1 / 23

ENGR 1110: Lego Car Project Final Design Presentation

March 20, 2012. ENGR-1110 Team 12-A. 2. Overview. IntroductionBasic conceptDriving strategyMechanical sub-systemElectronic sub-systemMaterials and costReliability and safetyCompetition results and analysisConclusion. March 20, 2012. ENGR-1110 Team 12-A. 3. Introduction. Drive a LEGO car around an oval track in the shortest net timeConsider time penalties and bonusesConsider various trade-offs.

roland
Télécharger la présentation

ENGR 1110: Lego Car Project Final Design Presentation

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. March 20, 2012 ENGR-1110 Team 12-A 1 ENGR 1110: Lego Car Project Final Design Presentation Section 12; Team A John Langdon Clint Patterson Joseph Berrios Mustafa Ali Tim Aldridge JohnJohn

    2. March 20, 2012 ENGR-1110 Team 12-A 2 Overview Introduction Basic concept Driving strategy Mechanical sub-system Electronic sub-system Materials and cost Reliability and safety Competition results and analysis Conclusion JohnJohn

    3. March 20, 2012 ENGR-1110 Team 12-A 3 Introduction Drive a LEGO car around an oval track in the shortest net time Consider time penalties and bonuses Consider various trade-offs The ENGR-1110 course involved the design and development of a LEGO car that can complete an oval track in the shortest amount of time. As per specifications, however, we cannot use a battery to operate the DC motors, and have to rely on a computer soundcards analog output. This project involves the design and development of not only a robust car, but reliable driving software and circuitry, too. Creating an incredibly fast car, however, is not a difficult task. The real secret behind this project is taking a close look at the specifications that include time penalties and bonuses to determine the best driving strategy. As with most engineering projects, we had to consider performance, reliability and costs. At each design stage, we considered factors such as: performance vs. reliability Performance vs. Costs And Reliability vs. Costs In order to develop the most cost-effective car.The ENGR-1110 course involved the design and development of a LEGO car that can complete an oval track in the shortest amount of time. As per specifications, however, we cannot use a battery to operate the DC motors, and have to rely on a computer soundcards analog output. This project involves the design and development of not only a robust car, but reliable driving software and circuitry, too. Creating an incredibly fast car, however, is not a difficult task. The real secret behind this project is taking a close look at the specifications that include time penalties and bonuses to determine the best driving strategy. As with most engineering projects, we had to consider performance, reliability and costs. At each design stage, we considered factors such as: performance vs. reliability Performance vs. Costs And Reliability vs. Costs In order to develop the most cost-effective car.

    4. March 20, 2012 ENGR-1110 Team 12-A 4 Basic Concept

    5. March 20, 2012 ENGR-1110 Team 12-A 5 Driving Strategy

    6. March 20, 2012 ENGR-1110 Team 12-A 6 Driving Strategy REAR-WHEEL DRIVE: Drive: 1 motor ? rear-axle Steering: 1 motor ? rack & pinion Rectangular path on course 1st run: automated w/ manual backup 2nd and 3rd: fully automated

    7. March 20, 2012 ENGR-1110 Team 12-A 7 Mechanical Sub-system Rear wheel drive Tire traction Maintenance Construction JoeyJoey

    8. March 20, 2012 ENGR-1110 Team 12-A 8 Rear Wheel Drive Drive motor 1 motor connected to rear-axle Both drive wheels connected to rear axle Rack & pinion 1 motor connected to a linear rack Rack connected to pinion that pivots two steer wheels JoeyJoey

    9. March 20, 2012 ENGR-1110 Team 12-A 9 Rack and Pinion Close Up

    10. March 20, 2012 ENGR-1110 Team 12-A 10 Maximized Tire Traction Weight localized on each set of wheels Rubber radial tires Light-weight stranded wire JoeyJoey

    11. March 20, 2012 ENGR-1110 Team 12-A 11 Easy Maintenance Both motors easily removable Quick transformation from pivot-steer to rear-wheel-drive and vice versa Hooks at end of each wire and diode Quick changes to circuit design No soldering required No electric tape required JoeyJoey

    12. March 20, 2012 ENGR-1110 Team 12-A 12 Sturdy Construction LEGO friction pins Virtually impossible to break bricks apart Built-in tower to hold wire JoeyJoey

    13. March 20, 2012 ENGR-1110 Team 12-A 13 Close Up Shot 2

    14. March 20, 2012 ENGR-1110 Team 12-A 14 Front

    15. March 20, 2012 ENGR-1110 Team 12-A 15 Top

    16. March 20, 2012 ENGR-1110 Team 12-A 16 Electronic Sub-system Frequency and Waveform Programming Wiring Mustafa: During our design phase the e-sub underwent evolutionary changes. It started as a basic power unit for the car But by the end, a DirectX software that can learn the path around the track, and replay it down to the millisecond. Mustafa: During our design phase the e-sub underwent evolutionary changes. It started as a basic power unit for the car But by the end, a DirectX software that can learn the path around the track, and replay it down to the millisecond.

    17. March 20, 2012 ENGR-1110 Team 12-A 17 Frequency and Waveform 150 Hz frequency Square wave with positive duty cycles Circuit: 1 diode on drive channel 1 diode on steering channel Mustafa: Clint talked about the basic concept of the project, Where an audio amplifier raises the amplitude of the soundcard output to power the car Audio amplifiers have different gains at different frequencies And we found the optimal frequency using a graph of gain vs. frequency Included in our design report By connecting a diode between the amplifier and a multi-meter we found that a square wave with a 70/30 duty cycle provided the highest voltage. Mustafa: Clint talked about the basic concept of the project, Where an audio amplifier raises the amplitude of the soundcard output to power the car Audio amplifiers have different gains at different frequencies And we found the optimal frequency using a graph of gain vs. frequency Included in our design report By connecting a diode between the amplifier and a multi-meter we found that a square wave with a 70/30 duty cycle provided the highest voltage.

    18. March 20, 2012 ENGR-1110 Team 12-A 18 Programming Matlab to generate square wave .WAV Visual Basic for drive-by-wire driving Left channel: drive motor Right channel: rack-and-pinion motor Media source: Primary CDRW with backups Backup floppy disks MustafaMustafa

    19. March 20, 2012 ENGR-1110 Team 12-A 19 Wiring Requirements: low resistance / low friction Wiring simulation runtimes using PSpice MustafaMustafa

    20. March 20, 2012 ENGR-1110 Team 12-A 20 Materials and Costs Mandatory Supplies*: $57.25 LEGO parts: $20.42 Wire: $10.21 Total Expenditure: $87.88 * Mandatory Supplies: 2 motors, 2 sets of wheels and tires, 8 diodes

    21. March 20, 2012 ENGR-1110 Team 12-A 21 Reliability and Safety Redundant systems Multiple media sources Backup manual system if automation fails Insulated Wires Product not intended for children under the age of 10.

    22. March 20, 2012 ENGR-1110 Team 12-A 22 Testing and Competition Results Practice times (average) Setup Time: 15-25 seconds Automated: 0-50 seconds + setup Manual: 102 seconds + setup Actual time: Setup Time: 10-15 seconds Automated: N/A Manual: 78 seconds Final position in class: 5th

    23. March 20, 2012 ENGR-1110 Team 12-A 23 Issues During Competition Problem: Automation on 1st run not possible with new amplifier setting Solution: Manual recording saved Problem: A glitch in 2nd runs 4th turn resulted in too sharp a turn Solution: Corrected by delaying 4th turn by 1.5 seconds Problem: Setup error in 3rd run resulted in malfunction Solution: Need to be careful in future about procedures

    24. March 20, 2012 ENGR-1110 Team 12-A 24 Conclusion Car designed to meet user requirements First-ever rack & pinion implementation Drive-by-wire software Predictable performance due to extensive testing

More Related