Team Human Powered Vehicle Team Human Powered Vehicle This document is controlled information and is only reproducible with permission of Team HPV 1 Team HPV: A Quick Review Prepared By: Tyler Jandreau, Taylor Brown, Jamie Huffman, Joey Stine, Kevin Villa, Matt Strand, Kyle Chapman, Jimmy Woodard, Adam Cooper
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Team Human Powered VehicleTeam Human Powered Vehicle
This document is controlled information and is only reproducible with permission of Team HPV 1
Team HPV: A Quick Review
Prepared By:
Tyler Jandreau, Taylor Brown, Jamie Huffman, Joey Stine, Kevin Villa, Matt Strand, Kyle Chapman, Jimmy Woodard,
Adam Cooper
Team Human Powered VehicleTeam Human Powered Vehicle
This document is controlled information and is only reproducible with permission of
Team HPV2
Objectives
“ Team HPV will design and build an aerodynamically and mechanically efficient vehicle that uses pure human power to achieve a top speed of at
least 61.5 mph.”
Top Level Objectives•Design and build a Human Powered Vehicle•Perform research to determine appropriate HPV design techniques•Document equations and techniques to use when designing the HPV•Perform necessary logical hand calculations to ensure subsequent design steps are accurate and valid• Use high-tech engineering techniques to validate results
Team Human Powered VehicleTeam Human Powered Vehicle
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Evolution of Requirements
To determine the validity of the requirements, we must first understand the needs of the product
• What will happen in a crash?
• How will this be built?
• How will this go the correct speed?
• Where will we test this vehicle?
• What is the time constraint?
• How can we ensure the efficiency of this vehicle?
Team Human Powered VehicleTeam Human Powered Vehicle
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Functional Requirements
To determine the success or failure of the HPV project, it is necessary to determine what the HPV has to actually do:
• HPV has to be completed before Senior Showcase, 2009
• HPV has to be rideable
• HPV has to have basic rider safety features
• HPV must be light enough for one rider to propel
• HPV shell must be puncture resistant and resist a specific point load
• HPV drive train must not have a mechanical loss of more than 5% of total input
Team Human Powered VehicleTeam Human Powered Vehicle
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Team Goals
The HPV team’s goals include:
Team HPV will assemble and build a vehicle to compete in the land speed challenge
Team HPV will perform all necessary calculations for success by hand
Computer tools will be used to verify previously completed hand-calculations
Success will be met by meeting ~80% of requirements
Team Human Powered VehicleTeam Human Powered Vehicle
This document is controlled information and is only reproducible with permission of Team HPV 6
Calculations
δ = Fa2(3L - 4a)/6EI
The equations to the left were used to perform basic feasibility of the HPV to determine if the human body can break the 61.5 mph barrier
The equations to the left were used in the static analysis method for the joints.
The equation to the right was used for analysis on the frame. It is the equation for deflection of a beam with two free ends and a force in the middle. Also, standard deflection was used with one ridged end.
δ = FL3/3EI
wright.nasa.gov/airplane/drageq.html
Team Human Powered VehicleTeam Human Powered Vehicle
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Drivetrain Calculations
Feasibility calculations for drivetrain system were also preformed, showing HPV team that a minimum loss of power can be achieved with proper engineering:
27 inch wheel at 80 mph = ~ 1000 RPMAssume pedaling cadence of 100 RPM
Drivetrain must be able to meet or exceed 10:1 Ratio. Most ideally, 11:1
Calculations and analysis of CVT transmission showed that 11:1 is nearly impossible.
To obtain 11:1, manual production of a CVT must be facilitated, which exceeds groups ability in machine shop.
Hybrid drive train system developed, using half belt, half chain mechanisms for power transfer
Team Human Powered Vehicle
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of Team HPV8
700x23mm Series Wheels
Dia (in) Md-Drv Ratio Crank Pulley 3.5001.750 Unit Conversion Mid Drive Pulley 2.000 12.781 # of Teeth Ratio Overall Ratio Speed (mph)
Chain Ring 53.000 Cassette 1 34.000 1.559 2.728 21.344 10.672<- Min Start speed
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of Team HPV17
Loss System % Total Power Loss
Aerodynamic Drag 85-90%
Rolling Resistance 5-10%
Drivetrain Friction Loss ~1-2%
Wheel Rotation Power ~1%
Miscellaneous Loss
Power to Overcome Gravity (Hill Application)
Varies Greatly Depending on % Grade of Hill
Power Loss for HPV by Percentage.
Shell Considerations
Team Human Powered VehicleTeam Human Powered Vehicle
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Feasibility Calculations
There were a few significant advancements made over the summer:
• A document was authored explaining the scope, feasibility of the project and the role of team members
• Requests for funding were authored and include 11 different companies
• A Pro|E assembly of Jimmy’s exact dimensions was created for ease of ergonomic design of the frame
• A few members practiced programming in MATLAB, while others have experience in CAM, a MATLAB-like, NASA proprietary software chosen for the ease at which users can add functions
Team Human Powered Vehicle
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of Team HPV19
•This shows relation between frontal area, Cd, and power required to travel 61.5mph.
ShellFeasability
Team Human Powered Vehicle
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•Power feasibility calculations.•Shows how many watts for how long and energy associated with wattage (log scale).
Power Feasibility
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•Impulse from the high watts has little effect on overall change in velocity while long, slow burns have a significant change in velocity. This also shows that if vehicle is lighter, it will have greater change in velocity.
Power Feasibility
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of Team HPV22
•Shows Kinetic energy associated with different weights and speeds•Will be used for braking distance calculations
Braking Feasability
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Current Sponsors
At this time, our sponsors are as follow:
Team Human Powered Vehicle
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Current Budget
Total Budget = - $62
Team Human Powered Vehicle
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of Team HPV25
Timeline
March April May June July Aug Sept Oct Nov Dec Jan Feb March April MayJimmy Conditioning Fundraising
Assemble Sponsorship Package
Brainstorm Potential Businesses
FrameDesign Re-Design
Pro|Engineer Determine Materials Ansys
Manufacture Shell
Design
Pro|Engineer Determine Materials CFD
Manufacture Drivetrain
Design
Manufacture Build Final HPV Test Present Final Results