Lecture 04 PA_&_OA

Lecture 04 PA_&_OA - Session #4 Architectures:- Advanced...

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Unformatted text preview: Session #4 Architectures:- Advanced Functional- Physical - Operational EngM 273: Systems Engineering 2 Class Plan House-Keeping Review of Assignment #2 Mid-term coming up in three weeks time Questions from previous lecture New Content Advanced Functional Architectures (FAs) Functional Flow Block Diagrams (FFBD’s) Enhanced Functional Flow Block Diagrams (EFFBD’s) Physical Architectures (PAs) Generic PA Instantiating a generic PA Operational Architectures (OAs) Assignment #4: Team Assignment “Think it all the way through” item for today 3 Source: Philip Dilts, 4 Systems Engineering Framework CONCEPT DESIGN PRODUCTION OPERATIONS Operational Scenarios Originating Requirements Operational Concept Stakeholder Inputs Derived Requirements System Requirements Document (SRD) Component/CI Requirements System Concept Architectures Qualification Plan Specifications Operational System Lifecycle Support Functional Physical Operational Producibility Manufacturing Packaging Shipping Reliability Maintainability Human Factors (Usability) Supportability Disposability Lifecycle Cost (Affordability) Maintenance Scenarios Objectives Hierarchy Ext. Systems Diagram 5 System Architectures OPERATIONA L CONCEPT FUNCTIONAL ARCHITECTURE PHYSICAL ARCHITECTURE OPERATIONAL ARCHITECTURE Functional What the system must do Physical Components that perform the functions Operational Complete architecture mapping physical components to system functions Example: Vanderbilt Commons What are the: Functional architecture? What does it do? Physical architecture? What does it look like? Operational architecture? How does it work? System Functional Decomposition I 1 O 1 C 1 Simple Function Complex Function A0 I 1 …I n O 1 …O n C 1 …C n Start here A1 A2 A3 Decompose to next level A2.1 A2.3 A2.2 Last level Notes: - 1) numbering conventions 2) constraints Steps in Functional Decomposition 1. List Functions Top-down or bottom-up Hierarchy diagram (no ordering) 2. Do an initial function flow (ordering) i.e., how things would flow during operations Use logical operators: OR / AND / loops 3. Enhance the initial flow (enhanced ordering) Add inputs, outputs, and controls/triggers 8 9 How does the iPhone really function? Provide iPhone Service Provide Cell Phone Service Provide MP3 player … Provide GPS Service What must be done in what order (i.e., flow)? How does the user know what comes first, second, & last? Suppose a call comes in while you’re listening to music? Process User Input A0 A1 A2 A3 A9 10 Possible flow controls among functions OR Functions are mutually exclusive iPhone example?...
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This note was uploaded on 04/08/2008 for the course ENGM 273 taught by Professor Dilts during the Spring '08 term at Vanderbilt.

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Lecture 04 PA_&_OA - Session #4 Architectures:- Advanced...

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