Design Concepts and Selection Design Project Management Rochester

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 R. I. T Function A Function B Function C Function D A 1 B 1 C 1 D 1 A 2 B 2 C 2 D 2 A 3 B 3 C 3 D 3 A 4 B 4 C 4 D 4 Mechanical Engineering

Functions vs. Means Function A Function B Function C Function D A 1 B 1 C 1 D 1 A 2 B 2 C 2 D 2 A 3 B 3 C 3 D 3 A 4 B 4 C 4 D 4 B 1 C 2 D 3 A 1 R. I. T Mechanical Engineering

Functions vs. Means Function A Function B Function C Function D A 1 B 1 C 1 D 1 A 2 B 2 C 2 D 2 A 3 B 3 C 3 D 3 A 4 B 4 C 4 D 4 B 3 C 2 D 3 A 4 R. I. T Mechanical Engineering

Functions vs. Means Function A Function B Function C Function D A 1 B 1 C 1 D 1 A 2 B 2 C 2 D 2 A 3 B 3 C 3 D 3 A 4 B 4 C 4 D 4 B 2 C 1 D 4 A 2 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) B 1 A 1 R. I. T C 2 D 3 B 3 A 4 C 2 D 3 B 2 C 1 D 4 A 2 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 postmortem showed that the failure originated in concept selection. R. I. T Mechanical Engineering

Sample Selection Matrix Each concept you generated (support with figures) Reference Concepts A Selection Criterion #1 Selection Criterion #2 etc… B Score each other idea as being better than (+), worse than (-), or the same as (0) the reference concept for each criterion C D (Reference) E G D A T U M Sum + 's Sum 0's Sum -'s Rank Continue? 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 frontrunner! 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 • • • R. I. T Brief overview of VOC VOE: functional decomposition Metrics, Specifications, HOQ mapping Potential concepts Areas of uncertainty Mechanical Engineering