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ENGS 171 Industrial Ecology Redesigning the Bicycle. Alan Salas, Kevin Dahms , Jess Zarker , Jose Ordonez, Robbie Moss. Recap from last time. Part 2: Redesign. Design Requirements. Seat Mast Tube. FUNCTION: To support the weight of the person. Acts as a column in compression

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engs 171 industrial ecology redesigning the bicycle

ENGS 171Industrial EcologyRedesigning the Bicycle

Alan Salas, Kevin Dahms, Jess Zarker, Jose Ordonez, Robbie Moss

design requirements
Design Requirements

Seat Mast Tube

FUNCTION:

To support the weight of the person. Acts as a column in compression

OBJECTIVES:

Ideally, minimize environmental impact and mass

CONSTRAINTS:

Recyclable

High strength and stiffness

FREE VARIABLES:

Material choice, shape, color

indices
Indices

For minimizing environmental impact (embodied energy and CO2)

Minimizing Embodied Energy

Minimize Hmρ/ E1/2for stiffness

Minimize Hmρ/ σyfor strength

Minimizing CO2

Minimize CO2ρ/ E1/2 for stiffness

Minimize CO2ρ/ σy for strength

material selection
Material Selection

Analysis for seat mast tube (modeled as a column)

material selection1
Material Selection

Lower

embodied

energy!

Low-alloy steel

Bamboo!

material selection2
Material Selection

Low-alloy steel

Lower

CO2

Bamboo!

material selection3
Material Selection

Low-alloy steel

Bamboo!

Lower

density

slide15

Mass vs. Cost

Cheaper

Low-alloy steel

Bamboo, Softwood and Hardwood

slide16

Mass vs. Embodied Energy

Less embodied energy

Low-alloy steel

Bamboo, Softwood and Hardwood

slide17

Cost vs. CO2

Less CO2

Low-alloy steel

Bamboo, Softwood and Hardwood

slide18

Cost vs. Embodied Energy

Less embodied energy

Low-alloy steel

Bamboo, Softwood and Hardwood

slide19

Shape

4.5 mm

29 mm

38 mm

slide20

Shape

  • These specifications are for Iron bamboo, which is the strongest type
  • If it is a more flexible bamboo, use wider and thicker tubing
  • If internal diameter is less than 29 mm, there will be a hoop stress, which we didn’t look into carefully in this analysis.
  • http://www.useful-arts.com/sua/instructions/bamboobikekit/harvest/
use phase analysis
Use Phase Analysis
  • Negligible environmental impact
  • NEXT Bike
    • Maintenance: paint, wheels, lost accessories, oil
    • Once child grows, bike becomes obsolete
use phase analysis cont
Use Phase Analysis (cont.)
  • BamBIKE:
    • Introduce a service program
      • Convert the product into a service
      • Incentive: offer free repairs (only cost is purchasing the parts), offer discounts, etc.
      • Return old bike, obtain new larger bike at a discount

“If your child grows faster than bamboo, we have a solution for you!”

co 2 of materials
CO2 of materials

74% reduction

87%

water audit of redesigned bike
Water-audit of redesigned bike

Why isn’t there a significant change???

economic analysis
Economic Analysis
  • Materials:
    • Low alloy steel
      • 0.89-0.93 USD/kg
      • At 3.68 kg, price is $3.35
    • Bamboo
      • 1.37-2.05 USD/kg
      • At 0.4 kg, price is $0.82
  • BUT, labor is a problem:
    • More labor intensive to assemble BamBIKE, so higher costs are associated
    • This is why it is currently only offered to very specialized, high end consumers
economic analysis1
Economic Analysis
  • CNN article published today about a bamboo bike company located in Zambia:

“Each frame takes between 40 and 60 man hours to make[…]Every piece of bamboo is having different colors, different bend, so every frame is unique."

  • That explains the high costs, and why these “high-end, lightweight bicycles” have “a price tag of around $900” and are “primarily aimed at the international market”.

http://edition.cnn.com/2012/05/31/business/bamboo-bicycles-zambia-zambikes/index.html?hpt=hp_c4

considering aesthetics paint and plastics

Aesthetics are a major feature

refractive quality of paint,

extra features (painted plastic),

logo designs

Considering Aesthetics: Paint and Plastics

  • Aesthetics are also subjective; malleable
  • Don’t outweigh the environmental impacts:
    • Greenhouse gas emissions: VOCs, CO2, NOx, SOx , and PM
    • Health Concerns for workers
  • “Eco-Design”

Water-based paint

Water-based non-toxic wood varnish

logo

conclusions and recommendations
Conclusions and Recommendations

Findings

  • Bamboo is an appropriate substitute for steel
  • Saving 91 MJ per bike means saving energy of

245 bananas per unit!!!

Considerations

  • Industrial infrastructure is currently nonexistent
  • This is the foundation for a sustainable lifestyle
conclusions and recommendations1
Conclusions and Recommendations

There are other important benefits of bamboo that could be further exploited:

“One of nature's fastest growing resources”

“Has great shock absorbing abilities that contribute to a smooth and eco-friendly ride”

http://edition.cnn.com/2012/05/31/business/bamboo-bicycles-zambia-zambikes/index.html?hpt=hp_c4

moving forward
Moving forward…

Hemp

Wood

Wood

and ideally…

DIAMOND!