ECE362 Principles of Design

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ECE362Principles of Design

• High Level Design
• and
• PDS

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High Level Design
Stage 1 Needs, System Definition, PDS or
Requirements Specification
Needs and Marketing
System Definition
Requirements Specifications
High Level Design
Conceptual Design
Detail Design
Stage 2 Design
Test
Reporting
Verification
Stage 3 Test, Verification, Reporting
Manufacturing
Stage 4 Manufacturing, Sales, Distribution
Sales
Distribution
This process is part of what we call Systems
Engineering
Deliver Product
ECE362Lec2_app2_W04.ppt
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Sample HLD and PDS
Formulate a High Level Design document and a
Product Design Specification for a residence hall
room for a single resident. HighLevelRequirement
sPDSDormRoomExample.pdf
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Features of a PDS

• Basis for all design decisions
• May serve as a contract
• Dynamic rather than static
• Considers all aspects of the product and its
  interactions
• Good PDS gt Good design
• Include all aspects at beginning, even if at a
  superficial level
• More details as project progresses

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Elements of a PDS

• Performance
• Environment
• Service Life
• Maintenance and repair
• Target Product Cost
• Competition
• Shipping
• Packaging

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Elements of a PDS

• Quantity
• Manufacturing Facility
• Size
• Weight
• Aesthetics, appearance and finish
• Materials
• Production Life Span
• Standards and specifications

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Elements of a PDS

• Ergonomics
• Customer
• Quality/Reliability
• Shelf-Life
• Processes
• Time-scales
• Testing
• Safety

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Elements of a PDS

• Company constraints
• Market constraints
• Patents, literature, product data
• Political and social implications
• Legal
• Installation
• Documentation/Training
• Disposal

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Guidelines for a PDS

• PDS represents what you are trying to achieve,
  not the achievement itself.
• PDS is for you and your colleagues it should be
  written succinctly and clearly.

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Guidelines for a PDS

• Never write a PDS in essay form use short, sharp
  definitive statement leave space for amendments.
• From the beginning quantify parameters, even when
  they are estimates.

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Guidelines for a PDS

• Always date the PDS and put an issue number on
  it.
• Clearly document amendments.
• To gain flexibility, each time start preparing a
  PDS starting from a different specification.
• More details on PDS _at_
• PDS_Guidelines.pdf