p14007: wheelchair assitedge.rit.edu/edge/p14007/public/finaldocuments... · p14007: wheelchair...
TRANSCRIPT
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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 WheelGenerator
Bridge Rectifier
BridgeRectifier
Buck-Boost Regulator
Circuit Breaker
USB FemalePlug
ZenerDiode
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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?