P14007: Wheelchair Assist Final Presentation Che-An Lee Industrial - - PowerPoint PPT Presentation

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P14007: Wheelchair Assist Final Presentation Che-An Lee Industrial - - PowerPoint PPT Presentation

Dec 17, 2023 182 likes •319 views

P14007: Wheelchair Assist Final Presentation Che-An Lee Industrial and System Engineer Dan Schuster Mechanical Engineer Phil Medalie Mechanical Engineer Tom Elliot Electrical Engineer Sponsor: Multidisciplinary Senior Design

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P14007: Wheelchair Assist Final Presentation

Che-An Lee – Industrial and System Engineer Dan Schuster – Mechanical Engineer Phil Medalie – Mechanical Engineer Tom Elliot – Electrical Engineer Sponsor: Multidisciplinary Senior Design Program

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Agenda

 Project Description  Design Concept  System Architecture  Project Status  Test Results  Conclusion

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Project Description

 Design a low cost device that maintain the characteristic of a

manual wheelchair and prevent the wheelchair to roll back

 Key Customer Needs and Engineering Metrics:

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Design Concept

Pawl Brake Disk Bearing Block Ratchet Caliper

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Design Concept Cont.

Pawl Brake Disk Bearing Block Ratchet Caliper

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Design Concept Cont.

Left Wheel Generator Right Wheel Generator

Bridge Rectifier Bridge Rectifier

Buck-Boost Regulator

Circuit Breaker

USB Female Plug

Zener Diode

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Design Concept Cont.

  • 1. Left Generator Input Banana Clips
  • 2. Right Generator Input Banana Clips
  • 3. Both Bridge Rectifiers
  • 4. Circuit Breaker Switch
  • 5. Zener Diode
  • 6. Buck-Boost Regulator 5 Volts
  • 7. USB out with USB Circuitry.
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System Architecture

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Project Status

 Design meets all customer needs except:

 Weight (0.5 lbs over)  Charging system is not on the chair

 Unable to test:

 Maximum weight at 10 degree incline

 Completed BOM for working prototype  Completed all mechanical systems under budget

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Test Results

Specification Tested Target Value Result Max weight at 10 degree incline 400 lbf 260 lbf Time to disengage 2 sec 3.56 sec Time to engage 0.5 sec 0 sec

  • Max. incline angle

6 ° 13 °

  • Max. downhill speed

3 mph User Varied Time to disengage 2 sec 0 sec Time to engage 0.5 sec 0 sec Turning radius 1 ft. 0 ft Time to remove system 10 min 6 min Current output at 1mph 0.25 amps 0 amps Current output at 4mph 1 amps 1.04 amps Rollback distance 1 inch 0.25 inches Time (replacement) 15 min 9 min Input force 10 lbf 1.32 lbf System Weight 20 lb 20.5 lb Torque with 5 ohms resistive load 1 lbf 2.72 lbf Total System Cost (Purchased Parts) $500 $438 Wheelchair Width when folded 18 inches 17 inches Wheelchair Width 29 inches 25.5 inches Wheelchair Length 40 inches 38.5 inches

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Conclusion

Current Results:

 Demonstrated a cost

effective solution for rolling backwards

 Design maintains

important characteristics of a manual wheelchair

 Generator system

succeeded in charging a battery Future Work:

  • Weight reduction
  • Universally adaptable to

most manual wheelchairs

  • Incorporate movement

assist into design

  • More efficient generator

system to charge batteries at lower speeds

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Comments/Questions?