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
-
0
-
-
Minimal blockage
0
0
-
-
0
+
0
Center-of-gravity location
0
0
0
+
+
0
+
Maintenance
0
0
0
0
-
0
0
Durability
0
0
0
0
0
+
0
Cost
0
+
-
-
0
-
0
Environmental
0
+
+
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 1st 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
Rating
Weighted
Score
Rating
Weighted
Score
Rating
Weighted
Score
Balanced
5%
3
0.15
3
0.15
4
0.20
4
0.20
Minimal blockage
15%
3
0.45
4
0.60
4
0.60
3
0.45
10%
2
0.20
3
0.30
5
0.50
5
0.50
Maintenance
25%
3
0.75
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
3
0.60
2
0.40
2
0.40
Environmental
10%
3
0.30
3
0.30
3
0.30
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 3D 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 in-lab
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 10B with more details of the
PDR outlined in Lab 8
Questions?