1 / 25

Team Human Powered Vehicle

Team Human Powered Vehicle. 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. Objectives. Team Human Powered Vehicle.

mia-lang
Download Presentation

Team Human Powered Vehicle

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Team Human Powered Vehicle 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 This document is controlled information and is only reproducible with permission of Team HPV

  2. Objectives Team Human Powered Vehicle “ 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 This document is controlled information and is only reproducible with permission of Team HPV

  3. Evolution of Requirements Team Human Powered Vehicle • 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? This document is controlled information and is only reproducible with permission of Team HPV

  4. Functional Requirements Team Human Powered Vehicle • 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 This document is controlled information and is only reproducible with permission of Team HPV

  5. Team Goals Team Human Powered Vehicle • 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 This document is controlled information and is only reproducible with permission of Team HPV

  6. Calculations Team Human Powered Vehicle 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 wright.nasa.gov/airplane/drageq.html The equations to the left were used in the static analysis method for the joints. δ = Fa2(3L - 4a)/6EI 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 This document is controlled information and is only reproducible with permission of Team HPV

  7. Drivetrain Calculations Team Human Powered Vehicle 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 RPM Assume 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 This document is controlled information and is only reproducible with permission of Team HPV

  8. DrivetrainCalculations Team Human Powered Vehicle • Speed calculations using mid-drive and possible cassette option. 53 Tooth Chain Ring 2" Mid Drive Pulley Belt Belt Bike Chain Bike Chain INPUT 3" Pulley w/ Cranks INPUT 3" Pulley w/ Cranks 700x23 Race Wheel 700x23 Race Wheel Cassette 34-21-17-15-13-11-9T This document is controlled information and is only reproducable with permission of Team HPV

  9. DrivetrainCalculations Team Human Powered Vehicle • Validity testing using standard road bike to ensure accuracy of calculations. Tests performed on Jimmy’s road bike. This document is controlled information and is only reproducible with permission of Team HPV

  10. First Mock Up Team Human Powered Vehicle • Mock up with 53 tooth chain ring and standard bike cassette/derailleurand belt driven pulleys. Picture taken on 9/1/2008 in Jimmy’s Garage. This document is controlled information and is only reproducible with permission of Team HPV

  11. First Mock Up Team Human Powered Vehicle • Hybrid belt and chain drive system to minimize losses. Picture taken on 9/1/2008 in Jimmy’s Garage. This document is controlled information and is only reproducible with permission of Team HPV

  12. First Mock Up Team Human Powered Vehicle • Hybrid belt and chain drive system to minimize losses. Picture taken on 9/1/2008 in Jimmy’s Garage. This document is controlled information and is only reproducible with permission of Team HPV

  13. Video of First Mock Up This document is controlled information and is only reproducable with permission of Team HPV

  14. Frame Calculations Team Human Powered Vehicle New calculations have shown that our previous approach to carbon fiber/nomex frame was a worthy idea, but not to be expanded upon. Difficulty in manufacturing yielded mixed feelings from within the group. Torsional rigidity was also shown to be compromised through quick calculations using the following formula: << Wikipedia It can be shown that the parallel axis theorem in our case yields results that are substantially smaller than that of the torsion of a thin walled rod This document is controlled information and is only reproducible with permission of Team HPV

  15. Frame Design • Current aluminum frame design undergoing stress analysis. This document is controlled information and is only reproducable with permission of Team HPV

  16. ShellDesigns CdAof 2.4 CdAof 0.25 CdAof 0.6 http://www.adventuresofgreg.com/HPVlog/VehicleDrags.html This document is controlled information and is only reproducable with permission of Team HPV

  17. Shell Considerations Power Loss for HPV by Percentage. This document is controlled information and is only reproducable with permission of Team HPV

  18. Feasibility Calculations Team Human Powered Vehicle • 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 This document is controlled information and is only reproducible with permission of Team HPV

  19. ShellFeasability • This shows relation between frontal area, Cd, and power required to travel 61.5mph. This document is controlled information and is only reproducable with permission of Team HPV

  20. Power Feasibility • Power feasibility calculations. • Shows how many watts for how long and energy associated with wattage (log scale). This document is controlled information and is only reproducable with permission of Team HPV

  21. Power Feasibility • 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. This document is controlled information and is only reproducable with permission of Team HPV

  22. Braking Feasability • Shows Kinetic energy associated with different weights and speeds • Will be used for braking distance calculations This document is controlled information and is only reproducable with permission of Team HPV

  23. Current Sponsors At this time, our sponsors are as follow: This document is controlled information and is only reproducable with permission of Team HPV

  24. Current Budget Total Budget = - $62 This document is controlled information and is only reproducable with permission of Team HPV

  25. Timeline This document is controlled information and is only reproducable with permission of Team HPV

More Related