1. Solid State Prosthetic Arm
MAE 435: Status Update 1
Michael DiGiacomo Peter Dinga Joseph Flores Taylor Jones Shelby Nedrick

2. Project Objective
Solid State Fully Active Prosthetic Arm Two degrees of freedom Actuated by Shape Memory Alloys Under $2,000
Shelby: SMAs are smart materials whose material properties change because of thermo-mechanical influences; they contract when voltage is applied creating silent, fluid, life-like motion.
1/29/2015

3. Project Breakdown Figure 1: Structural Component
Figure 3: Electronic Circuit Board
Figure 2: Artificial Muscle Bundle
1/29/2015

4. Structural: Joint Testing
Deflection
Plastic Deformation
Figure 5: Joint Testing Setup -Plastic Deformation
Figure 4: Joint Testing Setup - Deflection
1/29/2015

5. Structural: New Design
Geometric Configuration
Number of Configurations
Kinematic Behavior
Ideal Geometric Configuration
Ideal Number of configurations
Figure 6: Second Design Joint Configurations
1/29/2015

6. Purpose 16 parallel wires Silicon Encased
Bundle Configuration
Purpose 16 parallel wires Silicon Encased
Figure 7: Muscle Bundle Wire Configuration
1/29/2015

7. Muscle Bundle New Mold Design New Endcap Fig 9 End Cap
Fig 8 Muscle Mold
Fig 11 Ring Terminal
Fig 10 End Cap Rev 1
1/29/2015

8. Data collection Cycling incorporated
Independent phase times explored
Load Cell and Laser Gauge sensitivities confirmed
Acknowledgement of possible stress influences
Caution must taken with load cell tests-stress can induce undesired deflections voiding the test
Fig 12 graphic data
1/29/2015

9. Electronics: Circuit diagram
Circuit used to heat SMAs
Single channel recreation
Based on previous design
Utilizes N-Type MOSFET transistor
Opening and closing the circuit
Actuates 1 SMA wire bundle
N-Type MOSFET
1/29/2015
Figure 13: New Circuit Diagram

10. Electronics: Circuit Prototype
Current prototype
Permanent, smaller configuration
Utilizes pushbutton control
Optimizing layout to avoid shorting
Power/ Ground
SMA Wire Attachment
N-Type MOSFET
Switch
Figure 14: Prototype Circuit
1/29/2015

11. Controls: Proposed Integration
Controls and Artificial Muscle
Incorporate C-DAQ with circuit
Compact Data Acquisition System
Allowing for PC control
Operating circuit and collecting data
Battery PC
Battery
Circuit
SMA
Structure
USB CDAQ
Circuit
SMA
Structure
Figure 15: Integration and Manual Control
Figure 16: Integration and Digital Control
1/29/2015

12. Gantt
11/21/2018

13. Budget Breakdown Subgroup Item Item Cost Shipping Purchased
Anticipated Order
Total
Structural Design
Rapid Prototyping -
Artificial Muscle
Drill Bits
109.7
11.46
Yes
121.16
Electronics & Controls
MOSFET
28.14
Mini Pushbutton Switch
3.20 9
12.20
Team Supplies
Presentation Board
7.99
Total Spent
169.49
Budget Remaining
11/21/2018

14. Summary Items completed New Joint Designs End Caps/ First Muscle Mold
Permanent Circuit
Currently in the process of
Printing Joints
Improving Bundle Fabrication
On Track for
First Component Prototypes- End of the Month
Budget Analysis
Under budget
11/21/2018

15. Questions
1/29/2015