ECE 362 Principles of Design Conceptual and Detail
- Slides: 12
ECE 362 Principles of Design Conceptual and Detail Design Session 6 Page 1 1
High Level Design Stage 1 – Needs, System Definition, & PDS or Requirements Specification Needs and Marketing System Definition Requirements Specifications Stage 2 – Design High Level Design Conceptual Design Detail Design Test Verification Reporting Sales Distribution Stage 3 – Test, Verification, & Reporting Stage 4 –Manufacturing, Manufacturing Sales, & Distribution This process is part of what we call Systems Engineering Session 6 Deliver Product = $$$ Page 2 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 Session 6 Page 3 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. Session 6 Page 4 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). Session 6 Page 5 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. Session 6 Page 6 6
Evaluation of Ideas – Pugh Method Session 6 Page 7 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. Session 6 Page 8 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. Session 6 Page 9 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. Session 6 Page 10 10
Potential Project Ideas Evaluation • Determine criteria by which potential project ideas will be evaluated. • Set up Pugh Matrix for evaluation. • Iterate process with 1 st choice as datum. • Develop 1 st draft of HLD and PDS for chosen idea. Session 6 Page 11 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. Session 6 Page 12 12