages describing fctl detailing of capability requirement. b.iii.2. First pg is A-0 with single function A0 (capability req). Next pges present detail of single fct from earlier page (arranged in waterfall w/<=6 fcts/pg) b.iii.3. Pages contain diagram/title w/text descript. Must ID model’s POV in text/title of page A-0 II. Structural Design A. Use Case Diagrams a. Show human-initiated functionality – doesn’t provide all fcts needed in interface mgmt. or show scenario def/analysis b. Provides common understanding among cust/user + engrs c. Actors : Stick figures (don’t interact), connect actors to use cases d. Extends : some use cases extendd another (dashed line w/<<extend>>) e. Includes : two+ use cases include flow of another use case (dashed line w/<<include>>) B. Use Case to Functions a. Start w/context diagram (ER diagram) to provide initial description of context b. Brainstorm then prioritize use cases of how likely to provide fctl reqs c. Describe use-case behaviors – use perspective of actors (need initiating event + fctl req + terminating event) d. All this leads to an expanded context diagram. Then capture reqs from use-case behaviors e. Repeat for secondary use cases and further evolve context diagram. C. Process for Structural Design
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MT2 OL - Systems Engineering MT2 OL I Functional Design A...

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