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2013 GSDAA Finalist: Performing Fatigue Destructive Testing on Ankle-Foot Prostheses

2013 Life Sciences Finalist
Performing Fatigue Destructive Testing on Ankle-Foot Prostheses

Authors: Hung-Jen Lai, Chien-Hua Chen, Jain-Hong Lin, Wei-Kai Wang, Hsiao-Kuan Wu, and Chung-Huang Yu, TEH LIN PROSTHETIC & ORTHOPAEDIC INC., National Yang-Ming University

Challenge: Requiring ankle-foot prostheses under test to precisely follow a complex trajectory and loading profile while stepping on a tilting foot platform from heel-strike to toe-off, under the new ISO 22675 testing standard. In addition, the system needs to withstand a long repeated testing period while being flexible enough to adapt to different prostheses designs.

Solution: Using the NI sbRIO-9602 controller as the control platform while integrating NI 9215 and NI 9411 C Series modules to capture load cell and encoder signals. The FPGA on the NI Single-Board RIO controller was programmed for high-speed, precise, and synchronized motion control of the two servo motors, and a human machine interface (HMI) was programmed on the real-time OS to handle the trajectory generation and detect prosthesis failure.

Life Sciences - Prosthetics.jpg

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