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A New Way to Multi-taskGet your exercise in while you work!
A Bike-Powered
Athena Workstation
1.102 Group D Piotr FidkowskiSebastian Figari
Sara JohnKendra Johnson
Julia KiberdTina Lai
Devon McCorkle
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Why?
To create a feasible, interactive, and interesting energy harvesting system
To inform the public of renewable energy possibilities and to raise energy awareness
Something that meets and need an that people can fit into their everyday lives
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What?
Bicycle-powered Laptop Retro-fitted
Recumbent Exercise Bike
Generator/Motor Data Acquisition
Device Laptop
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How?
Convert the rotational energy of the exercise bike into electrical energy through a generator or motor
Use that power to run a laptop that will be secured to an adjustable table, fitted to the bicycle
Gearing between the flywheels and the generator to ramp up the RPM
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Power Production
Average Person produces 60-100W @ continuous 63rpm
Pedal Power 50% efficiencyLaptop uses 19.5V adapter, 130W max
chargerLaptop consumes on order of 30W
average
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Specifications: Mechanical Components
52 tooth gear for pedal shaft
22 tooth freewheel 6 inch camshaft pulley for
flywheel shaft Retro-fitted tensioner for
chain 2.5 inch camshaft pulley
for generator Bike chain Adjustable table IS&T security device
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Specifications: Electrical Components
10 amp DC generator 12 volt lead acid battery Xantrex charge controller Brushless 12 volts DC fan Resistor Power monitor Dell Latitude D820
Laptop Power cord
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Specifications: Fabricated Components
.5 inch plywood (15” by 15”) base for electrical components
3/4” mfb for electrical housing
Plexiglass for display Acrylic boxes for housing 1/4” aluminum for
generator plate 3/16” metal disc for gear
mounting
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Specifications: Retro-fitting
Cut down and bolt on front gear
Remove belt drive system and magnetic resistance mechanism
Modify belt pulley to attach 22 freewheel to axis
Attach camshaft pulley to drive generator (bolt to flywheel)
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Specifications: Power Generation
Initial Capacitor Buck converter
95% efficiency Feedback on current to
maintain charging rate PWM sets duty cycle,
which sets charging rate, which sets resistance to biker
PWM adjustable Second Capacitor 12V Lead-Acid battery
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Modifications To Original Design
Mechanical: Mounting generator Pulleys instead of gears Welded table onto bike Plexiglass cutout in
casing Chain tensioner
Electrical: LabJack Circuitry Housing
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Assembly
1. Remove bike housing, resistance mechanism, drive belt system
2. Attach 53 tooth gear to pedal shaft by removing plastic belt gear, machining aluminum plate, and bolting gear to plate
3. Use lathe to modify flywheel drive pulley to receive threaded freewheel
4. Drill/tap four holes in flywheel to attach 6” camshaft pulley
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Assembly (Continued)
5. Attach flywheel with attached components to bicycle and thread camshaft belt and bicycle chain over axis
6. Fabricate generator mounting plate and bolt to bicycle frame
7. Fasten 2.5” camshaft pulley to generator8. Adjust horizontal location of flywheel axis to
obtain proper belt tension9. Modify scrap derailer to tension chain, attach
by bolting to flywheel mount
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Design Process
Brainstorm, research, surveys Initial ideas, broad research, in-field surveys
Calculations and more in depth research Specific parts Analysis of similar projects
Fabrication and adjustments Prototyping and testing merged into fabrication
due to time constraints
Deployment and evaluated public response
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Public Response
LOTS of interest Minor lack of use due to
embarrassment Tim Moore (manager of
Zesiger Center) expressed interest in permanent installation and display
Public education of sustainable energy
(below) Steve, Kendra, Dr. G, and Julia are all really excited about sustainable energy
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Evaluation of Main Project
Larger time span would have been optimal Could make it a two-semester project Lack of time led to hasty production
Clearer instructions, expectations, and a set timeline Order parts earlier; led to too much downtime
Good way to experience the design process Better understanding of sustainability, energy,
and energy storage Great!
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Our Group
(left to right) Sara, Piotr, Julia, Sebastian, Kendra, Tina and Devon
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Evaluation of Class
Fewer electricity labsSplit lab times
Offer Tuesday/Wednesday labsRube Goldberg machine was very helpful
Boosted confidence in our building abilities Better understanding of how parts create a
wholeMore welding Helpful and knowledgeable instructors