ECE362 Principles of Design Conceptual and Detail Design Page 1

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 Verification Reporting Stage 3 – Test, Verification, & Reporting Stage 4 –Manufacturing, Sales, & Distribution Manufacturing Sales Distribution This process is part of what we call Systems Engineering Deliver Product = $$$ Page 2

Conceptual Design Generate ideas about HOW to fulfill the PDS. What materials, technologies and processes will be used? Will you use a tried and true approach or will you try a potentially revolutionary, yet unproven, approach? Evaluate ideas – Pugh Matrix Method Page 3

Evaluation of Ideas Evaluation Criteria are established before any evaluations are made. Evaluation Criteria come from the PDS. Evaluation Criteria are unambiguous. Evaluation Criteria are to evaluate, not to optimize different approaches. Page 4

Pugh Matrix Technique I Set up a matrix (table) with concepts across the columns and criteria across the rows. Rate each concept against important evaluation criteria (generated from PDS). Page 5

Pugh Matrix Technique II Choose a reference concept; without any prior solution, choose the one the group intuitively thinks is the “best.” Enter a PLUS (+) if a concept is better than the datum; enter a MINUS (-) if a concept is worse than the datum; enter an S if a concept is the same as the datum. Total the PLUSes and MINUSes for each concept and obtain the algebraic sum for each concept. Page 6

Evaluation of Ideas – Pugh Method Page 7

Pugh Matrix Technique III Carefully look at the pattern of MINUSes; try to generate improvements to the concept without eroding the PLUSes. If a number of strong concepts do not emerge, usually the criteria are ambiguous or subject to different interpretations or concepts are similar. When one concept is strongest, re-run the matrix using it as the datum to validate it as the strongest. Page 8

Pugh Matrix Technique IV Greater insight into the requirements of the PDS. Greater understanding of the design problems. Greater understanding of the potential solutions. Understanding of the interaction between the solutions. Knowledge of why one concept is stronger or weaker than another. Natural stimulus to generate other concepts. Page 9

Detail Design Specific details are determined. The sort of design in individual courses, but with interactions between subsystems. Subsystems and components must be defined in a similar manner to the PDS. Generate Component Design Specification (CDS) with emphasis on local performance, environment, and constraints. Primary emphasis is upon performance. Page 10

Potential Project Ideas Evaluation Determine criteria by which potential project ideas will be evaluated. Set up Pugh Matrix for evaluation. Iterate process with 1st choice as datum. Develop 1st draft of HLD and PDS for chosen idea. Page 11

Assignments TEAM ASSIGNMENT – Complete a PDS for the ECE laboratory due on Thursday, Dec 11. TEAM ASSIGNMENT - Draft 1 – HLD and PDS of Potential Project due on Friday, Dec 12. Page 12