Advanced Energy Vehicle AEV Lab 03 AEV Concept

Advanced Energy Vehicle (AEV) Lab 03: AEV Concept Screening and Scoring

Learning Objectives § Become familiar with techniques for design decision making § Become familiar with a structured method to screen and score design concepts § Observe a sample AEV operation § Using the sample AEV as a reference, practice concept screening and scoring methods with AEV design concepts.

Types of Decision Methods § External Decision – Customer, client, end user § Product champion – influential team member § Intuition – gut feel § Multi-voting – popular demand § Pros and cons – evaluate strengths/weaknesses § Prototype and test – trial and error § Decision matrices – selection criteria (weigh against prioritized requirements)

Two Stages to Concept Selection 1. • • • Concept Screening – Screening Matrix A quick method to down-select ideas Use to combine various concepts or parts Sometimes good enough for simple projects 2. • • • Concept Selection – Scoring Matrix Provides better resolution than screening May have better definition of concepts at this point May want to refine or create hierarchy of “Selection Criteria”

Concept Screening Matrix 1. Rank each design against every criteria. 2. Rank better, worse, or same as reference. 3. Tally scores to find best designs. 4. Combine and improve to get top several concepts. 5. Continue with next step.

Night Hawk Reference Design Concept Screening Matrix Example Aerodynamics 0 + - 0 0 Center of Gravity (Balance) 0 1 Sum of +’s 3 1 Sum of 0’s 0 1 Sum of –’s 0 0 Net Score 0 Cost

Concept Screening Reference Design A Design B Design C Design D Design E Design F Balanced 0 0 0 - - Minimal blockage 0 0 - - 0 + 0 Center-of-gravity location 0 0 0 + + 0 + Maintenance 0 0 - 0 0 Durability 0 0 0 + 0 Cost 0 + - - 0 Environmental 0 + + 0 0 Sum +’s Sum 0’s Sum –’s 0 7 0 2 5 0 1 4 2 1 3 3 2 4 1 2 3 2 1 5 1 Net Score 0 2 -1 -2 1 0 0 Continue ? Combine Yes No No Yes Combine Revise Success Criteria

Concept Scoring 1. Define Success Criteria (rows). • Same as before but with perhaps more detail. Add hierarchical breakdown if necessary. 2. Weigh the importance of each criteria (0 – 100% with column adding to 100%). 3. Define Reference and, if necessary or desired, newly revised set of design concepts as results of 1 st step. 4. Rate each design for each criteria (0 – 5 with 5 being the best). 5. Calculate ranking by adding weighted scores. 6. Select highest ranked design concepts.

Concept Scoring (Select Final Design Concept) A Reference Old Ref & E Design D Design F+ Weight Rating Weighted Score Balanced 5% 3 0. 15 4 0. 20 Minimal blockage 15% 3 0. 45 4 0. 60 3 0. 45 10% 2 0. 20 3 0. 30 5 0. 50 Maintenance 25% 3 0. 75 2 0. 50 3 0. 75 Durability 15% 2 0. 30 5 0. 75 4 0. 60 3 0. 45 Cost 20% 3 0. 60 2 0. 40 Environmental 10% 3 0. 30 Success Criteria Center-of-gravity location Total Score Continue? 2. 75 No 3. 45 Develop 3. 10 No 3. 05 No

Making the Sample AEV § Build the Sample AEV as shown in the 3 D PDF (in Lab 1). MAKE SURE THE ARDUINO DOES NOT TOUCH THE METAL BRACKETS!!!!!

Classroom Track Testing Procedure 1. Review the AEV Classroom Track Testing Procedure. pdf in today’s inlab activities on the EEIC courses website. 2. Follow today’s Concept Screening and Scoring Guidelines & program provided scenario. 3. Demonstrate the balance of the AEV by placing the AEV on the desktop stand. 4. Run the AEV statically to ensure the code is working the way the team intended. • Are the propellers spinning the correct way? • Is the AEV running the correct length of time? 5. Get an Instructor/TA’s approval prior to running on the test track.

Test Track Safety Procedure Entrance Gate (Station #2) Start Here East Back of classroom North = Locations of where students should stand

Preliminary Design Review (PDR) § The PDR demonstrates that the preliminary design meets all system requirements with acceptable risk and within the cost and schedule constraints and establishes the basis for proceeding with detailed design. • These first eight labs will help build a foundation in creating an energy efficient vehicle that will meet all the criteria stated in the Mission Concept Review (MCR) • PDR is due at the beginning of Lab 10 B with more details of the PDR outlined in Lab 8

Questions?