Miguel's Bike

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Hello reader! This is my action project for Design & Engineering unit 2. This unit I learned about the design process, gears, circles, ellipses, the ethics of design, gear ratios, and much more. This unit we went on a lot of great FE's but the FE to Dyson was really great in my opinion because we got to work WITH design not just have them talk to us then us doing nothing with it. Something I am very proud of this unit is my interview because I put a lot of work in to it. For this project I was given a persona to design a bike for based off the situation the person is in. The purpose of this project is to use all the information we have learned this unit on a real world problem being solved by others around the world but in our own GCE kind of way.


Persona:

Meet Miquel

Location: Sitges, Spain

Age: 12

Distance from school: 1.5 miles

SITUATION

Sitges is a small coastal town on the water, but it’s also full of tourists - meaning Miguel has to worry about vandalism when they lock their bike up outside, or bumping into people with large bags on the narrow cobblestone streets. Also Miguel lives on the third floor meaning they have to carry their bike up and down the stairs twice a day.

During my interview, the cyclist I interviewed talked about how falling off their bike caused them a serious injury so I designed my bike to only have one metal pole on the frame in order to prevent groin injury if a fall occurs. The bike's main feature is the music box attached to the front wheel. This allows Miguel to alert pedestrians when he's biking to and from school. The bike also folds so Miguel can carry his bike up the stairs easier.




wheel/gear math:
R = 11 inches
D = 22 inches
C = 69.11 inches
Number of rotations for Miguel to get to school: 63360 / 69.11 x 1.5 = 1,375.098 rotations
gear ratio: 2:1

Speed calculations:
1.5 miles at 6 MPH it takes him 15 minutes to get to school
given the context, I suspect Miguel’s MPH is 6, in MPS that equals 2.6 MPS

Kinetic energy calculations:

M: 65kg (bike: 25kg Miguel: 40kg)

P: 65 x 2.6 = 169 kg/mps

KE: ½ x 65 x 2.6^2 = 219.7J

3D model:


3D model scaled to the real bike:

Model radius: 1.25 x 2 = 2.5 = D

22/2.5 = 8.8

Scale = 1:8.8



Digital model:

Overall this was a very labor intensive AP. Some challenges I encountered with this AP was creating something not seen before. I had looked at the design beyond the engineering mindset. After deciding on a final design for the frame. We compromised and combined our two designs. I learned that when you hit a plateau in your design process, it is best to look at the project from a different angle, one a designer may not usually see. Empathy came into play here a lot, just like the previous AP.

Citations: 

RM "Miguel's Musical Bike" 11/10/22 
FK " Miguel's Bike Geogebra" 11/10/22 
FK,RM "Model" 11/10/22 

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