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Group E Gyrobot Senior Design Project

This mid-term presentation from our senior design class discusses the Gyrobot project, focusing on design goals, strategies, hardware components, software implementation, and cost analysis. Our objectives include gaining hands-on experience, enhancing teamwork and communication skills, and efficiently designing a gyroscopic pendulum. We outline our hardware setup, including an encoder, motor, bearings, and cost breakdown. Challenges such as software interface problems with MATLAB and coordination issues during meetings are addressed. The project is currently facing delays due to unresolved interface issues but is ready for testing once resolved.

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Group E Gyrobot Senior Design Project

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  1. Group EGyrobot Senior Design Project Mid-Term Presentation October 30, 2002

  2. Group Members • Peter Love • Charly Hermanson • Andrew Rylander • Patricia Findley

  3. Overview • Project Goals • Design Strategy • Hardware • Cost Listing • Software • Web Page • Problems • Current Status

  4. Project Goals • To gain more experience with hands-on design • To enhance our ability to work well in a team environment • To become more efficient with communication skills • To design a gyroscopic pendulum

  5. Design Strategy • Separate the workload into hardware and software • Build the physical portion first to maximize our efficiency • Use two portions of coding for the software: balancing and swing-up

  6. Gantt Chart

  7. Hardware • Encoder • Motor • Shaft • Bearings • Arm • Flywheel • Custom Linkages

  8. Hardware Diagram

  9. Encoder • Manufacturer: US Digital • Specifications: • Optical quadrature • 1024 CPR • 5V DC (TTL) • Set screw disc mounting • .375 inch shaft • Cost: $55.19

  10. Encoder Theory

  11. Encoder Theory (cont’d) • 45 degree offset LED pairs generate pulses. • Pulses phases compared to each other to determine direction. • Counter incremented or decremented depending on direction. • Counter sampled into control system.

  12. Motor • Manufacturer: Pittman • Specifications: 9237S011 • 24V DC • 439.4 g • 81.2 m Nm of continuous torque • 544 m Nm peak torque • 500 CPR quadrature encoder • Cost: $148.04

  13. Shaft • Manufacturer: Custom (us) • ½ inch aluminum • Cost: $3.00 1 end machined to .375 inch for encoder 1 end threaded to allow arm mounting

  14. Bearings • Manufacturer: Dayton • Specifications: • Pillow block • Low friction • Ball bearings • Set screw collars • Cost: $20.64 (pair)

  15. Arm • Manufacturer: Custom (us) • Specifications: • ½ x 2 inch aluminum stock • Drilled for shaft • Bolt pattern to mount and countersink motor. • Cost: $7.00

  16. Flywheel • Manufacturer: Custom • Specifications • Brass • Set screw mounting • 5mm shaft mount • Cost: Free

  17. Cost Listing • Motor: $148.04 • Shaft: $ 3.00 • Bearings: $ 20.64 • Arm: $ 7.00 • Encoder: $ 55.19 • Flywheel: $ 0.00 TOTAL COST: $233.87

  18. Software • Interface: • ServoToGo via MATLAB • Controls: • Simulink • Completed: • Balancing algorithm

  19. Balancing Program • Theta 1 • Shaft Position • Theta 1 dot • Shaft Velocity • Theta 2 dot • Flywheel Velocity NOTE: May add integrating function for Theta 1 to avoid saturation

  20. Web Page • Based in FLASH 5.0 to incorporate media content • Filled with information and drawings

  21. Problems • The original shaft was made of hardened steel and was unable to be threaded • Coordinating meetings was difficult at times • Problems with Windows / MATLAB interface • Hardware problems with ServoToGo board

  22. Conclusion • The physical design and implementation of the gyrobot is complete • Current Status: The Windows/MATLAB interface problems have affected our progress with the software design • Next Step: Once the lab’s software issues are resolved, testing will begin

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