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This page outlines the high-level design process for systems engineering, including needs assessment, system definition, requirements specification, conceptual design, detail design, testing, verification, reporting, and manufacturing. It also introduces the Pugh Matrix evaluation method.
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ECE362Principles 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
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 Projectdue on Friday, Dec 12. Page 12
