Jason Andrews Tyler Burns Maxamillion McMahon Nicolas Reginelli Tyler Schmidt Anna Sementilli Guide:...
-
Upload
gabriella-phelps -
Category
Documents
-
view
215 -
download
1
Transcript of Jason Andrews Tyler Burns Maxamillion McMahon Nicolas Reginelli Tyler Schmidt Anna Sementilli Guide:...
P15418: Better Water Maker
Jason AndrewsTyler Burns
Maxamillion McMahonNicolas Reginelli
Tyler SchmidtAnna Sementilli
Guide: Gerry GaravusoCustomer: B9 Plastics
AgendaProject DescriptionRequirements SummaryConcept and Design SummarySystem ArchitectureCompetitive AdvantageTesting ResultsProject EvaluationRecommendations for future workLessons Learned
Project DescriptionThe goal of this project is to
improve B9 Plastic’s Better Water Maker. The Better Water Maker works by reducing the number of dangerous waterborne microbes via the use of a UV bulb. Two different designs have been tried in the past, with the current version utilizing a hand crank flywheel as a method of mechanical power generation. The major goal is to design the power system so that it generates the required power with less human effort. The current UV treatment process must not be altered.
Requirements SummaryEngineering Requirement
Description Metric Target Value
Marginal Value
ER1 Power Generated
Power (V/A/W)
12/2.5/17
+3/-0
ER2 Training Time Time (minutes)
20 +10
ER3 Installation Time
Time (minutes)
90 +/- 30
ER4 Effort Required
CO2 L/Min .9 -.9
ER5 Number of Installers Required
# People 1 1 or 2
ER6 Unit Life Life of Parts (Yrs)
2 -0.5
ER7 Electrical Protection
Voltage (V), Current (A)
25/3 +0/-3
Concept and Design SummaryBegan with:
PlywoodStepped gear box
Moved to:Custom gear for correct ratioSolid AL plate
Ended with: Static line for pulleySprocket and chain system
Concept and Design SummaryFinal Design:
Ratio of ~15 through the use of sprockets
Turned out to be a little unbalancedGears… Heat, friction, stretch = energy loss
Improvements: In need of a lighter, cheaper redesignLonger base supportsSprocket & chain connected to
pedalsCover for safetyAlternative way to hold yourself upSome adjustability
Concept and Design Con’tAccomplished:
Speed to create powerWorking prototype
Lessons Learned: Design early, allow for
time for redesignsDesign with assembly in
mindModels can be misleading
Missed the mark: Cost more than anticipated Some parts showed
extreme wear characteristics
Safety concerns regarding sprockets
Loud noise the prototype makes while operated isn’t pleasant
System Architecture
Competitive AdvantageDesign chosen due to increased efficiency
with use of leg muscle vs arm muscle
Standing concept allows use of full body weight
Stepping is a more natural motion
Allows for a high gear ratio, reducing total work and lactic acid build up
Testing Results-Power GeneratedMotor Output-18.4V,2.9A,53W
Buck Converter Output- 15V,2.9A,43.5W
Testing Results-Electrical Protection3A fuse failed (as expected) with a 4.5Ω load
at 15V (3.33A)Max voltage is limited to 25V by a capacitor
in the Buck Converter The UPS system also has a 3A fuse and the
components can handle 40V
Testing ResultsHand Crank-max CO2=.85(L/m)
Treadle System- max CO2=1.42(L/m)2.5 steps/second.48 Gal/Min
Ramp up to required SPS
Pump Delay
Pumping Water
Project EvaluationElectrical
Power generated was satisfied with 1 motor generating ~18.4V/2.9A/53W.
Electrical protection put in place to protect circuitry against a 3A surge in current with buck converter regulating voltage to 14.8V.
Battery Management System added to compensate for non-periodic motion of motors and so users will not exert energy for 10 seconds to power on light. System was designed to charge at 500mA @ 15V
and to trickle charge at ~20mA @ 12V.
Project EvaluationMechanical
Treadle system designed to take advantage of leg strength and body weight.
Easier to sustain a constant motion as compared to hand crank. Step rate: 2.53 steps/sec which is at a faster pace than what
was designed for. Add flywheel to keep motion constant and reduce step rate.
Pulley identified as the failure point of the system. Plastic coated steel cable or spring/bungee pedal return
system could be a solution.System could be too complex for people in the third
world to assemble properly
Engineering Requirement
Description Metric Target Value
Marginal Value
Actual Performance Rating
Was the requirement
satisfied?
ER1 Power Generated
Power (V/A/W)
12/2.5/17
+3/-0 Power generated was satisfied by generating ~18.4V/2.9A/53W
Yes
ER2 Training Time Time (minutes)
20 +10 Not formally tested for but observed during Imagine; determined that the training time for a child to use the system is <20 minutes
Yes
ER3 Installation Time
Time (minutes)
90 +/- 30 System could be too complex for people in the third world to assemble properly
No
ER4 Effort Required CO2 L/Min .9 -.9 Step rate: 2.53 steps/sec which is at a faster pace than what was designed for; Hand crank requires less effort
No
ER5 Number of Installers Required
# People 1 1 or 2 Because of the weight of the system and the complexity, more than 1 installer will be required
No
ER6 Unit Life Life of Parts (Yrs)
2 -0.5 Pulley identified as the failure point of the system
No
ER7 Electrical Protection
Voltage (V), Current (A)
25/3 +0/-3 Electrical protection put in place to protect circuitry against a 3A surge in current with buck converter regulating voltage to 14.8V
Yes
Schedule and BudgetBudget: $1,000Actual Spending: $940
Project Plan: We fell behind at times during the year but it came together in the endThings left to do:
Finalize Paper Final Review Final Peer Reviews Update Edge
Recommendations for future work• Weight reduction would be a great way to
improve this design• Experiment with wrapping rope around
the shaft• Add flywheel to help reduce the required
step rate• Simplify amount of parts in product• Include stronger pulley/better pedal
return system• PCB layout for UPS system
Lessons LearnedCommunication: External (customer) and
internal (project team) communication should be more frequent and consistent. Have written agreements for decisions and goals.
Planning: Plans constantly change and evolve. Tasks like testing the system will often take longer than anticipated and may introduce issues that further extend timelines.
Risks: Discover as many risks as you can. Make sure you account for a lot possibilities, from very likely situations to those you’d never expect to occur.
Execution: Teamwork is essential. Share roles and split up work to get things done faster and more efficiently.
Questions?