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

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

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

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

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

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

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

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

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

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

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

Gantt 11/21/2018

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 1830.51 11/21/2018

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

Questions 1/29/2015