k.m. corker, ph.d.industrial & systems engineering lecture 4 allocation and detailed design ise...

K.M. Corker, Ph.D. Industrial & Systems Engineering

Lecture 4Allocation and Detailed Design

ISE 105 Spring 2006

Notes & Course Materials www.engr.sjsu.edu/kcorker

[email protected]

Kevin Corker

San Jose State University

3/8/05


Review Scope & Bound In System Definition

System Definition Matrix

Needs Objt Criteria Params Var Constrnt

Scope Bound


Example: Domestic Energy

• Needs: – N1: Adequate Supply of refined energy – N2: Adequate Supply of energy reserves– N3: Efficient Utilization of energy– N4: Clean environment


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


World Poverty Map (39 components of poverty)


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


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,)


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


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


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


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


ICOM Leading to Functional Decomposition


Tree Structure


Coffee Example


Technical Performance Measures

• Provide Specific Functional Requirements for each function and subfunction that is measurable – Bandwidth– Reliability requirements– Speed– Operability requirements

…


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


Maximum Weight for Wearable Computer

Weight

Cos

t

Max Cost for Sub Function Element

Max Weight Allowable

Trade Space Weight Cost Trade-off Function


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


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


Detailed Design (Top Down & Bottom Up Tensions)

• Describe in Detail: 1. Subsystems, units, assemblies, people, software,

logistic support for your system(s) & address interrelationships

2. Specification of Performance, physical characteristics, power requirements, maintenance, information requirements for all systems

3. Identify and cost out COTS (commercial off the shelf elements)

4. Develop Systems Models 1. Engineering , prototype or service test model


System Lifecycle Concurrent

System Design & Development

Production Process System Utilization

Development/OPS

Maintenance & Support Capability

Development/OPS

Retirement & System Disposal

k.m. corker, ph.d.industrial & systems engineering lecture 4 allocation and detailed design ise...

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