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

2. 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.

3. 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)
Several methods are listed above that can assist teams in making decisions throughout the project
One (1) method (in bold) will be required to assist in deciding which two (2) of the concepts will be selected to continue with investing up to the Preliminary Design Review

4. Two Stages to Concept Selection
Concept Screening – Screening Matrix
A quick method to down-select ideas
Use to combine various concepts or parts
Sometimes good enough for simple projects
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”
These two (2) stages are only part of a design decision construct, and specifically discussed here because of the unbiased structure to categorize and weigh design aspects and screen/score various design concepts.
Both will be used for the executive summary, Preliminary Design Review (PDR), and Critical Design Review (CDR).

5. Concept Screening Matrix
Rank each design against every criteria.
Rank better, worse, or same as reference.
Tally scores to find best designs.
Combine and improve to get top several concepts.
Continue with next step.
As a team develop design Success Criteria (6 minimum are required)
Starting with a “reference” design (sample-AEV), rank better (+), worse (-), or same (0) as reference
Tally scores, combine design concept components (not mandatory), and rescore (shown on next slide)

6. Concept Screening Matrix Example
Reference Design
Night Hawk 3 +
Aerodynamics
Cost
Center of Gravity (Balance)
Sum of +’s
Sum of 0’s
Sum of –’s
Net Score - 1
This is an example of the screening matrix comparing the sample AEV to 1 1

7. Concept Screening Success Criteria Balanced - Minimal blockage +
Reference
Design A
Design B
Design C
Design D
Design E
Design F
Balanced -
Minimal blockage +
Center-of-gravity location
Maintenance
Durability
Cost
Environmental
Sum +’s
Sum 0’s
Sum –’s 7 2 5 1 4 3
Net Score -1 -2
Continue ?
Combine
Yes No
Revise
Four (4) original concepts were screened, compared to the reference design. The reference design should have (0’s) for each design Success Criteria
Components of individual designs were combined (Combine) and rescored, and then further revised (Revise)

8. Concept Scoring Define Success Criteria (rows).
Same as before but with perhaps more detail. Add hierarchical breakdown if necessary.
Weigh the importance of each criteria (0 – 100% with column adding to 100%).
Define Reference and, if necessary or desired, newly revised set of design concepts as results of 1st step.
Rate each design for each criteria (0 – 5 with 5 being the best).
Calculate ranking by adding weighted scores.
Select highest ranked design concepts.
Design Scoring provides more detail by weighting each design “Success Criteria” in percentage (total 100%)
A reference is selected (either sample-AEV or new reference)
Using design concepts, or if necessary and desired, newly revised set of design concepts from the screening process, each concept is rated for each criteria (0-5, with 5 being the best)
The weighted rankings are calculated and used to assist in further revising concepts and/or selecting high ranking design concepts
This is an iterative process that can continue throughout the design process and the duration of the project

9. Concept Scoring (Select Final Design Concept)
A Reference
Old Ref & E
Design D
Design F+
Success Criteria
Weight
Rating
Weighted Score
Balanced 5% 3
0.15 4
0.20
Minimal blockage
15%
0.45
0.60
Center-of-gravity location
10% 2
0.30 5
0.50
Maintenance
25%
0.75
Durability
Cost
20%
0.40
Environmental
Total Score
2.75
3.45
3.10
3.05
Continue? No
Develop
The example above shows variation in weights for design Success Criteria, a new selected reference (A Reference) and scoring for three (3) concepts: a combination of components for two (2) concepts (Old Ref and E), an original concept (Design D), and a revised concept (Design F+)

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

11. Classroom Track Testing Procedure
Review the AEV Classroom Track Testing Procedure.pdf in today’s in-lab activities on the EEIC courses website.
Follow today’s Concept Screening and Scoring Guidelines & program provided scenario.
Demonstrate the balance of the AEV by placing the AEV on the desktop stand.
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?
Get an Instructor/TA’s approval prior to running on the test track.
Use the large propellers for the track test
Caution: Before running on the test track, verify that the body of your AEV is PARALLEL to the track. Carefully tighten the attaching screws to assure the alignment does not change.

12. Test Track Safety Procedure
Entrance Gate (Station #2)
North
= Locations of where students should stand
Start Here
North row – outer north track
Next row – inner north track
Next row – inner south track
South row – outer south rack
East
Back of classroom

13. 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 10B with more details of the PDR outlined in Lab 8

14. Questions?