Introduction
As the Design Lead, I was responsible for developing multiple SolidWorks iterations to design a flexible exoskeleton that wraps around the hand while ensuring ergonomic comfort and mobility. I also designed a sturdy forearm gauntlet to securely house the electrical components, servo motors, and control system, optimizing both functionality and durability.
The initial concept for the exoskeleton hand wrap and forearm gauntlet stemmed from research on existing designs, identifying key features that enhance flexibility, comfort, and structural support. From our House of Quality, we cross-referenced customer requirements with engineering specifications to develop a well-balanced design. By integrating the best elements from multiple sources, I created a unique solution that optimizes both ergonomic adaptability and mechanical performance. This concept served as the foundation for the first CAD iteration, focusing on structural support and seamless component integration.
Building on the selected concept, I developed the first CAD iteration of the wrap-around brace and support rings in SolidWorks. This design focused on providing structural support while maintaining flexibility for natural hand movement. Key considerations included fitment, material thickness, and integration with the forearm gauntlet to ensure seamless assembly in later stages.
Following the initial brace design, I developed the first iteration of the forearm gauntlet in SolidWorks. This version was designed to house key electronic components, servo motors, and wiring while maintaining a secure and comfortable fit. However, during testing, we found that the sharp corners in the design compromised both comfort and safety. Additionally, the gauntlet did not properly fit the volunteer’s arm, highlighting the need for ergonomic adjustments in the next iteration.
Based on feedback from initial testing, I redesigned the wrap-around brace, rings, and ring caps to improve comfort, fitment, and structural integrity. The sharp corners from the previous iteration were rounded to enhance user comfort and safety. Additionally, I adjusted the dimensions of the rings and caps to ensure a more secure fit and seamless integration with the forearm gauntlet.
Once the final designs were completed, I 3D-printed the gauntlet, braces, rings, and caps to validate fitment and functionality. The parts were printed using [mention material if relevant, e.g., TPU for flexibility, PLA for rigidity], ensuring durability while maintaining lightweight properties. Each component was post-processed to remove printing artifacts and tested for proper assembly before integration.
To evaluate comfort, ease of use, and functionality, we conducted voluntary user testing with participants wearing the exoskeleton. A structured survey was formulated to collect feedback on fitment, mobility, and overall usability. Participants provided insights that highlighted minor areas for refinement, such as adjusting strap tension and improving overall comfort for extended wear.
Based on user testing feedback, we refined the assembly to enhance comfort, fitment, and ease of use. Adjustments were made to the strap tensioning system, component placement, and overall ergonomics to improve long-term wearability. An additional tubing assembly was integrated to guide the tensioning strings, ensuring consistent tension without causing misalignment in finger movement. The final prototype successfully combined mechanical and electronic components, demonstrating a fully functional and ergonomic exoskeleton design.
Reflection- Key Takeaways & Future Improvements
This project highlighted the importance of iterative design and user-driven refinement. User testing revealed critical adjustments, such as strap tensioning, tubing placement for tension control, and better weight distribution, leading to a more ergonomic and functional design.
Early design challenges, including sharp edges, improper string tension angles, and fitment issues, reinforced the value of real-world testing beyond theoretical modeling. Moving forward, improvements could focus on lighter materials, force sensor testing, and adaptive tensioning for enhanced usability.
This experience reinforced the need for continuous prototyping, interdisciplinary collaboration, and real-world validation in developing assistive wearable devices.