R. I. T Mechanical Engineering Design Concepts and Selection Design Project Management Rochester Institute of Technology Mechanical Engineering Department Rochester, NY USA

R. I. T Mechanical Engineering Session Objectives Motivation Examples Suggestions Work time

R. I. T Mechanical Engineering Session Objectives Motivation Morphological Chart Pugh Concept Selection Work time

R. I. T Mechanical Engineering What are we talking about? Morphological chart Brainstormed ideas around functions → complete system design concepts Concept selection Structured approach to finding the best available design to pursue, based on a set of objective criteria

R. I. T Mechanical Engineering “Why do I have to do this in DPM?” Morphological chart Identify potential system solutions for your project Help identify required staffing Lead your team through the process in MSD Concept Selection Start thinking about important selection criteria Identify which potential system solutions are more likely to be successful Lead your team through the process in MSD Structure helps to eliminate bias in concept selection

R. I. T Mechanical Engineering Session Objectives Motivation Morphological Chart Pugh Concept Selection Work time

R. I. T Mechanical Engineering Creating Complete Design Concepts First step = reduce list of ideas to manageable option. We’ll use Pareto Voting Done by function – not on complete concepts Focus on functions where you generated many concepts Each team member gets 5 votes (20% of # ideas generated); cast them for the most promising of your team’s ideas as you see fit. Use this to eliminate concepts that involve things like elves, fairies, and traveling faster than the speed of light

R. I. T Mechanical Engineering Next: Functions vs. Means Functions Function AFunction BFunction CFunction D A1B1C1D1 A2B2C2D2 A3B3C3D3 A4B4C4D4 Means

R. I. T Mechanical Engineering Functions vs. Means Function AFunction BFunction CFunction D A1B1C1D1 A2B2C2D2 A3B3C3D3 A4B4C4D4

R. I. T Mechanical Engineering Functions vs. Means Function AFunction BFunction CFunction D A1B1C1D1 A2B2C2D2 A3B3C3D3 A4B4C4D4

R. I. T Mechanical Engineering Functions vs. Means Function AFunction BFunction CFunction D A1B1C1D1 A2B2C2D2 A3B3C3D3 A4B4C4D4

R. I. T Mechanical Engineering Generate Several Complete Designs Use this method to generate complete, complex systems. Eventually, you will evaluate systems against one another Practically speaking, some solutions work better together than others (solution set not as big as you think)

R. I. T Mechanical Engineering Team Activity Within your team, review the morphological chart and develop concepts for 3-4 different complete systems for one of your projects. For each one, consider the following: What is the relative difficulty level (i.e., rank all your systems in order of difficulty)? What staffing would be required to complete this design?

R. I. T Mechanical Engineering Session Objectives Motivation Morphological Chart Pugh Concept Selection Work time

R. I. T Mechanical Engineering Pugh Concept Selection Developed by Stuart Pugh Insight from past MSD guide (VP of Engineering at a global medical device company): Every time his company had a failed product, the post- mortem showed that the failure originated in concept selection.

R. I. T Mechanical Engineering Sample Selection Matrix Concepts ABCDEG (Reference) Selection Criterion #1 Selection Criterion #2 D etc… A T U M Sum + 's Sum 0's Sum -'s Rank Continue? Each concept you generated (support with figures) Reference Concept Score each other idea as being better than (+), worse than (-), or the same as (0) the reference concept for each criterion

R. I. T Mechanical Engineering Guidelines Compare concepts that are developed in similar detail Select objective criteria (can use needs and specs as a starting point to develop these) An existing solution/benchmark is a good starting Datum Compare each concept to the Datum for each critera Tally +’s, -‘s, and 0’s

R. I. T Mechanical Engineering But wait, there’s more! Then… If some concepts show significant strengths, eliminate them and re-run the matrix. Change the Datum and rerun the matrix to see if strong concepts are still strong. If a strong concept continues to emerge as strong, make that concept the datum and re-run the matrix. Learn things about your designs Identify opportunities to improve strong designs Resist temptation to go with an early front- runner!

R. I. T Mechanical Engineering Session Objectives Motivation Morphological Chart Pugh Concept Selection Work time

R. I. T Mechanical Engineering Work time Things to consider… Analysis Benchmarking Morphological chart Developing selection criteria Preparing for Week 9 presentation Brief overview of VOC VOE: functional decomposition Metrics, Specifications, HOQ mapping Potential concepts Areas of uncertainty