Lecture 4
Allocation and Detailed Design
ISE 105 Spring 2006
Notes & Course Materials
www.engr.sjsu.edu/kcorker
Kevin.Corker@sjsu.edu
Kevin Corker
San Jose State University
3/8/05
K.M. Corker, Ph.D.
Industrial & Systems Engineering
System Definition Matrix
Scope
Needs
Objt
Bound
Criteria Params
Var
Constrnt
Review Scope & Bound In System Definition
K.M. Corker, Ph.D.
Industrial & Systems Engineering
Example: Domestic Energy
• Needs:
–
–
–
–
N1: Adequate Supply of refined energy
N2: Adequate Supply of energy reserves
N3: Efficient Utilization of energy
N4: Clean environment
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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
K.M. Corker, Ph.D.
Industrial & Systems Engineering
World Poverty Map (39 components
of poverty)
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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
K.M. Corker, Ph.D.
Industrial & Systems Engineering
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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,)
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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
K.M. Corker, Ph.D.
Industrial & Systems Engineering
ICOM Leading to Functional
Decomposition
K.M. Corker, Ph.D.
Industrial & Systems Engineering
Tree Structure
K.M. Corker, Ph.D.
Industrial & Systems Engineering
Coffee Example
K.M. Corker, Ph.D.
Industrial & Systems Engineering
Technical Performance Measures
• Provide Specific Functional Requirements
for each function and subfunction that is
measurable
– Bandwidth
– Reliability requirements
– Speed
– Operability requirements
…
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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
K.M. Corker, Ph.D.
Industrial & Systems Engineering
Maximum Weight for Wearable Computer
Max Cost for
Sub Function
Element
Trade Space
Cost
Weight Cost Trade-off
Function
Max Weight
Allowable
Weight
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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
K.M. Corker, Ph.D.
Industrial & Systems Engineering
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.
K.M. Corker, Ph.D.
Engineering , prototype or service test model
Industrial & Systems Engineering
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