Kevin Corker San Jose State University 3/8/05

1. Lecture 4Allocation and Detailed Design ISE 105 Spring 2006Notes & Course Materials www.engr.sjsu.edu/kcorkerKevin.Corker@sjsu.edu Kevin Corker San Jose State University 3/8/05

2. System Definition Matrix Review Scope & Bound In System Definition Scope Bound Needs Objt Criteria Params Var Constrnt

3. Example: Domestic Energy • Needs: • N1: Adequate Supply of refined energy • N2: Adequate Supply of energy reserves • N3: Efficient Utilization of energy • N4: Clean environment

4. Objectives • Adequate Gasoline supply • Adequate Oil supply • Improve US refining capacity • Develop energy reserves • Improve US access to reserves • Utilize energy efficiently • Change energy utilization distribution (reduce transportation energy costs) • Develop New energy sources • Bio-diesel • Develop New Energy forms • Strong-Force electrodynamics • Change standard of living • Clean Environment

5. World Poverty Map (39 components of poverty)

6. Criteria • Supply/demand Relationship • Number and volume of reserves • Energy Efficiency Metrics • Number and effectiveness of new sources • Number and effectiveness of new forms • Demographics of live-style • Demographics of Environment

8. Parameters & Variables (those elements of a system which if changed would have a significant effect on the identified needs) • A1: Types of refined energy (gas, oil, home heat, J12 jet fuel…) • A2: new energy sources (nuclear, solar, wind, geothermal…) • A3: Types of existing reserves tapped for development (natural gas, crude, cola, uranium…) • A4: Distribution and use of energy (transportation, industry, homes, offices…) • A5 Foreign energy purchased • A6 Contribution to pollution • A7 Demand • A8 Restrictions (taxes, rationing,)

9. Constraints • C1: Safety • C2: Supply and Reserve availability • C3: Source location (ANWAR) • C4: Reasonable Costs (% GDP) • C5: Low Pollution • C6: Technological (energy available but no known method for distribution) • C7: Funding • C8: Government Regulations and policies • C9: Time available • C10: Standard of living variables

10. System Definition (iteration 2) • Provide a Scope and Bound Matrix for your system • Provide specific needs, objectives, criteria, parameter/variables, and constraints • Due Monday 3/13/06

11. Allocation • You have identified preliminary needs and objectives for your systems • You have identified the technical requirements of (at least) two alternatives to meet those needs • We now need to assign or allocate subsystems to meet those needs

12. Allocation and Evaluation • Subsystems packaging or work breakdown structures assign some part of the total system function to subsystems • Describe the achievement of a functional need broken down into functional subsystems for each of the alternative design approaches • The functional subsystems can then be evaluated for your alternative system designs

13. ICOM Leading to Functional Decomposition

14. Tree Structure

15. Coffee Example

16. Technical Performance Measures • Provide Specific Functional Requirements for each function and subfunction that is measurable • Bandwidth • Reliability requirements • Speed • Operability requirements …

17. Allocation of Mission Specification Requirements • Each functional unit will contribute to meeting the over-all “design-to” specification • The customer priority and the unit costs can be used to guide establishment of design-to specification • Tradeoffs • Between different subfuncitons within a design or • Between functions in alternative designs

18. Max Cost for Sub Function Element Trade Space Weight Cost Trade-off Function Max Weight Allowable Maximum Weight for Wearable Computer Cost Weight

19. Preliminary Design Review Assignment Due 3/15/06 • Provide a System Function Allocation graph for each of two alternative designs for your system– take this the ICOM subsystem functional level • Determine a set of Technical Performance Metrics/Measures for each sub function • Make an allocation graph for two subsystems that you consider critical for two TPMs that you consider critical

20. Detailed Design • You have developed (two) alternatives for a system • You have begun tradeoff analyses by identifying TPMs and allocating function and TPMs • At this point you would make a determination of which design best meets the TPMs • This is a complex evaluation process requiring modeling tools– so we will defer a description of that that decision making process until after we have spoken about models

21. Detailed Design (Top Down & Bottom Up Tensions) • Describe in Detail: • Subsystems, units, assemblies, people, software, logistic support for your system(s) & address interrelationships • Specification of Performance, physical characteristics, power requirements, maintenance, information requirements for all systems • Identify and cost out COTS (commercial off the shelf elements) • Develop Systems Models • Engineering , prototype or service test model

22. System Lifecycle Concurrent System Design & Development Production Process System Utilization Development/OPS Maintenance & Support Capability Development/OPS Retirement & System Disposal