1.1 ENGINEERING DESIGN
DEEP DIVE VIDEOS
View the entire “Deep Dive” episode by using the following links.
Please answer the following questions based on the videos and your understanding of the Engineering Design Process (EDP).
1. What was the problem the engineers at IDEO were asked to solve?
Completely redesign a shopping cart in 5 days.
2. Name two constraints that they had to deal with.
Drifting process and time constraints.
3. What were two of the major concerns/issues the teams discovered from their research?
22,000 child injuries from shopping carts and wind.
4. IDEO uses several methods, processes and ideas to generate alternative solutions. What two principles or approaches appealed to you the most? Why?
Designing various prototypes focused on different aspects and combining all the ideas in the end. All aspects are covered in this way.
Building on the ideas on others. Improvement is made upon the ideas.
5. How were the possible solutions prototyped and tested?
Prototypes were built and the whole of the IDEO team came together to test its effectiveness through demonstrations.
6. Was there a redesign step in the IDEO project? What was the final outcome?
Yes, the combination of all the prototypes was the redesign step. The final outcome covered all the considered aspects.
1.2 Assignment of roles
Project Manager : Yasha Lai
Drivetrain Engineer : Matthea Koh
Wheel and Chassis Engineer : Koh Guo Feng
1.3 Brainstorming
Engineering Goals
- Develop a MouseTrap Car with the following specifications:
(a) Uses only the MouseTrap provided as the only energy source
(b) Has a maximum length of 30 cm, with of 10 cm, and a height of 10 cm
(c) Can travel a minimum distance of 5 meters carrying an egg (the egg will be provided by the teacher)
(d) All time-lines have to be adhered
LIST ANY KEY TERMS OR ISSUES THAT CAME UP DURING BRAINSTORMING. This does not have to be neat or even organized. It gives you a way to keep track of any idea you may have had. Include separate notes, google sketches, etc. if you have them. (Attach separate sheets if needed)
1st Idea
 |
2nd Idea
 |
3rd Idea
   |
5.7 Bibliography
1.4 Decision Making Matrix
Idea 1
|
Idea 2
|
Idea 3
| |||||||
Criteria
|
Normal
Priority
Value
|
Rank
(1-5)
|
R x N
|
Normal Priority Value
|
Rank
(1-5)
|
R x N
|
Normal Priority Value
|
Rank
(1-5)
|
R x N
|
Weight
|
0.157
(3.s.f)
|
5
|
0.785
|
0.157
(3.s.f)
|
5
|
0.785
|
0.157
(3.s.f)
|
5
|
0.785
|
Size
|
0.157
(3.s.f)
|
4
|
0.628
|
0.157
(3.s.f)
|
5
|
0.785
|
0.157
(3.s.f)
|
5
|
0.785
|
Appearance
|
0
|
4
|
0
|
0
|
4
|
0
|
0
|
2
|
0
|
Time to produce
|
0.148
(3.s.f)
|
3
|
0.444
|
0.148
(3.s.f)
|
3
|
0.444
|
0.148
(3.s.f)
|
3
|
0.444
|
Cost to produce
|
0.120
(3.s.f)
|
4
|
0.480
|
0.120
(3.s.f)
|
4
|
0.480
|
0.120
(3.s.f)
|
5
|
0.6
|
Ease of use
|
0.139
(3.s.f.)
|
2
|
0.278
|
0.139
(3.s.f.)
|
5
|
0.695
|
0.139
(3.s.f.)
|
2
|
0.278
|
Availability of materials
|
0.0833
(3.s.f)
|
5
|
0.417
|
0.0833
(3.s.f)
|
5
|
0.417
|
0.0833
(3.s.f)
|
5
|
0.4165
|
Environmental impact
|
0.0648
(3.s.f)
|
4
|
0.259
|
0.0648
(3.s.f)
|
4
|
0.259
|
0.0648
(3.s.f)
|
5
|
0.324
|
Safety
|
0.130
(3.s.f)
|
5
|
0.650
|
0.130
(3.s.f)
|
5
|
0.650
|
0.130
(3.s.f)
|
5
|
0.650
|
Total
|
3.941
|
4.515
|
4.2825
|
1.5 Design rationale and notes
Wheels
Rubber toy wheels which have increased grip and are stable. Other alternatives include using discs or cutouts of cardboard, which do not have as much grip and are not as stable.
Lever arm
We made it out of two chopsticks attached together so that it would be longer so that the car would be able to travel further.
Ice cream sticks are lightweight - lighter than other materials like cardboard - while still being able to maintain its strength.
Chassis Shape
We made it large enough to hold the mousetrap and the egg carton and made it rectangular so it would be easier to attach the wheels to.
Location of Mousetrap
We put it at the back so that there would be space to attach the egg carton.
Axles
Pencils are used for the Axles. Due to it’s hexagonal shape, it is easier to attach string onto it, whereas using a round stick would cause string to unwind itself.
String type and attachment
We used nylon string as it is stronger and will not break so easily, compared to other strings like cotton.
1.6 Materials used
Material
|
Where is it used?
|
Reason?
|
Ice cream sticks (thick ones)
|
Chassis
|
To make the body as it is lightweight
|
Rubber toy tyres
|
Wheels
|
They have increased grip and are stable
|
Pencil
|
Axle
|
Hexagonal, thus easier to attach things onto it
|
Mousetrap
|
On the chassis
|
To power the car
|
Egg carton
|
On the chassis
|
To hold the egg
|
Chopsticks
|
On the mousetrap
|
To use to wind up the car
|
Nylon string
|
Attached to the chopsticks and mousetrap
|
To use to wind up the car
|
Hot glue gun/duct tape/tape/bluetack/other adhesives
|
Where applicable
|
To hold the car and pieces on it together
|
1.7 Preliminary Sketch (Using Google Sketchup)
 |
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