September 8th 201/301

I missed much of today's class due to a morning meeting at Greater Lawrence Technical Vocational School discussing the STEAMStudio project ( http://www.steamstudio.org/ ). It was one of the best meetings I have been to in a long time, as everyone had something to contribute to the lively discussion.
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Students were busy when I came in in three groups:

      (1) Researching venues for promoting GreenEngineering

      (2) Measuring power output of bicycle-powered generator, and power draw of speakers.

    Below: 2 Farad audio capacitor ( http://www.crutchfield.com/S-zeF6WFMgzNP/learn/learningcenter/car/capacitors/faq.html )that stores up the power generated by pedaling and releases it to power a 12V automotive audio amplifer:

   From http://innovativecities.weebly.com/pedal-powered-speakers.html :

THE GENERATOR:

Our generator is a McMaster Model # 6331k13
It was rated at 3,456rpm to produce 12 VDC at 5.02 Amps
With a wheel diameter of 1/4", I calculated the radius to be 1/8"
However, we are in tangent with the resistance wheel which has a radius of 3/4"
The radius of the bike wheel is about 25".
The ratio between the bike and generator would therefore be 1/2"   :  25"
After cross multiplication this would create a 1:50 ratio
Therefore, in order to achieve a max generation at 3,456 rpm, one must pedal at 3456/33 or 69.2 rpm.

This charges a 2 Farad Audio Capacitor:

I purchased a basic 2 Farad Audio Capacitor. The Farad is a unit of how much energy it can hold. Anything above 2 should be fine.

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       (3) Working on solar-powered LED system.

Adam-

Do a weekly written reflection  for Greenengineering-- list the things you did, the things you plan to do, and issues you have-- I will respond to what you write.

This will be done using Schoology( https://app.schoology.com/school/105120621 ).

As you work, think of the engineering design process-

• What does the end user/customer need/want?( Empathy)
• https://www.ideo.org/approach
• What already exists/is pout there? ( Precedents)
• See Prezi https://prezi.com/u1d_akplq1o0/precedent-study/
• Design a prototype

Final stage will be marketing your product/creation.

See NuVu Presentation Format: http://www.engineeringk12mass.org/nu-vu-presentation-format.html

MIT Sloan School folks may be available as marketing consultants.

With seniors, discussed revamping the websites. Tharun will lead revamping the Weebly site, consolidating the various files on the existing site. Blog posts will be done on a Blogger site, which will be linked to the Weebly site.  The various abandoned sites will then be deleted.